Home > Products > Valid Products > AFD

000
FXUS66 KPDT 200550
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
944 PM PST FRI DEC 19 2014

.SHORT TERM...WARM FRONTAL CLOUDS OVERSPREADING THE REGION THIS
EVENING. EXPECT RAIN WILL DEVELOP LATER TONIGHT. ALL MODELS CONTINUE
TO SHOW RAIN SATURDAY AS THE WARM FRONT MOVES ACROSS THE FORECAST
AREA. SHOULD SEE SOME MODERATE RAIN AT TIMES. QPF AMOUNTS ARE FAIRLY
SIGNIFICANT GIVEN THE HIGH PRECIPITABLE WATER VALUES. SNOW LEVELS
WILL QUICKLY RISE TOMORROW AS THE REGION GETS INTO THE WARM SECTOR.
PRESSURE GRADIENTS WILL BE INCREASING SATURDAY ALONG WITH THE WINDS
ALOFT. THIS WILL BRING INCREASING WINDS DURING THE DAY WITH MOST
LOCATIONS BECOMING BREEZY TO WINDY BY AFTERNOON. TEMPERATURES WILL
BE MOSTLY IN THE 40S. RAIN WILL CONTINUE SATURDAY NIGHT ALTHOUGH IT
WILL START TO BECOME MORE CONFINED TO THE CASCADES AND NORTHEAST
OREGON MOUNTAINS TOWARD MORNING WITH THE WESTERLY FLOW ALOFT
INCREASING. SATURDAY NIGHT INTO SUNDAY MORNING WILL BE THE PERIOD OF
STRONGEST WINDS ALOFT AND WILL LIKELY CORRESPOND TO THE STRONGEST
SURFACE WINDS AND HIGHEST WIND GUSTS. WESTERLY FLOW ALOFT WILL KEEP
THE HEAVIER RAIN GOING OVER THE CASCADES AND NORTHEAST OREGON
MOUNTAINS SUNDAY. MODELS INDICATE STORM TOTAL RAINFALL OF 3-7 INCHES
POSSIBLE ALONG THE CASCADE CREST, 2-5 INCHES ALONG THE EAST SLOPES,
2-4 INCHES NORTHEAST OREGON MOUNTAINS. FLOOD WATCHES IN EFFECT AS
MOST RIVERS AND STREAMS WILL HAVE SHARP RISES OVER THE NEXT FEW DAYS.
94

.AVIATION...06Z TAFS. CEILINGS WILL BE LOWERING OVERNIGHT WITH RAIN
DEVELOPING AS A WARM FRONT MOVES INTO THE REGION. MVFR CONDITIONS
LIKELY SATURDAY WITH STEADY RAIN. WINDS 5-10KT TONIGHT INCREASING
SATURDAY ESPECIALLY IN THE AFTERNOON AND EVENING.

&&

.PREV DISC... /ISSUED 410 PM PST FRI DEC 19 2014/

SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH RISING SNOW LEVELS
SATURDAY NIGHT AND SUNDAY RESULTING IN COPIOUS AMOUNTS OF RAIN
FALLING ON THE SNOWPACK IN THE MOUNTAINS. SURFACE TEMPERATURES WILL
ALSO REMAIN ABOVE FREEZING IN MUCH OF THE MOUNTAINS SATURDAY NIGHT
THROUGH SUNDAY NIGHT RESULTING IN RUNOFF FROM SNOWMELT AND RAINFALL.
AS SUCH AREA RIVERS, STREAMS AND CREEKS WILL RISE TO OR ABOVE
BANKFULL IN SOME AREAS. AT A MINIMUM 1.00-1.50 INCHES OF RAIN ARE
EXPECTED IN THE BLUE MOUNTAINS AND THE WALLOWA MOUNTAINS FOR THE 36
HOUR PERIOD FROM SUNDOWN ON SATURDAY AFTERNOON TO SUNUP ON MONDAY.
LOWER ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.20 OF AN INCH
TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT THROUGH SUNDAY NIGHT. SNOW
LEVELS RISE TO AROUND 6000-8000 BY DAYBREAK ON SUNDAY WITH THE LOWER
SNOW LEVELS IN THE WASHINGTON CASCADES. SNOW LEVELS WILL REMAIN HIGH
ON SUNDAY, AROUND 6000 FEET ALONG THE EAST SLOPES OF THE WASHINGTON
CASCADES AND RISING TO 7500-8500 FEET IN CENTRAL AND NORTHEAST
OREGON WHILE THE WARM FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS
LOWER TO 4500-5500 FEET SUNDAY NIGHT ALONG THE EAST SLOPES OF THE
WASHINGTON CASCADES AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN
CENTRAL AND NORTHEAST OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE
BUILDS OVER THE REGION MONDAY AND MONDAY NIGHT FOR SINKING AIR
YIELDING MAINLY DRY CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL
KEEP A LOW CHANCE OF PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  49  47  56 /  20  90  90  80
ALW  37  50  45  56 /  20  90 100  90
PSC  36  48  43  55 /  20  90  80  40
YKM  34  41  36  49 /  20  90  80  40
HRI  35  49  44  58 /  20  90  80  50
ELN  31  39  34  46 /  20  90 100  60
RDM  34  49  42  55 /  60  90  80  70
LGD  34  45  40  51 /  20  90 100 100
GCD  34  48  42  51 /  30  90 100  80
DLS  35  45  44  54 /  60  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY UNTIL 4 PM PST SATURDAY FOR WESTERN
     KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94/







000
FXUS66 KPDT 200550
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
944 PM PST FRI DEC 19 2014

.SHORT TERM...WARM FRONTAL CLOUDS OVERSPREADING THE REGION THIS
EVENING. EXPECT RAIN WILL DEVELOP LATER TONIGHT. ALL MODELS CONTINUE
TO SHOW RAIN SATURDAY AS THE WARM FRONT MOVES ACROSS THE FORECAST
AREA. SHOULD SEE SOME MODERATE RAIN AT TIMES. QPF AMOUNTS ARE FAIRLY
SIGNIFICANT GIVEN THE HIGH PRECIPITABLE WATER VALUES. SNOW LEVELS
WILL QUICKLY RISE TOMORROW AS THE REGION GETS INTO THE WARM SECTOR.
PRESSURE GRADIENTS WILL BE INCREASING SATURDAY ALONG WITH THE WINDS
ALOFT. THIS WILL BRING INCREASING WINDS DURING THE DAY WITH MOST
LOCATIONS BECOMING BREEZY TO WINDY BY AFTERNOON. TEMPERATURES WILL
BE MOSTLY IN THE 40S. RAIN WILL CONTINUE SATURDAY NIGHT ALTHOUGH IT
WILL START TO BECOME MORE CONFINED TO THE CASCADES AND NORTHEAST
OREGON MOUNTAINS TOWARD MORNING WITH THE WESTERLY FLOW ALOFT
INCREASING. SATURDAY NIGHT INTO SUNDAY MORNING WILL BE THE PERIOD OF
STRONGEST WINDS ALOFT AND WILL LIKELY CORRESPOND TO THE STRONGEST
SURFACE WINDS AND HIGHEST WIND GUSTS. WESTERLY FLOW ALOFT WILL KEEP
THE HEAVIER RAIN GOING OVER THE CASCADES AND NORTHEAST OREGON
MOUNTAINS SUNDAY. MODELS INDICATE STORM TOTAL RAINFALL OF 3-7 INCHES
POSSIBLE ALONG THE CASCADE CREST, 2-5 INCHES ALONG THE EAST SLOPES,
2-4 INCHES NORTHEAST OREGON MOUNTAINS. FLOOD WATCHES IN EFFECT AS
MOST RIVERS AND STREAMS WILL HAVE SHARP RISES OVER THE NEXT FEW DAYS.
94

.AVIATION...06Z TAFS. CEILINGS WILL BE LOWERING OVERNIGHT WITH RAIN
DEVELOPING AS A WARM FRONT MOVES INTO THE REGION. MVFR CONDITIONS
LIKELY SATURDAY WITH STEADY RAIN. WINDS 5-10KT TONIGHT INCREASING
SATURDAY ESPECIALLY IN THE AFTERNOON AND EVENING.

&&

.PREV DISC... /ISSUED 410 PM PST FRI DEC 19 2014/

SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH RISING SNOW LEVELS
SATURDAY NIGHT AND SUNDAY RESULTING IN COPIOUS AMOUNTS OF RAIN
FALLING ON THE SNOWPACK IN THE MOUNTAINS. SURFACE TEMPERATURES WILL
ALSO REMAIN ABOVE FREEZING IN MUCH OF THE MOUNTAINS SATURDAY NIGHT
THROUGH SUNDAY NIGHT RESULTING IN RUNOFF FROM SNOWMELT AND RAINFALL.
AS SUCH AREA RIVERS, STREAMS AND CREEKS WILL RISE TO OR ABOVE
BANKFULL IN SOME AREAS. AT A MINIMUM 1.00-1.50 INCHES OF RAIN ARE
EXPECTED IN THE BLUE MOUNTAINS AND THE WALLOWA MOUNTAINS FOR THE 36
HOUR PERIOD FROM SUNDOWN ON SATURDAY AFTERNOON TO SUNUP ON MONDAY.
LOWER ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.20 OF AN INCH
TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT THROUGH SUNDAY NIGHT. SNOW
LEVELS RISE TO AROUND 6000-8000 BY DAYBREAK ON SUNDAY WITH THE LOWER
SNOW LEVELS IN THE WASHINGTON CASCADES. SNOW LEVELS WILL REMAIN HIGH
ON SUNDAY, AROUND 6000 FEET ALONG THE EAST SLOPES OF THE WASHINGTON
CASCADES AND RISING TO 7500-8500 FEET IN CENTRAL AND NORTHEAST
OREGON WHILE THE WARM FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS
LOWER TO 4500-5500 FEET SUNDAY NIGHT ALONG THE EAST SLOPES OF THE
WASHINGTON CASCADES AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN
CENTRAL AND NORTHEAST OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE
BUILDS OVER THE REGION MONDAY AND MONDAY NIGHT FOR SINKING AIR
YIELDING MAINLY DRY CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL
KEEP A LOW CHANCE OF PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  49  47  56 /  20  90  90  80
ALW  37  50  45  56 /  20  90 100  90
PSC  36  48  43  55 /  20  90  80  40
YKM  34  41  36  49 /  20  90  80  40
HRI  35  49  44  58 /  20  90  80  50
ELN  31  39  34  46 /  20  90 100  60
RDM  34  49  42  55 /  60  90  80  70
LGD  34  45  40  51 /  20  90 100 100
GCD  34  48  42  51 /  30  90 100  80
DLS  35  45  44  54 /  60  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY UNTIL 4 PM PST SATURDAY FOR WESTERN
     KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94/








000
FXUS66 KPDT 200428
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
822 PM PST FRI DEC 19 2014

.SHORT TERM...WARM FRONTAL CLOUDS OVERSPREADING THE REGION THIS
EVENING. EXPECT RAIN WILL DEVELOP LATER TONIGHT. ALL MODELS CONTINUE
TO SHOW RAIN SATURDAY AS THE WARM FRONT MOVES ACROSS THE FORECAST
AREA. SHOULD SEE SOME MODERATE RAIN AT TIMES. QPF AMOUNTS ARE FAIRLY
SIGNIFICANT GIVEN THE HIGH PRECIPITABLE WATER VALUES. SNOW LEVELS
WILL QUICKLY RISE TOMORROW AS THE REGION GETS INTO THE WARM SECTOR.
PRESSURE GRADIENTS WILL BE INCREASING SATURDAY ALONG WITH THE WINDS
ALOFT. THIS WILL BRING INCREASING WINDS DURING THE DAY WITH MOST
LOCATIONS BECOMING BREEZY TO WINDY BY AFTERNOON. TEMPERATURES WILL
BE MOSTLY IN THE 40S. RAIN WILL CONTINUE SATURDAY NIGHT ALTHOUGH IT
WILL START TO BECOME MORE CONFINED TO THE CASCADES AND NORTHEAST
OREGON MOUNTAINS TOWARD MORNING WITH THE WESTERLY FLOW ALOFT
INCREASING. SATURDAY NIGHT INTO SUNDAY MORNING WILL BE THE PERIOD OF
STRONGEST WINDS ALOFT AND WILL LIKELY CORRESPOND TO THE STRONGEST
SURFACE WINDS AND HIGHEST WIND GUSTS. WESTERLY FLOW ALOFT WILL KEEP
THE HEAVIER RAIN GOING OVER THE CASCADES AND NORTHEAST OREGON
MOUNTAINS SUNDAY. MODELS INDICATE STORM TOTAL RAINFALL OF 3-7 INCHES
POSSIBLE ALONG THE CASCADE CREST, 2-5 INCHES ALONG THE EAST SLOPES,
2-4 INCHES NORTHEAST OREGON MOUNTAINS. FLOOD WATCHES IN EFFECT AS
MOST RIVERS AND STREAMS WILL HAVE SHARP RISES OVER THE NEXT FEW DAYS. 94

&&

.PREV DISC... /ISSUED 410 PM PST FRI DEC 19 2014/

SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH RISING SNOW LEVELS
SATURDAY NIGHT AND SUNDAY RESULTING IN COPIOUS AMOUNTS OF RAIN
FALLING ON THE SNOWPACK IN THE MOUNTAINS. SURFACE TEMPERATURES WILL
ALSO REMAIN ABOVE FREEZING IN MUCH OF THE MOUNTAINS SATURDAY NIGHT
THROUGH SUNDAY NIGHT RESULTING IN RUNOFF FROM SNOWMELT AND RAINFALL.
AS SUCH AREA RIVERS, STREAMS AND CREEKS WILL RISE TO OR ABOVE
BANKFULL IN SOME AREAS. AT A MINIMUM 1.00-1.50 INCHES OF RAIN ARE
EXPECTED IN THE BLUE MOUNTAINS AND THE WALLOWA MOUNTAINS FOR THE 36
HOUR PERIOD FROM SUNDOWN ON SATURDAY AFTERNOON TO SUNUP ON MONDAY.
LOWER ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.20 OF AN INCH
TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT THROUGH SUNDAY NIGHT. SNOW
LEVELS RISE TO AROUND 6000-8000 BY DAYBREAK ON SUNDAY WITH THE LOWER
SNOW LEVELS IN THE WASHINGTON CASCADES. SNOW LEVELS WILL REMAIN HIGH
ON SUNDAY, AROUND 6000 FEET ALONG THE EAST SLOPES OF THE WASHINGTON
CASCADES AND RISING TO 7500-8500 FEET IN CENTRAL AND NORTHEAST
OREGON WHILE THE WARM FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS
LOWER TO 4500-5500 FEET SUNDAY NIGHT ALONG THE EAST SLOPES OF THE
WASHINGTON CASCADES AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN
CENTRAL AND NORTHEAST OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE
BUILDS OVER THE REGION MONDAY AND MONDAY NIGHT FOR SINKING AIR
YIELDING MAINLY DRY CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL
KEEP A LOW CHANCE OF PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

AVIATION...00Z TAFS...A FAST MOVING COLD FRONT EXITED INTO IDAHO
LATE THIS AFTERNOON WITH IMPROVING CONDITIONS IN ITS WAKE.

VFR CONDITIONS ARE EXPECTED FOR THE REMAINDER OF THIS AFTERNOON INTO
THIS EVENING, EXCEPT AT KYKM WHERE IFR WILL PREVAIL DUE TO LOW CIGS.
KRDM AND KBDN WILL HAVE MVFR CIGS TONIGHT BEGINNING AROUND 05Z/20TH.
A WARM FRONT WILL BRING RAIN AT LOWER ELEVATIONS AND SNOW IN THE
MOUNTAINS ABOVE 4000 FEET TONIGHT. RAIN BEGINS AT KDLS, KRDM, AND
KBDN AROUND 05Z/20TH AND AT KYKM AT 07Z/20TH RAIN WILL SPREAD EAST
TO KPDT AND KALW BY 09Z/20TH AN ARRIVE AT KPSC BY 11Z/20TH.  POLAN

HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  49  47  56 /  20  90  90  80
ALW  37  50  45  56 /  20  90 100  90
PSC  36  48  43  55 /  20  90  80  40
YKM  34  41  36  49 /  20  90  80  40
HRI  35  49  44  58 /  20  90  80  50
ELN  31  39  34  46 /  20  90 100  60
RDM  34  49  42  55 /  60  90  80  70
LGD  34  45  40  51 /  20  90 100 100
GCD  34  48  42  51 /  30  90 100  80
DLS  35  45  44  54 /  60  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY UNTIL 4 PM PST SATURDAY FOR WESTERN
     KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94/






000
FXUS66 KPDT 200428
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
822 PM PST FRI DEC 19 2014

.SHORT TERM...WARM FRONTAL CLOUDS OVERSPREADING THE REGION THIS
EVENING. EXPECT RAIN WILL DEVELOP LATER TONIGHT. ALL MODELS CONTINUE
TO SHOW RAIN SATURDAY AS THE WARM FRONT MOVES ACROSS THE FORECAST
AREA. SHOULD SEE SOME MODERATE RAIN AT TIMES. QPF AMOUNTS ARE FAIRLY
SIGNIFICANT GIVEN THE HIGH PRECIPITABLE WATER VALUES. SNOW LEVELS
WILL QUICKLY RISE TOMORROW AS THE REGION GETS INTO THE WARM SECTOR.
PRESSURE GRADIENTS WILL BE INCREASING SATURDAY ALONG WITH THE WINDS
ALOFT. THIS WILL BRING INCREASING WINDS DURING THE DAY WITH MOST
LOCATIONS BECOMING BREEZY TO WINDY BY AFTERNOON. TEMPERATURES WILL
BE MOSTLY IN THE 40S. RAIN WILL CONTINUE SATURDAY NIGHT ALTHOUGH IT
WILL START TO BECOME MORE CONFINED TO THE CASCADES AND NORTHEAST
OREGON MOUNTAINS TOWARD MORNING WITH THE WESTERLY FLOW ALOFT
INCREASING. SATURDAY NIGHT INTO SUNDAY MORNING WILL BE THE PERIOD OF
STRONGEST WINDS ALOFT AND WILL LIKELY CORRESPOND TO THE STRONGEST
SURFACE WINDS AND HIGHEST WIND GUSTS. WESTERLY FLOW ALOFT WILL KEEP
THE HEAVIER RAIN GOING OVER THE CASCADES AND NORTHEAST OREGON
MOUNTAINS SUNDAY. MODELS INDICATE STORM TOTAL RAINFALL OF 3-7 INCHES
POSSIBLE ALONG THE CASCADE CREST, 2-5 INCHES ALONG THE EAST SLOPES,
2-4 INCHES NORTHEAST OREGON MOUNTAINS. FLOOD WATCHES IN EFFECT AS
MOST RIVERS AND STREAMS WILL HAVE SHARP RISES OVER THE NEXT FEW DAYS. 94

&&

.PREV DISC... /ISSUED 410 PM PST FRI DEC 19 2014/

SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH RISING SNOW LEVELS
SATURDAY NIGHT AND SUNDAY RESULTING IN COPIOUS AMOUNTS OF RAIN
FALLING ON THE SNOWPACK IN THE MOUNTAINS. SURFACE TEMPERATURES WILL
ALSO REMAIN ABOVE FREEZING IN MUCH OF THE MOUNTAINS SATURDAY NIGHT
THROUGH SUNDAY NIGHT RESULTING IN RUNOFF FROM SNOWMELT AND RAINFALL.
AS SUCH AREA RIVERS, STREAMS AND CREEKS WILL RISE TO OR ABOVE
BANKFULL IN SOME AREAS. AT A MINIMUM 1.00-1.50 INCHES OF RAIN ARE
EXPECTED IN THE BLUE MOUNTAINS AND THE WALLOWA MOUNTAINS FOR THE 36
HOUR PERIOD FROM SUNDOWN ON SATURDAY AFTERNOON TO SUNUP ON MONDAY.
LOWER ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.20 OF AN INCH
TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT THROUGH SUNDAY NIGHT. SNOW
LEVELS RISE TO AROUND 6000-8000 BY DAYBREAK ON SUNDAY WITH THE LOWER
SNOW LEVELS IN THE WASHINGTON CASCADES. SNOW LEVELS WILL REMAIN HIGH
ON SUNDAY, AROUND 6000 FEET ALONG THE EAST SLOPES OF THE WASHINGTON
CASCADES AND RISING TO 7500-8500 FEET IN CENTRAL AND NORTHEAST
OREGON WHILE THE WARM FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS
LOWER TO 4500-5500 FEET SUNDAY NIGHT ALONG THE EAST SLOPES OF THE
WASHINGTON CASCADES AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN
CENTRAL AND NORTHEAST OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE
BUILDS OVER THE REGION MONDAY AND MONDAY NIGHT FOR SINKING AIR
YIELDING MAINLY DRY CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL
KEEP A LOW CHANCE OF PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

AVIATION...00Z TAFS...A FAST MOVING COLD FRONT EXITED INTO IDAHO
LATE THIS AFTERNOON WITH IMPROVING CONDITIONS IN ITS WAKE.

VFR CONDITIONS ARE EXPECTED FOR THE REMAINDER OF THIS AFTERNOON INTO
THIS EVENING, EXCEPT AT KYKM WHERE IFR WILL PREVAIL DUE TO LOW CIGS.
KRDM AND KBDN WILL HAVE MVFR CIGS TONIGHT BEGINNING AROUND 05Z/20TH.
A WARM FRONT WILL BRING RAIN AT LOWER ELEVATIONS AND SNOW IN THE
MOUNTAINS ABOVE 4000 FEET TONIGHT. RAIN BEGINS AT KDLS, KRDM, AND
KBDN AROUND 05Z/20TH AND AT KYKM AT 07Z/20TH RAIN WILL SPREAD EAST
TO KPDT AND KALW BY 09Z/20TH AN ARRIVE AT KPSC BY 11Z/20TH.  POLAN

HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  49  47  56 /  20  90  90  80
ALW  37  50  45  56 /  20  90 100  90
PSC  36  48  43  55 /  20  90  80  40
YKM  34  41  36  49 /  20  90  80  40
HRI  35  49  44  58 /  20  90  80  50
ELN  31  39  34  46 /  20  90 100  60
RDM  34  49  42  55 /  60  90  80  70
LGD  34  45  40  51 /  20  90 100 100
GCD  34  48  42  51 /  30  90 100  80
DLS  35  45  44  54 /  60  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY UNTIL 4 PM PST SATURDAY FOR WESTERN
     KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94/







000
FXUS66 KPDT 200015 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
410 PM PST FRI DEC 19 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

.LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH RISING SNOW LEVELS
SATURDAY NIGHT AND SUNDAY RESULTING IN COPIOUS AMOUNTS OF RAIN
FALLING ON THE SNOWPACK IN THE MOUNTAINS. SURFACE TEMPERATURES WILL
ALSO REMAIN ABOVE FREEZING IN MUCH OF THE MOUNTAINS SATURDAY NIGHT
THROUGH SUNDAY NIGHT RESULTING IN RUNOFF FROM SNOWMELT AND RAINFALL.
AS SUCH AREA RIVERS, STREAMS AND CREEKS WILL RISE TO OR ABOVE
BANKFULL IN SOME AREAS. AT A MINIMUM 1.00-1.50 INCHES OF RAIN ARE
EXPECTED IN THE BLUE MOUNTAINS AND THE WALLOWA MOUNTAINS FOR THE 36
HOUR PERIOD FROM SUNDOWN ON SATURDAY AFTERNOON TO SUNUP ON MONDAY.
LOWER ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.20 OF AN INCH
TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT THROUGH SUNDAY NIGHT. SNOW
LEVELS RISE TO AROUND 6000-8000 BY DAYBREAK ON SUNDAY WITH THE LOWER
SNOW LEVELS IN THE WASHINGTON CASCADES. SNOW LEVELS WILL REMAIN HIGH
ON SUNDAY, AROUND 6000 FEET ALONG THE EAST SLOPES OF THE WASHINGTON
CASCADES AND RISING TO 7500-8500 FEET IN CENTRAL AND NORTHEAST
OREGON WHILE THE WARM FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS
LOWER TO 4500-5500 FEET SUNDAY NIGHT ALONG THE EAST SLOPES OF THE
WASHINGTON CASCADES AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN
CENTRAL AND NORTHEAST OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE
BUILDS OVER THE REGION MONDAY AND MONDAY NIGHT FOR SINKING AIR
YIELDING MAINLY DRY CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL
KEEP A LOW CHANCE OF PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

&&

.AVIATION...00Z TAFS...A FAST MOVING COLD FRONT EXITED INTO IDAHO
LATE THIS AFTERNOON WITH IMPROVING CONDITIONS IN ITS WAKE.

