000
AGUS76 KPTR 211809
HMDPTR
HYDROMETEOROLOGICAL DISCUSSION
NORTHWEST RIVER FORECAST CENTER PORTLAND OR
11:05 AM PDT TUE MAY 21 2013
...LOCAL FLOODING IS FORECAST TO RESUME ON THE OKANOGAN RIVER TOWARD THE END
OF THIS WEEK. HIGH WATER IS ALSO POTENTIALLY EXPECTED LATER THIS WEEK THROUGH
NORTHEAST TO NORTH-CENTRAL WASHINGTON, NORTHERN IDAHO AND NORTHWEST MONTANA...
...HYDROMETEOROLOGICAL CONDITIONS...PAST 24 HOURS...4 AM - 4 AM...
EARLY TUESDAY MORNING LIGHT RAIN AND LOWERING MOUNTAIN SNOW WITH A COLD CORE
ALASKA LOW STARTED SHIFTING INTO OUR NORTHWESTERN TIER...DISPLACING A TRANSIENT
RIDGE THAT RESULTED IN MOSTLY DRY MONDAY CONDITIONS AND TYPICALLY 3 TO 7 DEGREE
ABOVE NORMAL TEMPERATURES. THIS MORNING FREEZING LEVELS RANGED BETWEEN 3900 FEET
AT QUILLAYUTE...TO 10900 FEET AT BOISE.
...OBSERVED HYDROLOGIC CONDITIONS...
EXCEPT FOR SOME MINOR WESTERN WASHINGTON PRECIPITATION DRIVEN RISES...RE-
CESSIONS TENDED TO DOMINATE FLOWS ACROSS THE REGION. NEAR THE U.S.CANADIAN
BORDER A NUMBER OF FLOWS STILL REMAIN CLOSE TO ACTION LEVELS.
...HYDROMETEOROLOGICAL FORECAST...MAY 21 - MAY 25...
TUESDAY A COLD CORE GULF OF ALASKA LOW WITH 7 TO 9 DEGREE BELOW NORMAL
TEMPERATURES SAGS OCCASIONAL VALLEY RAIN AND LOWERING MOUNTAIN SNOW INTO OUR
NORTHWESTERN TIER. WEDNESDAY THE OCCLUSION OF THIS UNSETTLED LOW ENTRAINS SOME
GULF OF MEXICO MOISTURE INTO A STALLED RAIN AND LOWERING SNOW PATTERN OVER THE
UPPER COLUMBIA. POTENTIAL EMBEDDED CONVECTION IN THIS UPPER COLUMBIA FORECAST
PROBLEM COULD RESULT IN OCCASIONAL LOCAL HEAVY RAIN AND SNOW IN SOUTH EASTERN
BRITISH COLUMBIA...NORTHWESTERN MONTANA...NORTHERN IDAHO...AND NORTH EASTERN TO
NORTH CENTRAL WASHINGTON WEDNESDAY TO FRIDAY. LOOK FOR COLDEST 8 TO 17 DEGREE
BELOW NORMAL TEMPERATURES AROUND WEDNESDAY. SATURDAY THE LOW OVER US TENDS TO
LOSE ORGANIZATION AND ACCESS TO FURTHER MOISTURE TAPS...AND THIS ENDS THE
PERIOD WITH DIMINISHING MIXED SHOWERS TRAILING OFF ACROSS THE REGION...AND
TEMPERATURES WARMING TO NEAR NORMAL VALUES.
...HYDROLOGIC CONDITIONS...
EXPECT EARLY PERIOD MOSTLY FLAT TO RECEDING FLOWS TO DOMINATE THE REGION...BUT
MINOR TUESDAY NORTHWESTERN TIER LOWER ELEVATION STREAM RISES ARE A PRELUDE TO
WHAT COULD BECOME LOCALLY SHARPENING NORTHEASTERN TIER UPPER COLUMBIA WEDNESDAY
TO FRIDAY RISES. THESE MID TO LATER PERIOD NORTHEASTERN TIER RISES ARE EXPECTED
TO BE SUBSTANTIALLY ATTENUATED BY TYPING OUT LARGE AMOUNTS OF MID TO HIGHER EL-
EVATION ACCUMULATIONS AS SNOW. BUT POTENTIALLY HEAVY LOCAL CONVECTIVE MID-LATE
PERIOD RAIN-FORCED SHARP RISES SCATTERED ACROSS THE UPPER COLUMBIA CAN NOT BE
RULED OUT ENTIRELY AT THIS TIME.
...6-10 DAY OUTLOOK...MAY 26 - MAY 30...
STILL LOOKS LIKE OUR REGION IS GOING TO BE DOMINATED BY THE SLOWLY DECAYING
REMNANTS OF AN UPPER LEVEL LOW CENTERED OVER OUR FORECAST AREA THAT...ALONG WITH
A FOLLOWING GENERAL TROUGHY PATTERN...CONTINUES PINWHEELING OCCASIONAL SCATTERED
MIXED SHOWERS OVER US THROUGH THIS FORECAST PERIOD. THIS FAIRLY STEADY STATE
PATTERN TENDS TO KEEP OUR TEMPERATURES NEAR NORMAL.