VFR CONDITIONS ARE EXPECTED FOR THE REMAINDER OF THIS AFTERNOON INTO
THIS EVENING, EXCEPT AT KYKM WHERE IFR WILL PREVAIL DUE TO LOW CIGS.
KRDM AND KBDN WILL HAVE MVFR CIGS TONIGHT BEGINNING AROUND 05Z/20TH.
A WARM FRONT WILL BRING RAIN AT LOWER ELEVATIONS AND SNOW IN THE
MOUNTAINS ABOVE 4000 FEET TONIGHT. RAIN BEGINS AT KDLS, KRDM, AND
KBDN AROUND 05Z/20TH AND AT KYKM AT 07Z/20TH RAIN WILL SPREAD EAST
TO KPDT AND KALW BY 09Z/20TH AN ARRIVE AT KPSC BY 11Z/20TH.  POLAN

&&

.HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  49  47  56 /  20  80  90  80
ALW  39  50  45  56 /  20  80 100  90
PSC  37  48  43  55 /  20  80  80  40
YKM  35  41  36  49 /  20  80  80  40
HRI  36  49  44  58 /  20  80  80  50
ELN  32  39  34  46 /  20  90 100  60
RDM  35  49  42  55 /  50  80  80  70
LGD  35  45  40  51 /  20  90 100 100
GCD  35  48  42  51 /  20  80 100  80
DLS  36  45  44  54 /  40  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 4 PM PST
     SATURDAY FOR WESTERN KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/89/99







000
FXUS66 KPDT 192256 CCA
AFDPDT

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
248 PM PST FRI DEC 19 2014

.SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

.LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH DRAMATICALLY RISING
SNOW LEVELS DURING THE DAY ON SATURDAY NIGHT AND SUNDAY RESULTING IN
COPIOUS AMOUNTS OF RAIN FALLING ON THE SNOWPACK IN THE MOUNTAINS.
TEMPERATURES WILL ALSO REMAIN ABOVE FREEZING IN MUCH OF THE
MOUNTAINS SATURDAY NIGHT AND SUNDAY NIGHT RESULTING IN SNOWMELT AND
RUNOFF FROM SNOWMELT AND THE RAIN. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
1.00-1.50 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS AND THE
WALLOWA MOUNTAINS FOR THE 36 HOUR PERIOD FROM SUNDOWN ON SATURDAY
AFTERNOON THROUGH SUNUP ON MONDAY. LOWER ELEVATIONS CAN EXPECT TO
RECEIVE ANYWHERE FROM 0.20 TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT
THROUGH SUNDAY NIGHT. SNOW LEVELS RISE TO AROUND 6000-8000 BY
DAYBREAK ON SUNDAY WITH THE LOWER SNOW LEVELS IN THE WASHINGTON
CASCADES. SNOW LEVELS WILL REMAIN HIGH ON SUNDAY, AROUND 6000 FEET
ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES AND RISE TO
7500-8500 FEET IN THE CENTRAL AND NORTHEAST OREGON WHILE THE WARM
FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS LOWER TO 4500-5500
FEET ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES SUNDAY NIGHT
AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN CENTRAL AND NORTHEAST
OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE BUILDS OVER THE REGION
MONDAY AND MONDAY NIGHT FOR SINKING AIR YIELDING MAINLY DRY
CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL KEEP A LOW CHANCE OF
PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

&&

.PREVIOUS AVIATION DISCUSSION...18Z TAFS...A COLD FRONT IS MOVING
ACROSS THE LOWER COLUMBIA BASIN THIS MORNING WITH KPDT RADAR SHOWING
RAIN AHEAD OF THE FRONT ALONG THE FOOTHILLS OF THE NORTHERN BLUE
MOUNTAINS AND -RA AT KPDT AND KALW, WHICH SHOULD END BY 20Z. AREAS
OF MVFR/IFR CIGS/VSBY IN FOG AND LOW STRATUS ARE EXPECTED FOR
REMAINDER OF THIS MORNING WITH SOME IMPROVEMENT AFTER 20Z TO VFR.
HOWEVER, KYKM IS EXPECTED TO REMAIN MVFR/IFR THROUGH THIS AFTERNOON.
AFTER 03Z/20TH EXPECT CIGS TO LOWER  TO MVFR/IFR WITH SOME FOG
THROUGH OVERNIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING.
POLAN

&&

.HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  49  47  56 /  20  80  90  80
ALW  39  50  45  56 /  20  80 100  90
PSC  37  48  43  55 /  20  80  80  40
YKM  35  41  36  49 /  20  80  80  40
HRI  36  49  44  58 /  20  80  80  50
ELN  32  39  34  46 /  20  90 100  60
RDM  35  49  42  55 /  50  80  80  70
LGD  35  45  40  51 /  20  90 100 100
GCD  35  48  42  51 /  20  80 100  80
DLS  36  45  44  54 /  40  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 4 PM PST
     SATURDAY FOR WESTERN KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/89/99














000
FXUS66 KPDT 192256 CCA
AFDPDT

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
248 PM PST FRI DEC 19 2014

.SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

.LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH DRAMATICALLY RISING
SNOW LEVELS DURING THE DAY ON SATURDAY NIGHT AND SUNDAY RESULTING IN
COPIOUS AMOUNTS OF RAIN FALLING ON THE SNOWPACK IN THE MOUNTAINS.
TEMPERATURES WILL ALSO REMAIN ABOVE FREEZING IN MUCH OF THE
MOUNTAINS SATURDAY NIGHT AND SUNDAY NIGHT RESULTING IN SNOWMELT AND
RUNOFF FROM SNOWMELT AND THE RAIN. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
1.00-1.50 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS AND THE
WALLOWA MOUNTAINS FOR THE 36 HOUR PERIOD FROM SUNDOWN ON SATURDAY
AFTERNOON THROUGH SUNUP ON MONDAY. LOWER ELEVATIONS CAN EXPECT TO
RECEIVE ANYWHERE FROM 0.20 TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT
THROUGH SUNDAY NIGHT. SNOW LEVELS RISE TO AROUND 6000-8000 BY
DAYBREAK ON SUNDAY WITH THE LOWER SNOW LEVELS IN THE WASHINGTON
CASCADES. SNOW LEVELS WILL REMAIN HIGH ON SUNDAY, AROUND 6000 FEET
ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES AND RISE TO
7500-8500 FEET IN THE CENTRAL AND NORTHEAST OREGON WHILE THE WARM
FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS LOWER TO 4500-5500
FEET ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES SUNDAY NIGHT
AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN CENTRAL AND NORTHEAST
OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE BUILDS OVER THE REGION
MONDAY AND MONDAY NIGHT FOR SINKING AIR YIELDING MAINLY DRY
CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL KEEP A LOW CHANCE OF
PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

&&

.PREVIOUS AVIATION DISCUSSION...18Z TAFS...A COLD FRONT IS MOVING
ACROSS THE LOWER COLUMBIA BASIN THIS MORNING WITH KPDT RADAR SHOWING
RAIN AHEAD OF THE FRONT ALONG THE FOOTHILLS OF THE NORTHERN BLUE
MOUNTAINS AND -RA AT KPDT AND KALW, WHICH SHOULD END BY 20Z. AREAS
OF MVFR/IFR CIGS/VSBY IN FOG AND LOW STRATUS ARE EXPECTED FOR
REMAINDER OF THIS MORNING WITH SOME IMPROVEMENT AFTER 20Z TO VFR.
HOWEVER, KYKM IS EXPECTED TO REMAIN MVFR/IFR THROUGH THIS AFTERNOON.
AFTER 03Z/20TH EXPECT CIGS TO LOWER  TO MVFR/IFR WITH SOME FOG
THROUGH OVERNIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING.
POLAN

&&

.HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  49  47  56 /  20  80  90  80
ALW  39  50  45  56 /  20  80 100  90
PSC  37  48  43  55 /  20  80  80  40
YKM  35  41  36  49 /  20  80  80  40
HRI  36  49  44  58 /  20  80  80  50
ELN  32  39  34  46 /  20  90 100  60
RDM  35  49  42  55 /  50  80  80  70
LGD  35  45  40  51 /  20  90 100 100
GCD  35  48  42  51 /  20  80 100  80
DLS  36  45  44  54 /  40  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 4 PM PST
     SATURDAY FOR WESTERN KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/89/99















000
FXUS66 KPDT 192249
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
248 PM PST FRI DEC 19 2014

.SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

.LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH DRAMATICALLY RISING
SNOW LEVELS DURING THE DAY ON SATURDAY NIGHT AND SUNDAY RESULTING IN
COPIOUS AMOUNTS OF RAIN FALLING ON THE SNOWPACK IN THE MOUNTAINS.
TEMPERATURES WILL ALSO REMAIN ABOVE FREEZING IN MUCH OF THE
MOUNTAINS SATURDAY NIGHT AND SUNDAY NIGHT RESULTING IN SNOWMELT AND
RUNOFF FROM SNOWMELT AND THE RAIN. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
1.00-1.50 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS AND THE
WALLOWA MOUNTAINS FOR THE 36 HOUR PERIOD FROM SUNDOWN ON SATURDAY
AFTERNOON THROUGH SUNUP ON MONDAY. LOWER ELEVATIONS CAN EXPECT TO
RECEIVE ANYWHERE FROM 0.20 TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT
THROUGH SUNDAY NIGHT. SNOW LEVELS RISE TO AROUND 6000-8000 BY
DAYBREAK ON SUNDAY WITH THE LOWER SNOW LEVELS IN THE WASHINGTON
CASCADES. SNOW LEVELS WILL REMAIN HIGH ON SUNDAY, AROUND 6000 FEET
ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES AND RISE TO
7500-8500 FEET IN THE CENTRAL AND NORTHEAST OREGON WHILE THE WARM
FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS LOWER TO 4500-5500
FEET ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES SUNDAY NIGHT
AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN CENTRAL AND NORTHEAST
OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE BUILDS OVER THE REGION
MONDAY AND MONDAY NIGHT FOR SINKING AIR YIELDING MAINLY DRY
CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL KEEP A LOW CHANCE OF
PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

&&

.AVIATION....AVIATION...18Z TAFS...A COLD FRONT IS MOVING ACROSS THE
LOWER COLUMBIA BASIN THIS MORNING WITH KPDT RADAR SHOWING RAIN AHEAD
OF THE FRONT ALONG THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS AND
-RA AT KPDT AND KALW, WHICH SHOULD END BY 20Z. AREAS OF MVFR/IFR
CIGS/VSBY IN FOG AND LOW STRATUS ARE EXPECTED FOR REMAINDER OF THIS
MORNING WITH SOME IMPROVEMENT AFTER 20Z TO VFR. HOWEVER, KYKM IS
EXPECTED TO REMAIN MVFR/IFR THROUGH THIS AFTERNOON. AFTER 03Z/20TH
EXPECT CIGS TO LOWER  TO MVFR/IFR WITH SOME FOG THROUGH OVERNIGHT.
LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING.  POLAN

&&

.HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  49  47  56 /  20  80  90  80
ALW  39  50  45  56 /  20  80 100  90
PSC  37  48  43  55 /  20  80  80  40
YKM  35  41  36  49 /  20  80  80  40
HRI  36  49  44  58 /  20  80  80  50
ELN  32  39  34  46 /  20  90 100  60
RDM  35  49  42  55 /  50  80  80  70
LGD  35  45  40  51 /  20  90 100 100
GCD  35  48  42  51 /  20  80 100  80
DLS  36  45  44  54 /  40  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 4 PM PST
     SATURDAY FOR WESTERN KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/89/99












000
FXUS66 KPDT 192249
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
248 PM PST FRI DEC 19 2014

.SHORT TERM...TONIGHT AND SATURDAY...WILL SEE A BRIEF BREAK IN
PRECIP THIS EVENING, THEN A STRONG PACIFIC STORM WILL MOVE INTO THE
REGION LATE TONIGHT AND SATURDAY. THIS SYSTEM WILL CAUSE SIGNIFICANT
PRECIPITATION AND INCREASING WINDS, ESPECIALLY DURING THE DAY
SATURDAY. SNOW LEVELS ACROSS MUCH OF THE REGION WILL BE BETWEEN 3500
AND 4000 FEET OVERNIGHT. THESE SNOW LEVELS WILL GRADUALLY RISE
ACROSS THE AREA SATURDAY AS THE PRECIP AND WINDS INCREASE. STILL
UNCERTAIN AS TO THE AMOUNT OF SNOW THAT WILL FALL OVER THE HIGHER
ELEVATIONS EAST OF THE CASCADES. THE MAIN SNOW FALL IN THESE AREAS
WILL OCCUR DURING THE DAY SATURDAY, AND WILL THEREFORE HOLD OFF ON
ISSUING ADVISORIES IN THESE AREAS. DO HAVE DECENT CONFIDENCE THAT
SIGNIFICANT SNOW WILL ACCUMULATE, ESPECIALLY ABOVE 2000 FEET, IN
WESTERN KITTITAS COUNTY LATE TONIGHT INTO SATURDAY. THUS WILL ISSUE
A WINTER WEATHER ADVISORY FOR SNOW IN THIS AREA. WINDS WILL INCREASE
AND BECOME VERY WINDY OVER PORTIONS OF THE AREA SATURDAY AFTERNOON
AND WILL WIND ADVISORIES FOR A NUMBER OF OUR CENTRAL OREGON AND
WASHINGTON ZONES, AS WELL AS THE BLUE MTN FOOTHILLS. 90

.LONG TERM...SATURDAY NIGHT THROUGH MONDAY NIGHT...A VERY STRONG
UPPER LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG
DYNAMIC LIFT TO FORECAST AREA SATURDAY NIGHT THROUGH SUNDAY NIGHT.
THE JET STREAM WILL USHER IN A WARM FRONT WITH DRAMATICALLY RISING
SNOW LEVELS DURING THE DAY ON SATURDAY NIGHT AND SUNDAY RESULTING IN
COPIOUS AMOUNTS OF RAIN FALLING ON THE SNOWPACK IN THE MOUNTAINS.
TEMPERATURES WILL ALSO REMAIN ABOVE FREEZING IN MUCH OF THE
MOUNTAINS SATURDAY NIGHT AND SUNDAY NIGHT RESULTING IN SNOWMELT AND
RUNOFF FROM SNOWMELT AND THE RAIN. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
1.00-1.50 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS AND THE
WALLOWA MOUNTAINS FOR THE 36 HOUR PERIOD FROM SUNDOWN ON SATURDAY
AFTERNOON THROUGH SUNUP ON MONDAY. LOWER ELEVATIONS CAN EXPECT TO
RECEIVE ANYWHERE FROM 0.20 TO 1.00 INCH OF RAIN FROM SATURDAY NIGHT
THROUGH SUNDAY NIGHT. SNOW LEVELS RISE TO AROUND 6000-8000 BY
DAYBREAK ON SUNDAY WITH THE LOWER SNOW LEVELS IN THE WASHINGTON
CASCADES. SNOW LEVELS WILL REMAIN HIGH ON SUNDAY, AROUND 6000 FEET
ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES AND RISE TO
7500-8500 FEET IN THE CENTRAL AND NORTHEAST OREGON WHILE THE WARM
FRONT REMAINS OVERHEAD ON SUNDAY. SNOW LEVELS LOWER TO 4500-5500
FEET ALONG THE EAST SLOPES OF THE WASHINGTON CASCADES SUNDAY NIGHT
AND LOWER TO 6000-7500 FEET SUNDAY NIGHT IN CENTRAL AND NORTHEAST
OREGON. AN UPPER LEVEL RIDGE OF HIGH PRESSURE BUILDS OVER THE REGION
MONDAY AND MONDAY NIGHT FOR SINKING AIR YIELDING MAINLY DRY
CONDITIONS, ALTHOUGH THE HIGHER MOUNTAINS WILL KEEP A LOW CHANCE OF
PRECIPITATION MONDAY/MONDAY NIGHT.  POLAN

TUESDAY THROUGH FRIDAY NIGHT...WEAK HIGH PRESSURE WILL REMAIN OVER
THE AREA THROUGH THE MORNING OF CHRISTMAS EVE. MODELS ARE STRUGGLING
WITH THE AMPLITUDE OF THE HIGH...AS THE ECMWF IS MORE SUPPRESSED AND
WILL PROVIDE A MORE MOIST WESTERLY FLOW TO THE AREA. THE GFS HAS THE
RIDGE MORE AMPLIFIED WITH THE MOISTURE OVERRUNING TO THE NORTH.
ASSUMING MINIMAL CLOUD COVER THIS WOULD PRESENT A FOG SCENARIO FOR
THE LOWER ELEVATIONS.

WEDNESDAY EVENING A WEATHER SYSTEM IS EXPECTED TO IMPACT THE AREA
WITH MORE FAVORABLE CHANCES OF PRECIPITATION. BUT MODELS HAVE BEEN
STRUGGLING TO HANDLE THE SNOW LEVELS AND WHEN THE RAIN WILL
TRANSITION TO SNOW. LATEST GFS GUIDANCE INDICATES THAT THE LOWER
ELEVATIONS MAY NOT COOL DOWN ENOUGH FOR SNOW BY FRIDAY NIGHT. BUT
THE ECMWF HAS SNOW AT ALL LEVELS LATE CHRISTMAS EVE. RIGHT NOW SNOW
AMOUNTS ARE TOO DIFFICULT TO FORECAST WITH THE RUN TO RUN
INCONSISTENCY AND LACK OF CURRENT MODEL AGREEMENT. AS THE SYSTEM
EXITS THE AREA...COLD DRY NORTHWEST FLOW SETS IN FOR THE REMAINDER
OF THE EXTENDED. WEBER

&&

.AVIATION....AVIATION...18Z TAFS...A COLD FRONT IS MOVING ACROSS THE
LOWER COLUMBIA BASIN THIS MORNING WITH KPDT RADAR SHOWING RAIN AHEAD
OF THE FRONT ALONG THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS AND
-RA AT KPDT AND KALW, WHICH SHOULD END BY 20Z. AREAS OF MVFR/IFR
CIGS/VSBY IN FOG AND LOW STRATUS ARE EXPECTED FOR REMAINDER OF THIS
MORNING WITH SOME IMPROVEMENT AFTER 20Z TO VFR. HOWEVER, KYKM IS
EXPECTED TO REMAIN MVFR/IFR THROUGH THIS AFTERNOON. AFTER 03Z/20TH
EXPECT CIGS TO LOWER  TO MVFR/IFR WITH SOME FOG THROUGH OVERNIGHT.
LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING.  POLAN

&&

.HYDROLOGY...THE NEXT PACIFIC SYSTEM WILL BRING SIGNIFICANT
PRECIPITATION TO THE REGION THIS WEEKEND. INITIALLY THE PRECIP WILL
FALL AS SNOW AT THE HIGHEST ELEVATIONS, BUT SNOW LEVELS WILL RISE
SATURDAY INTO SUNDAY. THUS THERE WILL BE A COMBINATION OF RAIN AND
SNOW MELT LEADING TO SIGNIFICANT RISES ON AREA RIVERS SUNDAY INTO
MONDAY. AS SUCH WILL ISSUE FLOOD WATCHES FOR A LARGE PORTION OF THE
AREA. 90

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  36  49  47  56 /  20  80  90  80
ALW  39  50  45  56 /  20  80 100  90
PSC  37  48  43  55 /  20  80  80  40
YKM  35  41  36  49 /  20  80  80  40
HRI  36  49  44  58 /  20  80  80  50
ELN  32  39  34  46 /  20  90 100  60
RDM  35  49  42  55 /  50  80  80  70
LGD  35  45  40  51 /  20  90 100 100
GCD  35  48  42  51 /  20  80 100  80
DLS  36  45  44  54 /  40  90 100  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ041-509>511.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ510-511.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     ORZ049-050-502-503-505>508.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ507.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY ORZ508.

WA...FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ024-026-027-520-521.

     FLOOD WATCH FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON
     WAZ029-030.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ027-521.

     WIND ADVISORY FROM NOON SATURDAY TO NOON PST SUNDAY WAZ029.

     WINTER WEATHER ADVISORY FROM 10 PM THIS EVENING TO 4 PM PST
     SATURDAY FOR WESTERN KITTITAS COUNTY IN THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/89/99











000
FXUS66 KPDT 191803 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1000 AM PST FRI DEC 19 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...MORNING UPDATE...THE LATEST PACIFIC SYSTEM CONTINUES
TO MOVE THROUGH THE EASTERN END OF OUR AREA WITH THE STEADIEST
PRECIP FROM THE EASTERN BLUE MOUNTAIN FOOTHILLS EASTWARD. ELSEWHERE
PRECIP IS LIGHT AND SPOTTY. UPSLOPE FLOW WILL KEEP PRECIP CHANCES
HIGH NEAR THE CASCADE CREST AND IN THE NORTHEASTERN MOUNTAINS INTO
THE AFTERNOON. HAVE ADJUSTED POPS TO INDICATE A GRADUAL DECREASE
THROUGH THE DAY BETWEEN THE CASCADE EAST SLOPES AND THE EASTERN
MOUNTAINS. SNOW LEVELS REMAIN BETWEEN 2500 AND 2800 FEET OVER
CENTRAL WASHINGTON, BUT SHOULD RISE TO NEAR 3000 FEET THIS
AFTERNOON. ELSEWHERE EXPECT SNOW LEVELS TO RUN BETWEEN 4000 AND 5000
FEET THROUGH THE DAY. AS SUCH HAVE ADJUSTED SNOW LEVELS WITH THIS
UPDATE. SNOW AMOUNTS TODAY WILL BE 3 INCHES OR LESS WITH THE HIGHER
AMOUNTS OVER THE NORTHERN BLUES ABOVE 5000 FEET. WINDS OVER THE
BASIN WILL REMAIN LIGHT TODAY, BUT MIXING WILL GRADUALLY IMPROVE.
MIXING WILL CONTINUE TO IMPROVE THROUGH THE WEEKEND WITH INCREASING
WINDS. THUS WILL ALLOW THE AIR STAGNATION ADVISORY END AT 10 AM.
PATCHES OF FOG, WITH VERY LIMITED DENSE FOG, WILL GRADUALLY
DISSIPATE THROUGH THE MORNING AND EARLY AFTERNOON. 90

&&

.AVIATION...18Z TAFS...A COLD FRONT IS MOVING ACROSS THE LOWER
COLUMBIA BASIN THIS MORNING WITH KPDT RADAR SHOWING RAIN AHEAD OF
THE FRONT ALONG THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS AND -RA
AT KPDT AND KALW, WHICH SHOULD END BY 20Z. AREAS OF MVFR/IFR
CIGS/VSBY IN FOG AND LOW STRATUS ARE EXPECTED FOR REMAINDER OF THIS
MORNING WITH SOME IMPROVEMENT AFTER 20Z TO VFR. HOWEVER, KYKM IS
EXPECTED TO REMAIN MVFR/IFR THROUGH THIS AFTERNOON. AFTER 03Z/20TH
EXPECT CIGS TO LOWER  TO MVFR/IFR WITH SOME FOG THROUGH OVERNIGHT.
LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING.  POLAN

&&

.LONG TERM...PREVIOUS DISCUSSION...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  80  20  80  80
ALW  48  36  48  43 /  80  20  80  80
PSC  47  36  48  40 /  60  10  80  50
YKM  43  32  42  33 /  30  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  30  20  80  70
RDM  45  33  48  39 /  60  30  80  60
LGD  45  34  42  38 /  80  20  90  90
GCD  46  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  50  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/78/99







000
FXUS66 KPDT 191803 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1000 AM PST FRI DEC 19 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...MORNING UPDATE...THE LATEST PACIFIC SYSTEM CONTINUES
TO MOVE THROUGH THE EASTERN END OF OUR AREA WITH THE STEADIEST
PRECIP FROM THE EASTERN BLUE MOUNTAIN FOOTHILLS EASTWARD. ELSEWHERE
PRECIP IS LIGHT AND SPOTTY. UPSLOPE FLOW WILL KEEP PRECIP CHANCES
HIGH NEAR THE CASCADE CREST AND IN THE NORTHEASTERN MOUNTAINS INTO
THE AFTERNOON. HAVE ADJUSTED POPS TO INDICATE A GRADUAL DECREASE
THROUGH THE DAY BETWEEN THE CASCADE EAST SLOPES AND THE EASTERN
MOUNTAINS. SNOW LEVELS REMAIN BETWEEN 2500 AND 2800 FEET OVER
CENTRAL WASHINGTON, BUT SHOULD RISE TO NEAR 3000 FEET THIS
AFTERNOON. ELSEWHERE EXPECT SNOW LEVELS TO RUN BETWEEN 4000 AND 5000
FEET THROUGH THE DAY. AS SUCH HAVE ADJUSTED SNOW LEVELS WITH THIS
UPDATE. SNOW AMOUNTS TODAY WILL BE 3 INCHES OR LESS WITH THE HIGHER
AMOUNTS OVER THE NORTHERN BLUES ABOVE 5000 FEET. WINDS OVER THE
BASIN WILL REMAIN LIGHT TODAY, BUT MIXING WILL GRADUALLY IMPROVE.
MIXING WILL CONTINUE TO IMPROVE THROUGH THE WEEKEND WITH INCREASING
WINDS. THUS WILL ALLOW THE AIR STAGNATION ADVISORY END AT 10 AM.
PATCHES OF FOG, WITH VERY LIMITED DENSE FOG, WILL GRADUALLY
DISSIPATE THROUGH THE MORNING AND EARLY AFTERNOON. 90

&&

.AVIATION...18Z TAFS...A COLD FRONT IS MOVING ACROSS THE LOWER
COLUMBIA BASIN THIS MORNING WITH KPDT RADAR SHOWING RAIN AHEAD OF
THE FRONT ALONG THE FOOTHILLS OF THE NORTHERN BLUE MOUNTAINS AND -RA
AT KPDT AND KALW, WHICH SHOULD END BY 20Z. AREAS OF MVFR/IFR
CIGS/VSBY IN FOG AND LOW STRATUS ARE EXPECTED FOR REMAINDER OF THIS
MORNING WITH SOME IMPROVEMENT AFTER 20Z TO VFR. HOWEVER, KYKM IS
EXPECTED TO REMAIN MVFR/IFR THROUGH THIS AFTERNOON. AFTER 03Z/20TH
EXPECT CIGS TO LOWER  TO MVFR/IFR WITH SOME FOG THROUGH OVERNIGHT.
LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING.  POLAN

&&

.LONG TERM...PREVIOUS DISCUSSION...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  80  20  80  80
ALW  48  36  48  43 /  80  20  80  80
PSC  47  36  48  40 /  60  10  80  50
YKM  43  32  42  33 /  30  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  30  20  80  70
RDM  45  33  48  39 /  60  30  80  60
LGD  45  34  42  38 /  80  20  90  90
GCD  46  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  50  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/78/99








000
FXUS66 KPDT 191753
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
952 AM PST FRI DEC 19 2014

.SHORT TERM...MORNING UPDATE...THE LATEST PACIFIC SYSTEM CONTINUES
TO MOVE THROUGH THE EASTERN END OF OUR AREA WITH THE STEADIEST
PRECIP FROM THE EASTERN BLUE MOUNTAIN FOOTHILLS EASTWARD. ELSEWHERE
PRECIP IS LIGHT AND SPOTTY. UPSLOPE FLOW WILL KEEP PRECIP CHANCES
HIGH NEAR THE CASCADE CREST AND IN THE NORTHEASTERN MOUNTAINS INTO
THE AFTERNOON. HAVE ADJUSTED POPS TO INDICATE A GRADUAL DECREASE
THROUGH THE DAY BETWEEN THE CASCADE EAST SLOPES AND THE EASTERN
MOUNTAINS. SNOW LEVELS REMAIN BETWEEN 2500 AND 2800 FEET OVER
CENTRAL WASHINGTON, BUT SHOULD RISE TO NEAR 3000 FEET THIS
AFTERNOON. ELSEWHERE EXPECT SNOW LEVELS TO RUN BETWEEN 4000 AND 5000
FEET THROUGH THE DAY. AS SUCH HAVE ADJUSTED SNOW LEVELS WITH THIS
UPDATE. SNOW AMOUNTS TODAY WILL BE 3 INCHES OR LESS WITH THE HIGHER
AMOUNTS OVER THE NORTHERN BLUES ABOVE 5000 FEET. WINDS OVER THE
BASIN WILL REMAIN LIGHT TODAY, BUT MIXING WILL GRADUALLY IMPROVE.
MIXING WILL CONTINUE TO IMPROVE THROUGH THE WEEKEND WITH INCREASING
WINDS. THUS WILL ALLOW THE AIR STAGNATION ADVISORY END AT 10 AM.
PATCHES OF FOG, WITH VERY LIMITED DENSE FOG, WILL GRADUALLY
DISSIPATE THROUGH THE MORNING AND EARLY AFTERNOON. 90

.LONG TERM...PREVIOUS DISCUSSION...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS.

&&

.AVIATION...PREVIOUS DISCUSSION...12Z TAFS...WIDESPREAD MVFR/IFR
CIGS/VSBYS IN FOG AND RAIN ARE EXPECTED THIS MORNING WITH SOME
IMPROVEMENT AFTER 18Z POSSIBLE. WINDS WILL BE LIGHT ALTHOUGH SOME 5
TO 10 KT WINDS MAY DEVELOP THIS AFTERNOON MAINLY FROM THE SW. AFTER
03Z EXPECT CIGS TO LOWER ONCE AGAIN TO MVFR/IFR WITH SOME FOG FOR
THE BALANCE OF THE NIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY
MORNING.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  80  20  80  80
ALW  48  36  48  43 /  80  20  80  80
PSC  47  36  48  40 /  60  10  80  50
YKM  43  32  42  33 /  30  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  30  20  80  70
RDM  45  33  48  39 /  60  30  80  60
LGD  45  34  42  38 /  80  20  90  90
GCD  46  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  50  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/78/99









000
FXUS66 KPDT 191753
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
952 AM PST FRI DEC 19 2014

.SHORT TERM...MORNING UPDATE...THE LATEST PACIFIC SYSTEM CONTINUES
TO MOVE THROUGH THE EASTERN END OF OUR AREA WITH THE STEADIEST
PRECIP FROM THE EASTERN BLUE MOUNTAIN FOOTHILLS EASTWARD. ELSEWHERE
PRECIP IS LIGHT AND SPOTTY. UPSLOPE FLOW WILL KEEP PRECIP CHANCES
HIGH NEAR THE CASCADE CREST AND IN THE NORTHEASTERN MOUNTAINS INTO
THE AFTERNOON. HAVE ADJUSTED POPS TO INDICATE A GRADUAL DECREASE
THROUGH THE DAY BETWEEN THE CASCADE EAST SLOPES AND THE EASTERN
MOUNTAINS. SNOW LEVELS REMAIN BETWEEN 2500 AND 2800 FEET OVER
CENTRAL WASHINGTON, BUT SHOULD RISE TO NEAR 3000 FEET THIS
AFTERNOON. ELSEWHERE EXPECT SNOW LEVELS TO RUN BETWEEN 4000 AND 5000
FEET THROUGH THE DAY. AS SUCH HAVE ADJUSTED SNOW LEVELS WITH THIS
UPDATE. SNOW AMOUNTS TODAY WILL BE 3 INCHES OR LESS WITH THE HIGHER
AMOUNTS OVER THE NORTHERN BLUES ABOVE 5000 FEET. WINDS OVER THE
BASIN WILL REMAIN LIGHT TODAY, BUT MIXING WILL GRADUALLY IMPROVE.
MIXING WILL CONTINUE TO IMPROVE THROUGH THE WEEKEND WITH INCREASING
WINDS. THUS WILL ALLOW THE AIR STAGNATION ADVISORY END AT 10 AM.
PATCHES OF FOG, WITH VERY LIMITED DENSE FOG, WILL GRADUALLY
DISSIPATE THROUGH THE MORNING AND EARLY AFTERNOON. 90

.LONG TERM...PREVIOUS DISCUSSION...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS.

&&

.AVIATION...PREVIOUS DISCUSSION...12Z TAFS...WIDESPREAD MVFR/IFR
CIGS/VSBYS IN FOG AND RAIN ARE EXPECTED THIS MORNING WITH SOME
IMPROVEMENT AFTER 18Z POSSIBLE. WINDS WILL BE LIGHT ALTHOUGH SOME 5
TO 10 KT WINDS MAY DEVELOP THIS AFTERNOON MAINLY FROM THE SW. AFTER
03Z EXPECT CIGS TO LOWER ONCE AGAIN TO MVFR/IFR WITH SOME FOG FOR
THE BALANCE OF THE NIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY
MORNING.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  80  20  80  80
ALW  48  36  48  43 /  80  20  80  80
PSC  47  36  48  40 /  60  10  80  50
YKM  43  32  42  33 /  30  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  30  20  80  70
RDM  45  33  48  39 /  60  30  80  60
LGD  45  34  42  38 /  80  20  90  90
GCD  46  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  50  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...NONE.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/78/99










000
FXUS66 KPDT 190959
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
159 AM PST FRI DEC 19 2014

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT...AN ACTIVE WEATHER
PATTERN IS EXPECTED DURING THE NEXT FEW DAYS. A WEATHER SYSTEM IS
CURRENTLY MOVING THROUGH THE CWA AT THIS TIME WITH AREAS OF RAIN AND
MOUNTAIN SNOW FROM THE CASCADES EASTWARD ACROSS EASTERN WA/OR. THE
SNOW LEVELS ARE LOW ENOUGH WITH TRAPPED COLD AIR ALONG THE
WASHINGTON CASCADE EAST SLOPES SUCH THAT A WINTER WEATHER ADVISORY
IS IN EFFECT THERE. THE SNOW WILL TAPER OFF BY MORNING AND THE
ADVISORY ENDS AT 7 AM. SNOW LEVELS WILL RISE TO BETWEEN 2500 FEET IN
NORTHWEST AREAS TO AROUND 4500 FEET IN CENTRAL OREGON. THE BLUE
MOUNTAINS WILL HAVE SNOW LEVELS AROUND 3500 FEET...WHICH MAY BE
PESSIMISTIC GIVEN THE FACT THAT KMEH IS AT 37 DEGREES AND LIGHT RAIN
IS FALLING. WILL NEED TO RAISE SNOW LEVELS IN THE BLUE MOUNTAINS
THIS MORNING. GUSTY SOUTHERLY WINDS ARE OCCURRING IN THE SOUTHERN
GRANDE RONDE VALLEY THIS MORNING WITH WIND SPEEDS BETWEEN 20-30 MPH
WITH GUSTS TO 35-40 MPH. THIS IS NEAR ADVISORY CRITERIA AND WILL
HAVE TO KEEP A CLOSE EYE ON IT EARLY THIS MORNING IN CASE AN
ADVISORY BECOMES NEEDED. THERE WILL BE A BRIEF BREAK IN THE WEATHER
THIS AFTERNOON AND EVENING BUT STILL SOME RAIN AND MOUNTAIN SNOW
SHOWERS OVER THE CASCADE EAST SLOPES AND THE NORTHEAST MOUNTAINS.
THE NEXT SYSTEM WILL BE STRONGER AND WETTER AS A STRONG WESTERLY 125
KT JET STREAM MOVES INTO THE PACIFIC NORTHWEST. THIS WILL PROVIDE
SIGNIFICANT UPSLOPE PRECIPITATION WITH SPILL OVER OVER THE CASCADES
AND THEN SOME UPSLOPE ENHANCEMENT OVER THE EASTERN AND NORTHEAST
MOUNTAINS. EXPECT FROM 3 TO 6 INCHES OF RAIN OVER THE CASCADES AND 2
TO 3 INCHES OVER THE NORTHEAST MOUNTAINS. SNOW LEVELS WILL RISE TO
AROUND 8000 FEET BY SATURDAY EVENING WHICH WILL KEEP THE
PRECIPITATION AS MAINLY RAIN OVER THE MOUNTAINS. SMALL RIVERS AND
STREAMS ARE LIKELY TO RISE AND THERE MAY BE SOME LOCAL FLOODING ON
THEM. THE LARGER MAIN STEM RIVERS WILL SEE SIGNIFICANT RISES BUT ARE
NOT AT THIS TIME EXPECTED TO GO ABOVE FLOOD STAGE. SOME RIVERS ARE
EXPECTED TO REACH ACTION STAGE THOUGH AND THAT WILL BE COVERED WITH
RIVER STATEMENTS. IN ADDITION TO THE RAINFALL THE WINDS WILL
INCREASE SIGNIFICANTLY SATURDAY NIGHT AND SUNDAY DUE TO DOWNWARD
TRANSPORT AND MIXING SUCH THAT THERE MAY BE WIND ADVISORIES
NEEDED...ESPECIALLY FOR THE BLUE MOUNTAINS AND FOOTHILLS AND
LADD/PYLES CANYONS. TEMPERATURES WILL BE ON A WARMING TREND THROUGH
THE SHORT TERM PERIOD. 88

.LONG TERM...SUNDAY THROUGH FRIDAY...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS. 78

&&

.AVIATION...12Z TAFS...WIDESPREAD MVFR/IFR CIGS/VSBYS IN FOG AND
RAIN ARE EXPECTED THIS MORNING WITH SOME IMPROVEMENT AFTER 18Z
POSSIBLE. WINDS WILL BE LIGHT ALTHOUGH SOME 5 TO 10 KT WINDS MAY
DEVELOP THIS AFTERNOON MAINLY FROM THE SW. AFTER 03Z EXPECT CIGS TO
LOWER ONCE AGAIN TO MVFR/IFR WITH SOME FOG FOR THE BALANCE OF THE
NIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  70  20  80  80
ALW  46  36  48  43 /  80  20  80  80
PSC  48  36  48  40 /  60  10  80  50
YKM  44  32  42  33 /  50  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  50  20  80  70
RDM  44  33  48  39 /  60  30  80  60
LGD  41  34  42  38 /  80  20  90  90
GCD  41  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  70  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST THIS MORNING ABOVE 2500
     FEET FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/78/78






000
FXUS66 KPDT 190959
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
159 AM PST FRI DEC 19 2014

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT...AN ACTIVE WEATHER
PATTERN IS EXPECTED DURING THE NEXT FEW DAYS. A WEATHER SYSTEM IS
CURRENTLY MOVING THROUGH THE CWA AT THIS TIME WITH AREAS OF RAIN AND
MOUNTAIN SNOW FROM THE CASCADES EASTWARD ACROSS EASTERN WA/OR. THE
SNOW LEVELS ARE LOW ENOUGH WITH TRAPPED COLD AIR ALONG THE
WASHINGTON CASCADE EAST SLOPES SUCH THAT A WINTER WEATHER ADVISORY
IS IN EFFECT THERE. THE SNOW WILL TAPER OFF BY MORNING AND THE
ADVISORY ENDS AT 7 AM. SNOW LEVELS WILL RISE TO BETWEEN 2500 FEET IN
NORTHWEST AREAS TO AROUND 4500 FEET IN CENTRAL OREGON. THE BLUE
MOUNTAINS WILL HAVE SNOW LEVELS AROUND 3500 FEET...WHICH MAY BE
PESSIMISTIC GIVEN THE FACT THAT KMEH IS AT 37 DEGREES AND LIGHT RAIN
IS FALLING. WILL NEED TO RAISE SNOW LEVELS IN THE BLUE MOUNTAINS
THIS MORNING. GUSTY SOUTHERLY WINDS ARE OCCURRING IN THE SOUTHERN
GRANDE RONDE VALLEY THIS MORNING WITH WIND SPEEDS BETWEEN 20-30 MPH
WITH GUSTS TO 35-40 MPH. THIS IS NEAR ADVISORY CRITERIA AND WILL
HAVE TO KEEP A CLOSE EYE ON IT EARLY THIS MORNING IN CASE AN
ADVISORY BECOMES NEEDED. THERE WILL BE A BRIEF BREAK IN THE WEATHER
THIS AFTERNOON AND EVENING BUT STILL SOME RAIN AND MOUNTAIN SNOW
SHOWERS OVER THE CASCADE EAST SLOPES AND THE NORTHEAST MOUNTAINS.
THE NEXT SYSTEM WILL BE STRONGER AND WETTER AS A STRONG WESTERLY 125
KT JET STREAM MOVES INTO THE PACIFIC NORTHWEST. THIS WILL PROVIDE
SIGNIFICANT UPSLOPE PRECIPITATION WITH SPILL OVER OVER THE CASCADES
AND THEN SOME UPSLOPE ENHANCEMENT OVER THE EASTERN AND NORTHEAST
MOUNTAINS. EXPECT FROM 3 TO 6 INCHES OF RAIN OVER THE CASCADES AND 2
TO 3 INCHES OVER THE NORTHEAST MOUNTAINS. SNOW LEVELS WILL RISE TO
AROUND 8000 FEET BY SATURDAY EVENING WHICH WILL KEEP THE
PRECIPITATION AS MAINLY RAIN OVER THE MOUNTAINS. SMALL RIVERS AND
STREAMS ARE LIKELY TO RISE AND THERE MAY BE SOME LOCAL FLOODING ON
THEM. THE LARGER MAIN STEM RIVERS WILL SEE SIGNIFICANT RISES BUT ARE
NOT AT THIS TIME EXPECTED TO GO ABOVE FLOOD STAGE. SOME RIVERS ARE
EXPECTED TO REACH ACTION STAGE THOUGH AND THAT WILL BE COVERED WITH
RIVER STATEMENTS. IN ADDITION TO THE RAINFALL THE WINDS WILL
INCREASE SIGNIFICANTLY SATURDAY NIGHT AND SUNDAY DUE TO DOWNWARD
TRANSPORT AND MIXING SUCH THAT THERE MAY BE WIND ADVISORIES
NEEDED...ESPECIALLY FOR THE BLUE MOUNTAINS AND FOOTHILLS AND
LADD/PYLES CANYONS. TEMPERATURES WILL BE ON A WARMING TREND THROUGH
THE SHORT TERM PERIOD. 88

.LONG TERM...SUNDAY THROUGH FRIDAY...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS. 78

&&

.AVIATION...12Z TAFS...WIDESPREAD MVFR/IFR CIGS/VSBYS IN FOG AND
RAIN ARE EXPECTED THIS MORNING WITH SOME IMPROVEMENT AFTER 18Z
POSSIBLE. WINDS WILL BE LIGHT ALTHOUGH SOME 5 TO 10 KT WINDS MAY
DEVELOP THIS AFTERNOON MAINLY FROM THE SW. AFTER 03Z EXPECT CIGS TO
LOWER ONCE AGAIN TO MVFR/IFR WITH SOME FOG FOR THE BALANCE OF THE
NIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  70  20  80  80
ALW  46  36  48  43 /  80  20  80  80
PSC  48  36  48  40 /  60  10  80  50
YKM  44  32  42  33 /  50  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  50  20  80  70
RDM  44  33  48  39 /  60  30  80  60
LGD  41  34  42  38 /  80  20  90  90
GCD  41  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  70  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST THIS MORNING ABOVE 2500
     FEET FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/78/78







000
FXUS66 KPDT 190959
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
159 AM PST FRI DEC 19 2014

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT...AN ACTIVE WEATHER
PATTERN IS EXPECTED DURING THE NEXT FEW DAYS. A WEATHER SYSTEM IS
CURRENTLY MOVING THROUGH THE CWA AT THIS TIME WITH AREAS OF RAIN AND
MOUNTAIN SNOW FROM THE CASCADES EASTWARD ACROSS EASTERN WA/OR. THE
SNOW LEVELS ARE LOW ENOUGH WITH TRAPPED COLD AIR ALONG THE
WASHINGTON CASCADE EAST SLOPES SUCH THAT A WINTER WEATHER ADVISORY
IS IN EFFECT THERE. THE SNOW WILL TAPER OFF BY MORNING AND THE
ADVISORY ENDS AT 7 AM. SNOW LEVELS WILL RISE TO BETWEEN 2500 FEET IN
NORTHWEST AREAS TO AROUND 4500 FEET IN CENTRAL OREGON. THE BLUE
MOUNTAINS WILL HAVE SNOW LEVELS AROUND 3500 FEET...WHICH MAY BE
PESSIMISTIC GIVEN THE FACT THAT KMEH IS AT 37 DEGREES AND LIGHT RAIN
IS FALLING. WILL NEED TO RAISE SNOW LEVELS IN THE BLUE MOUNTAINS
THIS MORNING. GUSTY SOUTHERLY WINDS ARE OCCURRING IN THE SOUTHERN
GRANDE RONDE VALLEY THIS MORNING WITH WIND SPEEDS BETWEEN 20-30 MPH
WITH GUSTS TO 35-40 MPH. THIS IS NEAR ADVISORY CRITERIA AND WILL
HAVE TO KEEP A CLOSE EYE ON IT EARLY THIS MORNING IN CASE AN
ADVISORY BECOMES NEEDED. THERE WILL BE A BRIEF BREAK IN THE WEATHER
THIS AFTERNOON AND EVENING BUT STILL SOME RAIN AND MOUNTAIN SNOW
SHOWERS OVER THE CASCADE EAST SLOPES AND THE NORTHEAST MOUNTAINS.
THE NEXT SYSTEM WILL BE STRONGER AND WETTER AS A STRONG WESTERLY 125
KT JET STREAM MOVES INTO THE PACIFIC NORTHWEST. THIS WILL PROVIDE
SIGNIFICANT UPSLOPE PRECIPITATION WITH SPILL OVER OVER THE CASCADES
AND THEN SOME UPSLOPE ENHANCEMENT OVER THE EASTERN AND NORTHEAST
MOUNTAINS. EXPECT FROM 3 TO 6 INCHES OF RAIN OVER THE CASCADES AND 2
TO 3 INCHES OVER THE NORTHEAST MOUNTAINS. SNOW LEVELS WILL RISE TO
AROUND 8000 FEET BY SATURDAY EVENING WHICH WILL KEEP THE
PRECIPITATION AS MAINLY RAIN OVER THE MOUNTAINS. SMALL RIVERS AND
STREAMS ARE LIKELY TO RISE AND THERE MAY BE SOME LOCAL FLOODING ON
THEM. THE LARGER MAIN STEM RIVERS WILL SEE SIGNIFICANT RISES BUT ARE
NOT AT THIS TIME EXPECTED TO GO ABOVE FLOOD STAGE. SOME RIVERS ARE
EXPECTED TO REACH ACTION STAGE THOUGH AND THAT WILL BE COVERED WITH
RIVER STATEMENTS. IN ADDITION TO THE RAINFALL THE WINDS WILL
INCREASE SIGNIFICANTLY SATURDAY NIGHT AND SUNDAY DUE TO DOWNWARD
TRANSPORT AND MIXING SUCH THAT THERE MAY BE WIND ADVISORIES
NEEDED...ESPECIALLY FOR THE BLUE MOUNTAINS AND FOOTHILLS AND
LADD/PYLES CANYONS. TEMPERATURES WILL BE ON A WARMING TREND THROUGH
THE SHORT TERM PERIOD. 88

.LONG TERM...SUNDAY THROUGH FRIDAY...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS. 78

&&

.AVIATION...12Z TAFS...WIDESPREAD MVFR/IFR CIGS/VSBYS IN FOG AND
RAIN ARE EXPECTED THIS MORNING WITH SOME IMPROVEMENT AFTER 18Z
POSSIBLE. WINDS WILL BE LIGHT ALTHOUGH SOME 5 TO 10 KT WINDS MAY
DEVELOP THIS AFTERNOON MAINLY FROM THE SW. AFTER 03Z EXPECT CIGS TO
LOWER ONCE AGAIN TO MVFR/IFR WITH SOME FOG FOR THE BALANCE OF THE
NIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  70  20  80  80
ALW  46  36  48  43 /  80  20  80  80
PSC  48  36  48  40 /  60  10  80  50
YKM  44  32  42  33 /  50  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  50  20  80  70
RDM  44  33  48  39 /  60  30  80  60
LGD  41  34  42  38 /  80  20  90  90
GCD  41  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  70  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST THIS MORNING ABOVE 2500
     FEET FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/78/78







000
FXUS66 KPDT 190959
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
159 AM PST FRI DEC 19 2014

.SHORT TERM...TODAY THROUGH SATURDAY NIGHT...AN ACTIVE WEATHER
PATTERN IS EXPECTED DURING THE NEXT FEW DAYS. A WEATHER SYSTEM IS
CURRENTLY MOVING THROUGH THE CWA AT THIS TIME WITH AREAS OF RAIN AND
MOUNTAIN SNOW FROM THE CASCADES EASTWARD ACROSS EASTERN WA/OR. THE
SNOW LEVELS ARE LOW ENOUGH WITH TRAPPED COLD AIR ALONG THE
WASHINGTON CASCADE EAST SLOPES SUCH THAT A WINTER WEATHER ADVISORY
IS IN EFFECT THERE. THE SNOW WILL TAPER OFF BY MORNING AND THE
ADVISORY ENDS AT 7 AM. SNOW LEVELS WILL RISE TO BETWEEN 2500 FEET IN
NORTHWEST AREAS TO AROUND 4500 FEET IN CENTRAL OREGON. THE BLUE
MOUNTAINS WILL HAVE SNOW LEVELS AROUND 3500 FEET...WHICH MAY BE
PESSIMISTIC GIVEN THE FACT THAT KMEH IS AT 37 DEGREES AND LIGHT RAIN
IS FALLING. WILL NEED TO RAISE SNOW LEVELS IN THE BLUE MOUNTAINS
THIS MORNING. GUSTY SOUTHERLY WINDS ARE OCCURRING IN THE SOUTHERN
GRANDE RONDE VALLEY THIS MORNING WITH WIND SPEEDS BETWEEN 20-30 MPH
WITH GUSTS TO 35-40 MPH. THIS IS NEAR ADVISORY CRITERIA AND WILL
HAVE TO KEEP A CLOSE EYE ON IT EARLY THIS MORNING IN CASE AN
ADVISORY BECOMES NEEDED. THERE WILL BE A BRIEF BREAK IN THE WEATHER
THIS AFTERNOON AND EVENING BUT STILL SOME RAIN AND MOUNTAIN SNOW
SHOWERS OVER THE CASCADE EAST SLOPES AND THE NORTHEAST MOUNTAINS.
THE NEXT SYSTEM WILL BE STRONGER AND WETTER AS A STRONG WESTERLY 125
KT JET STREAM MOVES INTO THE PACIFIC NORTHWEST. THIS WILL PROVIDE
SIGNIFICANT UPSLOPE PRECIPITATION WITH SPILL OVER OVER THE CASCADES
AND THEN SOME UPSLOPE ENHANCEMENT OVER THE EASTERN AND NORTHEAST
MOUNTAINS. EXPECT FROM 3 TO 6 INCHES OF RAIN OVER THE CASCADES AND 2
TO 3 INCHES OVER THE NORTHEAST MOUNTAINS. SNOW LEVELS WILL RISE TO
AROUND 8000 FEET BY SATURDAY EVENING WHICH WILL KEEP THE
PRECIPITATION AS MAINLY RAIN OVER THE MOUNTAINS. SMALL RIVERS AND
STREAMS ARE LIKELY TO RISE AND THERE MAY BE SOME LOCAL FLOODING ON
THEM. THE LARGER MAIN STEM RIVERS WILL SEE SIGNIFICANT RISES BUT ARE
NOT AT THIS TIME EXPECTED TO GO ABOVE FLOOD STAGE. SOME RIVERS ARE
EXPECTED TO REACH ACTION STAGE THOUGH AND THAT WILL BE COVERED WITH
RIVER STATEMENTS. IN ADDITION TO THE RAINFALL THE WINDS WILL
INCREASE SIGNIFICANTLY SATURDAY NIGHT AND SUNDAY DUE TO DOWNWARD
TRANSPORT AND MIXING SUCH THAT THERE MAY BE WIND ADVISORIES
NEEDED...ESPECIALLY FOR THE BLUE MOUNTAINS AND FOOTHILLS AND
LADD/PYLES CANYONS. TEMPERATURES WILL BE ON A WARMING TREND THROUGH
THE SHORT TERM PERIOD. 88

.LONG TERM...SUNDAY THROUGH FRIDAY...AN UPPER LEVEL RIDGE WILL BUILD
OVER THE PACIFIC NORTHWEST SUNDAY THROUGH TUESDAY. THIS WILL RESULT
IN MILD TEMPERATURES FOR THIS TIME OF YEAR AND HIGH SNOW LEVELS.
THERE WILL STILL BE PLENTY OF MOISTURE AND RAINFALL ON SUNDAY AND
SUNDAY NIGHT. HEAVY AMOUNTS OF RAIN ARE LIKELY IN THE MOUNTAINS. IT
WILL ALSO BE WINDY SUNDAY MORNING WITH AT LEAST ADVISORY LEVEL WINDS
POSSIBLE. A SLIGHT DRYING TREND WILL FOLLOW FOR MONDAY AND TUESDAY
WITH JUST A CHANCE OF MAINLY MOUNTAIN SHOWERS. ON WEDNESDAY A
MODERATELY STRONG SHORTWAVE TROUGH WILL MOVE ACROSS THE AREA
USHERING IN MUCH COLDER AIR BY WEDNESDAY NIGHT WITH RAIN CHANGING TO
SNOW AREAWIDE. THE SNOW WILL LINGER IN THE EAST ON CHRISTMAS DAY. AS
OF NOW IT LOOKS LIKE SNOW ACCUMULATIONS WILL BE MOSTLY LIGHT. IT
WILL BE COLD THURSDAY NIGHT AND FRIDAY WITH BELOW NORMAL
TEMPERATURES AND MOSTLY DRY CONDITIONS. 78