ML/KB/CO/BG
VISIT US ON THE WEB AT HTTP://WWW.NWRFC.NOAA.GOV FOR DETAILED
GRAPHICAL PRECIPITATION...FREEZING LEVEL...AND TEMPERATURE FORECASTS.
$$
000
AGUS76 KPTR 201818
HMDPTR
HYDROMETEOROLOGICAL DISCUSSION
NORTHWEST RIVER FORECAST CENTER PORTLAND OR
11:15 AM PDT MON MAY 20 2013
...LOCAL FLOODING IS FORECAST TO RESUME ON THE OKANOGAN RIVER TOWARD THE END
OF THIS WEEK. HIGH WATER IS ALSO POTENTIALLY EXPECTED LATER THIS WEEK THROUGH
NORTHEAST TO NORTH-CENTRAL WASHINGTON, NORTHERN IDAHO AND NORTHWEST MONTANA...
...HYDROMETEOROLOGICAL CONDITIONS...PAST 24 HOURS...4 AM - 4 AM...
A LINGERING WEAK ONSHORE TROUGHY PATTERN ACROSS THE REGION RESULTED IN SOME
MIXES OF OCCASIONAL SCATTERED LIGHT VALLEY RAIN SHOWERS AND MOUNTAIN SNOW ACROSS
OUR FORECAST AREA. SUNDAY TEMPERATURES TENDED TO BE GENERALLY AROUND 3 TO 7
DEGREES BELOW NORMAL. THIS MORNING FREEZING LEVELS RANGED BETWEEN 8600 FEET AT
SPOKANE...TO 12800 FEET AT MEDFORD.
...OBSERVED HYDROLOGIC CONDITIONS...
RECESSIONS TENDED TO DOMINATE FLOWS ACROSS THE REGION...BUT NEAR THE U.S.
CANADIAN BORDER A NUMBER OF FLOWS STILL REMAIN CLOSE TO ACTION LEVELS.
...HYDROMETEOROLOGICAL FORECAST...MAY 20 - MAY 24...
MONDAY STILL LOOKS TO BE MOSTLY DRY AS A TRANSIENT RIDGE WARMS UP MOST LOCA-
TIONS AROUND 3 TO 6 DEGREES ABOVE NORMAL. TUESDAY A COLD CORE GULF OF ALASKA LOW
WITH 9 TO 10 DEGREE BELOW NORMAL TEMPERATURES SAGS OCCASIONAL VALLEY RAIN AND
LOWERING MOUNTAIN SNOW INTO OUR NORTHWESTERN TIER TUESDAY. WEDNESDAY THE OCCLU-
SION OF THIS UNSETTLED LOW ENTRAINS SOME GULF OF MEXICO MOISTURE INTO AN EAST-
WARD SHIFTING RAIN AND LOWERING SNOW PATTERN OVER THE UPPER COLUMBIA. POTENTIAL
EMBEDDED CONVECTION IN THIS UPPER COLUMBIA FORECAST PROBLEM COULD RESULT IN
OCCASIONAL LOCAL HEAVY RAIN IN SOUTH EASTERN BRITISH COLUMBIA...NORTHWESTERN
MONTANA...NORTHERN IDAHO...AND NORTH EASTERN TO NORTH CENTRAL WASHINGTON WEDNES-
DAY TO FRIDAY. LOOK FOR COLDEST 7 TO 16 DEGREE BELOW NORMAL TEMPERATURES AROUND
WEDNESDAY.
...HYDROLOGIC CONDITIONS...
EXPECT EARLY TO MID PERIOD FLAT TO RECEDING FLOWS TO DOMINATE THE REGION...
BUT MINOR TUESDAY NORTHWESTERN TIER LOWER ELEVATION STREAM RISES ARE A PRELUDE
TO WHAT COULD BECOME LOCALLY SHARPENING NORTHEASTERN TIER UPPER COLUMBIA WEDNES-
DAY TO FRIDAY RISES FROM POTENTIALLY HEAVY LOCAL RAIN AT TIMES ACROSS SOUTH-
EASTERN BRITISH COLUMBIA...NORTHWESTERN MONTANA...NORTHERN IDAHO...AND NORTH-
EASTERN TO NORTH-CENTRAL WASHINGTON.
...6-10 DAY OUTLOOK...MAY 25 - MAY 29...
STILL LOOKS LIKE OUR REGION IS GOING TO BE DOMINATED BY THE SLOWLY DECAYING
REMNANTS OF AN UPPER LEVEL LOW CENTERED OVER OUR FORECAST AREA THAT CONTINUES
PINWHEELING OCCASIONAL SCATTERED MIXED SHOWERS OVER US THROUGH THIS FORECAST
PERIOD. AS THIS LOW GRADUALLY OPENS UP WE SHOULD SEE TEMPERATURES START TO
GRADUALLY WARM UP...ENDING THE PERIOD TYPICALLY AROUND NEAR TO 6 DEGREES ABOVE
NORMAL.