&&

.AVIATION...12Z TAFS...WIDESPREAD MVFR/IFR CIGS/VSBYS IN FOG AND
RAIN ARE EXPECTED THIS MORNING WITH SOME IMPROVEMENT AFTER 18Z
POSSIBLE. WINDS WILL BE LIGHT ALTHOUGH SOME 5 TO 10 KT WINDS MAY
DEVELOP THIS AFTERNOON MAINLY FROM THE SW. AFTER 03Z EXPECT CIGS TO
LOWER ONCE AGAIN TO MVFR/IFR WITH SOME FOG FOR THE BALANCE OF THE
NIGHT. LIFR VSBYS ARE NOT EXPECTED SATURDAY MORNING. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  46  34  49  43 /  70  20  80  80
ALW  46  36  48  43 /  80  20  80  80
PSC  48  36  48  40 /  60  10  80  50
YKM  44  32  42  33 /  50  20  80  40
HRI  47  35  49  41 /  60  20  80  50
ELN  41  31  39  31 /  50  20  80  70
RDM  44  33  48  39 /  60  30  80  60
LGD  41  34  42  38 /  80  20  90  90
GCD  41  33  42  39 /  80  20  80  90
DLS  47  36  46  41 /  70  30  90  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST THIS MORNING ABOVE 2500
     FEET FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/78/78






000
FXUS66 KPDT 190521 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
921 PM PST THU DEC 18 2014

UPDATED FOR AVIATION DISCUSSION

.SHORT TERM...FRONTAL BOUNDARY MOVING INTO THE PACIFIC NORTHWEST
THIS EVENING. SOME LIGHT RAIN AND HIGHER ELEVATION SNOW HAS BEEN
MOVING THROUGH THE REGION OVER THE PAST SEVERAL HOURS. SATELLITE
ENHANCEMENT ALONG THE COAST AND RADAR SUGGEST MORE WIDESPREAD
PRECIPITATION WILL OCCUR LATER TONIGHT INTO FRIDAY MORNING. LOW
CLOUDS AND FOG LIKELY IN THE COLUMBIA BASIN TONIGHT AS WELL. AS THE
FRONT MOVES EAST OF THE FORECAST AREA FRIDAY THE PRECIPITATION WILL
QUICKLY DIMINISH WITH SKIES REMAINING MOSTLY CLOUDY. NEXT SYSTEM TO
IMPACT THE PAC NW WILL BE A WARM FRONT FRIDAY NIGHT INTO SATURDAY.
THIS FRONT HAS FAIRLY SIGNIFICANT MOISTURE ASSOCIATED WITH IT AND A
PERIOD OF STEADY RAIN, POSSIBLY HEAVY AT TIMES IS LIKELY. SOUTHERLY
SURFACE GRADIENTS AND WINDS ALOFT WILL BE INCREASING SATURDAY
RESULTING IN BREEZY TO WINDY CONDITIONS BY AFTERNOON AND EVENING. 94

&&

.AVIATION...06Z TAFS...EXPECT CATEGORIES TO VARY FROM VFR TO LIFR
OVER THE NEXT 24 HOURS...AS THE NEXT SYSTEM MOVES INTO THE PACIFIC
NORTHWEST.  OVERNIGHT TONIGHT...EXPECT RAIN SHOWERS TO TRANSITION
OVER TO STRATIFORM RAIN WITH MOSTLY MVFR CIGS AND VIS...BUT
LOCALIZED IFR/LIFR CONDITIONS ARE POSSIBLE.  DO NOT ANTICIPATE THAT
LIFR CONDITIONS WOULD PERSIST FOR MORE THAN AN HOUR...BUT PROLONGED
LIFR CONDITIONS CAN`T BE RULED OUT DUE TO LOW CLOUDS AND FOG THAT
CONTINUES TO MIX AROUND THE VALLEY LOCATIONS.  THESE LOW CLOUDS
COULD LINGER AROUND UNTIL THE NEXT PUSH OF WIND ON SATURDAY EVENING
INTO SUNDAY SHOULD MIX IT OUT OF THE VALLEY AREAS.  WEBER

&&

.PREV DISC... /ISSUED 454 PM PST THU DEC 18 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  70  70  20  80
ALW  37  46  37  47 /  70  70  20  80
PSC  36  49  36  47 /  70  50  10  80
YKM  35  43  32  43 /  70  30  20  80
HRI  35  48  35  48 /  70  50  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  50  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  70  20  80
DLS  37  48  36  48 /  80  60  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94/89







000
FXUS66 KPDT 190521 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
921 PM PST THU DEC 18 2014

UPDATED FOR AVIATION DISCUSSION

.SHORT TERM...FRONTAL BOUNDARY MOVING INTO THE PACIFIC NORTHWEST
THIS EVENING. SOME LIGHT RAIN AND HIGHER ELEVATION SNOW HAS BEEN
MOVING THROUGH THE REGION OVER THE PAST SEVERAL HOURS. SATELLITE
ENHANCEMENT ALONG THE COAST AND RADAR SUGGEST MORE WIDESPREAD
PRECIPITATION WILL OCCUR LATER TONIGHT INTO FRIDAY MORNING. LOW
CLOUDS AND FOG LIKELY IN THE COLUMBIA BASIN TONIGHT AS WELL. AS THE
FRONT MOVES EAST OF THE FORECAST AREA FRIDAY THE PRECIPITATION WILL
QUICKLY DIMINISH WITH SKIES REMAINING MOSTLY CLOUDY. NEXT SYSTEM TO
IMPACT THE PAC NW WILL BE A WARM FRONT FRIDAY NIGHT INTO SATURDAY.
THIS FRONT HAS FAIRLY SIGNIFICANT MOISTURE ASSOCIATED WITH IT AND A
PERIOD OF STEADY RAIN, POSSIBLY HEAVY AT TIMES IS LIKELY. SOUTHERLY
SURFACE GRADIENTS AND WINDS ALOFT WILL BE INCREASING SATURDAY
RESULTING IN BREEZY TO WINDY CONDITIONS BY AFTERNOON AND EVENING. 94

&&

.AVIATION...06Z TAFS...EXPECT CATEGORIES TO VARY FROM VFR TO LIFR
OVER THE NEXT 24 HOURS...AS THE NEXT SYSTEM MOVES INTO THE PACIFIC
NORTHWEST.  OVERNIGHT TONIGHT...EXPECT RAIN SHOWERS TO TRANSITION
OVER TO STRATIFORM RAIN WITH MOSTLY MVFR CIGS AND VIS...BUT
LOCALIZED IFR/LIFR CONDITIONS ARE POSSIBLE.  DO NOT ANTICIPATE THAT
LIFR CONDITIONS WOULD PERSIST FOR MORE THAN AN HOUR...BUT PROLONGED
LIFR CONDITIONS CAN`T BE RULED OUT DUE TO LOW CLOUDS AND FOG THAT
CONTINUES TO MIX AROUND THE VALLEY LOCATIONS.  THESE LOW CLOUDS
COULD LINGER AROUND UNTIL THE NEXT PUSH OF WIND ON SATURDAY EVENING
INTO SUNDAY SHOULD MIX IT OUT OF THE VALLEY AREAS.  WEBER

&&

.PREV DISC... /ISSUED 454 PM PST THU DEC 18 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  70  70  20  80
ALW  37  46  37  47 /  70  70  20  80
PSC  36  49  36  47 /  70  50  10  80
YKM  35  43  32  43 /  70  30  20  80
HRI  35  48  35  48 /  70  50  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  50  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  70  20  80
DLS  37  48  36  48 /  80  60  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94/89








000
FXUS66 KPDT 190342
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
744 PM PST THU DEC 18 2014

.SHORT TERM...FRONTAL BOUNDARY MOVING INTO THE PACIFIC NORTHWEST
THIS EVENING. SOME LIGHT RAIN AND HIGHER ELEVATION SNOW HAS BEEN
MOVING THROUGH THE REGION OVER THE PAST SEVERAL HOURS. SATELLITE
ENHANCEMENT ALONG THE COAST AND RADAR SUGGEST MORE WIDESPREAD
PRECIPITATION WILL OCCUR LATER TONIGHT INTO FRIDAY MORNING. LOW
CLOUDS AND FOG LIKELY IN THE COLUMBIA BASIN TONIGHT AS WELL. AS THE
FRONT MOVES EAST OF THE FORECAST AREA FRIDAY THE PRECIPITATION WILL
QUICKLY DIMINISH WITH SKIES REMAINING MOSTLY CLOUDY. NEXT SYSTEM TO
IMPACT THE PAC NW WILL BE A WARM FRONT FRIDAY NIGHT INTO SATURDAY.
THIS FRONT HAS FAIRLY SIGNIFICANT MOISTURE ASSOCIATED WITH IT AND A
PERIOD OF STEADY RAIN, POSSIBLY HEAVY AT TIMES IS LIKELY. SOUTHERLY
SURFACE GRADIENTS AND WINDS ALOFT WILL BE INCREASING SATURDAY
RESULTING IN BREEZY TO WINDY CONDITIONS BY AFTERNOON AND EVENING. 94

&&

.PREV DISC... /ISSUED 454 PM PST THU DEC 18 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

AVIATION...00Z TAFS...VFR CONDITIONS INITIALLY AT TAF SITES THIS
EVENING, EXCEPT MVFR CONDITIONS AT KYKM, KDLS AND KALW EXPECTED THIS
EVENING, MAINLY DUE TO LOW STRATUS. AT 442 PM, KPDT RADAR SHOWED
SCATTERED RAIN SHOWERS MOVING EAST ACROSS KHRI AND KPDT AND TOWARD
KALW. THESE SHOWERS SHOULD DISSIPATE BY 02Z-04Z. CONDITIONS WILL
DETERIORATE TO IFR/MVFR OVERNIGHT AS AN APPROACHING COLD FRONT
BRINGS RAIN STARTING AROUND 02Z/19TH AT KYKM AND KDLS, THEN -RA
STARTS AT KRDM AND KBDN BY 03Z/19TH. RAIN SPREADS TO OTHER TAF SITES
BY 06Z/19TH. SOME PERIODS OF LOCAL LIFR POSSIBLE UNDER MODERATE TO
HEAVY RAIN REDUCING VSBY. IMPROVING CONDITIONS WILL OCCUR FRIDAY
MORNING AS RAIN ENDS AT TAF SITES FROM WEST TO EAST, BEGINNING
AROUND 11Z-12Z/19TH AT KDLS AND KYKM, THEN ENDING AT KPSC AND KPDT
BY AROUND 16Z-19Z/19TH. WINDS WILL BE AOB 10 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  70  70  20  80
ALW  37  46  37  47 /  70  70  20  80
PSC  36  49  36  47 /  70  50  10  80
YKM  35  43  32  43 /  70  30  20  80
HRI  35  48  35  48 /  70  50  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  50  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  70  20  80
DLS  37  48  36  48 /  80  60  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94







000
FXUS66 KPDT 190342
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
744 PM PST THU DEC 18 2014

.SHORT TERM...FRONTAL BOUNDARY MOVING INTO THE PACIFIC NORTHWEST
THIS EVENING. SOME LIGHT RAIN AND HIGHER ELEVATION SNOW HAS BEEN
MOVING THROUGH THE REGION OVER THE PAST SEVERAL HOURS. SATELLITE
ENHANCEMENT ALONG THE COAST AND RADAR SUGGEST MORE WIDESPREAD
PRECIPITATION WILL OCCUR LATER TONIGHT INTO FRIDAY MORNING. LOW
CLOUDS AND FOG LIKELY IN THE COLUMBIA BASIN TONIGHT AS WELL. AS THE
FRONT MOVES EAST OF THE FORECAST AREA FRIDAY THE PRECIPITATION WILL
QUICKLY DIMINISH WITH SKIES REMAINING MOSTLY CLOUDY. NEXT SYSTEM TO
IMPACT THE PAC NW WILL BE A WARM FRONT FRIDAY NIGHT INTO SATURDAY.
THIS FRONT HAS FAIRLY SIGNIFICANT MOISTURE ASSOCIATED WITH IT AND A
PERIOD OF STEADY RAIN, POSSIBLY HEAVY AT TIMES IS LIKELY. SOUTHERLY
SURFACE GRADIENTS AND WINDS ALOFT WILL BE INCREASING SATURDAY
RESULTING IN BREEZY TO WINDY CONDITIONS BY AFTERNOON AND EVENING. 94

&&

.PREV DISC... /ISSUED 454 PM PST THU DEC 18 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

AVIATION...00Z TAFS...VFR CONDITIONS INITIALLY AT TAF SITES THIS
EVENING, EXCEPT MVFR CONDITIONS AT KYKM, KDLS AND KALW EXPECTED THIS
EVENING, MAINLY DUE TO LOW STRATUS. AT 442 PM, KPDT RADAR SHOWED
SCATTERED RAIN SHOWERS MOVING EAST ACROSS KHRI AND KPDT AND TOWARD
KALW. THESE SHOWERS SHOULD DISSIPATE BY 02Z-04Z. CONDITIONS WILL
DETERIORATE TO IFR/MVFR OVERNIGHT AS AN APPROACHING COLD FRONT
BRINGS RAIN STARTING AROUND 02Z/19TH AT KYKM AND KDLS, THEN -RA
STARTS AT KRDM AND KBDN BY 03Z/19TH. RAIN SPREADS TO OTHER TAF SITES
BY 06Z/19TH. SOME PERIODS OF LOCAL LIFR POSSIBLE UNDER MODERATE TO
HEAVY RAIN REDUCING VSBY. IMPROVING CONDITIONS WILL OCCUR FRIDAY
MORNING AS RAIN ENDS AT TAF SITES FROM WEST TO EAST, BEGINNING
AROUND 11Z-12Z/19TH AT KDLS AND KYKM, THEN ENDING AT KPSC AND KPDT
BY AROUND 16Z-19Z/19TH. WINDS WILL BE AOB 10 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  70  70  20  80
ALW  37  46  37  47 /  70  70  20  80
PSC  36  49  36  47 /  70  50  10  80
YKM  35  43  32  43 /  70  30  20  80
HRI  35  48  35  48 /  70  50  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  50  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  70  20  80
DLS  37  48  36  48 /  80  60  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94






000
FXUS66 KPDT 190342
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
744 PM PST THU DEC 18 2014

.SHORT TERM...FRONTAL BOUNDARY MOVING INTO THE PACIFIC NORTHWEST
THIS EVENING. SOME LIGHT RAIN AND HIGHER ELEVATION SNOW HAS BEEN
MOVING THROUGH THE REGION OVER THE PAST SEVERAL HOURS. SATELLITE
ENHANCEMENT ALONG THE COAST AND RADAR SUGGEST MORE WIDESPREAD
PRECIPITATION WILL OCCUR LATER TONIGHT INTO FRIDAY MORNING. LOW
CLOUDS AND FOG LIKELY IN THE COLUMBIA BASIN TONIGHT AS WELL. AS THE
FRONT MOVES EAST OF THE FORECAST AREA FRIDAY THE PRECIPITATION WILL
QUICKLY DIMINISH WITH SKIES REMAINING MOSTLY CLOUDY. NEXT SYSTEM TO
IMPACT THE PAC NW WILL BE A WARM FRONT FRIDAY NIGHT INTO SATURDAY.
THIS FRONT HAS FAIRLY SIGNIFICANT MOISTURE ASSOCIATED WITH IT AND A
PERIOD OF STEADY RAIN, POSSIBLY HEAVY AT TIMES IS LIKELY. SOUTHERLY
SURFACE GRADIENTS AND WINDS ALOFT WILL BE INCREASING SATURDAY
RESULTING IN BREEZY TO WINDY CONDITIONS BY AFTERNOON AND EVENING. 94

&&

.PREV DISC... /ISSUED 454 PM PST THU DEC 18 2014/

SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

AVIATION...00Z TAFS...VFR CONDITIONS INITIALLY AT TAF SITES THIS
EVENING, EXCEPT MVFR CONDITIONS AT KYKM, KDLS AND KALW EXPECTED THIS
EVENING, MAINLY DUE TO LOW STRATUS. AT 442 PM, KPDT RADAR SHOWED
SCATTERED RAIN SHOWERS MOVING EAST ACROSS KHRI AND KPDT AND TOWARD
KALW. THESE SHOWERS SHOULD DISSIPATE BY 02Z-04Z. CONDITIONS WILL
DETERIORATE TO IFR/MVFR OVERNIGHT AS AN APPROACHING COLD FRONT
BRINGS RAIN STARTING AROUND 02Z/19TH AT KYKM AND KDLS, THEN -RA
STARTS AT KRDM AND KBDN BY 03Z/19TH. RAIN SPREADS TO OTHER TAF SITES
BY 06Z/19TH. SOME PERIODS OF LOCAL LIFR POSSIBLE UNDER MODERATE TO
HEAVY RAIN REDUCING VSBY. IMPROVING CONDITIONS WILL OCCUR FRIDAY
MORNING AS RAIN ENDS AT TAF SITES FROM WEST TO EAST, BEGINNING
AROUND 11Z-12Z/19TH AT KDLS AND KYKM, THEN ENDING AT KPSC AND KPDT
BY AROUND 16Z-19Z/19TH. WINDS WILL BE AOB 10 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  70  70  20  80
ALW  37  46  37  47 /  70  70  20  80
PSC  36  49  36  47 /  70  50  10  80
YKM  35  43  32  43 /  70  30  20  80
HRI  35  48  35  48 /  70  50  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  50  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  70  20  80
DLS  37  48  36  48 /  80  60  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

94







000
FXUS66 KPDT 190054 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
454 PM PST THU DEC 18 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

.TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.AVIATION...00Z TAFS...VFR CONDITIONS INITIALLY AT TAF SITES THIS
EVENING, EXCEPT MVFR CONDITIONS AT KYKM, KDLS AND KALW EXPECTED THIS
EVENING, MAINLY DUE TO LOW STRATUS. AT 442 PM, KPDT RADAR SHOWED
SCATTERED RAIN SHOWERS MOVING EAST ACROSS KHRI AND KPDT AND TOWARD
KALW. THESE SHOWERS SHOULD DISSIPATE BY 02Z-04Z. CONDITIONS WILL
DETERIORATE TO IFR/MVFR OVERNIGHT AS AN APPROACHING COLD FRONT
BRINGS RAIN STARTING AROUND 02Z/19TH AT KYKM AND KDLS, THEN -RA
STARTS AT KRDM AND KBDN BY 03Z/19TH. RAIN SPREADS TO OTHER TAF SITES
BY 06Z/19TH. SOME PERIODS OF LOCAL LIFR POSSIBLE UNDER MODERATE TO
HEAVY RAIN REDUCING VSBY. IMPROVING CONDITIONS WILL OCCUR FRIDAY
MORNING AS RAIN ENDS AT TAF SITES FROM WEST TO EAST, BEGINNING
AROUND 11Z-12Z/19TH AT KDLS AND KYKM, THEN ENDING AT KPSC AND KPDT
BY AROUND 16Z-19Z/19TH. WINDS WILL BE AOB 10 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99








000
FXUS66 KPDT 190054 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
454 PM PST THU DEC 18 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

.TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.AVIATION...00Z TAFS...VFR CONDITIONS INITIALLY AT TAF SITES THIS
EVENING, EXCEPT MVFR CONDITIONS AT KYKM, KDLS AND KALW EXPECTED THIS
EVENING, MAINLY DUE TO LOW STRATUS. AT 442 PM, KPDT RADAR SHOWED
SCATTERED RAIN SHOWERS MOVING EAST ACROSS KHRI AND KPDT AND TOWARD
KALW. THESE SHOWERS SHOULD DISSIPATE BY 02Z-04Z. CONDITIONS WILL
DETERIORATE TO IFR/MVFR OVERNIGHT AS AN APPROACHING COLD FRONT
BRINGS RAIN STARTING AROUND 02Z/19TH AT KYKM AND KDLS, THEN -RA
STARTS AT KRDM AND KBDN BY 03Z/19TH. RAIN SPREADS TO OTHER TAF SITES
BY 06Z/19TH. SOME PERIODS OF LOCAL LIFR POSSIBLE UNDER MODERATE TO
HEAVY RAIN REDUCING VSBY. IMPROVING CONDITIONS WILL OCCUR FRIDAY
MORNING AS RAIN ENDS AT TAF SITES FROM WEST TO EAST, BEGINNING
AROUND 11Z-12Z/19TH AT KDLS AND KYKM, THEN ENDING AT KPSC AND KPDT
BY AROUND 16Z-19Z/19TH. WINDS WILL BE AOB 10 KTS.  POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99







000
FXUS66 KPDT 182303 CCA
AFDPDT

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
245 PM PST THU DEC 18 2014

RESEND OF FINAL FORECAST DISCUSSION

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

.TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.PREVIOUS AVIATION DISCUSSION...18Z TAFS...MVFR CONDITIONS WILL
OCCUR AT KYKM AND KDLS DUE TO LOW STRATUS. CONDITIONS SHOULD IMPROVE
THIS AFTERNOON. AN APPROACHING WEATHER SYSTEM WILL START TO SPREAD
RAIN AFTER 03Z/19TH TO ALL TAF SITES. CONDITIONS WILL DETERIORATE A
FEW HOURS AFTER 03Z/19TH TO IFR/MVFR, WITH SOME LIFR UNDER MODERATE
TO HEAVY RAIN. WINDS WILL BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.
POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99







000
FXUS66 KPDT 182303 CCA
AFDPDT

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE PENDLETON OR
245 PM PST THU DEC 18 2014

RESEND OF FINAL FORECAST DISCUSSION

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

.TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.PREVIOUS AVIATION DISCUSSION...18Z TAFS...MVFR CONDITIONS WILL
OCCUR AT KYKM AND KDLS DUE TO LOW STRATUS. CONDITIONS SHOULD IMPROVE
THIS AFTERNOON. AN APPROACHING WEATHER SYSTEM WILL START TO SPREAD
RAIN AFTER 03Z/19TH TO ALL TAF SITES. CONDITIONS WILL DETERIORATE A
FEW HOURS AFTER 03Z/19TH TO IFR/MVFR, WITH SOME LIFR UNDER MODERATE
TO HEAVY RAIN. WINDS WILL BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.
POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99








000
FXUS66 KPDT 182302
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
240 PM PST THU DEC 18 2014

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...

TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S. COBB

&&

.AVIATION...

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99








000
FXUS66 KPDT 182245
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
245 PM PST THU DEC 18 2014

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

.TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.PREVIOUS AVIATION DISCUSSION...18Z TAFS...MVFR CONDITIONS WILL
OCCUR AT KYKM AND KDLS DUE TO LOW STRATUS. CONDITIONS SHOULD IMPROVE
THIS AFTERNOON. AN APPROACHING WEATHER SYSTEM WILL START TO SPREAD
RAIN AFTER 03Z/19TH TO ALL TAF SITES. CONDITIONS WILL DETERIORATE A
FEW HOURS AFTER 03Z/19TH TO IFR/MVFR, WITH SOME LIFR UNDER MODERATE
TO HEAVY RAIN. WINDS WILL BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.
POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99









000
FXUS66 KPDT 182245
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
245 PM PST THU DEC 18 2014

.SHORT TERM...TONIGHT THROUGH FRIDAY NIGHT...PATCHY FOG LINGERS AT A
FEW LOCATIONS WITHIN THE COLUMBIA BASIN. DO NOT EXPECT THE FOG TO
EXPAND THIS EVENING DUE TO APPROACH AND PASSAGE OF THE NEXT PACIFIC
SYSTEM. THIS NEXT SYSTEM WILL BRING A GOOD SHOT OF PRECIP TO MOST OF
THE REGION TONIGHT INTO FRIDAY MORNING. GENERALLY SNOW LEVELS WILL
RUN BETWEEN 4000 AND 5000 FEET, BUT SNOW LEVELS WILL RUN AROUND 2500
FEET ALONG THE WASHINGTON CASCADE EAST SLOPES IN YAKIMA AND KITTITAS
COUNTIES. SNOW FALL OVERNIGHT AT AND ABOVE 2500 FEET IN THIS AREA
WILL RUN BETWEEN 2 AND 6 INCHES, WITH THE HIGHEST AMOUNTS NEAR THE
CREST. AS SUCH WILL ISSUE A SNOW ADVISORY. ELSEWHERE SNOW AMOUNTS
WILL MAINLY RUN 1-3 INCHES ABOVE THE SNOW LEVELS. WILL SEE BREEZY
CONDITIONS INCREASE TO THE 20 TO 30 MPH RANGE IN THE SOUTHERN GRANDE
RONDE VALLEY OVERNIGHT. PRECIP WILL GRADUALLY DECREASE ACROSS THE
AREA FROM LATE FRIDAY MORNING INTO FRIDAY EVENING. THE NEXT IN THE
SERIES OF PACIFIC STORMS WILL BEGIN TO PUSH PRECIP INTO THE AREA
LATE FRIDAY NIGHT. SNOW LEVELS WILL START OUT A BIT LOWER WITH THIS
SYSTEM AND SNOW HIGHLIGHTS MAY BE NEEDED UNTIL SNOW LEVELS RISE. 90

.LONG TERM...SATURDAY THROUGH MONDAY NIGHT...A VERY STRONG UPPER
LEVEL JET STREAM WILL BRING ABOVE NORMAL MOISTURE AND STRONG DYNAMIC
LIFT TO FORECAST AREA SATURDAY THROUGH MONDAY. THE JET STREAM WILL
USHER IN A WARM FRONT WITH DRAMATICALLY RISING SNOW LEVELS DURING
THE DAY ON SATURDAY RESULTING IN COPIOUS AMOUNTS OF RAIN FALLING ON
THE SNOWPACK IN THE MOUNTAINS. AS SUCH AREA RIVERS, STREAMS AND
CREEKS WILL RISE TO OR ABOVE BANKFULL IN SOME AREAS. AT A MINIMUM
2.00 INCHES OF RAIN ARE EXPECTED IN THE BLUE MOUNTAINS FOR THE 48
HOUR PERIOD FROM SUNUP ON SATURDAY THROUGH SUNUP ON MONDAY. LOWER
ELEVATIONS CAN EXPECT TO RECEIVE ANYWHERE FROM 0.40 TO 1.00 INCH OF
RAIN. SNOW LEVELS START EARLY SATURDAY MORNING AROUND 3500-4000 FEET
AND THEN RISE DRAMATICALLY TO AROUND 4500-5000 SATURDAY AFTERNOON.
SNOW LEVELS CONTINUE TO RISE IN RESPONSE TO THE WARM FRONT TO AROUND
6000 FEET ALONG THE EAST SLOPES IF THE WASHINGTON CASCADES BY
DAYBREAK ON SUNDAY, AND RISE TO AROUND 7000-8500 FEET IN THE
MOUNTAINS OF CENTRAL AND NORTHEAST OREGON. SNOW LEVELS REMAIN HIGH
PERSISTING AT THE AFOREMENTIONED LEVELS THROUGH SUNDAY NIGHT, AND
THEN LOWER TO 4500-6500 FEET DURING THE DAY ON MONDAY.  POLAN

.TUESDAY THROUGH THURSDAY...A RIDGE OF HIGH PRESSURE OVER THE AREA
WILL BEGIN TO BREAK DOWN ON TUESDAY. DAYTIME HIGHS WILL BE IN THE
40S TO LOWER 50S AS A WEAK DISTURBANCE BRINGS A CHANCE OF RAIN AND
HIGH MOUNTAIN SNOW. A STRONGER SHORTWAVE WILL THEN SWING THROUGH THE
AREA ON WEDNESDAY BRINGING MORE PRECIPITATION ALONG WITH A COLD
FRONT. SNOW LEVELS SUBSEQUENTLY WILL LOWER TO THE BASIN FLOOR ON
WEDNESDAY NIGHT. HOWEVER, BY THE TIME THE COLDER AIR ARRIVES,
PRECIPITATION WILL BE DIMINISHING AND ONLY LIGHT SNOW SHOWERS ARE
EXPECTED ON CHRISTMAS MORNING. ON THURSDAY, NORTHWESTERLY FLOW ALOFT
WILL KEEP CONDITIONS COOL WITH DAYTIME TEMPERATURES IN THE 30S, AND
CLEARING SKIES THURSDAY NIGHT WILL ALLOW TEMPERATURES TO DROP INTO
THE TEENS AND LOW 20S.  COBB

&&

.PREVIOUS AVIATION DISCUSSION...18Z TAFS...MVFR CONDITIONS WILL
OCCUR AT KYKM AND KDLS DUE TO LOW STRATUS. CONDITIONS SHOULD IMPROVE
THIS AFTERNOON. AN APPROACHING WEATHER SYSTEM WILL START TO SPREAD
RAIN AFTER 03Z/19TH TO ALL TAF SITES. CONDITIONS WILL DETERIORATE A
FEW HOURS AFTER 03Z/19TH TO IFR/MVFR, WITH SOME LIFR UNDER MODERATE
TO HEAVY RAIN. WINDS WILL BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.
POLAN

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  35  46  35  47 /  60  70  20  80
ALW  37  46  37  47 /  70  80  20  80
PSC  36  49  36  47 /  70  60  10  80
YKM  35  43  32  43 /  60  40  20  80
HRI  35  48  35  48 /  60  60  20  80
ELN  33  42  31  43 /  70  40  20  80
RDM  34  46  33  47 /  70  60  30  80
LGD  37  44  34  46 /  70  80  20  90
GCD  34  45  33  46 /  80  80  20  80
DLS  37  48  36  48 /  70  70  30  90

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

     WINTER WEATHER ADVISORY UNTIL 7 AM PST FRIDAY ABOVE 2500 FEET
     FOR THE WAZ520.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/82/99










000
FXUS66 KPDT 181855 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1050 AM PST THU DEC 18 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...MORNING UPDATE...THE AIR MASS ACROSS THE BASIN
CONTINUES TO BECOME INCREASINGLY MIXED DUE TO THE PASSAGE OF WEAK
SYSTEMS. FOG IS PATCHY AT MOST ACROSS THE BASIN THIS MORNING, AND
EXPECT SOME PATCHES TO LINGER THROUGH THE DAY. STILL COVERAGE IS NOT
EXPECTED TO BECOME WIDESPREAD IN ANY AREA, THUS DO NOT EXPECT ANY
NEW FOG ADVISORIES AT THIS TIME. ALSO WILL ALLOW THE AIR STAGNATION
ADVISORY TO CONTINUE TO IT`S CURRENT EXPECTED END TIME TOMORROW
MORNING. ANOTHER WEAK SYSTEM IS MOVING THROUGH THE REGION AND WILL
CONTINUE TO PRODUCE SPOTTY SHOWERS. A MORE VIGOROUS SYSTEM IS
APPROACHING THE COAST. EXPECT TO SEE AN INCREASE IN SHOWER CHANCES
OVER CENTRAL AND NORTH-CENTRAL OREGON THIS AFTERNOON, AND INCREASED
POPS. THIS SYSTEM WILL MOVE ACROSS THE AREA TONIGHT, BRINGING PRECIP
TO MOST LOCATIONS. SNOW LEVELS LOOK TO MAINLY RUN BETWEEN 4000 AND
5000 FEET WITH THIS SYSTEM, THOUGH THEY COULD BE AS LOW AS 2500 FEET
OVER WESTERN KITTITAS COUNTY. 90

.AVIATION...18Z TAFS...MVFR CONDITIONS WILL OCCUR AT KYKM AND KDLS
DUE TO LOW STRATUS. CONDITIONS SHOULD IMPROVE THIS AFTERNOON. AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFTER 03Z/19TH
TO ALL TAF SITES. CONDITIONS WILL DETERIORATE A FEW HOURS AFTER
03Z/19TH TO IFR/MVFR, WITH SOME LIFR UNDER MODERATE TO HEAVY RAIN.
WINDS WILL BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  POLAN

&&

.LONG TERM...PREVIOUS DISCUSSION...AN ACTIVE WEATHER PATTERN IS
EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL STORM SYSTEMS SET
TO IMPACT THE AREA. A 150 KT ZONAL JET IS EXPECTED TO LINE UP WITH
THE PACIFIC NORTHWEST SUNDAY AND MONDAY. THE RIGHT JET EXIT
REGION...SYNONYMOUS WITH SINKING AIR...IS PRESENTLY PROGGED TO BE
OVER THE CWA SUNDAY AND MONDAY WITH THE POTENTIAL FOR A LEE SIDE
TROUGH TO SETUP DOWNWIND OF THE CASCADES. THEREFORE...CONCERN EXISTS
FOR A HIGH WIND EVENT BUT TIMING FROM RECENT MODEL RUNS HAS DELAYED
THE POTENTIAL START OF THE EVENT TO SUNDAY NIGHT INTO MONDAY. WILL
CONTINUE TO MONITOR OR THE POTENTIAL FOR HIGH WINDS ACROSS THE CWA
AND HAVE CHANGED THE FORECAST TO INDICATE STRONGEST WIND POTENTIAL
INTO MIDDAY SUNDAY INTO EARLY MONDAY TIMEFRAME. THE OTHER ITEM OF
NOTE DURING THE UPCOMING WEEKEND IS THE POTENTIAL FOR A STEADY
STREAM OF MOISTURE INTO THE AREA WITH RAINFALL SATURDAY NIGHT THRU
MONDAY THAT CAN BE HEAVY AT TIMES. QPF TOTALS COULD BE IN EXCESS OF
2 INCHES IN THE MOUNTAINS WITH BETWEEN A QUARTER TO HALF AN INCH IN
LOW LYING AREAS. GIVEN THE STRONG WINDS AND A WARM FRONT EXPECTED TO
MOVE IN SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER
50S IN THE COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS. THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA. SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY. A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED. THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  42  33  43  35 /  10  60  70  20
ALW  43  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  41  33  44  32 /  20  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  39  33  43  32 /  20  70  60  10
RDM  46  32  47  31 /  30  60  60  20
LGD  46  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  45  37  48  39 /  20  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/98








000
FXUS66 KPDT 181855 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
1050 AM PST THU DEC 18 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...MORNING UPDATE...THE AIR MASS ACROSS THE BASIN
CONTINUES TO BECOME INCREASINGLY MIXED DUE TO THE PASSAGE OF WEAK
SYSTEMS. FOG IS PATCHY AT MOST ACROSS THE BASIN THIS MORNING, AND
EXPECT SOME PATCHES TO LINGER THROUGH THE DAY. STILL COVERAGE IS NOT
EXPECTED TO BECOME WIDESPREAD IN ANY AREA, THUS DO NOT EXPECT ANY
NEW FOG ADVISORIES AT THIS TIME. ALSO WILL ALLOW THE AIR STAGNATION
ADVISORY TO CONTINUE TO IT`S CURRENT EXPECTED END TIME TOMORROW
MORNING. ANOTHER WEAK SYSTEM IS MOVING THROUGH THE REGION AND WILL
CONTINUE TO PRODUCE SPOTTY SHOWERS. A MORE VIGOROUS SYSTEM IS
APPROACHING THE COAST. EXPECT TO SEE AN INCREASE IN SHOWER CHANCES
OVER CENTRAL AND NORTH-CENTRAL OREGON THIS AFTERNOON, AND INCREASED
POPS. THIS SYSTEM WILL MOVE ACROSS THE AREA TONIGHT, BRINGING PRECIP
TO MOST LOCATIONS. SNOW LEVELS LOOK TO MAINLY RUN BETWEEN 4000 AND
5000 FEET WITH THIS SYSTEM, THOUGH THEY COULD BE AS LOW AS 2500 FEET
OVER WESTERN KITTITAS COUNTY. 90

.AVIATION...18Z TAFS...MVFR CONDITIONS WILL OCCUR AT KYKM AND KDLS
DUE TO LOW STRATUS. CONDITIONS SHOULD IMPROVE THIS AFTERNOON. AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFTER 03Z/19TH
TO ALL TAF SITES. CONDITIONS WILL DETERIORATE A FEW HOURS AFTER
03Z/19TH TO IFR/MVFR, WITH SOME LIFR UNDER MODERATE TO HEAVY RAIN.
WINDS WILL BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  POLAN

&&

.LONG TERM...PREVIOUS DISCUSSION...AN ACTIVE WEATHER PATTERN IS
EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL STORM SYSTEMS SET
TO IMPACT THE AREA. A 150 KT ZONAL JET IS EXPECTED TO LINE UP WITH
THE PACIFIC NORTHWEST SUNDAY AND MONDAY. THE RIGHT JET EXIT
REGION...SYNONYMOUS WITH SINKING AIR...IS PRESENTLY PROGGED TO BE
OVER THE CWA SUNDAY AND MONDAY WITH THE POTENTIAL FOR A LEE SIDE
TROUGH TO SETUP DOWNWIND OF THE CASCADES. THEREFORE...CONCERN EXISTS
FOR A HIGH WIND EVENT BUT TIMING FROM RECENT MODEL RUNS HAS DELAYED
THE POTENTIAL START OF THE EVENT TO SUNDAY NIGHT INTO MONDAY. WILL
CONTINUE TO MONITOR OR THE POTENTIAL FOR HIGH WINDS ACROSS THE CWA
AND HAVE CHANGED THE FORECAST TO INDICATE STRONGEST WIND POTENTIAL
INTO MIDDAY SUNDAY INTO EARLY MONDAY TIMEFRAME. THE OTHER ITEM OF
NOTE DURING THE UPCOMING WEEKEND IS THE POTENTIAL FOR A STEADY
STREAM OF MOISTURE INTO THE AREA WITH RAINFALL SATURDAY NIGHT THRU
MONDAY THAT CAN BE HEAVY AT TIMES. QPF TOTALS COULD BE IN EXCESS OF
2 INCHES IN THE MOUNTAINS WITH BETWEEN A QUARTER TO HALF AN INCH IN
LOW LYING AREAS. GIVEN THE STRONG WINDS AND A WARM FRONT EXPECTED TO
MOVE IN SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER
50S IN THE COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS. THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA. SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY. A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED. THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  42  33  43  35 /  10  60  70  20
ALW  43  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  41  33  44  32 /  20  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  39  33  43  32 /  20  70  60  10
RDM  46  32  47  31 /  30  60  60  20
LGD  46  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  45  37  48  39 /  20  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/98







000
FXUS66 KPDT 181737
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
937 AM PST THU DEC 18 2014

.SHORT TERM...MORNING UPDATE...THE AIR MASS ACROSS THE BASIN
CONTINUES TO BECOME INCREASINGLY MIXED DUE TO THE PASSAGE OF WEAK
SYSTEMS. FOG IS PATCHY AT MOST ACROSS THE BASIN THIS MORNING, AND
EXPECT SOME PATCHES TO LINGER THROUGH THE DAY. STILL COVERAGE IS NOT
EXPECTED TO BECOME WIDESPREAD IN ANY AREA, THUS DO NOT EXPECT ANY
NEW FOG ADVISORIES AT THIS TIME. ALSO WILL ALLOW THE AIR STAGNATION
ADVISORY TO CONTINUE TO IT`S CURRENT EXPECTED END TIME TOMORROW
MORNING. ANOTHER WEAK SYSTEM IS MOVING THROUGH THE REGION AND WILL
CONTINUE TO PRODUCE SPOTTY SHOWERS. A MORE VIGOROUS SYSTEM IS
APPROACHING THE COAST. EXPECT TO SEE AN INCREASE IN SHOWER CHANCES
OVER CENTRAL AND NORTH-CENTRAL OREGON THIS AFTERNOON, AND INCREASED
POPS. THIS SYSTEM WILL MOVE ACROSS THE AREA TONIGHT, BRINGING PRECIP
TO MOST LOCATIONS. SNOW LEVELS LOOK TO MAINLY RUN BETWEEN 4000 AND
5000 FEET WITH THIS SYSTEM, THOUGH THEY COULD BE AS LOW AS 2500 FEET
OVER WESTERN KITTITAS COUNTY. 90

.LONG TERM...PREVIOUS DISCUSSION...AN ACTIVE WEATHER PATTERN IS
EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL STORM SYSTEMS SET
TO IMPACT THE AREA. A 150 KT ZONAL JET IS EXPECTED TO LINE UP WITH
THE PACIFIC NORTHWEST SUNDAY AND MONDAY. THE RIGHT JET EXIT
REGION...SYNONYMOUS WITH SINKING AIR...IS PRESENTLY PROGGED TO BE
OVER THE CWA SUNDAY AND MONDAY WITH THE POTENTIAL FOR A LEE SIDE
TROUGH TO SETUP DOWNWIND OF THE CASCADES. THEREFORE...CONCERN EXISTS
FOR A HIGH WIND EVENT BUT TIMING FROM RECENT MODEL RUNS HAS DELAYED
THE POTENTIAL START OF THE EVENT TO SUNDAY NIGHT INTO MONDAY. WILL
CONTINUE TO MONITOR OR THE POTENTIAL FOR HIGH WINDS ACROSS THE CWA
AND HAVE CHANGED THE FORECAST TO INDICATE STRONGEST WIND POTENTIAL
INTO MIDDAY SUNDAY INTO EARLY MONDAY TIMEFRAME. THE OTHER ITEM OF
NOTE DURING THE UPCOMING WEEKEND IS THE POTENTIAL FOR A STEADY
STREAM OF MOISTURE INTO THE AREA WITH RAINFALL SATURDAY NIGHT THRU
MONDAY THAT CAN BE HEAVY AT TIMES. QPF TOTALS COULD BE IN EXCESS OF
2 INCHES IN THE MOUNTAINS WITH BETWEEN A QUARTER TO HALF AN INCH IN
LOW LYING AREAS. GIVEN THE STRONG WINDS AND A WARM FRONT EXPECTED TO
MOVE IN SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER
50S IN THE COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS. THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA. SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY. A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED. THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.

&&

.AVIATION...PREVIOUS DISCUSSION...12Z TAFS...IFR/MVFR CONDITIONS
WILL PREVAIL AT KDLS...KPDT AND KALW DUE TO LOW STRATUS AND FOG WITH
AT WORST MVFR CONDITIONS AT ALL OTHER TAF SITES DUE TO LOW CLOUDS
THRU 18Z. AFTERWARDS...CONDITIONS SHOULD IMPROVE DURING THE DAY BUT
AN APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFT 19/03Z
TO ALL TAF SITES. CONDITIONS WILL DETERIORATE AFT 19/03Z DOWN TO
IFR/MVFR...WITH OCNL LIFR UNDER HEAVIER RAIN ACTIVITY. WINDS WILL BE
AOB 10 KTS THROUGHOUT THE TAF PERIOD.

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  42  33  43  35 /  10  60  70  20
ALW  43  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  41  33  44  32 /  20  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  39  33  43  32 /  20  70  60  10
RDM  46  32  47  31 /  30  60  60  20
LGD  46  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  45  37  48  39 /  20  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.
WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/98/99










000
FXUS66 KPDT 181150 AAB
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
350 AM PST THU DEC 18 2014

CANCELLED THE DENSE FOG ADVISORY

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG. AN AIR STAGNATION ADVISORY
REMAINS IN EFFECT TODAY INTO MOST OF FRIDAY FOR THE LOWER COLUMBIA
BASIN OF WASHINGTON AND THE YAKIMA/KITTITAS VALLEYS. THE NEXT
WEATHER SYSTEM WILL BEGIN TO PUSH MOISTURE INTO THE CWA BEGINNING
TONIGHT WITH RAIN AND HIGHER MOUNTAIN SNOW DEVELOPING FROM WEST TO
EAST OVERNIGHT. BY FRIDAY MORNING THE ENTIRE CWA WILL BE IN THE
LIKELY CATEGORY FOR RAIN AND HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL
BE WETTER THAN THE ONE THAT JUST MOVED THROUGH THE CWA AND EXPECT
POSSIBLE HEAVY RAIN IN THE HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE
HIGH ENOUGH TO NEGATE THE NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR
LATE TONIGHT OR FRIDAY. STILL COULD SEE SEVERAL INCHES IN THE HIGHER
MOUNTAINS IN SUCH AREAS AS MEACHAM AND TOLLGATE AND THE CASCADE EAST
SLOPES. THERE WILL BE ANOTHER TEMPORARY BREAK IN THE ACTION ON
FRIDAY NIGHT AND THEN A STRONGER SYSTEM WILL GET READY TO MOVE IN ON
SATURDAY. THE BRUNT OF THIS NEXT SYSTEM WILL HAVE THE GREATEST
IMPACTS IN THE EXTENDED PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL
EXPECT INCREASING RAIN AND ALSO INCREASING WINDS WITH THIS NEXT
SYSTEM BY SATURDAY NIGHT. IN THE MEAN TIME EXPECT CLOUDY SKIES AND
WARMING TEMPERATURES THROUGH THE SHORT TERM PERIOD WITH SNOW LEVELS
INCREASING A LITTLE EACH DAY. 88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...12Z TAFS...IFR/MVFR CONDITIONS WILL PREVAIL AT
KDLS...KPDT AND KALW DUE TO LOW STRATUS AND FOG WITH AT WORST MVFR
CONDITIONS AT ALL OTHER TAF SITES DUE TO LOW CLOUDS THRU 18Z.
AFTERWARDS...CONDITIONS SHOULD IMPROVE DURING THE DAY BUT AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFT 19/03Z TO
ALL TAF SITES.  CONDITIONS WILL DETERIORATE AFT 19/03Z DOWN TO
IFR/MVFR...WITH OCNL LIFR UNDER HEAVIER RAIN ACTIVITY.  WINDS WILL
BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76








000
FXUS66 KPDT 181150 AAB
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
350 AM PST THU DEC 18 2014

CANCELLED THE DENSE FOG ADVISORY

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG. AN AIR STAGNATION ADVISORY
REMAINS IN EFFECT TODAY INTO MOST OF FRIDAY FOR THE LOWER COLUMBIA
BASIN OF WASHINGTON AND THE YAKIMA/KITTITAS VALLEYS. THE NEXT
WEATHER SYSTEM WILL BEGIN TO PUSH MOISTURE INTO THE CWA BEGINNING
TONIGHT WITH RAIN AND HIGHER MOUNTAIN SNOW DEVELOPING FROM WEST TO
EAST OVERNIGHT. BY FRIDAY MORNING THE ENTIRE CWA WILL BE IN THE
LIKELY CATEGORY FOR RAIN AND HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL
BE WETTER THAN THE ONE THAT JUST MOVED THROUGH THE CWA AND EXPECT
POSSIBLE HEAVY RAIN IN THE HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE
HIGH ENOUGH TO NEGATE THE NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR
LATE TONIGHT OR FRIDAY. STILL COULD SEE SEVERAL INCHES IN THE HIGHER
MOUNTAINS IN SUCH AREAS AS MEACHAM AND TOLLGATE AND THE CASCADE EAST
SLOPES. THERE WILL BE ANOTHER TEMPORARY BREAK IN THE ACTION ON
FRIDAY NIGHT AND THEN A STRONGER SYSTEM WILL GET READY TO MOVE IN ON
SATURDAY. THE BRUNT OF THIS NEXT SYSTEM WILL HAVE THE GREATEST
IMPACTS IN THE EXTENDED PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL
EXPECT INCREASING RAIN AND ALSO INCREASING WINDS WITH THIS NEXT
SYSTEM BY SATURDAY NIGHT. IN THE MEAN TIME EXPECT CLOUDY SKIES AND
WARMING TEMPERATURES THROUGH THE SHORT TERM PERIOD WITH SNOW LEVELS
INCREASING A LITTLE EACH DAY. 88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...12Z TAFS...IFR/MVFR CONDITIONS WILL PREVAIL AT
KDLS...KPDT AND KALW DUE TO LOW STRATUS AND FOG WITH AT WORST MVFR
CONDITIONS AT ALL OTHER TAF SITES DUE TO LOW CLOUDS THRU 18Z.
AFTERWARDS...CONDITIONS SHOULD IMPROVE DURING THE DAY BUT AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFT 19/03Z TO
ALL TAF SITES.  CONDITIONS WILL DETERIORATE AFT 19/03Z DOWN TO
IFR/MVFR...WITH OCNL LIFR UNDER HEAVIER RAIN ACTIVITY.  WINDS WILL
BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76








000
FXUS66 KPDT 181150 AAB
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
350 AM PST THU DEC 18 2014

CANCELLED THE DENSE FOG ADVISORY

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG. AN AIR STAGNATION ADVISORY
REMAINS IN EFFECT TODAY INTO MOST OF FRIDAY FOR THE LOWER COLUMBIA
BASIN OF WASHINGTON AND THE YAKIMA/KITTITAS VALLEYS. THE NEXT
WEATHER SYSTEM WILL BEGIN TO PUSH MOISTURE INTO THE CWA BEGINNING
TONIGHT WITH RAIN AND HIGHER MOUNTAIN SNOW DEVELOPING FROM WEST TO
EAST OVERNIGHT. BY FRIDAY MORNING THE ENTIRE CWA WILL BE IN THE
LIKELY CATEGORY FOR RAIN AND HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL
BE WETTER THAN THE ONE THAT JUST MOVED THROUGH THE CWA AND EXPECT
POSSIBLE HEAVY RAIN IN THE HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE
HIGH ENOUGH TO NEGATE THE NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR
LATE TONIGHT OR FRIDAY. STILL COULD SEE SEVERAL INCHES IN THE HIGHER
MOUNTAINS IN SUCH AREAS AS MEACHAM AND TOLLGATE AND THE CASCADE EAST
SLOPES. THERE WILL BE ANOTHER TEMPORARY BREAK IN THE ACTION ON
FRIDAY NIGHT AND THEN A STRONGER SYSTEM WILL GET READY TO MOVE IN ON
SATURDAY. THE BRUNT OF THIS NEXT SYSTEM WILL HAVE THE GREATEST
IMPACTS IN THE EXTENDED PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL
EXPECT INCREASING RAIN AND ALSO INCREASING WINDS WITH THIS NEXT
SYSTEM BY SATURDAY NIGHT. IN THE MEAN TIME EXPECT CLOUDY SKIES AND
WARMING TEMPERATURES THROUGH THE SHORT TERM PERIOD WITH SNOW LEVELS
INCREASING A LITTLE EACH DAY. 88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...12Z TAFS...IFR/MVFR CONDITIONS WILL PREVAIL AT
KDLS...KPDT AND KALW DUE TO LOW STRATUS AND FOG WITH AT WORST MVFR
CONDITIONS AT ALL OTHER TAF SITES DUE TO LOW CLOUDS THRU 18Z.
AFTERWARDS...CONDITIONS SHOULD IMPROVE DURING THE DAY BUT AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFT 19/03Z TO
ALL TAF SITES.  CONDITIONS WILL DETERIORATE AFT 19/03Z DOWN TO
IFR/MVFR...WITH OCNL LIFR UNDER HEAVIER RAIN ACTIVITY.  WINDS WILL
BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...NONE.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76