ML/RF/CO/BG
VISIT US ON THE WEB AT HTTP://WWW.NWRFC.NOAA.GOV FOR DETAILED
GRAPHICAL PRECIPITATION...FREEZING LEVEL...AND TEMPERATURE FORECASTS.
$$
000
AGUS76 KPTR 191847
HMDPTR
HYDROMETEOROLOGICAL DISCUSSION
NORTHWEST RIVER FORECAST CENTER PORTLAND OR
11:40 AM PDT SUN MAY 19 2013
...LOCAL FLOODING IS FORECAST TO RESUME ON THE OKANOGAN RIVER TOWARD THE END
OF THIS WEEK. HIGH WATER IS ALSO POTENTIALLY EXPECTED LATER THIS WEEK THROUGH
NORTHEAST TO NORTH-CENTRAL WASHINGTON, NORTHERN IDAHO AND NORTHWEST MONTANA...
...HYDROMETEOROLOGICAL CONDITIONS...PAST 24 HOURS...4 AM - 4 AM...
A LINGERING WEAK ONSHORE TROUGHY PATTERN ACROSS THE REGION RESULTED IN MORE
MIXES OF OCCASIONAL SCATTERED LIGHT VALLEY RAIN SHOWERS AND MOUNTAIN SNOW ACROSS
MUCH OF OUR FORECAST AREA. SATURDAY TEMPERATURES TENDED TO BE GENERALLY AROUND 5
TO 11 DEGREES BELOW NORMAL. THIS MORNING FREEZING LEVELS RANGED BETWEEN 6400
FEET AT QUILLAYUTE...TO 8400 FEET AT MEDFORD.
...OBSERVED HYDROLOGIC CONDITIONS...
RECESSIONS TENDED TO DOMINATE FLOWS ACROSS THE REGION...BUT NEAR THE U.S.
CANADIAN BORDER A NUMBER OF FLOWS STILL REMAIN CLOSE TO ACTION LEVELS.
...HYDROMETEOROLOGICAL FORECAST...MAY 19 - MAY 23...
SCATTERED LIGHT MIXED SHOWERS TRAIL OFF EASTWARD ACROSS THE REGION SUNDAY...
WITH MONDAY LOOKING TO BE MOSTLY DRY AS A TRANSIENT RIDGE WARMS UP MOST LOCA-
TIONS AROUND 4 TO 8 DEGREES ABOVE NORMAL. TUESDAY A COLD CORE GULF OF ALASKA LOW
WITH 4 TO 9 DEGREE BELOW NORMAL TEMPERATURES SAGS OCCASIONAL VALLEY RAIN AND
LOWERING MOUNTAIN SNOW INTO OUR NORTHWESTERN TIER TUESDAY. WEDNESDAY THE OCCLU-
SION OF THIS UNSETTLED LOW ENTRAINS SOME GULF OF MEXICO MOISTURE INTO AN EAST-
WARD SHIFTING RAIN PATTERN OVER THE UPPER COLUMBIA. EMBEDDED CONVECTION IN THIS
UPPER COLUMBIA DAY-4 FORECAST PROBLEM COULD RESULT IN LOCAL HEAVY RAIN IN SOUTH
EASTERN BRITISH COLUMBIA...NORTHWESTERN MONTANA...NORTHERN IDAHO...AND NORTH
EASTERN TO NORTH CENTRAL WASHINGTON.
...HYDROLOGIC CONDITIONS...
EXPECT EARLY TO MID PERIOD FLAT TO RECEDING FLOWS TO DOMINATE THE REGION...
BUT MINOR TUESDAY NORTHWESTERN TIER LOWER ELEVATION STREAM RISES ARE A PRELUDE
TO WHAT COULD BECOME LOCALLY SHARPENING NORTHEASTERN TIER UPPER COLUMBIA WEDNES-
DAY RISES FROM POTENTIALLY HEAVY LOCAL RAIN AT TIMES ACROSS SOUTHEASTERN BRITISH
COLUMBIA...NORTHWESTERN MONTANA...NORTHERN IDAHO...AND NORTHEASTERN TO NORTH-
CENTRAL WASHINGTON.
...6-10 DAY OUTLOOK...MAY 24 - MAY 28...
STILL LOOKS LIKE OUR REGION IS GOING TO BE DOMINATED BY THE SLOWLY DECAYING
REMNANTS OF AN UPPER LEVEL LOW CENTERED OVER OUR FORECAST AREA THAT CONTINUES
PINWHEELING GRADUALLY DIMINISHING SCATTERED MIXED SHOWERS OVER US THROUGH THIS
FORECAST PERIOD. AS THIS LOW GRADUALLY OPENS UP WE SHOULD SEE TEMPERATURES START
TO GRADUALLY WARM UP...ENDING THE PERIOD TYPICALLY AROUND 3 TO 7 DEGREES ABOVE
NORMAL.
ML/RF/TD
VISIT US ON THE WEB AT HTTP://WWW.NWRFC.NOAA.GOV FOR DETAILED
GRAPHICAL PRECIPITATION...FREEZING LEVEL...AND TEMPERATURE FORECASTS.
$$
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