000
FXUS66 KPDT 181132 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
333 AM PST THU DEC 18 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG...LOCALLY DENSE ALONG THE
FOOTHILLS AND KITTITAS VALLEY...THIS MORNING. A DENSE FOG ADVISORY
IS CURRENTLY IN EFFECT FOR THESE AREAS UNTIL AT LEAST 10 AM THIS
MORNING. AN AIR STAGNATION ADVISORY REMAINS IN EFFECT TODAY INTO
MOST OF FRIDAY FOR THE LOWER COLUMBIA BASIN OF WASHINGTON AND THE
YAKIMA/KITTITAS VALLEYS. THE NEXT WEATHER SYSTEM WILL BEGIN TO PUSH
MOISTURE INTO THE CWA BEGINNING TONIGHT WITH RAIN AND HIGHER
MOUNTAIN SNOW DEVELOPING FROM WEST TO EAST OVERNIGHT. BY FRIDAY
MORNING THE ENTIRE CWA WILL BE IN THE LIKELY CATEGORY FOR RAIN AND
HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL BE WETTER THAN THE ONE THAT
JUST MOVED THROUGH THE CWA AND EXPECT POSSIBLE HEAVY RAIN IN THE
HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE HIGH ENOUGH TO NEGATE THE
NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR LATE TONIGHT OR FRIDAY.
STILL COULD SEE SEVERAL INCHES IN THE HIGHER MOUNTAINS IN SUCH AREAS
AS MEACHAM AND TOLLGATE AND THE CASCADE EAST SLOPES. THERE WILL BE
ANOTHER TEMPORARY BREAK IN THE ACTION ON FRIDAY NIGHT AND THEN A
STRONGER SYSTEM WILL GET READY TO MOVE IN ON SATURDAY. THE BRUNT OF
THIS NEXT SYSTEM WILL HAVE THE GREATEST IMPACTS IN THE EXTENDED
PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL EXPECT INCREASING RAIN AND
ALSO INCREASING WINDS WITH THIS NEXT SYSTEM BY SATURDAY NIGHT. IN
THE MEAN TIME EXPECT CLOUDY SKIES AND WARMING TEMPERATURES THROUGH
THE SHORT TERM PERIOD WITH SNOW LEVELS INCREASING A LITTLE EACH DAY.
88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...12Z TAFS...IFR/MVFR CONDITIONS WILL PREVAIL AT
KDLS...KPDT AND KALW DUE TO LOW STRATUS AND FOG WITH AT WORST MVFR
CONDITIONS AT ALL OTHER TAF SITES DUE TO LOW CLOUDS THRU 18Z.
AFTERWARDS...CONDITIONS SHOULD IMPROVE DURING THE DAY BUT AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFT 19/03Z TO
ALL TAF SITES.  CONDITIONS WILL DETERIORATE AFT 19/03Z DOWN TO
IFR/MVFR...WITH OCNL LIFR UNDER HEAVIER RAIN ACTIVITY.  WINDS WILL
BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76







000
FXUS66 KPDT 181132 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
333 AM PST THU DEC 18 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG...LOCALLY DENSE ALONG THE
FOOTHILLS AND KITTITAS VALLEY...THIS MORNING. A DENSE FOG ADVISORY
IS CURRENTLY IN EFFECT FOR THESE AREAS UNTIL AT LEAST 10 AM THIS
MORNING. AN AIR STAGNATION ADVISORY REMAINS IN EFFECT TODAY INTO
MOST OF FRIDAY FOR THE LOWER COLUMBIA BASIN OF WASHINGTON AND THE
YAKIMA/KITTITAS VALLEYS. THE NEXT WEATHER SYSTEM WILL BEGIN TO PUSH
MOISTURE INTO THE CWA BEGINNING TONIGHT WITH RAIN AND HIGHER
MOUNTAIN SNOW DEVELOPING FROM WEST TO EAST OVERNIGHT. BY FRIDAY
MORNING THE ENTIRE CWA WILL BE IN THE LIKELY CATEGORY FOR RAIN AND
HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL BE WETTER THAN THE ONE THAT
JUST MOVED THROUGH THE CWA AND EXPECT POSSIBLE HEAVY RAIN IN THE
HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE HIGH ENOUGH TO NEGATE THE
NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR LATE TONIGHT OR FRIDAY.
STILL COULD SEE SEVERAL INCHES IN THE HIGHER MOUNTAINS IN SUCH AREAS
AS MEACHAM AND TOLLGATE AND THE CASCADE EAST SLOPES. THERE WILL BE
ANOTHER TEMPORARY BREAK IN THE ACTION ON FRIDAY NIGHT AND THEN A
STRONGER SYSTEM WILL GET READY TO MOVE IN ON SATURDAY. THE BRUNT OF
THIS NEXT SYSTEM WILL HAVE THE GREATEST IMPACTS IN THE EXTENDED
PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL EXPECT INCREASING RAIN AND
ALSO INCREASING WINDS WITH THIS NEXT SYSTEM BY SATURDAY NIGHT. IN
THE MEAN TIME EXPECT CLOUDY SKIES AND WARMING TEMPERATURES THROUGH
THE SHORT TERM PERIOD WITH SNOW LEVELS INCREASING A LITTLE EACH DAY.
88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...12Z TAFS...IFR/MVFR CONDITIONS WILL PREVAIL AT
KDLS...KPDT AND KALW DUE TO LOW STRATUS AND FOG WITH AT WORST MVFR
CONDITIONS AT ALL OTHER TAF SITES DUE TO LOW CLOUDS THRU 18Z.
AFTERWARDS...CONDITIONS SHOULD IMPROVE DURING THE DAY BUT AN
APPROACHING WEATHER SYSTEM WILL START TO SPREAD RAIN AFT 19/03Z TO
ALL TAF SITES.  CONDITIONS WILL DETERIORATE AFT 19/03Z DOWN TO
IFR/MVFR...WITH OCNL LIFR UNDER HEAVIER RAIN ACTIVITY.  WINDS WILL
BE AOB 10 KTS THROUGHOUT THE TAF PERIOD.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76








000
FXUS66 KPDT 181025
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
225 AM PST THU DEC 18 2014

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG...LOCALLY DENSE ALONG THE
FOOTHILLS AND KITTITAS VALLEY...THIS MORNING. A DENSE FOG ADVISORY
IS CURRENTLY IN EFFECT FOR THESE AREAS UNTIL AT LEAST 10 AM THIS
MORNING. AN AIR STAGNATION ADVISORY REMAINS IN EFFECT TODAY INTO
MOST OF FRIDAY FOR THE LOWER COLUMBIA BASIN OF WASHINGTON AND THE
YAKIMA/KITTITAS VALLEYS. THE NEXT WEATHER SYSTEM WILL BEGIN TO PUSH
MOISTURE INTO THE CWA BEGINNING TONIGHT WITH RAIN AND HIGHER
MOUNTAIN SNOW DEVELOPING FROM WEST TO EAST OVERNIGHT. BY FRIDAY
MORNING THE ENTIRE CWA WILL BE IN THE LIKELY CATEGORY FOR RAIN AND
HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL BE WETTER THAN THE ONE THAT
JUST MOVED THROUGH THE CWA AND EXPECT POSSIBLE HEAVY RAIN IN THE
HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE HIGH ENOUGH TO NEGATE THE
NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR LATE TONIGHT OR FRIDAY.
STILL COULD SEE SEVERAL INCHES IN THE HIGHER MOUNTAINS IN SUCH AREAS
AS MEACHAM AND TOLLGATE AND THE CASCADE EAST SLOPES. THERE WILL BE
ANOTHER TEMPORARY BREAK IN THE ACTION ON FRIDAY NIGHT AND THEN A
STRONGER SYSTEM WILL GET READY TO MOVE IN ON SATURDAY. THE BRUNT OF
THIS NEXT SYSTEM WILL HAVE THE GREATEST IMPACTS IN THE EXTENDED
PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL EXPECT INCREASING RAIN AND
ALSO INCREASING WINDS WITH THIS NEXT SYSTEM BY SATURDAY NIGHT. IN
THE MEAN TIME EXPECT CLOUDY SKIES AND WARMING TEMPERATURES THROUGH
THE SHORT TERM PERIOD WITH SNOW LEVELS INCREASING A LITTLE EACH DAY.
88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...PREVIOUS DISCUSSION...06Z TAFS...IFR/LIFR CONDITIONS
WILL PREVAIL AT KPDT AND KALW. MVFR CONDITIONS WILL PREVAIL AT OTHER
TAF SITES WITH OCCASIONAL IFR CIGS UNTIL 18Z. THESE CONDITIONS WILL
CONTINUE INTO THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT
POSSIBLE AFTER 18Z THURSDAY. WINDS WILL BE LIGHT. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76









000
FXUS66 KPDT 181025
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
225 AM PST THU DEC 18 2014

.SHORT TERM...TODAY THROUGH SATURDAY...A WEAK WEATHER DISTURBANCE IS
PULLING OUT OF THE AREA THIS MORNING WITH A WEAK UPPER RIDGE TO
BUILD OVER THE REGION TODAY. THIS WILL BRING A TEMPORARY BREAK IN
THE PRECIPITATION TO THE CWA FOR TODAY. WINDS WILL REMAIN LIGHT AND
STAGNANT AIR CONDITIONS WITH PATCHY FOG...LOCALLY DENSE ALONG THE
FOOTHILLS AND KITTITAS VALLEY...THIS MORNING. A DENSE FOG ADVISORY
IS CURRENTLY IN EFFECT FOR THESE AREAS UNTIL AT LEAST 10 AM THIS
MORNING. AN AIR STAGNATION ADVISORY REMAINS IN EFFECT TODAY INTO
MOST OF FRIDAY FOR THE LOWER COLUMBIA BASIN OF WASHINGTON AND THE
YAKIMA/KITTITAS VALLEYS. THE NEXT WEATHER SYSTEM WILL BEGIN TO PUSH
MOISTURE INTO THE CWA BEGINNING TONIGHT WITH RAIN AND HIGHER
MOUNTAIN SNOW DEVELOPING FROM WEST TO EAST OVERNIGHT. BY FRIDAY
MORNING THE ENTIRE CWA WILL BE IN THE LIKELY CATEGORY FOR RAIN AND
HIGHER MOUNTAIN SNOW. THIS SYSTEM WILL BE WETTER THAN THE ONE THAT
JUST MOVED THROUGH THE CWA AND EXPECT POSSIBLE HEAVY RAIN IN THE
HIGHER ELEVATIONS. SNOW LEVELS SHOULD BE HIGH ENOUGH TO NEGATE THE
NEED OF ANY WINTER WEATHER HIGHLIGHTS FOR LATE TONIGHT OR FRIDAY.
STILL COULD SEE SEVERAL INCHES IN THE HIGHER MOUNTAINS IN SUCH AREAS
AS MEACHAM AND TOLLGATE AND THE CASCADE EAST SLOPES. THERE WILL BE
ANOTHER TEMPORARY BREAK IN THE ACTION ON FRIDAY NIGHT AND THEN A
STRONGER SYSTEM WILL GET READY TO MOVE IN ON SATURDAY. THE BRUNT OF
THIS NEXT SYSTEM WILL HAVE THE GREATEST IMPACTS IN THE EXTENDED
PERIOD...I.E. SATURDAY NIGHT ONWARD. WILL EXPECT INCREASING RAIN AND
ALSO INCREASING WINDS WITH THIS NEXT SYSTEM BY SATURDAY NIGHT. IN
THE MEAN TIME EXPECT CLOUDY SKIES AND WARMING TEMPERATURES THROUGH
THE SHORT TERM PERIOD WITH SNOW LEVELS INCREASING A LITTLE EACH DAY.
88

.LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY NIGHT...AN ACTIVE
WEATHER PATTERN IS EXPECTED DURING THE FORECAST PERIOD WITH SEVERAL
STORM SYSTEMS SET TO IMPACT THE AREA.  A 150 KT ZONAL JET IS
EXPECTED TO LINE UP WITH THE PACIFIC NORTHWEST SUNDAY AND MONDAY.
THE RIGHT JET EXIT REGION...SYNONYMOUS WITH SINKING AIR...IS
PRESENTLY PROGGED TO BE OVER THE CWA SUNDAY AND MONDAY WITH THE
POTENTIAL FOR A LEE SIDE TROUGH TO SETUP DOWNWIND OF THE CASCADES.
THEREFORE...CONCERN EXISTS FOR A HIGH WIND EVENT BUT TIMING FROM
RECENT MODEL RUNS HAS DELAYED THE POTENTIAL START OF THE EVENT TO
SUNDAY NIGHT INTO MONDAY.  WILL CONTINUE TO MONITOR OR THE POTENTIAL
FOR HIGH WINDS ACROSS THE CWA AND HAVE CHANGED THE FORECAST TO
INDICATE STRONGEST WIND POTENTIAL INTO MIDDAY SUNDAY INTO EARLY
MONDAY TIMEFRAME.  THE OTHER ITEM OF NOTE DURING THE UPCOMING
WEEKEND IS THE POTENTIAL FOR A STEADY STREAM OF MOISTURE INTO THE
AREA WITH RAINFALL SATURDAY NIGHT THRU MONDAY THAT CAN BE HEAVY AT
TIMES.  QPF TOTALS COULD BE IN EXCESS OF 2 INCHES IN THE MOUNTAINS
WITH BETWEEN A QUARTER TO HALF AN INCH IN LOW LYING AREAS.  GIVEN
THE STRONG WINDS AND A WARM FRONT EXPECTED TO MOVE IN
SUNDAY...TEMPERATURES WILL RISE INTO THE MID 40S TO LOWER 50S IN THE
COLUMBIA BASIN AND UPPER 30S TO MID 40S ALONG THE HIGHER
ELEVATIONS.  THIS WILL TRANSLATE TO A MOSTLY RAIN PRECIPITATION
EVENT...THOUGH SNOW MAY STILL FALL ALONG THE HIGHEST MOUNTAIN PEAKS.

A LONGWAVE RIDGE WILL SETUP OFF THE PACIFIC COAST MONDAY NIGHT
BRINGING A NORTHWEST FLOW TO THE AREA.  SHORTWAVE TROUGHS WILL STILL
RIDE OVER THE RIDGE INTO THE REGION BRINGING A CHANCE OF
PRECIPITATION FAVORING THE HIGHER ELEVATIONS THROUGH EARLY
WEDNESDAY.  A TROUGH ORIGINATING FROM THE GULF OF ALASKA AND BRITISH
COLUMBIA IS PROGGED TO MOVE SOUTHEAST INTO OUR REGION WEDNESDAY WITH
A SHOT OF ARCTIC AIR EXPECTED.  THIS WILL DROP TEMPERATURES 10
DEGREES ON WEDNESDAY...CHRISTMAS EVE...WITH THE POSSIBILITY OF SNOW
LEVELS DROPPING DOWN TO THE COLUMBIA BASIN FLOOR.  BIEDA

&&

.AVIATION...PREVIOUS DISCUSSION...06Z TAFS...IFR/LIFR CONDITIONS
WILL PREVAIL AT KPDT AND KALW. MVFR CONDITIONS WILL PREVAIL AT OTHER
TAF SITES WITH OCCASIONAL IFR CIGS UNTIL 18Z. THESE CONDITIONS WILL
CONTINUE INTO THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT
POSSIBLE AFTER 18Z THURSDAY. WINDS WILL BE LIGHT. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  41  33  43  35 /  10  60  70  20
ALW  42  35  44  37 /  10  60  80  20
PSC  44  34  46  36 /  10  60  70  10
YKM  42  33  44  32 /  10  70  60  10
HRI  43  33  45  36 /  10  60  70  20
ELN  41  33  43  32 /  10  70  60  10
RDM  45  32  47  31 /  10  60  60  20
LGD  47  35  49  31 /  20  40  80  20
GCD  44  32  46  35 /  20  40  80  20
DLS  46  37  48  39 /  10  70  70  30

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

88/98/76










000
FXUS66 KPDT 180513 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
912 PM PST WED DEC 17 2014

UPDATED AVIATION DISCUSSION

.UPDATE...A FEW DISORGANIZED SHOWERS ARE MOVING ACROSS THE CWA
THIS EVENING. DENSE FOG IS OVER PARTS OF THE BLUE MOUNTAIN
FOOTHILLS. PATCHY FOG HAS DEVELOPED OVER THE KITTITAS VALLEY. WEB
CAMS AND OBSERVATIONS DO NOT SHOW VERY MUCH FOG IN CENTRAL AND
NORTH CENTRAL OREGON YET. FORECAST IS ON TRACK BUT WILL NEED TO
MONITOR DEVELOPMENT OF FOG WITH MOIST AND STAGNANT AIR MASS OVER
THE AREA.  COONFIELD

&&

.AVIATION...06Z TAFS...IFR/LIFR CONDITIONS WILL PREVAIL AT KPDT AND
KALW. MVFR CONDITIONS WILL PREVAIL AT OTHER TAF SITES WITH
OCCASIONAL IFR CIGS UNTIL 18Z. THESE CONDITIONS WILL CONTINUE INTO
THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT POSSIBLE AFTER
18Z THURSDAY. WINDS WILL BE LIGHT. 76

&&

.PREV DISC... /ISSUED 242 PM PST WED DEC 17 2014/

SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...ONE LAST WEAK
DISTURBANCE WILL MOVE ACROSS THE REGION TONIGHT. THIS SYSTEM WILL
CAUSE ISOLATED TO SCATTERED RAIN OR SNOW SHOWERS. THE STAGNANT AIR
MASS ACROSS THE BASIN WILL CONTINUE INTO THURSDAY, AND AS SUCH
PATCHY TO AREAS OF FOG WILL DEVELOP OR EXPAND IN COVERAGE. THE
DENSEST FOG WILL GENERALLY OCCUR BETWEEN THE ELEVATIONS OF 1500 AND
3000 FEET MSL. AT THIS TIME HAVE ENOUGH CONFIDENCE TO ISSUE DENSE
FOG ADVISORIES FOR THE BLUE MOUNTAIN FOOTHILLS AND THE KITTITAS
VALLEY. PORTIONS OF NORTH-CENTRAL AND CENTRAL OREGON MAY NEED TO BE
ADDED DEPENDING ON DEVELOPMENT IN THESE AREAS. GENERALLY EXPECT
TEMPS TO REMAIN ABOVE FREEZING IN THE FOGGY AREAS, THOUGH SOME
LOCATIONS WILL SEE LOWS BETWEEN 30 AND 32 DEGREES. THUS SOME LOCAL
FREEZING FOG WILL BE POSSIBLE. OTHER THAN A FEW LINGERING SHOWERS,
CONDITIONS WILL BE GENERALLY DRY THURSDAY DUE TO A TRANSITORY UPPER
LEVEL HIGH PRESSURE RIDGE. MOST FOGGY AREAS SHOULD SEE IMPROVEMENT
BY LATE MORNING THURSDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL
BEGIN TO MOVE INTO THE REGION THURSDAY NIGHT. PRECIP WILL GRADUALLY
SPREAD FROM WEST TO EAST THROUGH THE NIGHT. SNOW LEVELS WILL RANGE
FROM NEAR 2000 FEET IN WESTERN KITTITAS COUNTY TO BETWEEN 3500 AND
4500 FEET ELSEWHERE. SNOW AMOUNTS AT THIS TIME ARE EXPECTED TO BE 3
INCHES OR LESS OVER THE HIGHER ELEVATIONS. THIS SYSTEM WILL ALSO
BEGIN TO INCREASE SOUTHERLY WINDS OVER A GOOD PORTION OF OUR OREGON
ZONES. SHOULD SEE AT LEAST WINDY CONDITIONS OVER THE SOUTHERN GRANDE
RONDE VALLEY. THE INCREASING CLOUD COVER, PRECIP AND WINDS SHOULD
LIMIT FOG DEVELOPMENT IN THE BASIN. 90

LONG TERM...FRIDAY THROUGH WEDNESDAY...ACTIVE WEATHER PATTERN IS
STORE THROUGH THE PERIOD WITH SEVERAL STORM SYSTEMS TO IMPACT THE
REGION. THE FLOW PATTERN WILL BE FAST ZONAL FOR MUCH OF THE TIME BUT
INDICATIONS ARE THAT IT WILL TRANSITION TO MORE NWLY TUESDAY INTO
WEDNESDAY AS ARCTIC AIR BEGINS TO FILTER INTO THE REGION. FOR FRIDAY
INTO SUNDAY EXPECT PERIODS OF MOSTLY RAIN HEAVY AT TIMES...
ESPECIALLY MOUNTAINS. THERE COULD BE IN EXCESS OF 2 INCHES OF QPF IN
THE MOUNTAINS WITH RISES LIKELY ON RIVERS AND STREAMS. IT IS
POSSIBLE THAT THERE COULD BE SOME SNOW ALONG THE I-90 CORRIDOR IN NW
KITTITAS COUNTY IF SNOW LEVELS ARE JUST A BIT LOWER THAN CURRENTLY
FORECAST. THERE IS ALSO THE POTENTIAL FOR A HIGH WIND EVENT SATURDAY
NIGHT INTO SUNDAY LOWER ELEVATIONS WITH A STRONG WESTERLY LOW LEVEL
JET AND TIGHT SURFACE PRESSURE GRADIENT. FOR NOW HAVE BEEFED UP THE
WINDS TO ADVISORY LEVELS FOR THAT TIME PERIOD. THERE WILL CONTINUE
TO BE A CHANCE OF RAIN ON MONDAY AND TUESDAY BUT THE RAIN WILL
TRANSITION TO SNOW BY WEDNESDAY (CHRISTMAS EVE) AS SNOW LEVELS LOWER
WITH THE ARRIVAL OF THE ARCTIC AIR. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  38  33  42 /  30  10  50  70
ALW  32  39  35  42 /  30  10  50  80
PSC  34  41  34  43 /  20  10  60  70
YKM  33  39  33  40 /  30  10  70  40
HRI  34  41  33  43 /  30  10  60  70
ELN  33  38  33  36 /  30  10  70  50
RDM  29  43  32  43 /  30  10  60  60
LGD  32  45  35  40 /  40  20  40  80
GCD  31  42  32  39 /  30  20  40  80
DLS  38  44  37  44 /  40  10  70  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

76/76/76









000
FXUS66 KPDT 180513 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE PENDLETON OR
912 PM PST WED DEC 17 2014

UPDATED AVIATION DISCUSSION

.UPDATE...A FEW DISORGANIZED SHOWERS ARE MOVING ACROSS THE CWA
THIS EVENING. DENSE FOG IS OVER PARTS OF THE BLUE MOUNTAIN
FOOTHILLS. PATCHY FOG HAS DEVELOPED OVER THE KITTITAS VALLEY. WEB
CAMS AND OBSERVATIONS DO NOT SHOW VERY MUCH FOG IN CENTRAL AND
NORTH CENTRAL OREGON YET. FORECAST IS ON TRACK BUT WILL NEED TO
MONITOR DEVELOPMENT OF FOG WITH MOIST AND STAGNANT AIR MASS OVER
THE AREA.  COONFIELD

&&

.AVIATION...06Z TAFS...IFR/LIFR CONDITIONS WILL PREVAIL AT KPDT AND
KALW. MVFR CONDITIONS WILL PREVAIL AT OTHER TAF SITES WITH
OCCASIONAL IFR CIGS UNTIL 18Z. THESE CONDITIONS WILL CONTINUE INTO
THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT POSSIBLE AFTER
18Z THURSDAY. WINDS WILL BE LIGHT. 76

&&

.PREV DISC... /ISSUED 242 PM PST WED DEC 17 2014/

SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...ONE LAST WEAK
DISTURBANCE WILL MOVE ACROSS THE REGION TONIGHT. THIS SYSTEM WILL
CAUSE ISOLATED TO SCATTERED RAIN OR SNOW SHOWERS. THE STAGNANT AIR
MASS ACROSS THE BASIN WILL CONTINUE INTO THURSDAY, AND AS SUCH
PATCHY TO AREAS OF FOG WILL DEVELOP OR EXPAND IN COVERAGE. THE
DENSEST FOG WILL GENERALLY OCCUR BETWEEN THE ELEVATIONS OF 1500 AND
3000 FEET MSL. AT THIS TIME HAVE ENOUGH CONFIDENCE TO ISSUE DENSE
FOG ADVISORIES FOR THE BLUE MOUNTAIN FOOTHILLS AND THE KITTITAS
VALLEY. PORTIONS OF NORTH-CENTRAL AND CENTRAL OREGON MAY NEED TO BE
ADDED DEPENDING ON DEVELOPMENT IN THESE AREAS. GENERALLY EXPECT
TEMPS TO REMAIN ABOVE FREEZING IN THE FOGGY AREAS, THOUGH SOME
LOCATIONS WILL SEE LOWS BETWEEN 30 AND 32 DEGREES. THUS SOME LOCAL
FREEZING FOG WILL BE POSSIBLE. OTHER THAN A FEW LINGERING SHOWERS,
CONDITIONS WILL BE GENERALLY DRY THURSDAY DUE TO A TRANSITORY UPPER
LEVEL HIGH PRESSURE RIDGE. MOST FOGGY AREAS SHOULD SEE IMPROVEMENT
BY LATE MORNING THURSDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL
BEGIN TO MOVE INTO THE REGION THURSDAY NIGHT. PRECIP WILL GRADUALLY
SPREAD FROM WEST TO EAST THROUGH THE NIGHT. SNOW LEVELS WILL RANGE
FROM NEAR 2000 FEET IN WESTERN KITTITAS COUNTY TO BETWEEN 3500 AND
4500 FEET ELSEWHERE. SNOW AMOUNTS AT THIS TIME ARE EXPECTED TO BE 3
INCHES OR LESS OVER THE HIGHER ELEVATIONS. THIS SYSTEM WILL ALSO
BEGIN TO INCREASE SOUTHERLY WINDS OVER A GOOD PORTION OF OUR OREGON
ZONES. SHOULD SEE AT LEAST WINDY CONDITIONS OVER THE SOUTHERN GRANDE
RONDE VALLEY. THE INCREASING CLOUD COVER, PRECIP AND WINDS SHOULD
LIMIT FOG DEVELOPMENT IN THE BASIN. 90

LONG TERM...FRIDAY THROUGH WEDNESDAY...ACTIVE WEATHER PATTERN IS
STORE THROUGH THE PERIOD WITH SEVERAL STORM SYSTEMS TO IMPACT THE
REGION. THE FLOW PATTERN WILL BE FAST ZONAL FOR MUCH OF THE TIME BUT
INDICATIONS ARE THAT IT WILL TRANSITION TO MORE NWLY TUESDAY INTO
WEDNESDAY AS ARCTIC AIR BEGINS TO FILTER INTO THE REGION. FOR FRIDAY
INTO SUNDAY EXPECT PERIODS OF MOSTLY RAIN HEAVY AT TIMES...
ESPECIALLY MOUNTAINS. THERE COULD BE IN EXCESS OF 2 INCHES OF QPF IN
THE MOUNTAINS WITH RISES LIKELY ON RIVERS AND STREAMS. IT IS
POSSIBLE THAT THERE COULD BE SOME SNOW ALONG THE I-90 CORRIDOR IN NW
KITTITAS COUNTY IF SNOW LEVELS ARE JUST A BIT LOWER THAN CURRENTLY
FORECAST. THERE IS ALSO THE POTENTIAL FOR A HIGH WIND EVENT SATURDAY
NIGHT INTO SUNDAY LOWER ELEVATIONS WITH A STRONG WESTERLY LOW LEVEL
JET AND TIGHT SURFACE PRESSURE GRADIENT. FOR NOW HAVE BEEFED UP THE
WINDS TO ADVISORY LEVELS FOR THAT TIME PERIOD. THERE WILL CONTINUE
TO BE A CHANCE OF RAIN ON MONDAY AND TUESDAY BUT THE RAIN WILL
TRANSITION TO SNOW BY WEDNESDAY (CHRISTMAS EVE) AS SNOW LEVELS LOWER
WITH THE ARRIVAL OF THE ARCTIC AIR. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  38  33  42 /  30  10  50  70
ALW  32  39  35  42 /  30  10  50  80
PSC  34  41  34  43 /  20  10  60  70
YKM  33  39  33  40 /  30  10  70  40
HRI  34  41  33  43 /  30  10  60  70
ELN  33  38  33  36 /  30  10  70  50
RDM  29  43  32  43 /  30  10  60  60
LGD  32  45  35  40 /  40  20  40  80
GCD  31  42  32  39 /  30  20  40  80
DLS  38  44  37  44 /  40  10  70  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

76/76/76










000
FXUS66 KPDT 180407
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
807 PM PST WED DEC 17 2014

.UPDATE...A FEW DISORGANIZED SHOWERS ARE MOVING ACROSS THE CWA
THIS EVENING. DENSE FOG IS OVER PARTS OF THE BLUE MOUNTAIN
FOOTHILLS. PATCHY FOG HAS DEVELOPED OVER THE KITTITAS VALLEY. WEB
CAMS AND OBSERVATIONS DO NOT SHOW VERY MUCH FOG IN CENTRAL AND
NORTH CENTRAL OREGON YET. FORECAST IS ON TRACK BUT WILL NEED TO
MONITOR DEVELOPMENT OF FOG WITH MOIST AND STAGNANT AIR MASS OVER
THE AREA.  COONFIELD

&&

.PREV DISC... /ISSUED 242 PM PST WED DEC 17 2014/

SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...ONE LAST WEAK
DISTURBANCE WILL MOVE ACROSS THE REGION TONIGHT. THIS SYSTEM WILL
CAUSE ISOLATED TO SCATTERED RAIN OR SNOW SHOWERS. THE STAGNANT AIR
MASS ACROSS THE BASIN WILL CONTINUE INTO THURSDAY, AND AS SUCH
PATCHY TO AREAS OF FOG WILL DEVELOP OR EXPAND IN COVERAGE. THE
DENSEST FOG WILL GENERALLY OCCUR BETWEEN THE ELEVATIONS OF 1500 AND
3000 FEET MSL. AT THIS TIME HAVE ENOUGH CONFIDENCE TO ISSUE DENSE
FOG ADVISORIES FOR THE BLUE MOUNTAIN FOOTHILLS AND THE KITTITAS
VALLEY. PORTIONS OF NORTH-CENTRAL AND CENTRAL OREGON MAY NEED TO BE
ADDED DEPENDING ON DEVELOPMENT IN THESE AREAS. GENERALLY EXPECT
TEMPS TO REMAIN ABOVE FREEZING IN THE FOGGY AREAS, THOUGH SOME
LOCATIONS WILL SEE LOWS BETWEEN 30 AND 32 DEGREES. THUS SOME LOCAL
FREEZING FOG WILL BE POSSIBLE. OTHER THAN A FEW LINGERING SHOWERS,
CONDITIONS WILL BE GENERALLY DRY THURSDAY DUE TO A TRANSITORY UPPER
LEVEL HIGH PRESSURE RIDGE. MOST FOGGY AREAS SHOULD SEE IMPROVEMENT
BY LATE MORNING THURSDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL
BEGIN TO MOVE INTO THE REGION THURSDAY NIGHT. PRECIP WILL GRADUALLY
SPREAD FROM WEST TO EAST THROUGH THE NIGHT. SNOW LEVELS WILL RANGE
FROM NEAR 2000 FEET IN WESTERN KITTITAS COUNTY TO BETWEEN 3500 AND
4500 FEET ELSEWHERE. SNOW AMOUNTS AT THIS TIME ARE EXPECTED TO BE 3
INCHES OR LESS OVER THE HIGHER ELEVATIONS. THIS SYSTEM WILL ALSO
BEGIN TO INCREASE SOUTHERLY WINDS OVER A GOOD PORTION OF OUR OREGON
ZONES. SHOULD SEE AT LEAST WINDY CONDITIONS OVER THE SOUTHERN GRANDE
RONDE VALLEY. THE INCREASING CLOUD COVER, PRECIP AND WINDS SHOULD
LIMIT FOG DEVELOPMENT IN THE BASIN. 90

LONG TERM...FRIDAY THROUGH WEDNESDAY...ACTIVE WEATHER PATTERN IS
STORE THROUGH THE PERIOD WITH SEVERAL STORM SYSTEMS TO IMPACT THE
REGION. THE FLOW PATTERN WILL BE FAST ZONAL FOR MUCH OF THE TIME BUT
INDICATIONS ARE THAT IT WILL TRANSITION TO MORE NWLY TUESDAY INTO
WEDNESDAY AS ARCTIC AIR BEGINS TO FILTER INTO THE REGION. FOR FRIDAY
INTO SUNDAY EXPECT PERIODS OF MOSTLY RAIN HEAVY AT TIMES...
ESPECIALLY MOUNTAINS. THERE COULD BE IN EXCESS OF 2 INCHES OF QPF IN
THE MOUNTAINS WITH RISES LIKELY ON RIVERS AND STREAMS. IT IS
POSSIBLE THAT THERE COULD BE SOME SNOW ALONG THE I-90 CORRIDOR IN NW
KITTITAS COUNTY IF SNOW LEVELS ARE JUST A BIT LOWER THAN CURRENTLY
FORECAST. THERE IS ALSO THE POTENTIAL FOR A HIGH WIND EVENT SATURDAY
NIGHT INTO SUNDAY LOWER ELEVATIONS WITH A STRONG WESTERLY LOW LEVEL
JET AND TIGHT SURFACE PRESSURE GRADIENT. FOR NOW HAVE BEEFED UP THE
WINDS TO ADVISORY LEVELS FOR THAT TIME PERIOD. THERE WILL CONTINUE
TO BE A CHANCE OF RAIN ON MONDAY AND TUESDAY BUT THE RAIN WILL
TRANSITION TO SNOW BY WEDNESDAY (CHRISTMAS EVE) AS SNOW LEVELS LOWER
WITH THE ARRIVAL OF THE ARCTIC AIR. 78

AVIATION...00Z TAFS...IFR/LIFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD. SOME IMPROVEMENT IN CONDITIONS HAS OCCURRED THIS
AFTERNOON AT THE TAF SITES BUT EXPECT CIGS/VSBYS TO LOWER THIS
EVENING AND ESPECIALLY OVERNIGHT TO IFR/LIFR. THESE CONDITIONS WILL
CONTINUE INTO THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT
POSSIBLE AFTER 18Z THURSDAY. WINDS WILL BE LIGHT. THERE COULD BE A
LITTLE RAIN AROUND BUT SHOULD NOT AMOUNT TO MORE THAN A FEW
HUNDREDTHS OF AN INCH. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  38  33  42 /  30  10  50  70
ALW  32  39  35  42 /  30  10  50  80
PSC  34  41  34  43 /  20  10  60  70
YKM  33  39  33  40 /  30  10  70  40
HRI  34  41  33  43 /  30  10  60  70
ELN  33  38  33  36 /  30  10  70  50
RDM  29  43  32  43 /  30  10  60  60
LGD  32  45  35  40 /  40  20  40  80
GCD  31  42  32  39 /  30  20  40  80
DLS  38  44  37  44 /  40  10  70  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

76/76/76






000
FXUS66 KPDT 180407
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
807 PM PST WED DEC 17 2014

.UPDATE...A FEW DISORGANIZED SHOWERS ARE MOVING ACROSS THE CWA
THIS EVENING. DENSE FOG IS OVER PARTS OF THE BLUE MOUNTAIN
FOOTHILLS. PATCHY FOG HAS DEVELOPED OVER THE KITTITAS VALLEY. WEB
CAMS AND OBSERVATIONS DO NOT SHOW VERY MUCH FOG IN CENTRAL AND
NORTH CENTRAL OREGON YET. FORECAST IS ON TRACK BUT WILL NEED TO
MONITOR DEVELOPMENT OF FOG WITH MOIST AND STAGNANT AIR MASS OVER
THE AREA.  COONFIELD

&&

.PREV DISC... /ISSUED 242 PM PST WED DEC 17 2014/

SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...ONE LAST WEAK
DISTURBANCE WILL MOVE ACROSS THE REGION TONIGHT. THIS SYSTEM WILL
CAUSE ISOLATED TO SCATTERED RAIN OR SNOW SHOWERS. THE STAGNANT AIR
MASS ACROSS THE BASIN WILL CONTINUE INTO THURSDAY, AND AS SUCH
PATCHY TO AREAS OF FOG WILL DEVELOP OR EXPAND IN COVERAGE. THE
DENSEST FOG WILL GENERALLY OCCUR BETWEEN THE ELEVATIONS OF 1500 AND
3000 FEET MSL. AT THIS TIME HAVE ENOUGH CONFIDENCE TO ISSUE DENSE
FOG ADVISORIES FOR THE BLUE MOUNTAIN FOOTHILLS AND THE KITTITAS
VALLEY. PORTIONS OF NORTH-CENTRAL AND CENTRAL OREGON MAY NEED TO BE
ADDED DEPENDING ON DEVELOPMENT IN THESE AREAS. GENERALLY EXPECT
TEMPS TO REMAIN ABOVE FREEZING IN THE FOGGY AREAS, THOUGH SOME
LOCATIONS WILL SEE LOWS BETWEEN 30 AND 32 DEGREES. THUS SOME LOCAL
FREEZING FOG WILL BE POSSIBLE. OTHER THAN A FEW LINGERING SHOWERS,
CONDITIONS WILL BE GENERALLY DRY THURSDAY DUE TO A TRANSITORY UPPER
LEVEL HIGH PRESSURE RIDGE. MOST FOGGY AREAS SHOULD SEE IMPROVEMENT
BY LATE MORNING THURSDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL
BEGIN TO MOVE INTO THE REGION THURSDAY NIGHT. PRECIP WILL GRADUALLY
SPREAD FROM WEST TO EAST THROUGH THE NIGHT. SNOW LEVELS WILL RANGE
FROM NEAR 2000 FEET IN WESTERN KITTITAS COUNTY TO BETWEEN 3500 AND
4500 FEET ELSEWHERE. SNOW AMOUNTS AT THIS TIME ARE EXPECTED TO BE 3
INCHES OR LESS OVER THE HIGHER ELEVATIONS. THIS SYSTEM WILL ALSO
BEGIN TO INCREASE SOUTHERLY WINDS OVER A GOOD PORTION OF OUR OREGON
ZONES. SHOULD SEE AT LEAST WINDY CONDITIONS OVER THE SOUTHERN GRANDE
RONDE VALLEY. THE INCREASING CLOUD COVER, PRECIP AND WINDS SHOULD
LIMIT FOG DEVELOPMENT IN THE BASIN. 90

LONG TERM...FRIDAY THROUGH WEDNESDAY...ACTIVE WEATHER PATTERN IS
STORE THROUGH THE PERIOD WITH SEVERAL STORM SYSTEMS TO IMPACT THE
REGION. THE FLOW PATTERN WILL BE FAST ZONAL FOR MUCH OF THE TIME BUT
INDICATIONS ARE THAT IT WILL TRANSITION TO MORE NWLY TUESDAY INTO
WEDNESDAY AS ARCTIC AIR BEGINS TO FILTER INTO THE REGION. FOR FRIDAY
INTO SUNDAY EXPECT PERIODS OF MOSTLY RAIN HEAVY AT TIMES...
ESPECIALLY MOUNTAINS. THERE COULD BE IN EXCESS OF 2 INCHES OF QPF IN
THE MOUNTAINS WITH RISES LIKELY ON RIVERS AND STREAMS. IT IS
POSSIBLE THAT THERE COULD BE SOME SNOW ALONG THE I-90 CORRIDOR IN NW
KITTITAS COUNTY IF SNOW LEVELS ARE JUST A BIT LOWER THAN CURRENTLY
FORECAST. THERE IS ALSO THE POTENTIAL FOR A HIGH WIND EVENT SATURDAY
NIGHT INTO SUNDAY LOWER ELEVATIONS WITH A STRONG WESTERLY LOW LEVEL
JET AND TIGHT SURFACE PRESSURE GRADIENT. FOR NOW HAVE BEEFED UP THE
WINDS TO ADVISORY LEVELS FOR THAT TIME PERIOD. THERE WILL CONTINUE
TO BE A CHANCE OF RAIN ON MONDAY AND TUESDAY BUT THE RAIN WILL
TRANSITION TO SNOW BY WEDNESDAY (CHRISTMAS EVE) AS SNOW LEVELS LOWER
WITH THE ARRIVAL OF THE ARCTIC AIR. 78

AVIATION...00Z TAFS...IFR/LIFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD. SOME IMPROVEMENT IN CONDITIONS HAS OCCURRED THIS
AFTERNOON AT THE TAF SITES BUT EXPECT CIGS/VSBYS TO LOWER THIS
EVENING AND ESPECIALLY OVERNIGHT TO IFR/LIFR. THESE CONDITIONS WILL
CONTINUE INTO THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT
POSSIBLE AFTER 18Z THURSDAY. WINDS WILL BE LIGHT. THERE COULD BE A
LITTLE RAIN AROUND BUT SHOULD NOT AMOUNT TO MORE THAN A FEW
HUNDREDTHS OF AN INCH. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  38  33  42 /  30  10  50  70
ALW  32  39  35  42 /  30  10  50  80
PSC  34  41  34  43 /  20  10  60  70
YKM  33  39  33  40 /  30  10  70  40
HRI  34  41  33  43 /  30  10  60  70
ELN  33  38  33  36 /  30  10  70  50
RDM  29  43  32  43 /  30  10  60  60
LGD  32  45  35  40 /  40  20  40  80
GCD  31  42  32  39 /  30  20  40  80
DLS  38  44  37  44 /  40  10  70  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY ORZ507-508.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THURSDAY WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

76/76/76







000
FXUS66 KPDT 172242
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
242 PM PST WED DEC 17 2014

.SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...ONE LAST WEAK
DISTURBANCE WILL MOVE ACROSS THE REGION TONIGHT. THIS SYSTEM WILL
CAUSE ISOLATED TO SCATTERED RAIN OR SNOW SHOWERS. THE STAGNANT AIR
MASS ACROSS THE BASIN WILL CONTINUE INTO THURSDAY, AND AS SUCH
PATCHY TO AREAS OF FOG WILL DEVELOP OR EXPAND IN COVERAGE. THE
DENSEST FOG WILL GENERALLY OCCUR BETWEEN THE ELEVATIONS OF 1500 AND
3000 FEET MSL. AT THIS TIME HAVE ENOUGH CONFIDENCE TO ISSUE DENSE
FOG ADVISORIES FOR THE BLUE MOUNTAIN FOOTHILLS AND THE KITTITAS
VALLEY. PORTIONS OF NORTH-CENTRAL AND CENTRAL OREGON MAY NEED TO BE
ADDED DEPENDING ON DEVELOPMENT IN THESE AREAS. GENERALLY EXPECT
TEMPS TO REMAIN ABOVE FREEZING IN THE FOGGY AREAS, THOUGH SOME
LOCATIONS WILL SEE LOWS BETWEEN 30 AND 32 DEGREES. THUS SOME LOCAL
FREEZING FOG WILL BE POSSIBLE. OTHER THAN A FEW LINGERING SHOWERS,
CONDITIONS WILL BE GENERALLY DRY THURSDAY DUE TO A TRANSITORY UPPER
LEVEL HIGH PRESSURE RIDGE. MOST FOGGY AREAS SHOULD SEE IMPROVEMENT
BY LATE MORNING THURSDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL
BEGIN TO MOVE INTO THE REGION THURSDAY NIGHT. PRECIP WILL GRADUALLY
SPREAD FROM WEST TO EAST THROUGH THE NIGHT. SNOW LEVELS WILL RANGE
FROM NEAR 2000 FEET IN WESTERN KITTITAS COUNTY TO BETWEEN 3500 AND
4500 FEET ELSEWHERE. SNOW AMOUNTS AT THIS TIME ARE EXPECTED TO BE 3
INCHES OR LESS OVER THE HIGHER ELEVATIONS. THIS SYSTEM WILL ALSO
BEGIN TO INCREASE SOUTHERLY WINDS OVER A GOOD PORTION OF OUR OREGON
ZONES. SHOULD SEE AT LEAST WINDY CONDITIONS OVER THE SOUTHERN GRANDE
RONDE VALLEY. THE INCREASING CLOUD COVER, PRECIP AND WINDS SHOULD
LIMIT FOG DEVELOPMENT IN THE BASIN. 90

.LONG TERM...FRIDAY THROUGH WEDNESDAY...ACTIVE WEATHER PATTERN IS
STORE THROUGH THE PERIOD WITH SEVERAL STORM SYSTEMS TO IMPACT THE
REGION. THE FLOW PATTERN WILL BE FAST ZONAL FOR MUCH OF THE TIME BUT
INDICATIONS ARE THAT IT WILL TRANSITION TO MORE NWLY TUESDAY INTO
WEDNESDAY AS ARCTIC AIR BEGINS TO FILTER INTO THE REGION. FOR FRIDAY
INTO SUNDAY EXPECT PERIODS OF MOSTLY RAIN HEAVY AT TIMES...
ESPECIALLY MOUNTAINS. THERE COULD BE IN EXCESS OF 2 INCHES OF QPF IN
THE MOUNTAINS WITH RISES LIKELY ON RIVERS AND STREAMS. IT IS
POSSIBLE THAT THERE COULD BE SOME SNOW ALONG THE I-90 CORRIDOR IN NW
KITTITAS COUNTY IF SNOW LEVELS ARE JUST A BIT LOWER THAN CURRENTLY
FORECAST. THERE IS ALSO THE POTENTIAL FOR A HIGH WIND EVENT SATURDAY
NIGHT INTO SUNDAY LOWER ELEVATIONS WITH A STRONG WESTERLY LOW LEVEL
JET AND TIGHT SURFACE PRESSURE GRADIENT. FOR NOW HAVE BEEFED UP THE
WINDS TO ADVISORY LEVELS FOR THAT TIME PERIOD. THERE WILL CONTINUE
TO BE A CHANCE OF RAIN ON MONDAY AND TUESDAY BUT THE RAIN WILL
TRANSITION TO SNOW BY WEDNESDAY (CHRISTMAS EVE) AS SNOW LEVELS LOWER
WITH THE ARRIVAL OF THE ARCTIC AIR. 78

&&

.AVIATION...00Z TAFS...IFR/LIFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD. SOME IMPROVEMENT IN CONDITIONS HAS OCCURRED THIS
AFTERNOON AT THE TAF SITES BUT EXPECT CIGS/VSBYS TO LOWER THIS
EVENING AND ESPECIALLY OVERNIGHT TO IFR/LIFR. THESE CONDITIONS WILL
CONTINUE INTO THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT
POSSIBLE AFTER 18Z THURSDAY. WINDS WILL BE LIGHT. THERE COULD BE A
LITTLE RAIN AROUND BUT SHOULD NOT AMOUNT TO MORE THAN A FEW
HUNDREDTHS OF AN INCH. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  38  33  42 /  30  10  50  70
ALW  32  39  35  42 /  30  10  50  80
PSC  34  41  34  43 /  20  10  60  70
YKM  33  39  33  40 /  30  10  70  40
HRI  34  41  33  43 /  30  10  60  70
ELN  33  38  33  36 /  30  10  70  50
RDM  29  43  32  43 /  30  10  60  60
LGD  32  45  35  40 /  40  20  40  80
GCD  31  42  32  39 /  30  20  40  80
DLS  38  44  37  44 /  40  10  70  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY FROM 6 PM THIS EVENING TO 10 AM PST THURSDAY
     ORZ507-508.

WA...DENSE FOG ADVISORY FROM 6 PM THIS EVENING TO 10 AM PST THURSDAY
     WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/78/78










000
FXUS66 KPDT 172242
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
242 PM PST WED DEC 17 2014

.SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT...ONE LAST WEAK
DISTURBANCE WILL MOVE ACROSS THE REGION TONIGHT. THIS SYSTEM WILL
CAUSE ISOLATED TO SCATTERED RAIN OR SNOW SHOWERS. THE STAGNANT AIR
MASS ACROSS THE BASIN WILL CONTINUE INTO THURSDAY, AND AS SUCH
PATCHY TO AREAS OF FOG WILL DEVELOP OR EXPAND IN COVERAGE. THE
DENSEST FOG WILL GENERALLY OCCUR BETWEEN THE ELEVATIONS OF 1500 AND
3000 FEET MSL. AT THIS TIME HAVE ENOUGH CONFIDENCE TO ISSUE DENSE
FOG ADVISORIES FOR THE BLUE MOUNTAIN FOOTHILLS AND THE KITTITAS
VALLEY. PORTIONS OF NORTH-CENTRAL AND CENTRAL OREGON MAY NEED TO BE
ADDED DEPENDING ON DEVELOPMENT IN THESE AREAS. GENERALLY EXPECT
TEMPS TO REMAIN ABOVE FREEZING IN THE FOGGY AREAS, THOUGH SOME
LOCATIONS WILL SEE LOWS BETWEEN 30 AND 32 DEGREES. THUS SOME LOCAL
FREEZING FOG WILL BE POSSIBLE. OTHER THAN A FEW LINGERING SHOWERS,
CONDITIONS WILL BE GENERALLY DRY THURSDAY DUE TO A TRANSITORY UPPER
LEVEL HIGH PRESSURE RIDGE. MOST FOGGY AREAS SHOULD SEE IMPROVEMENT
BY LATE MORNING THURSDAY. A STRONGER AND WETTER PACIFIC SYSTEM WILL
BEGIN TO MOVE INTO THE REGION THURSDAY NIGHT. PRECIP WILL GRADUALLY
SPREAD FROM WEST TO EAST THROUGH THE NIGHT. SNOW LEVELS WILL RANGE
FROM NEAR 2000 FEET IN WESTERN KITTITAS COUNTY TO BETWEEN 3500 AND
4500 FEET ELSEWHERE. SNOW AMOUNTS AT THIS TIME ARE EXPECTED TO BE 3
INCHES OR LESS OVER THE HIGHER ELEVATIONS. THIS SYSTEM WILL ALSO
BEGIN TO INCREASE SOUTHERLY WINDS OVER A GOOD PORTION OF OUR OREGON
ZONES. SHOULD SEE AT LEAST WINDY CONDITIONS OVER THE SOUTHERN GRANDE
RONDE VALLEY. THE INCREASING CLOUD COVER, PRECIP AND WINDS SHOULD
LIMIT FOG DEVELOPMENT IN THE BASIN. 90

.LONG TERM...FRIDAY THROUGH WEDNESDAY...ACTIVE WEATHER PATTERN IS
STORE THROUGH THE PERIOD WITH SEVERAL STORM SYSTEMS TO IMPACT THE
REGION. THE FLOW PATTERN WILL BE FAST ZONAL FOR MUCH OF THE TIME BUT
INDICATIONS ARE THAT IT WILL TRANSITION TO MORE NWLY TUESDAY INTO
WEDNESDAY AS ARCTIC AIR BEGINS TO FILTER INTO THE REGION. FOR FRIDAY
INTO SUNDAY EXPECT PERIODS OF MOSTLY RAIN HEAVY AT TIMES...
ESPECIALLY MOUNTAINS. THERE COULD BE IN EXCESS OF 2 INCHES OF QPF IN
THE MOUNTAINS WITH RISES LIKELY ON RIVERS AND STREAMS. IT IS
POSSIBLE THAT THERE COULD BE SOME SNOW ALONG THE I-90 CORRIDOR IN NW
KITTITAS COUNTY IF SNOW LEVELS ARE JUST A BIT LOWER THAN CURRENTLY
FORECAST. THERE IS ALSO THE POTENTIAL FOR A HIGH WIND EVENT SATURDAY
NIGHT INTO SUNDAY LOWER ELEVATIONS WITH A STRONG WESTERLY LOW LEVEL
JET AND TIGHT SURFACE PRESSURE GRADIENT. FOR NOW HAVE BEEFED UP THE
WINDS TO ADVISORY LEVELS FOR THAT TIME PERIOD. THERE WILL CONTINUE
TO BE A CHANCE OF RAIN ON MONDAY AND TUESDAY BUT THE RAIN WILL
TRANSITION TO SNOW BY WEDNESDAY (CHRISTMAS EVE) AS SNOW LEVELS LOWER
WITH THE ARRIVAL OF THE ARCTIC AIR. 78

&&

.AVIATION...00Z TAFS...IFR/LIFR CONDITIONS WILL PREVAIL THROUGH THE
FORECAST PERIOD. SOME IMPROVEMENT IN CONDITIONS HAS OCCURRED THIS
AFTERNOON AT THE TAF SITES BUT EXPECT CIGS/VSBYS TO LOWER THIS
EVENING AND ESPECIALLY OVERNIGHT TO IFR/LIFR. THESE CONDITIONS WILL
CONTINUE INTO THE MORNING HOURS ON THURSDAY WITH SOME IMPROVEMENT
POSSIBLE AFTER 18Z THURSDAY. WINDS WILL BE LIGHT. THERE COULD BE A
LITTLE RAIN AROUND BUT SHOULD NOT AMOUNT TO MORE THAN A FEW
HUNDREDTHS OF AN INCH. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  30  38  33  42 /  30  10  50  70
ALW  32  39  35  42 /  30  10  50  80
PSC  34  41  34  43 /  20  10  60  70
YKM  33  39  33  40 /  30  10  70  40
HRI  34  41  33  43 /  30  10  60  70
ELN  33  38  33  36 /  30  10  70  50
RDM  29  43  32  43 /  30  10  60  60
LGD  32  45  35  40 /  40  20  40  80
GCD  31  42  32  39 /  30  20  40  80
DLS  38  44  37  44 /  40  10  70  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY FROM 6 PM THIS EVENING TO 10 AM PST THURSDAY
     ORZ507-508.

WA...DENSE FOG ADVISORY FROM 6 PM THIS EVENING TO 10 AM PST THURSDAY
     WAZ026-029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/78/78









000
FXUS66 KPDT 171735
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
935 AM PST WED DEC 17 2014

.SHORT TERM...MORNING UPDATE...UPPER TROUGH WILL CONTINUE OVER THE
REGION TODAY. A WEAKENING DISTURBANCE WILL EXIT THE AREA BY NOON,
WHILE A SECOND WEAKENING DISTURBANCE IS NOW REACHING THE COAST. THUS
SLIGHT CHANCE TO CHANCE POPS WILL MOSTLY COVER PRECIP OCCURRENCE
THROUGH TODAY. THE CASCADE CREST AREAS COULD SEE LIKELY POPS.
OVERALL FORECAST PACKAGE COVERED THESE POPS AND ONLY MADE SOME MINOR
ADJUSTMENTS. DENSE FOG AND FREEZING FOG CONTINUES WHERE THE STRATUS
DECK ACROSS THE BASIN INTERSECTS THE TERRAIN, GENERALLY BETWEEN 1200
AND 3000 FEET MSL. CURRENT ADVISORIES EXPIRE AT 10 AM AND SOME MAY
HAVE TO BE EXTENDED. ALSO MAY HAVE TO CONTINUE SOME OF THESE
ADVISORIES INTO TONIGHT. WINDS CONTINUE TO BE 10 MPH OR LESS EXCEPT
IN THE SOUTHERN GRANDE RONDE VALLEY WHERE THEY WILL RUN 20 TO 30 MPH
FROM THE SOUTH. 90

.LONG TERM...PREVIOUS DISCUSSION...LATEST MODEL GUIDANCE CONTINUES
TO SHOW AN ACTIVE WEATHER PATTERN DURING THE FORECAST PERIOD. A
SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY NIGHT THRU EARLY
SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO THE HIGHER
ELEVATIONS OF THE CWA. THE MAJOR HIGHLIGHT TO THE LONG TERM IS A
CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN IMPRESSIVE 150 KT
JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE WASHINGTON
STATE/OREGON AREA SATURDAY THRU MONDAY. PRECIPITATION CHANCES
INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT THROUGH
MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE AGREEMENT IS HIGH.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL. THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA. THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES. HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY. BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES. TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.

&&

.AVIATION...18Z TAFS...WIDESPREAD IFR/LIFR CONDITIONS IN STRATUS AND
FOG ARE EXPECTED THROUGH 18Z THURSDAY. THERE COULD BE A LITTLE RAIN
AT TIMES ESPECIALLY AT THE WESTERN TAF SITES. KPDT/KALW/KRDM ARE
LIKELY TO SEE THE WORST CONDITIONS WITH VISIBILITIES AS LOW AS 1/4
MILE AT TIMES AND CIGS AS LOW AS 1-2 HUNDRED FEET AGL. THERE COULD
BE SOME IMPROVEMENT IN CIGS AND VSBYS TEMPORARILY THIS AFTERNOON AND
EVENING AREAWIDE BEFORE CONDITIONS DETERIORATE AGAIN OVERNIGHT.
WINDS WILL BE LIGHT. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  37  33  42  36 /  20  30  10  30
ALW  38  34  42  37 /  20  30  10  30
PSC  42  32  40  35 /  20  30  10  40
YKM  39  30  38  33 /  40  30  10  60
HRI  41  33  41  35 /  20  30  10  40
ELN  38  29  37  32 /  50  30  10  60
RDM  39  27  42  32 /  40  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  41  32  40  32 /  30  30  20  30
DLS  43  35  41  38 /  40  40  10  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/98/78










000
FXUS66 KPDT 171735
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
935 AM PST WED DEC 17 2014

.SHORT TERM...MORNING UPDATE...UPPER TROUGH WILL CONTINUE OVER THE
REGION TODAY. A WEAKENING DISTURBANCE WILL EXIT THE AREA BY NOON,
WHILE A SECOND WEAKENING DISTURBANCE IS NOW REACHING THE COAST. THUS
SLIGHT CHANCE TO CHANCE POPS WILL MOSTLY COVER PRECIP OCCURRENCE
THROUGH TODAY. THE CASCADE CREST AREAS COULD SEE LIKELY POPS.
OVERALL FORECAST PACKAGE COVERED THESE POPS AND ONLY MADE SOME MINOR
ADJUSTMENTS. DENSE FOG AND FREEZING FOG CONTINUES WHERE THE STRATUS
DECK ACROSS THE BASIN INTERSECTS THE TERRAIN, GENERALLY BETWEEN 1200
AND 3000 FEET MSL. CURRENT ADVISORIES EXPIRE AT 10 AM AND SOME MAY
HAVE TO BE EXTENDED. ALSO MAY HAVE TO CONTINUE SOME OF THESE
ADVISORIES INTO TONIGHT. WINDS CONTINUE TO BE 10 MPH OR LESS EXCEPT
IN THE SOUTHERN GRANDE RONDE VALLEY WHERE THEY WILL RUN 20 TO 30 MPH
FROM THE SOUTH. 90

.LONG TERM...PREVIOUS DISCUSSION...LATEST MODEL GUIDANCE CONTINUES
TO SHOW AN ACTIVE WEATHER PATTERN DURING THE FORECAST PERIOD. A
SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY NIGHT THRU EARLY
SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO THE HIGHER
ELEVATIONS OF THE CWA. THE MAJOR HIGHLIGHT TO THE LONG TERM IS A
CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN IMPRESSIVE 150 KT
JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE WASHINGTON
STATE/OREGON AREA SATURDAY THRU MONDAY. PRECIPITATION CHANCES
INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT THROUGH
MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE AGREEMENT IS HIGH.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL. THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA. THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES. HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY. BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES. TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.

&&

.AVIATION...18Z TAFS...WIDESPREAD IFR/LIFR CONDITIONS IN STRATUS AND
FOG ARE EXPECTED THROUGH 18Z THURSDAY. THERE COULD BE A LITTLE RAIN
AT TIMES ESPECIALLY AT THE WESTERN TAF SITES. KPDT/KALW/KRDM ARE
LIKELY TO SEE THE WORST CONDITIONS WITH VISIBILITIES AS LOW AS 1/4
MILE AT TIMES AND CIGS AS LOW AS 1-2 HUNDRED FEET AGL. THERE COULD
BE SOME IMPROVEMENT IN CIGS AND VSBYS TEMPORARILY THIS AFTERNOON AND
EVENING AREAWIDE BEFORE CONDITIONS DETERIORATE AGAIN OVERNIGHT.
WINDS WILL BE LIGHT. 78

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  37  33  42  36 /  20  30  10  30
ALW  38  34  42  37 /  20  30  10  30
PSC  42  32  40  35 /  20  30  10  40
YKM  39  30  38  33 /  40  30  10  60
HRI  41  33  41  35 /  20  30  10  40
ELN  38  29  37  32 /  50  30  10  60
RDM  39  27  42  32 /  40  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  41  32  40  32 /  30  30  20  30
DLS  43  35  41  38 /  40  40  10  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/98/78









000
FXUS66 KPDT 171450 AAC
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
355 AM PST WED DEC 17 2014

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. LOCALLY DENSE FOG AND FREEZING FOG AS WELL.
EXPECT THIS TO CONTINUE INTO THE MORNING THEN DISSIPATE BY
AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE THROUGH
OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW CLOUDS
AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE WILL
BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS OVER
THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE AGREEMENT IS
HIGH.  MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT
2 TO 3 STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...12Z TAFS...LOW STRATUS AND FOG/FZFG/BR WILL CONTINUE
OVER THE NEXT 24 HOURS AT ALL TAF SITES. IFR/LIFR CONDITIONS WILL
CONTINUE AT ALL SITES...EXCEPT KYKM...THRU 17/18Z BEFORE THE STRATUS
DECK LIFTS WITH PRECIPITATION STARTING.  CIG/VIS WILL IMPROVE TO
MVFR/IFR BTWN 17/18Z THRU 18/03Z DUE TO POTENTIAL FOR RAIN AT
KDLS...KPDT...KALW...KPSC...AND KYKM WITH SNOW AT KRDM AND KBDN.
AFT 18/03Z...THE LOW STRATUS AND FOG BANK WILL REESTABLISH ITSELF
AND ONCE AGAIN RETURN CONDITIONS AT NEARLY ALL TAF SITES TO
LIFR/IFR.  WINDS WILL BE AOB 10 KTS DURING THE PERIOD.  AVIATION
DISCUSSIONS ARE NOT UPDATED FOR TAF AMENDMENTS.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98








000
FXUS66 KPDT 171450 AAC
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
355 AM PST WED DEC 17 2014

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. LOCALLY DENSE FOG AND FREEZING FOG AS WELL.
EXPECT THIS TO CONTINUE INTO THE MORNING THEN DISSIPATE BY
AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE THROUGH
OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW CLOUDS
AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE WILL
BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS OVER
THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE AGREEMENT IS
HIGH.  MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT
2 TO 3 STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...12Z TAFS...LOW STRATUS AND FOG/FZFG/BR WILL CONTINUE
OVER THE NEXT 24 HOURS AT ALL TAF SITES. IFR/LIFR CONDITIONS WILL
CONTINUE AT ALL SITES...EXCEPT KYKM...THRU 17/18Z BEFORE THE STRATUS
DECK LIFTS WITH PRECIPITATION STARTING.  CIG/VIS WILL IMPROVE TO
MVFR/IFR BTWN 17/18Z THRU 18/03Z DUE TO POTENTIAL FOR RAIN AT
KDLS...KPDT...KALW...KPSC...AND KYKM WITH SNOW AT KRDM AND KBDN.
AFT 18/03Z...THE LOW STRATUS AND FOG BANK WILL REESTABLISH ITSELF
AND ONCE AGAIN RETURN CONDITIONS AT NEARLY ALL TAF SITES TO
LIFR/IFR.  WINDS WILL BE AOB 10 KTS DURING THE PERIOD.  AVIATION
DISCUSSIONS ARE NOT UPDATED FOR TAF AMENDMENTS.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98







000
FXUS66 KPDT 171153 AAB
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
355 AM PST WED DEC 17 2014

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. LOCALLY DENSE FOG AND FREEZING FOG AS WELL.
EXPECT THIS TO CONTINUE INTO THE MORNING THEN DISSIPATE BY
AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE THROUGH
OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW CLOUDS
AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE WILL
BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS OVER
THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE CONFIDENCE.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...12Z TAFS...LOW STRATUS AND FOG/FZFG/BR WILL CONTINUE
OVER THE NEXT 24 HOURS AT ALL TAF SITES. IFR/LIFR CONDITIONS WILL
CONTINUE AT ALL SITES...EXCEPT KYKM...THRU 17/18Z BEFORE THE STRATUS
DECK LIFTS WITH PRECIPITATION STARTING.  CIG/VIS WILL IMPROVE TO
MVFR/IFR BTWN 17/18Z THRU 18/03Z DUE TO POTENTIAL FOR RAIN AT
KDLS...KPDT...KALW...KPSC...AND KYKM WITH SNOW AT KRDM AND KBDN.
AFT 18/03Z...THE LOW STRATUS AND FOG BANK WILL REESTABLISH ITSELF
AND ONCE AGAIN RETURN CONDITIONS AT NEARLY ALL TAF SITES TO
LIFR/IFR.  WINDS WILL BE AOB 10 KTS DURING THE PERIOD.  AVIATION
DISCUSSIONS ARE NOT UPDATED FOR TAF AMENDMENTS.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98







000
FXUS66 KPDT 171153 AAB
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
355 AM PST WED DEC 17 2014

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. LOCALLY DENSE FOG AND FREEZING FOG AS WELL.
EXPECT THIS TO CONTINUE INTO THE MORNING THEN DISSIPATE BY
AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE THROUGH
OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW CLOUDS
AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE WILL
BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS OVER
THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE CONFIDENCE.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...12Z TAFS...LOW STRATUS AND FOG/FZFG/BR WILL CONTINUE
OVER THE NEXT 24 HOURS AT ALL TAF SITES. IFR/LIFR CONDITIONS WILL
CONTINUE AT ALL SITES...EXCEPT KYKM...THRU 17/18Z BEFORE THE STRATUS
DECK LIFTS WITH PRECIPITATION STARTING.  CIG/VIS WILL IMPROVE TO
MVFR/IFR BTWN 17/18Z THRU 18/03Z DUE TO POTENTIAL FOR RAIN AT
KDLS...KPDT...KALW...KPSC...AND KYKM WITH SNOW AT KRDM AND KBDN.
AFT 18/03Z...THE LOW STRATUS AND FOG BANK WILL REESTABLISH ITSELF
AND ONCE AGAIN RETURN CONDITIONS AT NEARLY ALL TAF SITES TO
LIFR/IFR.  WINDS WILL BE AOB 10 KTS DURING THE PERIOD.  AVIATION
DISCUSSIONS ARE NOT UPDATED FOR TAF AMENDMENTS.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ507-508.

     DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING WAZ029.

     AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98








000
FXUS66 KPDT 171131 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
332 AM PST WED DEC 17 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. EXPECT THIS TO CONTINUE INTO THE MORNING THEN
DISSIPATE BY AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE
THROUGH OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW
CLOUDS AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE
WILL BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS
OVER THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE CONFIDENCE.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...12Z TAFS...LOW STRATUS AND FOG/FZFG/BR WILL CONTINUE
OVER THE NEXT 24 HOURS AT ALL TAF SITES. IFR/LIFR CONDITIONS WILL
CONTINUE AT ALL SITES...EXCEPT KYKM...THRU 17/18Z BEFORE THE STRATUS
DECK LIFTS WITH PRECIPITATION STARTING.  CIG/VIS WILL IMPROVE TO
MVFR/IFR BTWN 17/18Z THRU 18/03Z DUE TO POTENTIAL FOR RAIN AT
KDLS...KPDT...KALW...KPSC...AND KYKM WITH SNOW AT KRDM AND KBDN.
AFT 18/03Z...THE LOW STRATUS AND FOG BANK WILL REESTABLISH ITSELF
AND ONCE AGAIN RETURN CONDITIONS AT NEARLY ALL TAF SITES TO
LIFR/IFR.  WINDS WILL BE AOB 10 KTS DURING THE PERIOD.  AVIATION
DISCUSSIONS ARE NOT UPDATED FOR TAF AMENDMENTS.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98








000
FXUS66 KPDT 171131 AAA
AFDPDT

AREA FORECAST DISCUSSION...UPDATE
NATIONAL WEATHER SERVICE PENDLETON OR
332 AM PST WED DEC 17 2014

UPDATED AVIATION DISCUSSION

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. EXPECT THIS TO CONTINUE INTO THE MORNING THEN
DISSIPATE BY AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE
THROUGH OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW
CLOUDS AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE
WILL BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS
OVER THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE CONFIDENCE.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...12Z TAFS...LOW STRATUS AND FOG/FZFG/BR WILL CONTINUE
OVER THE NEXT 24 HOURS AT ALL TAF SITES. IFR/LIFR CONDITIONS WILL
CONTINUE AT ALL SITES...EXCEPT KYKM...THRU 17/18Z BEFORE THE STRATUS
DECK LIFTS WITH PRECIPITATION STARTING.  CIG/VIS WILL IMPROVE TO
MVFR/IFR BTWN 17/18Z THRU 18/03Z DUE TO POTENTIAL FOR RAIN AT
KDLS...KPDT...KALW...KPSC...AND KYKM WITH SNOW AT KRDM AND KBDN.
AFT 18/03Z...THE LOW STRATUS AND FOG BANK WILL REESTABLISH ITSELF
AND ONCE AGAIN RETURN CONDITIONS AT NEARLY ALL TAF SITES TO
LIFR/IFR.  WINDS WILL BE AOB 10 KTS DURING THE PERIOD.  AVIATION
DISCUSSIONS ARE NOT UPDATED FOR TAF AMENDMENTS.  BIEDA

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98







000
FXUS66 KPDT 171050
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
244 AM PST WED DEC 17 2014

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. EXPECT THIS TO CONTINUE INTO THE MORNING THEN
DISSIPATE BY AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE
THROUGH OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW
CLOUDS AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE
WILL BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS
OVER THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE CONFIDENCE.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...PREVIOUS DISCUSSION...06Z TAFS...LOW STRATUS AND
FZFG/FOG/BR WILL PERSIST NEAR TAF SITES FOR THE NEXT 24 HOURS. KRDM
AND KBDN WILL BE AT IFR/LIFR LEVELS UNTIL LIGHT SNOW SHOWERS MOVE IN
AROUND 13-15Z WHEN CEILINGS WILL LIFT TO MVFR. SHOWERS WILL SWITCH
TO RAIN AFTER 18Z. KDLS WILL BE BELOW MINS (CIG LESS THAN 012) UNTIL
15Z. KPDT AND KALW WILL  HAVE CIGS BELOW 005 THROUGH 15Z WHEN RAIN
SHOWERS WILL DEVELOP AND IMPROVE CONDITIONS TO MVFR/VFR. KPSC AND
KYKM WILL REMAIN HAVE CIG AROUND 010-015 UNTIL 15-17Z WHEN RAIN
SHOWERS WILL HELP IMPROVE CONDITIONS TO MVFR/VFR. WINDS WILL REMAIN
BELOW 10 KTS FOR THE NEXT 24 HOURS. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98









000
FXUS66 KPDT 171050
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
244 AM PST WED DEC 17 2014

.SHORT TERM...TODAY THROUGH FRIDAY. WEAK UPPER LEVEL TROUGH MOVING
ACROSS THE FORECAST AREA TODAY WITH SOME LIGHT RAIN AND MOUNTAIN
SNOW. CURRENT SURFACE OBSERVATIONS SHOWING PLENTY OF LOW CLOUDS AND
FOG OVER THE REGION. EXPECT THIS TO CONTINUE INTO THE MORNING THEN
DISSIPATE BY AFTERNOON. ANOTHER SYSTEM JUST OFF THE COAST WILL MOVE
THROUGH OVERNIGHT WITH ADDITIONAL LIGHT RAIN AND MOUNTAIN SNOW. LOW
CLOUDS AND FOG WILL LIKELY REDEVELOP OVERNIGHT. AN UPPER LEVEL RIDGE
WILL BE OVER THE AREA THURSDAY. A FEW LINGERING LIGHT SNOW SHOWERS
OVER THE MOUNTAINS OTHERWISE MOSTLY CLOUDY WITH AREAS OF FOG IN THE
MORNING. A STRONGER UPPER LEVEL TROUGH WILL PUSH A COLD FRONT
THROUGH THE REGION LATE THURSDAY NIGHT INTO FRIDAY MORNING. THIS
WILL BRING A PERIOD OF RAIN AND MOUNTAIN SNOW. WINDS WILL INCREASE
WITH THE FRONTAL PASSAGE. WINDS REMAIN LIGHT TODAY AND THURSDAY
EXCEPT FOR SOME SOUTH WIND THROUGH THE GRANDE RONDE VALLEY. THE
FRONTAL PASSAGE ON FRIDAY WILL CAUSE AN INCREASE IN WINDS. 94

.LONG TERM...FRIDAY NIGHT THROUGH TUESDAY NIGHT...LATEST MODEL
GUIDANCE CONTINUES TO SHOW AN ACTIVE WEATHER PATTERN DURING THE
FORECAST PERIOD.  A SHORTWAVE TROUGH WILL BE EXITING THE AREA FRIDAY
NIGHT THRU EARLY SATURDAY WILL BRING A CHANCE OF RAIN-SNOW MIX TO
THE HIGHER ELEVATIONS OF THE CWA.  THE MAJOR HIGHLIGHT TO THE LONG
TERM IS A CHANGE IN THE LONGWAVE PATTERN THAT WILL BRING AN
IMPRESSIVE 150 KT JET WITH A POTENTIAL ATMOSPHERIC RIVER INTO THE
WASHINGTON STATE/OREGON AREA SATURDAY THRU MONDAY.  PRECIPITATION
CHANCES INCREASE INTO AT LEAST THE CHANCE CATEGORY SATURDAY NIGHT
THROUGH MIDDAY MONDAY AS MODEL GUIDANCE AND ENSEMBLE CONFIDENCE.
MOISTURE ADVECTION INTO THE REGION DURING THE PERIOD IS ABOUT 2 TO 3
STANDARD DEVIATIONS ABOVE NORMAL.  THE ORIGINS OF THE PACIFIC
AIRMASS...THOUGH...WILL ALLOW SNOW LEVELS TO GRADUALLY RISE AS THE
LONGWAVE TROUGH MOVES ACROSS THE REGION WITH ACCUMULATIONS ONLY
EXPECTED AT THE HIGHER ELEVATIONS OF THE CWA.  THE WEST-EAST JET
STREAM OVER THE REGION WILL HAVE VIGOROUS LOW-LEVEL JET SUPPORT
RANGING FROM 50-70 KTS FAVORING THE WASHINGTON STATE/OREGON BORDER.
HAVE ASSESSED CROSS-SECTIONS OVER THE FAVORED WIND PRONE REGIONS AND
FEEL THAT A MOUNTAIN WAVE MAY BE POSSIBLE OVER THE SIMCOE HIGHLANDS
AND THE IMMEDIATE EAST SLOPES OF THE CASCADES.  HAVE INCREASED WINDS
TO BETWEEN 30-50 KTS IN THOSE AREAS GIVEN THIS POTENTIAL SCENARIO
SUNDAY AND MONDAY.  BREEZY TO WINDY CONDITIONS MAY ALSO OCCUR ALONG
OTHER AREAS...THOUGH NOT TO THE MAGNITUDE EXPECTED IN THE AREAS
MENTIONED EARLIER. A LONG WAVE RIDGE WILL START TO BUILD IN BEHIND
THE TROUGH LATE MONDAY THRU TUESDAY THAT SHOULD ALLOW FOR
PRECIPITATION CHANCES TO DECREASE...THOUGH SOME SPILL OVER MOISTURE
ATOP THE RIDGE MAY ALLOW FOR A CHANCE OF PRECIPITATION FAVORING THE
EAST SLOPES OF THE WASHINGTON CASCADES.  TEMPERATURES DURING THE
EXTENDED PERIOD WILL BE 10 TO 15 DEGREES ABOVE NORMAL WITH A HIGHLY
ANOMALOUS PRECIPITATION EVENT POSSIBLE.  BIEDA

&&

.AVIATION...PREVIOUS DISCUSSION...06Z TAFS...LOW STRATUS AND
FZFG/FOG/BR WILL PERSIST NEAR TAF SITES FOR THE NEXT 24 HOURS. KRDM
AND KBDN WILL BE AT IFR/LIFR LEVELS UNTIL LIGHT SNOW SHOWERS MOVE IN
AROUND 13-15Z WHEN CEILINGS WILL LIFT TO MVFR. SHOWERS WILL SWITCH
TO RAIN AFTER 18Z. KDLS WILL BE BELOW MINS (CIG LESS THAN 012) UNTIL
15Z. KPDT AND KALW WILL  HAVE CIGS BELOW 005 THROUGH 15Z WHEN RAIN
SHOWERS WILL DEVELOP AND IMPROVE CONDITIONS TO MVFR/VFR. KPSC AND
KYKM WILL REMAIN HAVE CIG AROUND 010-015 UNTIL 15-17Z WHEN RAIN
SHOWERS WILL HELP IMPROVE CONDITIONS TO MVFR/VFR. WINDS WILL REMAIN
BELOW 10 KTS FOR THE NEXT 24 HOURS. 76

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  39  33  42  36 /  20  30  10  30
ALW  40  34  42  37 /  20  30  10  30
PSC  40  32  40  35 /  20  30  10  40
YKM  38  30  38  33 /  30  30  10  60
HRI  40  33  41  35 /  20  30  10  40
ELN  37  29  37  32 /  30  30  10  60
RDM  40  27  42  32 /  30  30  10  50
LGD  39  32  40  34 /  20  40  20  30
GCD  40  32  40  32 /  30  30  20  30
DLS  42  35  41  38 /  40  40  10  70

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...DENSE FOG ADVISORY UNTIL 10 AM PST THIS MORNING ORZ510-511.

WA...AIR STAGNATION ADVISORY UNTIL 10 AM PST FRIDAY WAZ026>028.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

97/98/98










    US Dept of Commerce
    National Oceanic and Atmospheric Administration
    National Weather Service
    1325 East West Highway
    Silver Spring, MD 20910
    Page Author: NWS Internet Services Team
Disclaimer
Information Quality
Credits
Glossary
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities