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000
FXHW60 PHFO 192019
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1019 AM HST SAT APR 19 2014

.SYNOPSIS...
BREEZY TRADE WINDS WILL CONTINUE THROUGH THE WEEK WITH SHOWERS
FOCUSING OVER THE WINDWARD SLOPES. LEEWARD AREAS OF THE SMALLER
ISLANDS WILL SEE A FEW SHOWERS IN THE EARLY MORNING AND LATE
AFTERNOON.

&&

.DISCUSSION...
HIGH PRESSURE NORTH OF THE STATE IS PROVIDING STEADY TRADE WINDS
ACROSS THE ISLANDS TODAY. WINDWARD SHOWERS ARE BRINGING CLOUDS AND
LIGHT RAINFALL ALONG THE WINDWARD SLOPES. TRADE WINDS WILL CONTINUE
THROUGH THE FORECAST PERIOD WITH AN UPTICK IN WINDS AND SHOWERS
EXPECTED SUNDAY THROUGH TUESDAY.

HIGH PRESSURE MOVING IN FROM THE WEST WILL BUILD NORTH OF HAWAII
TONIGHT AND SUNDAY. THE PRESSURE GRADIENT WILL TIGHTEN FROM N TO S
ACROSS THE AREA AS THE HIGH BUILDS...AND WINDS WILL INCREASE IN
RESPONSE. A WIND ADVISORY MAY BE NECESSARY ACROSS THE WINDIER
AREAS OF THE BIG ISLAND AND MAUI COUNTY SUNDAY AS THE WINDS
INCREASE. TUESDAY...THE HIGH WILL PUSH TOWARD THE EAST PACIFIC
AS A WEAK FRONT MOVES ACROSS THE DATELINE. WINDS OVER THE STATE
WILL DECREASE TO MODERATE TRADES AS THE HIGH MOVES INTO THE EAST
PACIFIC FOR THE SECOND HALF OF THE WEEK.

CURRENT PRECIPITABLE WATER VALUES ARE BELOW NORMAL NEAR THE
ISLANDS AND SHOWERS HAVE BEEN LIMITED. THE MIMIC PRECIP WATER
FIELD SHOWS AN INCREASE IN MOISTURE UPSTREAM OF THE ISLANDS NEAR
150W AND 24N. THIS MOISTURE IS EXPECTED TO INCREASE WINDWARD
SHOWERS TONIGHT THROUGH TUESDAY NIGHT AS THE MOISTURE MOVES ACROSS THE
AREA.


&&


.AVIATION...
TRADE WIND FLOW CONTINUES...RESULTING IN AIRMET TANGO FOR TURBULENCE
TO THE LEE OF THE ALL ISLANDS. TRADES ARE EXPECTED TO INCREASE THROUGH
THE WEEKEND...SO EXPECTING THE AIRMET TO CONTINUE.

CLOUDS AND SHOWERS BEING CARRIED IN ON THE TRADES WILL BRING MVFR
CONDITIONS MAINLY TO WINDWARD AND MAUKA AREAS FROM TIME TO
TIME...AND ISOLATED IFR CONDITIONS ARE POSSIBLE. OTHERWISE VFR
CONDITIONS ARE EXPECTED TO PREVAIL OVER LEEWARD AREAS.


&&

.MARINE...
THE SMALL CRAFT ADVISORY COVERS ALL HAWAIIAN COASTAL WATERS DUE TO
SEAS AND WINDS. WINDS SHOULD ONLY INCREASE FURTHER WITH TIME AS HIGH
PRESSURE BUILDS TO OUR NORTH...AND THE SCA EXTENDS THROUGH
MONDAY. WINDS MAY REACH NEAR GALE FORCE AT TIMES SUNDAY THROUGH
MONDAY IN THE ALENUIHAHA CHANNEL.

A SMALL TO MODERATE NORTHWEST SWELL WILL BUILD LATER TODAY AND
TONIGHT...THEN DECLINE SUNDAY EVENING. ANOTHER MODERATE NORTHWEST
SWELL IS EXPECTED NEXT WEDNESDAY NIGHT AND WILL CONTINUE THROUGH
THE END OF NEXT WEEK. STRENGTHENING TRADE WINDS WILL PRODUCE SHORT
PERIOD...CHOPPY SURF ALONG EAST FACING SHORES...LIKELY REACHING
ADVISORY LEVELS ON EAST FACING SHORES BY LATE SUNDAY OR MONDAY.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR ALL HAWAIIAN
WATERS-


&&

$$

MORRISON...DISCUSSION/MARINE
M BALLARD...AVIATION






000
FXHW60 PHFO 192019
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1019 AM HST SAT APR 19 2014

.SYNOPSIS...
BREEZY TRADE WINDS WILL CONTINUE THROUGH THE WEEK WITH SHOWERS
FOCUSING OVER THE WINDWARD SLOPES. LEEWARD AREAS OF THE SMALLER
ISLANDS WILL SEE A FEW SHOWERS IN THE EARLY MORNING AND LATE
AFTERNOON.

&&

.DISCUSSION...
HIGH PRESSURE NORTH OF THE STATE IS PROVIDING STEADY TRADE WINDS
ACROSS THE ISLANDS TODAY. WINDWARD SHOWERS ARE BRINGING CLOUDS AND
LIGHT RAINFALL ALONG THE WINDWARD SLOPES. TRADE WINDS WILL CONTINUE
THROUGH THE FORECAST PERIOD WITH AN UPTICK IN WINDS AND SHOWERS
EXPECTED SUNDAY THROUGH TUESDAY.

HIGH PRESSURE MOVING IN FROM THE WEST WILL BUILD NORTH OF HAWAII
TONIGHT AND SUNDAY. THE PRESSURE GRADIENT WILL TIGHTEN FROM N TO S
ACROSS THE AREA AS THE HIGH BUILDS...AND WINDS WILL INCREASE IN
RESPONSE. A WIND ADVISORY MAY BE NECESSARY ACROSS THE WINDIER
AREAS OF THE BIG ISLAND AND MAUI COUNTY SUNDAY AS THE WINDS
INCREASE. TUESDAY...THE HIGH WILL PUSH TOWARD THE EAST PACIFIC
AS A WEAK FRONT MOVES ACROSS THE DATELINE. WINDS OVER THE STATE
WILL DECREASE TO MODERATE TRADES AS THE HIGH MOVES INTO THE EAST
PACIFIC FOR THE SECOND HALF OF THE WEEK.

CURRENT PRECIPITABLE WATER VALUES ARE BELOW NORMAL NEAR THE
ISLANDS AND SHOWERS HAVE BEEN LIMITED. THE MIMIC PRECIP WATER
FIELD SHOWS AN INCREASE IN MOISTURE UPSTREAM OF THE ISLANDS NEAR
150W AND 24N. THIS MOISTURE IS EXPECTED TO INCREASE WINDWARD
SHOWERS TONIGHT THROUGH TUESDAY NIGHT AS THE MOISTURE MOVES ACROSS THE
AREA.


&&


.AVIATION...
TRADE WIND FLOW CONTINUES...RESULTING IN AIRMET TANGO FOR TURBULENCE
TO THE LEE OF THE ALL ISLANDS. TRADES ARE EXPECTED TO INCREASE THROUGH
THE WEEKEND...SO EXPECTING THE AIRMET TO CONTINUE.

CLOUDS AND SHOWERS BEING CARRIED IN ON THE TRADES WILL BRING MVFR
CONDITIONS MAINLY TO WINDWARD AND MAUKA AREAS FROM TIME TO
TIME...AND ISOLATED IFR CONDITIONS ARE POSSIBLE. OTHERWISE VFR
CONDITIONS ARE EXPECTED TO PREVAIL OVER LEEWARD AREAS.


&&

.MARINE...
THE SMALL CRAFT ADVISORY COVERS ALL HAWAIIAN COASTAL WATERS DUE TO
SEAS AND WINDS. WINDS SHOULD ONLY INCREASE FURTHER WITH TIME AS HIGH
PRESSURE BUILDS TO OUR NORTH...AND THE SCA EXTENDS THROUGH
MONDAY. WINDS MAY REACH NEAR GALE FORCE AT TIMES SUNDAY THROUGH
MONDAY IN THE ALENUIHAHA CHANNEL.

A SMALL TO MODERATE NORTHWEST SWELL WILL BUILD LATER TODAY AND
TONIGHT...THEN DECLINE SUNDAY EVENING. ANOTHER MODERATE NORTHWEST
SWELL IS EXPECTED NEXT WEDNESDAY NIGHT AND WILL CONTINUE THROUGH
THE END OF NEXT WEEK. STRENGTHENING TRADE WINDS WILL PRODUCE SHORT
PERIOD...CHOPPY SURF ALONG EAST FACING SHORES...LIKELY REACHING
ADVISORY LEVELS ON EAST FACING SHORES BY LATE SUNDAY OR MONDAY.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR ALL HAWAIIAN
WATERS-


&&

$$

MORRISON...DISCUSSION/MARINE
M BALLARD...AVIATION






  [top]

000
ATHW40 PHFO 191829
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1830 UTC SAT APR 19 2014

BASED ON DATA THROUGH 1800 UTC APRIL 19 2014

A STABLE TRADE WIND FLOW DOMINATES ACROSS MOST OF THE REGION...WHILE
A WEAK UPPER LEVEL LOW IS SPINNING ABOUT 600 MILES TO THE SOUTHWEST
OF THE MAIN HAWAIIAN ISLANDS.

THE TRADE WINDS ARE BEING DRIVEN BY A SURFACE HIGH CENTERED NORTH OF
30N AND ARE ONLY PARTIALLY INTERRUPTED BY A DISSIPATING FRONT
LOCATED 500 MILES NORTH OF KAUAI. THE NEARLY STATIONARY FEATURE IS
MARKED BY A 100 MILE-WIDE BAND OF OVERCAST LOW CLOUDS CENTERED ALONG
30N161W...27N170W...AND 28N175W.

OVER THE MAIN HAWAIIAN ISLANDS...THE FIRST VISIBLE IMAGES OF THE DAY
SHOW A MIX OF SCATTERED TO LOCALLY BROKEN STRATOCUMULUS CLOUDS
MOVING IN THE TRADE WIND FLOW FROM THE EAST AT 20 TO 25 MPH. THESE
CLOUDS ARE PILING UP ON WINDWARD SLOPES OF ALL ISLANDS...WHILE
LEEWARD AREAS ARE MOSTLY FREE OF LOW CLOUDS. CLOUD COVER INCREASES
SUBSTANTIALLY TO THE EAST OF THE STATE. A FIELD OF BROKEN
STRATOCUMULUS WITH A FEW EMBEDDED CUMULUS CLOUDS RUNS BETWEEN 27N
AND 17N EAST OF 155W.

A WEAK NEARLY STATIONARY UPPER LEVEL LOW IS CENTERED SOUTHWEST OF
THE ISLANDS NEAR 16N165W. THIS FEATURE IS DRIVING A NARROW BAND OF
OVERCAST LAYERED CLOUDS ON ITS SOUTHEAST FLANK ALONG 17N160W...
14N161W...AND 11N163W. LIGHTNING DETECTION PICKED UP A THUNDERSTORM
OVERNIGHT...AND TOPS CONTINUE TO RISE AS HIGH AS 45000 FT. THE UPPER
LOW IS ALSO GENERATING A SHIELD OF BROKEN HIGH CLOUDS FROM 17N TO
21N BETWEEN 166W AND 153W. THESE CLOUDS HAVE THINNED OVER THE STATE
SINCE LAST NIGHT.

$$

DWROE





000
ATHW40 PHFO 191829
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1830 UTC SAT APR 19 2014

BASED ON DATA THROUGH 1800 UTC APRIL 19 2014

A STABLE TRADE WIND FLOW DOMINATES ACROSS MOST OF THE REGION...WHILE
A WEAK UPPER LEVEL LOW IS SPINNING ABOUT 600 MILES TO THE SOUTHWEST
OF THE MAIN HAWAIIAN ISLANDS.

THE TRADE WINDS ARE BEING DRIVEN BY A SURFACE HIGH CENTERED NORTH OF
30N AND ARE ONLY PARTIALLY INTERRUPTED BY A DISSIPATING FRONT
LOCATED 500 MILES NORTH OF KAUAI. THE NEARLY STATIONARY FEATURE IS
MARKED BY A 100 MILE-WIDE BAND OF OVERCAST LOW CLOUDS CENTERED ALONG
30N161W...27N170W...AND 28N175W.

OVER THE MAIN HAWAIIAN ISLANDS...THE FIRST VISIBLE IMAGES OF THE DAY
SHOW A MIX OF SCATTERED TO LOCALLY BROKEN STRATOCUMULUS CLOUDS
MOVING IN THE TRADE WIND FLOW FROM THE EAST AT 20 TO 25 MPH. THESE
CLOUDS ARE PILING UP ON WINDWARD SLOPES OF ALL ISLANDS...WHILE
LEEWARD AREAS ARE MOSTLY FREE OF LOW CLOUDS. CLOUD COVER INCREASES
SUBSTANTIALLY TO THE EAST OF THE STATE. A FIELD OF BROKEN
STRATOCUMULUS WITH A FEW EMBEDDED CUMULUS CLOUDS RUNS BETWEEN 27N
AND 17N EAST OF 155W.

A WEAK NEARLY STATIONARY UPPER LEVEL LOW IS CENTERED SOUTHWEST OF
THE ISLANDS NEAR 16N165W. THIS FEATURE IS DRIVING A NARROW BAND OF
OVERCAST LAYERED CLOUDS ON ITS SOUTHEAST FLANK ALONG 17N160W...
14N161W...AND 11N163W. LIGHTNING DETECTION PICKED UP A THUNDERSTORM
OVERNIGHT...AND TOPS CONTINUE TO RISE AS HIGH AS 45000 FT. THE UPPER
LOW IS ALSO GENERATING A SHIELD OF BROKEN HIGH CLOUDS FROM 17N TO
21N BETWEEN 166W AND 153W. THESE CLOUDS HAVE THINNED OVER THE STATE
SINCE LAST NIGHT.

$$

DWROE





000
ATHW40 PHFO 191829
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1830 UTC SAT APR 19 2014

BASED ON DATA THROUGH 1800 UTC APRIL 19 2014

A STABLE TRADE WIND FLOW DOMINATES ACROSS MOST OF THE REGION...WHILE
A WEAK UPPER LEVEL LOW IS SPINNING ABOUT 600 MILES TO THE SOUTHWEST
OF THE MAIN HAWAIIAN ISLANDS.

THE TRADE WINDS ARE BEING DRIVEN BY A SURFACE HIGH CENTERED NORTH OF
30N AND ARE ONLY PARTIALLY INTERRUPTED BY A DISSIPATING FRONT
LOCATED 500 MILES NORTH OF KAUAI. THE NEARLY STATIONARY FEATURE IS
MARKED BY A 100 MILE-WIDE BAND OF OVERCAST LOW CLOUDS CENTERED ALONG
30N161W...27N170W...AND 28N175W.

OVER THE MAIN HAWAIIAN ISLANDS...THE FIRST VISIBLE IMAGES OF THE DAY
SHOW A MIX OF SCATTERED TO LOCALLY BROKEN STRATOCUMULUS CLOUDS
MOVING IN THE TRADE WIND FLOW FROM THE EAST AT 20 TO 25 MPH. THESE
CLOUDS ARE PILING UP ON WINDWARD SLOPES OF ALL ISLANDS...WHILE
LEEWARD AREAS ARE MOSTLY FREE OF LOW CLOUDS. CLOUD COVER INCREASES
SUBSTANTIALLY TO THE EAST OF THE STATE. A FIELD OF BROKEN
STRATOCUMULUS WITH A FEW EMBEDDED CUMULUS CLOUDS RUNS BETWEEN 27N
AND 17N EAST OF 155W.

A WEAK NEARLY STATIONARY UPPER LEVEL LOW IS CENTERED SOUTHWEST OF
THE ISLANDS NEAR 16N165W. THIS FEATURE IS DRIVING A NARROW BAND OF
OVERCAST LAYERED CLOUDS ON ITS SOUTHEAST FLANK ALONG 17N160W...
14N161W...AND 11N163W. LIGHTNING DETECTION PICKED UP A THUNDERSTORM
OVERNIGHT...AND TOPS CONTINUE TO RISE AS HIGH AS 45000 FT. THE UPPER
LOW IS ALSO GENERATING A SHIELD OF BROKEN HIGH CLOUDS FROM 17N TO
21N BETWEEN 166W AND 153W. THESE CLOUDS HAVE THINNED OVER THE STATE
SINCE LAST NIGHT.

$$

DWROE





000
ATHW40 PHFO 191829
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1830 UTC SAT APR 19 2014

BASED ON DATA THROUGH 1800 UTC APRIL 19 2014

A STABLE TRADE WIND FLOW DOMINATES ACROSS MOST OF THE REGION...WHILE
A WEAK UPPER LEVEL LOW IS SPINNING ABOUT 600 MILES TO THE SOUTHWEST
OF THE MAIN HAWAIIAN ISLANDS.

THE TRADE WINDS ARE BEING DRIVEN BY A SURFACE HIGH CENTERED NORTH OF
30N AND ARE ONLY PARTIALLY INTERRUPTED BY A DISSIPATING FRONT
LOCATED 500 MILES NORTH OF KAUAI. THE NEARLY STATIONARY FEATURE IS
MARKED BY A 100 MILE-WIDE BAND OF OVERCAST LOW CLOUDS CENTERED ALONG
30N161W...27N170W...AND 28N175W.

OVER THE MAIN HAWAIIAN ISLANDS...THE FIRST VISIBLE IMAGES OF THE DAY
SHOW A MIX OF SCATTERED TO LOCALLY BROKEN STRATOCUMULUS CLOUDS
MOVING IN THE TRADE WIND FLOW FROM THE EAST AT 20 TO 25 MPH. THESE
CLOUDS ARE PILING UP ON WINDWARD SLOPES OF ALL ISLANDS...WHILE
LEEWARD AREAS ARE MOSTLY FREE OF LOW CLOUDS. CLOUD COVER INCREASES
SUBSTANTIALLY TO THE EAST OF THE STATE. A FIELD OF BROKEN
STRATOCUMULUS WITH A FEW EMBEDDED CUMULUS CLOUDS RUNS BETWEEN 27N
AND 17N EAST OF 155W.

A WEAK NEARLY STATIONARY UPPER LEVEL LOW IS CENTERED SOUTHWEST OF
THE ISLANDS NEAR 16N165W. THIS FEATURE IS DRIVING A NARROW BAND OF
OVERCAST LAYERED CLOUDS ON ITS SOUTHEAST FLANK ALONG 17N160W...
14N161W...AND 11N163W. LIGHTNING DETECTION PICKED UP A THUNDERSTORM
OVERNIGHT...AND TOPS CONTINUE TO RISE AS HIGH AS 45000 FT. THE UPPER
LOW IS ALSO GENERATING A SHIELD OF BROKEN HIGH CLOUDS FROM 17N TO
21N BETWEEN 166W AND 153W. THESE CLOUDS HAVE THINNED OVER THE STATE
SINCE LAST NIGHT.

$$

DWROE





000
FXHW60 PHFO 191340
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
340 AM HST SAT APR 19 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN WILL CONTINUE THROUGH THE NEXT
SEVERAL DAYS ACROSS HAWAII...THANKS TO HIGH PRESSURE NORTH OF THE
STATE. SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW
SHOWERS POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
SHOWERS HAVE BECOME RATHER SPARSE OVER THE STATE DURING THE PAST
SEVERAL HOURS...WITH RADAR AND RAIN GAUGE DATA SHOWING ONLY VERY
LIGHT RAINFALL AMOUNTS ACROSS SOME WINDWARD AREAS. THE 12Z
SOUNDINGS SHOW A LOWERING OF THE INVERSION AS EXPECTED...WITH THE
BASE DOWN TO BETWEEN 5700 AND 6700 FEET...FROM ABOUT 9000 FEET 12
HOURS EARLIER. THIS IS CONSISTENT WITH MIMIC-TPW SATELLITE DATA
WHICH INDICATE A DRIER AIRMASS SPREADING INTO THE STATE FROM THE
EAST. EARLIER MODEL DATA SUGGESTED THAT THIS DRYING WOULD TAKE
PLACE PRIMARILY IN THE 850-700 MB LAYER...AGAIN CONSISTENT WITH
THE 12Z RAOB DATA. SATELLITE IMAGERY DEPICTS ABUNDANT HIGH
LEVEL CLOUDINESS STREAMING NORTHWARD ACROSS THE STATE...TO THE
EAST OF A MID/UPPER LEVEL TROUGH CENTERED SEVERAL HUNDRED MILES
TO THE SOUTHWEST. AT THE SURFACE...A 1023 MB HIGH IS CENTERED WELL
NORTHEAST OF THE STATE...WITH A STRONGER 1028 MB HIGH BUILDING
EASTWARD FROM THE DATELINE NORTH OF 30N.

FOR TODAY...EXPECT SHOWER COVERAGE TO REMAIN FAIRLY SPARSE WITH
LIGHT RAINFALL AMOUNTS EVEN ACROSS WINDWARD SECTIONS...AS STABLE
AND DRY CONDITIONS CONTINUE. TONIGHT...SATELLITE AND MODEL DATA
INDICATE THAT ANOTHER AREA OF HIGHER MOISTURE WILL BE MOVING INTO
THE STATE...ALTHOUGH MODEL SOUNDINGS SHOW THE INVERSION REMAINING
FAIRLY LOW. WITH BRISK TRADES IN PLACE...THE INFLUX OF ADDITIONAL
LOW LEVEL MOISTURE SHOULD BE SUFFICIENT TO INCREASE SHOWER
ACTIVITY ONCE AGAIN ACROSS WINDWARD/MAUKA AREAS...WITH SOME
SPILLOVER INTO LEEWARD.

SUNDAY THROUGH MONDAY NIGHT...RATHER STRONG HIGH PRESSURE WILL
PASS NORTH OF THE STATE...CAUSING TRADES TO INCREASE FURTHER.
ALOFT...GUIDANCE INDICATES THAT THE MID/UPPER TROUGH TO OUR
SOUTHWEST WILL SHEAR APART...WITH THE MID LEVEL TROUGH MOVING TO
THE WEST SOUTHWEST AND AWAY FROM OUR AREA...WHILE THE WEAKENING
UPPER LEVEL TROUGH DRIFTS SLOWLY TO THE EAST NORTHEAST. A DEEP DRY
LAYER WILL PERSIST ACROSS THE STATE IN THE MID LEVELS...WITH A MID
LEVEL RIDGE BUILDING JUST TO OUR NORTH. THEREFORE WOULD EXPECT
THE ONLY IMPACT TO OUR SENSIBLE WEATHER FROM THE UPPER TROUGH TO
BE PERIODS OF HIGH LEVEL CLOUDINESS. ACTIVE TRADE SHOWERS WILL
CONTINUE ACROSS WINDWARD/MAUKA...WITH SOME SPILLOVER TO LEEWARD
DUE TO THE STRENGTH OF THE TRADES.

TRADES SHOULD RETURN TO MORE MODERATE LEVELS TUESDAY THROUGH
THURSDAY...AS THE FIRST SURFACE HIGH SHIFTS FURTHER TO THE
NORTHEAST AND IS REPLACED BY A SECOND SLIGHTLY WEAKER HIGH TO OUR
NORTH. WOULD EXPECT LITTLE CHANGE IN THE WEATHER PATTERN ACROSS
HAWAII WITH SHOWERS CONTINUING MAINLY ACROSS WINDWARD SECTIONS.

&&

.AVIATION...
A TRADE WIND FLOW CONTINUES WITH EMBEDDED SHOWERS FAVORING THE
WINDWARD AND MTN AREAS. BUT IT APPEARS THIS FLOW HAS BECOME DRIER AS
THE NIGHT PROGRESSES. FIRST IS THE MARINE LAYER WHICH HAS LOWERED
FROM 10K EARLY IN THE EVENING TO THE CURRENT...BETWEEN 6 AND 7K
FEET. SECOND...RADAR RETURNS ARE NOT AS ACTIVE AS AT THE START OF
THE EVENING. THE SHOWERS HAVE TURNED LIGHTER TO PERHAPS MORE OF A
DRIZZLE. THIRD...SFC OBS FROM AROUND THE STATE SUGGEST THE LO CLD
COVER ESPECIALLY FROM THE WINDWARD STATIONS...HAS BECOME LESS.
CLOUD BASES THOUGH REMAINS AS LOW AS 2K FEET. MODELS SUGGESTS THIS
DRIER AIR MASS TO PERSISTS THROUGH ALL OF TODAY. HENCE...VFR
CONDITION RULES. ANY MVFR DUE TO CEILINGS AND VIS WILL BE BRIEF
AND ISOLATED AND FAVORING THE WINDWARD AND MTN AREAS.

LITTLE CHANGE TO THE STRENGTH OF THE TRADE WINDS WHICH WILL BE IN
THE MODERATE TO STRONG RANGE. GIVEN A DECENT INVERSION...AIRMET
TANGO FOR MOD MECHANICAL TURB WILL CONT TO WELL BEYOND 04Z SUNDAY.

&&

.MARINE...
AN 0830Z ASCAT PASS ONLY CAUGHT THE WESTERN EDGE OF THE COASTAL
WATERS...BUT DID SHOW SIGNIFICANT COVERAGE OF 23-25 KT WINDS WEST
AND SOUTH OF KAUAI. THESE WINDS ARE SEVERAL KNOTS ABOVE GUIDANCE...
BUT THIS DATA COMBINED WITH AVAILABLE LAND STATION OBS SUPPORT
EXPANDING THE SMALL CRAFT ADVISORY TO COVER ALL HAWAIIAN COASTAL
WATERS. WINDS SHOULD ONLY INCREASE FURTHER WITH TIME AS HIGH
PRESSURE BUILDS TO OUR NORTH...AND HAVE ALSO EXTENDED THE SCA
IN TIME OUT THROUGH MONDAY. WINDS MAY REACH NEAR GALE FORCE AT
TIMES SUNDAY THROUGH MONDAY IN THE ALENUIHAHA CHANNEL.

ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO ARRIVE LATER TODAY
AND LINGER THROUGH SUNDAY...BUT THE RESULTING SURF WILL REMAIN
WELL BELOW ADVISORY LEVELS FOR NORTH AND WEST FACING SHORES. TRADE
WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY SURF ALONG EAST
FACING SHORES...AND HIGH SURF ADVISORIES WILL PROBABLY BE NEEDED
BY SUNDAY AS THE FETCH LENGTH INCREASES DUE TO THE BUILDING HIGH
TO OUR NORTH.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR ALL HAWAIIAN
WATERS.

&&

$$

DISCUSSION/MARINE...JACOBSON
AVIATION...LAU







000
FXHW60 PHFO 191340
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
340 AM HST SAT APR 19 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN WILL CONTINUE THROUGH THE NEXT
SEVERAL DAYS ACROSS HAWAII...THANKS TO HIGH PRESSURE NORTH OF THE
STATE. SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW
SHOWERS POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
SHOWERS HAVE BECOME RATHER SPARSE OVER THE STATE DURING THE PAST
SEVERAL HOURS...WITH RADAR AND RAIN GAUGE DATA SHOWING ONLY VERY
LIGHT RAINFALL AMOUNTS ACROSS SOME WINDWARD AREAS. THE 12Z
SOUNDINGS SHOW A LOWERING OF THE INVERSION AS EXPECTED...WITH THE
BASE DOWN TO BETWEEN 5700 AND 6700 FEET...FROM ABOUT 9000 FEET 12
HOURS EARLIER. THIS IS CONSISTENT WITH MIMIC-TPW SATELLITE DATA
WHICH INDICATE A DRIER AIRMASS SPREADING INTO THE STATE FROM THE
EAST. EARLIER MODEL DATA SUGGESTED THAT THIS DRYING WOULD TAKE
PLACE PRIMARILY IN THE 850-700 MB LAYER...AGAIN CONSISTENT WITH
THE 12Z RAOB DATA. SATELLITE IMAGERY DEPICTS ABUNDANT HIGH
LEVEL CLOUDINESS STREAMING NORTHWARD ACROSS THE STATE...TO THE
EAST OF A MID/UPPER LEVEL TROUGH CENTERED SEVERAL HUNDRED MILES
TO THE SOUTHWEST. AT THE SURFACE...A 1023 MB HIGH IS CENTERED WELL
NORTHEAST OF THE STATE...WITH A STRONGER 1028 MB HIGH BUILDING
EASTWARD FROM THE DATELINE NORTH OF 30N.

FOR TODAY...EXPECT SHOWER COVERAGE TO REMAIN FAIRLY SPARSE WITH
LIGHT RAINFALL AMOUNTS EVEN ACROSS WINDWARD SECTIONS...AS STABLE
AND DRY CONDITIONS CONTINUE. TONIGHT...SATELLITE AND MODEL DATA
INDICATE THAT ANOTHER AREA OF HIGHER MOISTURE WILL BE MOVING INTO
THE STATE...ALTHOUGH MODEL SOUNDINGS SHOW THE INVERSION REMAINING
FAIRLY LOW. WITH BRISK TRADES IN PLACE...THE INFLUX OF ADDITIONAL
LOW LEVEL MOISTURE SHOULD BE SUFFICIENT TO INCREASE SHOWER
ACTIVITY ONCE AGAIN ACROSS WINDWARD/MAUKA AREAS...WITH SOME
SPILLOVER INTO LEEWARD.

SUNDAY THROUGH MONDAY NIGHT...RATHER STRONG HIGH PRESSURE WILL
PASS NORTH OF THE STATE...CAUSING TRADES TO INCREASE FURTHER.
ALOFT...GUIDANCE INDICATES THAT THE MID/UPPER TROUGH TO OUR
SOUTHWEST WILL SHEAR APART...WITH THE MID LEVEL TROUGH MOVING TO
THE WEST SOUTHWEST AND AWAY FROM OUR AREA...WHILE THE WEAKENING
UPPER LEVEL TROUGH DRIFTS SLOWLY TO THE EAST NORTHEAST. A DEEP DRY
LAYER WILL PERSIST ACROSS THE STATE IN THE MID LEVELS...WITH A MID
LEVEL RIDGE BUILDING JUST TO OUR NORTH. THEREFORE WOULD EXPECT
THE ONLY IMPACT TO OUR SENSIBLE WEATHER FROM THE UPPER TROUGH TO
BE PERIODS OF HIGH LEVEL CLOUDINESS. ACTIVE TRADE SHOWERS WILL
CONTINUE ACROSS WINDWARD/MAUKA...WITH SOME SPILLOVER TO LEEWARD
DUE TO THE STRENGTH OF THE TRADES.

TRADES SHOULD RETURN TO MORE MODERATE LEVELS TUESDAY THROUGH
THURSDAY...AS THE FIRST SURFACE HIGH SHIFTS FURTHER TO THE
NORTHEAST AND IS REPLACED BY A SECOND SLIGHTLY WEAKER HIGH TO OUR
NORTH. WOULD EXPECT LITTLE CHANGE IN THE WEATHER PATTERN ACROSS
HAWAII WITH SHOWERS CONTINUING MAINLY ACROSS WINDWARD SECTIONS.

&&

.AVIATION...
A TRADE WIND FLOW CONTINUES WITH EMBEDDED SHOWERS FAVORING THE
WINDWARD AND MTN AREAS. BUT IT APPEARS THIS FLOW HAS BECOME DRIER AS
THE NIGHT PROGRESSES. FIRST IS THE MARINE LAYER WHICH HAS LOWERED
FROM 10K EARLY IN THE EVENING TO THE CURRENT...BETWEEN 6 AND 7K
FEET. SECOND...RADAR RETURNS ARE NOT AS ACTIVE AS AT THE START OF
THE EVENING. THE SHOWERS HAVE TURNED LIGHTER TO PERHAPS MORE OF A
DRIZZLE. THIRD...SFC OBS FROM AROUND THE STATE SUGGEST THE LO CLD
COVER ESPECIALLY FROM THE WINDWARD STATIONS...HAS BECOME LESS.
CLOUD BASES THOUGH REMAINS AS LOW AS 2K FEET. MODELS SUGGESTS THIS
DRIER AIR MASS TO PERSISTS THROUGH ALL OF TODAY. HENCE...VFR
CONDITION RULES. ANY MVFR DUE TO CEILINGS AND VIS WILL BE BRIEF
AND ISOLATED AND FAVORING THE WINDWARD AND MTN AREAS.

LITTLE CHANGE TO THE STRENGTH OF THE TRADE WINDS WHICH WILL BE IN
THE MODERATE TO STRONG RANGE. GIVEN A DECENT INVERSION...AIRMET
TANGO FOR MOD MECHANICAL TURB WILL CONT TO WELL BEYOND 04Z SUNDAY.

&&

.MARINE...
AN 0830Z ASCAT PASS ONLY CAUGHT THE WESTERN EDGE OF THE COASTAL
WATERS...BUT DID SHOW SIGNIFICANT COVERAGE OF 23-25 KT WINDS WEST
AND SOUTH OF KAUAI. THESE WINDS ARE SEVERAL KNOTS ABOVE GUIDANCE...
BUT THIS DATA COMBINED WITH AVAILABLE LAND STATION OBS SUPPORT
EXPANDING THE SMALL CRAFT ADVISORY TO COVER ALL HAWAIIAN COASTAL
WATERS. WINDS SHOULD ONLY INCREASE FURTHER WITH TIME AS HIGH
PRESSURE BUILDS TO OUR NORTH...AND HAVE ALSO EXTENDED THE SCA
IN TIME OUT THROUGH MONDAY. WINDS MAY REACH NEAR GALE FORCE AT
TIMES SUNDAY THROUGH MONDAY IN THE ALENUIHAHA CHANNEL.

ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO ARRIVE LATER TODAY
AND LINGER THROUGH SUNDAY...BUT THE RESULTING SURF WILL REMAIN
WELL BELOW ADVISORY LEVELS FOR NORTH AND WEST FACING SHORES. TRADE
WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY SURF ALONG EAST
FACING SHORES...AND HIGH SURF ADVISORIES WILL PROBABLY BE NEEDED
BY SUNDAY AS THE FETCH LENGTH INCREASES DUE TO THE BUILDING HIGH
TO OUR NORTH.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST MONDAY FOR ALL HAWAIIAN
WATERS.

&&

$$

DISCUSSION/MARINE...JACOBSON
AVIATION...LAU








000
ATHW40 PHFO 191230
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC SAT APR 19 2014

BASED ON DATA THROUGH 1200 UTC APRIL 19 2014

WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL LOW CENTERED AT 17N166W
MOVING TO THE WEST VERY SLOWLY. INFRARED SATELLITE SHOWS AN
OVERCAST MIX OF LAYERED AND CIRRUS CLOUDS ALONG THE EASTERN FLANK OF
THE LOW. SOUTHERLY WINDS IN THIS AREAS ARE DRAWING MOISTURE NORTH
FROM THE NEAR-EQUATORIAL TRADE WIND CONVERGENCE ZONES /NETWCZ/. THE
CLOUD AREA COVERS FROM 10N TO THE MAIN HAWAIIAN ISLANDS...GENERALLY
BOUNDED EAST TO WEST BY 152W AND 165W.

STREAKS OF BROKEN CIRRUS WERE ALSO NOTED FAR NORTHWEST OF THE
STATE WITHIN AN AREA BOUNDED BETWEEN 30N151W TO 25N160W TO 27N164W
TO 30N160W. THESE HIGH CLOUDS ARE TRAVELING EAST AT 25 MPH.

TRADE WINDS ARE MOVING BROKEN STRATOCUMULUS CLOUDS TO THE WEST AT 25
MPH. THESE CLOUDS ARE BOUNDED BETWEEN 10N AND 26N...AND ARE BUSHING
OVER AND TO THE SOUTH OF THE MAIN HAWAIIAN ISLANDS. RADAR INDICATES
THESE CLOUDS ARE PRODUCING WIDELY SCATTERED SHOWERS OVER WINDWARD
AND MAUKA AREAS OF THE ISLANDS...WITH ISOLATED PASSING SHOWERS ONTO
LEEWARD SIDES OF THE SMALLER ISLANDS. THE STRATOCUMULUS CLOUD AREA
SHRINKS TO A 175 MILE WIDE BAND WHICH GOES FROM THE MAIN HAWAIIAN
ISLANDS TO 17N180E.

WHILE MUCH OF THE MAIN HAWAIIAN ISLAND CHAIN IS OBSCURED BY THE
HIGHER CLOUDS...INFRARED IMAGES SHOW BROKEN TO OVERCAST CLOUDS
OVER THE WINDWARD AND MAUKA AREAS...WITH SCATTERED TO FEW LOW CLOUDS
ACROSS THE LEEWARD SIDES OF THE ISLANDS.

ALONG THE NORTHWEST CORNER OF THE BASIN IS A STATIONARY FRONT IS
LOCATED ALONG A LINE FROM 30N163W TO 29N180E. THE FRONT IS
CHARACTERIZED BY A 125 MILE WIDE BAND OF OVERCAST CUMULUS CLOUDS.

THE NETWCZ CONSISTS OF SCATTERED THUNDERSTORMS ALONG AN AXIS FROM
03N140W TO 08N163W TO 04N180E. THE NETWCZ IS AROUND 400 TO 600 MILES
WIDE. HIGHEST CLOUD TOPS IN THIS AREA ARE UP TO 50 KFT IN HEIGHT.

$$

FOSTER





000
ATHW40 PHFO 191230
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC SAT APR 19 2014

BASED ON DATA THROUGH 1200 UTC APRIL 19 2014

WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL LOW CENTERED AT 17N166W
MOVING TO THE WEST VERY SLOWLY. INFRARED SATELLITE SHOWS AN
OVERCAST MIX OF LAYERED AND CIRRUS CLOUDS ALONG THE EASTERN FLANK OF
THE LOW. SOUTHERLY WINDS IN THIS AREAS ARE DRAWING MOISTURE NORTH
FROM THE NEAR-EQUATORIAL TRADE WIND CONVERGENCE ZONES /NETWCZ/. THE
CLOUD AREA COVERS FROM 10N TO THE MAIN HAWAIIAN ISLANDS...GENERALLY
BOUNDED EAST TO WEST BY 152W AND 165W.

STREAKS OF BROKEN CIRRUS WERE ALSO NOTED FAR NORTHWEST OF THE
STATE WITHIN AN AREA BOUNDED BETWEEN 30N151W TO 25N160W TO 27N164W
TO 30N160W. THESE HIGH CLOUDS ARE TRAVELING EAST AT 25 MPH.

TRADE WINDS ARE MOVING BROKEN STRATOCUMULUS CLOUDS TO THE WEST AT 25
MPH. THESE CLOUDS ARE BOUNDED BETWEEN 10N AND 26N...AND ARE BUSHING
OVER AND TO THE SOUTH OF THE MAIN HAWAIIAN ISLANDS. RADAR INDICATES
THESE CLOUDS ARE PRODUCING WIDELY SCATTERED SHOWERS OVER WINDWARD
AND MAUKA AREAS OF THE ISLANDS...WITH ISOLATED PASSING SHOWERS ONTO
LEEWARD SIDES OF THE SMALLER ISLANDS. THE STRATOCUMULUS CLOUD AREA
SHRINKS TO A 175 MILE WIDE BAND WHICH GOES FROM THE MAIN HAWAIIAN
ISLANDS TO 17N180E.

WHILE MUCH OF THE MAIN HAWAIIAN ISLAND CHAIN IS OBSCURED BY THE
HIGHER CLOUDS...INFRARED IMAGES SHOW BROKEN TO OVERCAST CLOUDS
OVER THE WINDWARD AND MAUKA AREAS...WITH SCATTERED TO FEW LOW CLOUDS
ACROSS THE LEEWARD SIDES OF THE ISLANDS.

ALONG THE NORTHWEST CORNER OF THE BASIN IS A STATIONARY FRONT IS
LOCATED ALONG A LINE FROM 30N163W TO 29N180E. THE FRONT IS
CHARACTERIZED BY A 125 MILE WIDE BAND OF OVERCAST CUMULUS CLOUDS.

THE NETWCZ CONSISTS OF SCATTERED THUNDERSTORMS ALONG AN AXIS FROM
03N140W TO 08N163W TO 04N180E. THE NETWCZ IS AROUND 400 TO 600 MILES
WIDE. HIGHEST CLOUD TOPS IN THIS AREA ARE UP TO 50 KFT IN HEIGHT.

$$

FOSTER






000
FXHW60 PHFO 190630
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN WILL CONTINUE THROUGH THE NEXT
SEVERAL DAYS ACROSS HAWAII...THANKS TO HIGH PRESSURE NORTH OF THE
STATE. CLOUDS AND PASSING SHOWERS WILL FAVOR WINDWARD AND MAUKA
AREAS WITH A FEW SHOWERS POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
RADAR AND RAIN GAUGE DATA INDICATE THAT SHOWER ACTIVITY HAS
REMAINED FOCUSED PRIMARILY ACROSS THE TYPICALLY WETTER WINDWARD
AND MAUKA AREAS DURING THE PAST SEVERAL HOURS...BUT LIGHT RAINFALL
AMOUNTS HAVE OCCURRED AT SOME LEEWARD SPOTS. THE 00Z SOUNDINGS
SHOW A RATHER HIGH INVERSION BASED NEAR 9000 FEET. THE DEEPER
MOIST LAYER BENEATH THE INVERSION ALLOWS FOR PWATS TO BE NEAR OR
ABOVE NORMAL...WITH THE LIHUE PWAT JUST ABOVE THE 75TH PERCENTILE
FOR THIS TIME OF YEAR. SATELLITE IMAGERY DEPICTS ABUNDANT HIGH
LEVEL CLOUDINESS STREAMING NORTHWARD ACROSS THE STATE...TO THE
EAST OF A MID/UPPER LEVEL TROUGH CENTERED SEVERAL HUNDRED MILES
TO THE SOUTHWEST. AT THE SURFACE...A 1024 MB HIGH IS CENTERED WELL
NORTHEAST OF THE STATE...WITH A SLIGHTLY STRONGER HIGH WELL TO OUR
NORTHWEST.

FOR THE OVERNIGHT PERIOD INTO SATURDAY MORNING...MIMIC-TPW
SATELLITE IMAGERY AND MODEL DATA SUGGEST THAT A SLIGHTLY DRIER
LOWER/MID LEVEL (850-700 MB) AIRMASS WILL SPREAD ACROSS THE STATE
FROM THE EAST. MODEL SOUNDINGS SHOW A LOWERING OF THE INVERSION
DURING THIS TIME AS WELL. THEREFORE IN THE NEAR TERM WOULD EXPECT
TRADE SHOWERS TO REMAIN SOMEWHAT ACTIVE THROUGH THE REST OF THIS
EVENING AND INTO THE OVERNIGHT...THEN BECOME MORE LIMITED IN EXTENT
WITH LIGHTER RAINFALL AMOUNTS TOWARD SUNRISE AND INTO SATURDAY.

THROUGH THE REST OF THE WEEKEND AND INTO EARLY NEXT WEEK...HIGH
PRESSURE WILL STRENGTHEN TO THE NORTH OF THE STATE...CAUSING AN
UPTICK IN THE TRADE WIND FLOW FROM SUNDAY THROUGH MONDAY. 850-700
MB LAYER MOISTURE IS FORECAST TO INCREASE ONCE AGAIN DURING THAT
TIME AS WELL. ALOFT...GUIDANCE INDICATES THAT THE MID/UPPER
TROUGH TO OUR SOUTHWEST WILL SHEAR APART...WITH THE MID LEVEL
TROUGH MOVING TO THE WEST SOUTHWEST AND AWAY FROM OUR AREA...WHILE
THE WEAKENING UPPER LEVEL TROUGH DRIFTS SLOWLY TO THE EAST
NORTHEAST. A DEEP DRY LAYER WILL PERSIST ACROSS THE STATE IN THE
MID LEVELS...WITH A MID LEVEL RIDGE BUILDING JUST TO OUR NORTH
MONDAY THROUGH TUESDAY. THEREFORE WOULD EXPECT THE ONLY IMPACT TO
OUR SENSIBLE WEATHER FROM THE UPPER TROUGH TO BE CONTINUED HIGH
LEVEL CLOUDINESS...WITH SHOWERS FAVORING WINDWARD/MAUKA AREAS.
TRADE SHOWERS MAY BE ENHANCED SOMEWHAT FROM SUNDAY THROUGH EARLY
MONDAY DUE TO THE INCREASING TRADES AND DEEPENING MOISTURE.

LITTLE CHANGE IS EXPECTED DURING THE MIDDLE OF NEXT WEEK...WITH
RIDGING AT THE SURFACE AND ALOFT REMAINING NORTH OF THE STATE AND
TRADES CONTINUING. CONTINUED WEAKENING OF THE NEARBY UPPER TROUGH
AND THE PROXIMITY OF THE MID LEVEL RIDGE MAY LOWER THE INVERSION
SOMEWHAT AND PRODUCE A SLIGHTLY DRIER PATTERN...WITH LIMITED
SHOWERS CONTINUING WINDWARD AND MAUKA.

&&

.AVIATION...
A TRADE WIND FLOW CONTINUES WITH EMBEDDED SHOWERS FAVORING THE WINDWARD
AND MTN AREAS. THUS WE WILL BE MONITORING CLOSELY FOR WIDESPREAD MTN
OBSC DUE TO THESE SHOWER BEARING CLOUDS THAT MAY WARRANT AN AIRMET
SIERRA. CLOUD BASES ARE DOWN TO AS LOW AS 1500 FEET.

A FEW OF THESE SHOWERS WILL DRIFT OVER ONTO THE LEEWARD SECTIONS OF
THE SMALLER ISLANDS BUT THEY SHOULD NOT WARRANT ANY AIRMETS.

AIRMET TANGO FOR LOW LEVEL MECHANICAL TURBULENCE WILL CONT THROUGH
AT LEAST 16Z SATURDAY.

OTHERWISE...VFR IS THE PREVAILING FLYING COND.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SUNDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS
ADVISORY WILL LIKELY NEED TO BE EXTENDED INTO EARLY NEXT WEEK AS
MODERATE TO FRESH TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE
FORESEEABLE FUTURE. IT IS POSSIBLE THAT SOME OF THE OTHER CHANNELS
MAY NEED TO BE INCLUDED IN THE ADVISORY AS WELL FROM SUNDAY
THROUGH MONDAY WHEN TRADES ARE FORECAST TO INCREASE SLIGHTLY.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER OVERNIGHT.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN DURING THE
WEEKEND...BUT THE RESULTING SURF WILL REMAIN WELL BELOW ADVISORY
LEVELS. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES...AND THERE IS SOME POTENTIAL FOR
MINIMAL ADVISORY LEVEL SURF ON THOSE SHORES BY MONDAY.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.


&&

$$

DISCUSSION/MARINE...JACOBSON
AVIATION...LAU







000
ATHW40 PHFO 190531
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC SAT APR 19 2014

BASED ON DATA THROUGH 0500 UTC APRIL 19 2014

WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL LOW CENTERED AT 16N166W
MOVING TO THE WEST VERY SLOWLY. INFRARED SATELLITE SHOWS AN
OVERCAST MIX OF LAYERED AND CIRRUS CLOUDS ALONG THE EASTERN FLANK OF
THE LOW. SOUTHERLY WINDS IN THIS AREAS ARE DRAWING MOISTURE NORTH
FROM THE NEAR-EQUATORIAL TRADE WIND CONVERGENCE ZONES /NETWCZ/. THE
CLOUD AREA COVERS FROM 10N TO THE MAIN HAWAIIAN ISLANDS...GENERALLY
BOUNDED EAST TO WEST BY 153W AND 164W.

STREAKS OF BROKEN CIRRUS WERE ALSO NOTED FAR NORTHWEST OF THE
STATE WITHIN AN AREA BOUNDED BETWEEN 30N153W TO 21N168W TO 23N173W
TO 30N164W. THESE HIGH CLOUDS ARE TRAVELING EAST AT 25 MPH.

TRADE WINDS ARE MOVING BROKEN STRATOCUMULUS CLOUDS TO THE WEST AT 25
MPH. THESE CLOUDS ARE BOUNDED BETWEEN 10N AND 26N...AND ARE BUSHING
OVER AND TO THE SOUTH OF THE MAIN HAWAIIAN ISLANDS. RADAR INDICATES
THESE CLOUDS ARE PRODUCING SCATTERED SHOWERS OVER WINDWARD AND MAUKA
AREAS OF THE ISLANDS...WITH OCCASIONAL PASSING SHOWERS ONTO LEEWARD
SIDES OF THE SMALLER ISLANDS. THE STRATOCUMULUS CLOUD AREA SHRINKS
TO A 175 MILE WIDE BAND WHICH GOES FROM THE MAIN HAWAIIAN ISLANDS TO
17N180E.

WHILE MUCH OF THE MAIN HAWAIIAN ISLAND CHAIN IS OBSCURED BY THE
HIGHER CLOUDS...LAST VISIBLE IMAGES SHOW BROKEN TO OVERCAST CLOUDS
OVER THE WINDWARD AND MAUKA AREAS...WITH SCATTERED TO FEW LOW CLOUDS
ACROSS THE LEEWARD SIDES OF THE ISLANDS.

THE NETWCZ IS CHARACTERIZED BY A BAND OF SCATTERED THUNDERSTORMS
ALONG AN AXIS FROM 02N141W TO 08N163W TO 04N180E. THE NETWCZ IS
AROUND 400 TO 600 MILES WIDE. HIGHEST CLOUD TOPS IN THIS AREA ARE UP
TO 46 KFT IN HEIGHT.

$$

FOSTER





000
ATHW40 PHFO 190531
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC SAT APR 19 2014

BASED ON DATA THROUGH 0500 UTC APRIL 19 2014

WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL LOW CENTERED AT 16N166W
MOVING TO THE WEST VERY SLOWLY. INFRARED SATELLITE SHOWS AN
OVERCAST MIX OF LAYERED AND CIRRUS CLOUDS ALONG THE EASTERN FLANK OF
THE LOW. SOUTHERLY WINDS IN THIS AREAS ARE DRAWING MOISTURE NORTH
FROM THE NEAR-EQUATORIAL TRADE WIND CONVERGENCE ZONES /NETWCZ/. THE
CLOUD AREA COVERS FROM 10N TO THE MAIN HAWAIIAN ISLANDS...GENERALLY
BOUNDED EAST TO WEST BY 153W AND 164W.

STREAKS OF BROKEN CIRRUS WERE ALSO NOTED FAR NORTHWEST OF THE
STATE WITHIN AN AREA BOUNDED BETWEEN 30N153W TO 21N168W TO 23N173W
TO 30N164W. THESE HIGH CLOUDS ARE TRAVELING EAST AT 25 MPH.

TRADE WINDS ARE MOVING BROKEN STRATOCUMULUS CLOUDS TO THE WEST AT 25
MPH. THESE CLOUDS ARE BOUNDED BETWEEN 10N AND 26N...AND ARE BUSHING
OVER AND TO THE SOUTH OF THE MAIN HAWAIIAN ISLANDS. RADAR INDICATES
THESE CLOUDS ARE PRODUCING SCATTERED SHOWERS OVER WINDWARD AND MAUKA
AREAS OF THE ISLANDS...WITH OCCASIONAL PASSING SHOWERS ONTO LEEWARD
SIDES OF THE SMALLER ISLANDS. THE STRATOCUMULUS CLOUD AREA SHRINKS
TO A 175 MILE WIDE BAND WHICH GOES FROM THE MAIN HAWAIIAN ISLANDS TO
17N180E.

WHILE MUCH OF THE MAIN HAWAIIAN ISLAND CHAIN IS OBSCURED BY THE
HIGHER CLOUDS...LAST VISIBLE IMAGES SHOW BROKEN TO OVERCAST CLOUDS
OVER THE WINDWARD AND MAUKA AREAS...WITH SCATTERED TO FEW LOW CLOUDS
ACROSS THE LEEWARD SIDES OF THE ISLANDS.

THE NETWCZ IS CHARACTERIZED BY A BAND OF SCATTERED THUNDERSTORMS
ALONG AN AXIS FROM 02N141W TO 08N163W TO 04N180E. THE NETWCZ IS
AROUND 400 TO 600 MILES WIDE. HIGHEST CLOUD TOPS IN THIS AREA ARE UP
TO 46 KFT IN HEIGHT.

$$

FOSTER






000
FXHW60 PHFO 190133
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1024 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO A 1026 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. THE 00Z SOUNDINGS
SHOW THAT THE INVERSION IS NEAR 9000 FEET. THE UPPER TROUGH IS
FORECAST TO LINGER NEAR THE AREA OVER THE NEXT SEVERAL DAYS. THUS
SHOWERS WILL CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS AND WILL BE
HIGHLY DEPENDENT ON INCOMING MOISTURE AVAILABILITY. THE UPPER TROUGH
IS EXPECTED TO WEAKEN DURING THE SECOND HALF OF THE WEEK WITH A
SLIGHTLY DRIER WINDWARD AND MAUKA SHOWER PATTERN EXPECTED.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. THIS AIRMET IS EXPECTED TO CONTINUE THROUGH AT LEAST
SATURDAY.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SUNDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER OVERNIGHT.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD





000
FXHW60 PHFO 190133
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1024 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO A 1026 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. THE 00Z SOUNDINGS
SHOW THAT THE INVERSION IS NEAR 9000 FEET. THE UPPER TROUGH IS
FORECAST TO LINGER NEAR THE AREA OVER THE NEXT SEVERAL DAYS. THUS
SHOWERS WILL CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS AND WILL BE
HIGHLY DEPENDENT ON INCOMING MOISTURE AVAILABILITY. THE UPPER TROUGH
IS EXPECTED TO WEAKEN DURING THE SECOND HALF OF THE WEEK WITH A
SLIGHTLY DRIER WINDWARD AND MAUKA SHOWER PATTERN EXPECTED.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. THIS AIRMET IS EXPECTED TO CONTINUE THROUGH AT LEAST
SATURDAY.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SUNDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER OVERNIGHT.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD





000
FXHW60 PHFO 190133
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1024 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO A 1026 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. THE 00Z SOUNDINGS
SHOW THAT THE INVERSION IS NEAR 9000 FEET. THE UPPER TROUGH IS
FORECAST TO LINGER NEAR THE AREA OVER THE NEXT SEVERAL DAYS. THUS
SHOWERS WILL CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS AND WILL BE
HIGHLY DEPENDENT ON INCOMING MOISTURE AVAILABILITY. THE UPPER TROUGH
IS EXPECTED TO WEAKEN DURING THE SECOND HALF OF THE WEEK WITH A
SLIGHTLY DRIER WINDWARD AND MAUKA SHOWER PATTERN EXPECTED.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. THIS AIRMET IS EXPECTED TO CONTINUE THROUGH AT LEAST
SATURDAY.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SUNDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER OVERNIGHT.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD





000
FXHW60 PHFO 190133
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1024 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO A 1026 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. THE 00Z SOUNDINGS
SHOW THAT THE INVERSION IS NEAR 9000 FEET. THE UPPER TROUGH IS
FORECAST TO LINGER NEAR THE AREA OVER THE NEXT SEVERAL DAYS. THUS
SHOWERS WILL CONTINUE TO FAVOR WINDWARD AND MAUKA AREAS AND WILL BE
HIGHLY DEPENDENT ON INCOMING MOISTURE AVAILABILITY. THE UPPER TROUGH
IS EXPECTED TO WEAKEN DURING THE SECOND HALF OF THE WEEK WITH A
SLIGHTLY DRIER WINDWARD AND MAUKA SHOWER PATTERN EXPECTED.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. THIS AIRMET IS EXPECTED TO CONTINUE THROUGH AT LEAST
SATURDAY.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SUNDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER OVERNIGHT.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SUNDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD





000
ATHW40 PHFO 190024
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0030 UTC SAT APR 19 2014

BASED ON DATA THROUGH 0000 UTC APRIL 19 2014

WATER VAPOR IMAGERY SHOWED AN UPPER LOW FORMING NEAR 17N 165W.  AN
UPPER LEVEL TROUGH EXTENDED SOUTH FROM THE LOW TO 14N 165W THEN
SOUTHWEST TO NEAR 11N 170W.  THE TROUGH AND LOW WERE NEARLY
STATIONARY.

THE SOUTHERLY WINDS ON THE EAST SIDE OF THE TROUGH AND LOW WERE
DRAWING CIRRUS CLOUDS UP FROM THE DEEPER TROPICS AND SPREADING THEM
OVER ONTO THE ISLANDS.  THESE HIGH CLOUDS WERE FLOWING NORTH TO THE
ISLANDS BEFORE VEERING EASTWARD.  BROKEN CIRRUS CLOUDS WERE COMMON
FROM 10N TO 18N BETWEEN 156W AND 164W.  SCATTERED TO BROKEN CIRRUS
OCCUPIED THE AREA FROM 18N TO 22N BETWEEN 163W AND 140W.

LARGE STREAKS OF BROKEN CIRRUS WERE ALSO NOTED FAR NORTHWEST OF THE
STATE WITHIN AN AREA BOUNDED BY POINTS 23N 175W...27N 176W...35N
150W AND 32N 150W.  THE CIRRUS IN THIS AREA WAS STREAMING TOWARD THE
EAST NORTHEAST.

MEANWHILE...PERSISTENT TRADE WINDS CONTINUED TO SWEEP RANDOM PATCHES
AND CLUSTERS OF LOW CLOUDS WESTWARD INTO THE HAWAIIAN ISLANDS.  NEAR
THE STATE...THE LOW CLOUDS WERE MOVING WEST AT 20 TO  25 MILES AN
HOUR.

AT 2 PM...THERE APPEARED TO BE AN EVEN MIX OF MOSTLY SUNNY AND
MOSTLY CLOUDY SKIES OVER EACH ISLAND WITHIN THE CHAIN.  THE
CLOUDIEST AREA WAS ALONG THE KONA AND KAU SLOPES ON THE LEE SIDE OF
THE BIG ISLAND.

$$






000
ATHW40 PHFO 190024
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0030 UTC SAT APR 19 2014

BASED ON DATA THROUGH 0000 UTC APRIL 19 2014

WATER VAPOR IMAGERY SHOWED AN UPPER LOW FORMING NEAR 17N 165W.  AN
UPPER LEVEL TROUGH EXTENDED SOUTH FROM THE LOW TO 14N 165W THEN
SOUTHWEST TO NEAR 11N 170W.  THE TROUGH AND LOW WERE NEARLY
STATIONARY.

THE SOUTHERLY WINDS ON THE EAST SIDE OF THE TROUGH AND LOW WERE
DRAWING CIRRUS CLOUDS UP FROM THE DEEPER TROPICS AND SPREADING THEM
OVER ONTO THE ISLANDS.  THESE HIGH CLOUDS WERE FLOWING NORTH TO THE
ISLANDS BEFORE VEERING EASTWARD.  BROKEN CIRRUS CLOUDS WERE COMMON
FROM 10N TO 18N BETWEEN 156W AND 164W.  SCATTERED TO BROKEN CIRRUS
OCCUPIED THE AREA FROM 18N TO 22N BETWEEN 163W AND 140W.

LARGE STREAKS OF BROKEN CIRRUS WERE ALSO NOTED FAR NORTHWEST OF THE
STATE WITHIN AN AREA BOUNDED BY POINTS 23N 175W...27N 176W...35N
150W AND 32N 150W.  THE CIRRUS IN THIS AREA WAS STREAMING TOWARD THE
EAST NORTHEAST.

MEANWHILE...PERSISTENT TRADE WINDS CONTINUED TO SWEEP RANDOM PATCHES
AND CLUSTERS OF LOW CLOUDS WESTWARD INTO THE HAWAIIAN ISLANDS.  NEAR
THE STATE...THE LOW CLOUDS WERE MOVING WEST AT 20 TO  25 MILES AN
HOUR.

AT 2 PM...THERE APPEARED TO BE AN EVEN MIX OF MOSTLY SUNNY AND
MOSTLY CLOUDY SKIES OVER EACH ISLAND WITHIN THE CHAIN.  THE
CLOUDIEST AREA WAS ALONG THE KONA AND KAU SLOPES ON THE LEE SIDE OF
THE BIG ISLAND.

$$







000
FXHW60 PHFO 182008
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1025 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO ANOTHER 1025 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. A FEW WINDWARD AND
MAUKA GAUGES HAVE RECEIVED OVER AN INCH OF RAIN OVER THE PAST 12
HOURS. THE UPPER TROUGH IS FORECAST TO LINGER NEAR THE AREA OVER
THE NEXT SEVERAL DAYS. THUS SHOWERS WILL CONTINUE TO FAVOR WINDWARD
AND MAUKA AREAS AND WILL BE HIGHLY DEPENDENT ON INCOMING MOISTURE
AVAILABILITY.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. UPPER LEVEL WINDS OVER THE ISLANDS ARE SUFFICIENT ENOUGH TO
CONTINUE AN UPPER LEVEL TURBULENCE AIRMET AS WELL.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SATURDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER TODAY.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD





000
FXHW60 PHFO 182008
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST FRI APR 18 2014

.SYNOPSIS...
A TRADE WIND WEATHER PATTERN IS EXPECTED OVER THE NEXT SEVERAL DAYS
THANKS TO HIGH PRESSURE NORTH OF THE STATE. CLOUDS AND PASSING
SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS
POSSIBLE OVER SOME LEEWARD LOCATIONS.

&&

.DISCUSSION...
A 1025 MB SURFACE HIGH IS CENTERED FAR TO THE NORTHEAST OF THE STATE
WITH A RIDGE EXTENDING WESTWARD TO ANOTHER 1025 MB HIGH FAR TO THE
NORTHWEST OF THE STATE. THIS PLACES THE ISLANDS IN A MODERATE TRADE
WIND ENVIRONMENT. THE HIGH TO THE NORTHEAST IS EXPECTED TO WEAKEN
WHILE THE HIGH TO THE NORTHWEST STRENGTHENS A BIT AND MOVES EASTWARD
OVER THE WEEKEND AND ON INTO EARLY NEXT WEEK. AS THE HIGH
STRENGTHENS TO OUR NORTH...WE EXPECT A SLIGHT UPTICK IN TRADE WINDS
SPEEDS DURING THE SUNDAY AND MONDAY TIME PERIOD. THE HIGH WILL
CONTINUE MOVING EASTWARD TO A POSITION FAR TO OUR NORTHEAST BY THE
MIDDLE OF NEXT WEEK AND WEAKEN A BIT AS WELL. THUS TRADE WINDS WILL
LIKELY DROP BACK DOWN TO PRESENT LEVELS.

MOISTURE EMBEDDED IN THE TRADES IS PROVIDING FOR PASSING SHOWERS FOR
WINDWARD AND MAUKA AREAS WITH A FEW SHOWERS SPREADING OVER TO SELECT
LEEWARD AREAS AT TIMES. AN UPPER TROUGH SEEN ON SATELLITE IMAGERY
JUST TO THE SOUTHWEST OF THE STATE HAS RAISED INVERSION LEVELS A BIT
ALLOWING FOR SLIGHTLY HIGHER CLOUD DEVELOPMENT. A FEW WINDWARD AND
MAUKA GAUGES HAVE RECEIVED OVER AN INCH OF RAIN OVER THE PAST 12
HOURS. THE UPPER TROUGH IS FORECAST TO LINGER NEAR THE AREA OVER
THE NEXT SEVERAL DAYS. THUS SHOWERS WILL CONTINUE TO FAVOR WINDWARD
AND MAUKA AREAS AND WILL BE HIGHLY DEPENDENT ON INCOMING MOISTURE
AVAILABILITY.

&&

.AVIATION...
AIRMET TANGO CONTINUES FOR LOW LEVEL TURBULENCE TO THE LEE OF THE
ISLANDS. UPPER LEVEL WINDS OVER THE ISLANDS ARE SUFFICIENT ENOUGH TO
CONTINUE AN UPPER LEVEL TURBULENCE AIRMET AS WELL.

CLOUDS AND SHOWERS ARE FOCUSED OVER WINDWARD AND MAUKA AREAS...WHICH
AT TIMES WILL BRING MVFR CONDITIONS TO THOSE AREAS. OTHERWISE...VFR
CONDITIONS ARE EXPECTED...WITH PASSING HIGH CLOUDS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS POSTED THROUGH SATURDAY AFTERNOON FOR
THE TYPICALLY WINDY WATERS AROUND MAUI AND THE BIG ISLAND. THIS WILL
LIKELY HAVE TO BE EXTENDED INTO EARLY NEXT WEEK AS MODERATE TO FRESH
TRADE WINDS ARE EXPECTED TO CONTINUE INTO THE FORESEEABLE FUTURE.

THE CURRENT SMALL NORTHWEST SWELL WILL CONTINUE TO LOWER TODAY.
ANOTHER SMALL NORTHWEST SWELL IS EXPECTED TO FILL IN OVER THE
WEEKEND. TRADE WINDS WILL CONTINUE TO PRODUCE SHORT PERIOD CHOPPY
SURF ALONG EAST FACING SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

SYNOPSIS/DISCUSSION/MARINE...BURKE
AVIATION...M BALLARD






000
FXHW60 PHFO 181354
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 AM HST FRI APR 18 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO THE NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL SEE MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
QUITE A BIT OF SHOWERS AFFECTING THE WINDWARD AREAS OF THE ISLANDS
EARLY THIS MORNING...AS REVEALED BY RADAR DATA. LATEST RAINFALL
REPORT INDICATED MEASURABLE AMOUNTS ON THE WINDWARD GAGES...THOUGH
THE NUMBERS ARE NOWHERE HIGH ENOUGH TO BE A CONCERN. THESE SHOWERS
ARE MOVING RATHER QUICKLY UNDER THE MODERATE TRADE WINDS...THUS
LIMITING THE ACCUMULATIONS. EARLY MORNING SOUNDINGS FROM LIHUE AND
HILO INDICATE LOW LEVEL MOISTURE IS NOW EXTENDING TO 8 TO 9 THOUSAND
FEET...WHILE THE AIR MASS REMAINS SLIGHTLY UNSTABLE. THEREFORE
ATMOSPHERIC CONDITIONS REMAIN FAVORABLE FOR WETTING RAIN TO DEVELOP.
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS WILL
MAINTAIN TRADE WINDS TO THE STATE TODAY. THE SURFACE PRESSURE
GRADIENT ACROSS THE AREA WILL REMAIN HIGH ENOUGH TO SUPPORT MODERATE
TO LOCALLY STRONG TRADE WINDS OVER THE ISLANDS. A SLOW-MOVING UPPER
LEVEL TROUGH CONTINUES IN THE ISLAND VICINITY. THIS TROUGH IS
DRAWING HIGH CLOUDS FROM THE CONVECTION FAR SOUTHEAST OF THE STATE.
AND THESE HIGH CLOUDS ARE KEEPING SKIES A LITTLE MORE CLOUDY OVER
THE STATE. THE PRESENT OF THIS UPPER LEVEL TROUGH IS ALSO THE REASON
WHY THE AIR MASS REMAINS SLIGHT UNSTABLE IN THE ISLAND VICINITY.

NOT MUCH CHANGES ARE EXPECTED IN THE OVERALL WEATHER PATTERN IN THE
COMING DAYS. THEREFORE TRADE WIND WEATHER WILL PREVAIL OVER THE
ISLANDS THROUGH THE WEEKEND INTO NEXT WEEK. PASSING LOW CLOUDS AND
SHOWERS WILL AFFECT MAINLY WINDWARD AND MOUNTAIN AREAS...THOUGH
WINDS ARE STRONG ENOUGH TO BRING SOME SHOWERS TO THE LEE AREAS OF
THE SMALLER ISLANDS. LATEST MODEL GUIDANCE STILL INDICATES A
STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE NORTHWEST OF THE
ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY NEXT WEEK. THIS
MAY RESULT A SLIGHT BOOST OF TRADE WINDS ACROSS THE STATE SUNDAY AND
MONDAY. THE UPPER LEVEL TROUGH MAY ALSO PERSIST IN THE ISLAND
VICINITY THROUGH EARLY NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE
ISLAND VICINITY SLIGHTLY UNSTABLE...WHICH IS FAVORABLE FOR SHOWERS
TO DEVELOP.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH IN THE ISLAND VICINITY TO
WARRANT THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE
TODAY.

AN AIRMET REMAINS IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER LEVEL TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG
WIND SHEAR AT THE UPPER LEVELS. MODEL GUIDANCE INDICATES THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA ALOFT MAY DIMINISH
LATER TODAY.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. THEREFORE CONDITIONS WILL BE
PREDOMINATELY VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES
IN SHOWERS AFFECTING MAINLY WINDWARD AND MOUNTAIN AREAS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO LOCALLY FRESH TRADE WINDS PERSIST.

THE CURRENT SLIGHT NORTHWEST SWELL IS ON THE DECLINE EARLY THIS
MORNING FOR THE WESTERN ISLANDS. A NEW SMALL NORTHWEST SWELL IS
EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL REMAIN ELEVATED
SOMEWHAT DUE TO THE MODERATE TO FRESH TRADE WINDS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI





000
FXHW60 PHFO 181354
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 AM HST FRI APR 18 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO THE NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL SEE MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
QUITE A BIT OF SHOWERS AFFECTING THE WINDWARD AREAS OF THE ISLANDS
EARLY THIS MORNING...AS REVEALED BY RADAR DATA. LATEST RAINFALL
REPORT INDICATED MEASURABLE AMOUNTS ON THE WINDWARD GAGES...THOUGH
THE NUMBERS ARE NOWHERE HIGH ENOUGH TO BE A CONCERN. THESE SHOWERS
ARE MOVING RATHER QUICKLY UNDER THE MODERATE TRADE WINDS...THUS
LIMITING THE ACCUMULATIONS. EARLY MORNING SOUNDINGS FROM LIHUE AND
HILO INDICATE LOW LEVEL MOISTURE IS NOW EXTENDING TO 8 TO 9 THOUSAND
FEET...WHILE THE AIR MASS REMAINS SLIGHTLY UNSTABLE. THEREFORE
ATMOSPHERIC CONDITIONS REMAIN FAVORABLE FOR WETTING RAIN TO DEVELOP.
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS WILL
MAINTAIN TRADE WINDS TO THE STATE TODAY. THE SURFACE PRESSURE
GRADIENT ACROSS THE AREA WILL REMAIN HIGH ENOUGH TO SUPPORT MODERATE
TO LOCALLY STRONG TRADE WINDS OVER THE ISLANDS. A SLOW-MOVING UPPER
LEVEL TROUGH CONTINUES IN THE ISLAND VICINITY. THIS TROUGH IS
DRAWING HIGH CLOUDS FROM THE CONVECTION FAR SOUTHEAST OF THE STATE.
AND THESE HIGH CLOUDS ARE KEEPING SKIES A LITTLE MORE CLOUDY OVER
THE STATE. THE PRESENT OF THIS UPPER LEVEL TROUGH IS ALSO THE REASON
WHY THE AIR MASS REMAINS SLIGHT UNSTABLE IN THE ISLAND VICINITY.

NOT MUCH CHANGES ARE EXPECTED IN THE OVERALL WEATHER PATTERN IN THE
COMING DAYS. THEREFORE TRADE WIND WEATHER WILL PREVAIL OVER THE
ISLANDS THROUGH THE WEEKEND INTO NEXT WEEK. PASSING LOW CLOUDS AND
SHOWERS WILL AFFECT MAINLY WINDWARD AND MOUNTAIN AREAS...THOUGH
WINDS ARE STRONG ENOUGH TO BRING SOME SHOWERS TO THE LEE AREAS OF
THE SMALLER ISLANDS. LATEST MODEL GUIDANCE STILL INDICATES A
STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE NORTHWEST OF THE
ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY NEXT WEEK. THIS
MAY RESULT A SLIGHT BOOST OF TRADE WINDS ACROSS THE STATE SUNDAY AND
MONDAY. THE UPPER LEVEL TROUGH MAY ALSO PERSIST IN THE ISLAND
VICINITY THROUGH EARLY NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE
ISLAND VICINITY SLIGHTLY UNSTABLE...WHICH IS FAVORABLE FOR SHOWERS
TO DEVELOP.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH IN THE ISLAND VICINITY TO
WARRANT THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE
TODAY.

AN AIRMET REMAINS IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER LEVEL TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG
WIND SHEAR AT THE UPPER LEVELS. MODEL GUIDANCE INDICATES THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA ALOFT MAY DIMINISH
LATER TODAY.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. THEREFORE CONDITIONS WILL BE
PREDOMINATELY VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES
IN SHOWERS AFFECTING MAINLY WINDWARD AND MOUNTAIN AREAS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO LOCALLY FRESH TRADE WINDS PERSIST.

THE CURRENT SLIGHT NORTHWEST SWELL IS ON THE DECLINE EARLY THIS
MORNING FOR THE WESTERN ISLANDS. A NEW SMALL NORTHWEST SWELL IS
EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL REMAIN ELEVATED
SOMEWHAT DUE TO THE MODERATE TO FRESH TRADE WINDS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI






000
FXHW60 PHFO 180829 CCA
AFDHFO

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL SEE MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI






000
FXHW60 PHFO 180829 CCA
AFDHFO

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL SEE MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI






000
FXHW60 PHFO 180829 CCA
AFDHFO

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL SEE MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI






000
FXHW60 PHFO 180829 CCA
AFDHFO

AREA FORECAST DISCUSSION...CORRECTED
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL SEE MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI






000
FXHW60 PHFO 180638
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI





000
FXHW60 PHFO 180638
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI





000
FXHW60 PHFO 180638
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI





000
FXHW60 PHFO 180638
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
830 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH NEXT WEEK AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS...WHILE
LEEWARD BIG ISLAND WILL MORE CLOUDS AND SHOWERS DURING THE
AFTERNOON AND EVENING HOURS.

&&

.DISCUSSION...
AREA OF SURFACE HIGH PRESSURE PREVAILING NORTH OF THE ISLANDS AND
WILL MAINTAIN TRADE WINDS TO THE STATE. THE PRESSURE GRADIENT
BETWEEN THIS HIGH PRESSURE AREA AND EQUATORIAL LOW PRESSURE WILL
REMAIN HIGH ENOUGH TO SUPPORT MODERATE TO LOCALLY STRONG TRADE
WINDS OVER THE AREA THROUGH THE WEEKEND. LATEST SATELLITE IMAGERY
AS WELL AS RADAR DATA REVEALED AN AREA OF LOW CLOUDS PASSING MAINLY
OVER OAHU THIS EVENING...BRINGING SOME SHOWERS. THERE ARE STILL MORE
LOW CLOUDS FURTHER UPSTREAM EAST OF THE ISLANDS...AND THESE CLOUDS
WILL EVENTUALLY TRACK ACROSS THE STATE LATER TONIGHT INTO EARLY
FRIDAY. THERE IS ALSO A SLOW-MOVING UPPER LEVEL TROUGH IN THE
ISLAND VICINITY. THIS TROUGH IS BRINGING HIGH CLOUDS FROM THE
CONVECTION FAR SOUTHEAST OF THE ISLANDS IN THE TROPICS...KEEPING
SKIES A LITTLE MORE CLOUDY OVER THE EASTERN ISLANDS. THE PRESENT OF
THIS UPPER LEVEL TROUGH IS ALSO KEEPING AIR MASS SLIGHT UNSTABLE IN
THE ISLAND VICINITY...WHICH IS FAVORABLE FOR WETTING RAIN TO
DEVELOP. IN ALL...TRADE WIND WEATHER WILL PREVAIL OVER THE ISLANDS
FOR THE EARLY PART OF THE WEEKEND...WITH LOCALLY STRONGER WINDS
BLOWING AT TIMES. PASSING LOW CLOUDS AND SHOWERS WILL AFFECT MAINLY
WINDWARD AND MOUNTAIN AREAS...THOUGH WINDS ARE STRONG ENOUGH TO FOR
SOME SHOWERS REACHING THE LEE AREAS OF THE SMALLER ISLANDS.

MODELS SHOW A STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD EARLY
NEXT WEEK. THIS MAY RESULT A SLIGHT BOOST TO TRADE WINDS ACROSS THE
AREA FROM SUNDAY ONWARD AS THE SURFACE GRADIENT TIGHTENS FURTHER.
THE UPPER TROUGH MAY PERSIST IN THE ISLAND VICINITY THROUGH THE
MIDDLE OF NEXT WEEK...AND MAY KEEP THE AIR MASS IN THE ISLAND
SLIGHTLY UNSTABLE THUS FAVORING SHOWER DEVELOPMENT.

&&

.AVIATION...
TRADE WINDS WILL REMAIN STRONG ENOUGH AROUND THE ISLANDS TO WARRANT
THE CONTINUATION OF THE AIRMET FOR LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE AS
AN UPPER TROUGH PERSISTS ACROSS THE STATE...BRINGING STRONG WIND
SHEAR AND DEFORMATION OVER THE AREA. MODEL GUIDANCE INDICATE THE
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA CONTINUES THROUGH
EARLY FRIDAY MORNING.

LOW CLOUDS AND SHOWERS CARRIED BY THE TRADE WINDS WILL FOCUS
PRIMARILY ACROSS WINDWARD SECTIONS. CONDITIONS WILL BE PREDOMINATELY
VFR...WITH OCCASIONAL MVFR CEILINGS AND VISIBILITIES IN SHOWERS.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH SATURDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND AS THE
MODERATE TO FRESH TRADE WINDS PERSIST.

LATEST READINGS FROM THE OFFSHORE BUOY NORTH OF OAHU INDICATED THE
SLIGHT NORTHWEST SWELL MAY HAVE PEAKED THIS EVENING. A NEW SMALL
NORTHWEST SWELL IS EXPECTED OVER THE WEEKEND. TRADE WIND SWELL WILL
REMAIN ELEVATED SOMEWHAT AS THE MODERATE TO FRESH TRADE WINDS
PERSIST.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

HUI





000
FXHW60 PHFO 180131
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
330 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH THE FORECAST PERIOD AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS. CLOUDS AND
SHOWERS WILL INCREASE EACH AFTERNOON AND EVENING ACROSS LEEWARD
PORTIONS OF THE BIG ISLAND. TOTAL RAINFALL WILL BE LIGHT.

&&

.DISCUSSION...
THERE IS LITTLE TO NO CHANGE IN FORECAST PHILOSOPHY FROM THIS
MORNING. A 1024 MB HIGH NEAR 30N148W...ABOUT 870 MILES NORTHEAST OF
THE MAIN HAWAIIAN ISLANDS...HAS AN ASSOCIATED RIDGE EXTENDING EAST
THROUGH 30N140W AND WEST THROUGH 25N180W. THIS RIDGE HAS MOVED VERY
LITTLE OVER THE PAST 12 HOURS...AND THE PRESSURE GRADIENT BETWEEN
THIS RIDGE AND EQUATORIAL LOW PRESSURE IS SUFFICIENTLY STEEP TO
SUPPORT MODERATE TO LOCALLY STRONG EASTERLY TRADE WINDS ACROSS LOCAL
WATERS THIS AFTERNOON. SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR
THE TRADITIONALLY WINDIER CHANNELS AND WATERS AROUND MAUI AND THE
BIG ISLAND. THESE HAVE BEEN EXTENDED THROUGH SATURDAY GIVEN LATEST
MODEL GUIDANCE. SCANT SHOWERS EMBEDDED WITHIN THE TRADES CONTINUE TO
SEE ENHANCEMENT FROM A PERSISTENT UPPER TROUGH ACROSS THE ISLANDS. A
RAGGED BAND OF HIGH CLOUDS EXTENDING SOUTHWEST THROUGH NORTHEAST
ACROSS THE BIG ISLAND AND ADJACENT WATERS MARKS THE EASTERN FLANK OF
THIS UPPER TROUGH. AIRMASS STABILITY VARIES FROM SLIGHTLY UNSTABLE
NEAR KAUAI WITH CAPE OVER 750 J/KG AND A NEGATIVE LIFTED INDEX
VALUE...TO STABLE OVER THE BIG ISLAND WITH CAPE LESS THAN 50 J/KG
AND A POSITIVE LIFTED INDEX VALUE. THE TRADE INVERSION FROM
YESTERDAY IS HIGHER AND WEAKER THIS AFTERNOON...INDICATING THAT THE
UPPER TROUGH CONTINUES TO HAVE A DESTABILIZING EFFECT.

MODELS SHOW STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE MAIN ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD
EARLY NEXT WEEK. THIS MAY GIVE A SLIGHT BOOST TO TRADE WINDS ACROSS
LOCAL WATERS FROM SUNDAY ONWARD AS THE GRADIENT STEEPENS. THE UPPER
TROUGH WILL PERSIST INTO THE MIDDLE OF NEXT WEEK BEFORE
FILLING...KEEPING ANY TRADE SHOWERS ACTIVE ESPECIALLY AT NIGHT.

IN GENERAL...EXPECT TRADE WIND WEATHER TO CONTINUE THROUGH THE REST
OF THE FORECAST PERIOD WITH RAINFALL FOCUSING OVER WINDWARD AND
MOUNTAIN AREAS. THE MAIN EXCEPTION WILL BE THE LEEWARD SIDE OF THE
BIG ISLAND...WHERE AFTERNOON AND EARLY EVENING CLOUDS AND SHOWERS
ARE EXPECTED EACH DAY AS ONSHORE FLOW DEVELOPS.

&&

.AVIATION...
RADAR VAD WIND PROFILES AND 00Z RAOBS SHOW WINDS GENERALLY 15-20
KT. ONLY ACARS FLIGHTS FROM KAHULUI HAVE WINDS OF 25-30 KT.
CONDITIONS ARE BORDERLINE FOR LEE TURBULENCE...AND WE HAVE NOT
RECEIVED ANY LOW-LEVEL REPORTS SINCE LAST NIGHT. HOWEVER...MODELS
SHOW WINDS PICKING UP AGAIN THROUGH THE NIGHT. WITH SOME STRONG
WINDS AT THE SURFACE AND THE STRONGER LOW-LEVEL WINDS NEAR MAUI...WE
WILL KEEP THE AIRMET GOING FOR MODERATE LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE.
STRONG WIND SHEAR AND DEFORMATION ACCOMPANY THE UPPER TROUGH THAT
EXTENDS ACROSS THE STATE. GFS GUIDANCE HIGHLIGHTS THE GREATEST
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA TO THE NORTHEAST OF
THE STATE. HOWEVER...RECENT WATER VAPOR IMAGERY SHOWS THIS AREA
MOVING WESTWARD. THIS POTENTIAL FOR HIGH-LEVEL TURBULENCE MAY
CONTINUE THROUGH THE NIGHT...CONTINUING ITS WESTWARD MOVEMENT.

CLOUDS AND SHOWERS REMAIN FOCUSED PRIMARILY ACROSS WINDWARD
SECTIONS. CONDITIONS WILL BE PREDOMINATELY VFR...WITH OCCASIONAL
MVFR CEILINGS AND VISIBILITIES IN SHOWERS. CLOUDS EAST OF MAUI HAVE
THINNED OUT THIS AFTERNOON...BUT ARE EXPECTED TO REDEVELOP AND
ENHANCE SHOWERS ACROSS WINDWARD SECTIONS OVERNIGHT INTO FRIDAY
MORNING. WE MAY EVENTUALLY NEED AN AIRMET FOR MOUNTAIN OBSCURATION
IF THE LOW CEILINGS BECOME MORE WIDESPREAD AND PERSISTENT.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND.

A SMALL SWELL FROM THE WEST NORTHWEST WILL PEAK BELOW ADVISORY
LEVELS LATER TODAY. NO OTHER SIGNIFICANT SWELLS ARE EXPECTED.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

DISCUSSION/MARINE...POWELL
AVIATION...BRAVENDER














000
FXHW60 PHFO 180131
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
330 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH THE FORECAST PERIOD AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS. CLOUDS AND
SHOWERS WILL INCREASE EACH AFTERNOON AND EVENING ACROSS LEEWARD
PORTIONS OF THE BIG ISLAND. TOTAL RAINFALL WILL BE LIGHT.

&&

.DISCUSSION...
THERE IS LITTLE TO NO CHANGE IN FORECAST PHILOSOPHY FROM THIS
MORNING. A 1024 MB HIGH NEAR 30N148W...ABOUT 870 MILES NORTHEAST OF
THE MAIN HAWAIIAN ISLANDS...HAS AN ASSOCIATED RIDGE EXTENDING EAST
THROUGH 30N140W AND WEST THROUGH 25N180W. THIS RIDGE HAS MOVED VERY
LITTLE OVER THE PAST 12 HOURS...AND THE PRESSURE GRADIENT BETWEEN
THIS RIDGE AND EQUATORIAL LOW PRESSURE IS SUFFICIENTLY STEEP TO
SUPPORT MODERATE TO LOCALLY STRONG EASTERLY TRADE WINDS ACROSS LOCAL
WATERS THIS AFTERNOON. SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR
THE TRADITIONALLY WINDIER CHANNELS AND WATERS AROUND MAUI AND THE
BIG ISLAND. THESE HAVE BEEN EXTENDED THROUGH SATURDAY GIVEN LATEST
MODEL GUIDANCE. SCANT SHOWERS EMBEDDED WITHIN THE TRADES CONTINUE TO
SEE ENHANCEMENT FROM A PERSISTENT UPPER TROUGH ACROSS THE ISLANDS. A
RAGGED BAND OF HIGH CLOUDS EXTENDING SOUTHWEST THROUGH NORTHEAST
ACROSS THE BIG ISLAND AND ADJACENT WATERS MARKS THE EASTERN FLANK OF
THIS UPPER TROUGH. AIRMASS STABILITY VARIES FROM SLIGHTLY UNSTABLE
NEAR KAUAI WITH CAPE OVER 750 J/KG AND A NEGATIVE LIFTED INDEX
VALUE...TO STABLE OVER THE BIG ISLAND WITH CAPE LESS THAN 50 J/KG
AND A POSITIVE LIFTED INDEX VALUE. THE TRADE INVERSION FROM
YESTERDAY IS HIGHER AND WEAKER THIS AFTERNOON...INDICATING THAT THE
UPPER TROUGH CONTINUES TO HAVE A DESTABILIZING EFFECT.

MODELS SHOW STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE MAIN ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD
EARLY NEXT WEEK. THIS MAY GIVE A SLIGHT BOOST TO TRADE WINDS ACROSS
LOCAL WATERS FROM SUNDAY ONWARD AS THE GRADIENT STEEPENS. THE UPPER
TROUGH WILL PERSIST INTO THE MIDDLE OF NEXT WEEK BEFORE
FILLING...KEEPING ANY TRADE SHOWERS ACTIVE ESPECIALLY AT NIGHT.

IN GENERAL...EXPECT TRADE WIND WEATHER TO CONTINUE THROUGH THE REST
OF THE FORECAST PERIOD WITH RAINFALL FOCUSING OVER WINDWARD AND
MOUNTAIN AREAS. THE MAIN EXCEPTION WILL BE THE LEEWARD SIDE OF THE
BIG ISLAND...WHERE AFTERNOON AND EARLY EVENING CLOUDS AND SHOWERS
ARE EXPECTED EACH DAY AS ONSHORE FLOW DEVELOPS.

&&

.AVIATION...
RADAR VAD WIND PROFILES AND 00Z RAOBS SHOW WINDS GENERALLY 15-20
KT. ONLY ACARS FLIGHTS FROM KAHULUI HAVE WINDS OF 25-30 KT.
CONDITIONS ARE BORDERLINE FOR LEE TURBULENCE...AND WE HAVE NOT
RECEIVED ANY LOW-LEVEL REPORTS SINCE LAST NIGHT. HOWEVER...MODELS
SHOW WINDS PICKING UP AGAIN THROUGH THE NIGHT. WITH SOME STRONG
WINDS AT THE SURFACE AND THE STRONGER LOW-LEVEL WINDS NEAR MAUI...WE
WILL KEEP THE AIRMET GOING FOR MODERATE LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE.
STRONG WIND SHEAR AND DEFORMATION ACCOMPANY THE UPPER TROUGH THAT
EXTENDS ACROSS THE STATE. GFS GUIDANCE HIGHLIGHTS THE GREATEST
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA TO THE NORTHEAST OF
THE STATE. HOWEVER...RECENT WATER VAPOR IMAGERY SHOWS THIS AREA
MOVING WESTWARD. THIS POTENTIAL FOR HIGH-LEVEL TURBULENCE MAY
CONTINUE THROUGH THE NIGHT...CONTINUING ITS WESTWARD MOVEMENT.

CLOUDS AND SHOWERS REMAIN FOCUSED PRIMARILY ACROSS WINDWARD
SECTIONS. CONDITIONS WILL BE PREDOMINATELY VFR...WITH OCCASIONAL
MVFR CEILINGS AND VISIBILITIES IN SHOWERS. CLOUDS EAST OF MAUI HAVE
THINNED OUT THIS AFTERNOON...BUT ARE EXPECTED TO REDEVELOP AND
ENHANCE SHOWERS ACROSS WINDWARD SECTIONS OVERNIGHT INTO FRIDAY
MORNING. WE MAY EVENTUALLY NEED AN AIRMET FOR MOUNTAIN OBSCURATION
IF THE LOW CEILINGS BECOME MORE WIDESPREAD AND PERSISTENT.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND.

A SMALL SWELL FROM THE WEST NORTHWEST WILL PEAK BELOW ADVISORY
LEVELS LATER TODAY. NO OTHER SIGNIFICANT SWELLS ARE EXPECTED.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

DISCUSSION/MARINE...POWELL
AVIATION...BRAVENDER














000
FXHW60 PHFO 180131
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
330 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH THE FORECAST PERIOD AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS. CLOUDS AND
SHOWERS WILL INCREASE EACH AFTERNOON AND EVENING ACROSS LEEWARD
PORTIONS OF THE BIG ISLAND. TOTAL RAINFALL WILL BE LIGHT.

&&

.DISCUSSION...
THERE IS LITTLE TO NO CHANGE IN FORECAST PHILOSOPHY FROM THIS
MORNING. A 1024 MB HIGH NEAR 30N148W...ABOUT 870 MILES NORTHEAST OF
THE MAIN HAWAIIAN ISLANDS...HAS AN ASSOCIATED RIDGE EXTENDING EAST
THROUGH 30N140W AND WEST THROUGH 25N180W. THIS RIDGE HAS MOVED VERY
LITTLE OVER THE PAST 12 HOURS...AND THE PRESSURE GRADIENT BETWEEN
THIS RIDGE AND EQUATORIAL LOW PRESSURE IS SUFFICIENTLY STEEP TO
SUPPORT MODERATE TO LOCALLY STRONG EASTERLY TRADE WINDS ACROSS LOCAL
WATERS THIS AFTERNOON. SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR
THE TRADITIONALLY WINDIER CHANNELS AND WATERS AROUND MAUI AND THE
BIG ISLAND. THESE HAVE BEEN EXTENDED THROUGH SATURDAY GIVEN LATEST
MODEL GUIDANCE. SCANT SHOWERS EMBEDDED WITHIN THE TRADES CONTINUE TO
SEE ENHANCEMENT FROM A PERSISTENT UPPER TROUGH ACROSS THE ISLANDS. A
RAGGED BAND OF HIGH CLOUDS EXTENDING SOUTHWEST THROUGH NORTHEAST
ACROSS THE BIG ISLAND AND ADJACENT WATERS MARKS THE EASTERN FLANK OF
THIS UPPER TROUGH. AIRMASS STABILITY VARIES FROM SLIGHTLY UNSTABLE
NEAR KAUAI WITH CAPE OVER 750 J/KG AND A NEGATIVE LIFTED INDEX
VALUE...TO STABLE OVER THE BIG ISLAND WITH CAPE LESS THAN 50 J/KG
AND A POSITIVE LIFTED INDEX VALUE. THE TRADE INVERSION FROM
YESTERDAY IS HIGHER AND WEAKER THIS AFTERNOON...INDICATING THAT THE
UPPER TROUGH CONTINUES TO HAVE A DESTABILIZING EFFECT.

MODELS SHOW STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE MAIN ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD
EARLY NEXT WEEK. THIS MAY GIVE A SLIGHT BOOST TO TRADE WINDS ACROSS
LOCAL WATERS FROM SUNDAY ONWARD AS THE GRADIENT STEEPENS. THE UPPER
TROUGH WILL PERSIST INTO THE MIDDLE OF NEXT WEEK BEFORE
FILLING...KEEPING ANY TRADE SHOWERS ACTIVE ESPECIALLY AT NIGHT.

IN GENERAL...EXPECT TRADE WIND WEATHER TO CONTINUE THROUGH THE REST
OF THE FORECAST PERIOD WITH RAINFALL FOCUSING OVER WINDWARD AND
MOUNTAIN AREAS. THE MAIN EXCEPTION WILL BE THE LEEWARD SIDE OF THE
BIG ISLAND...WHERE AFTERNOON AND EARLY EVENING CLOUDS AND SHOWERS
ARE EXPECTED EACH DAY AS ONSHORE FLOW DEVELOPS.

&&

.AVIATION...
RADAR VAD WIND PROFILES AND 00Z RAOBS SHOW WINDS GENERALLY 15-20
KT. ONLY ACARS FLIGHTS FROM KAHULUI HAVE WINDS OF 25-30 KT.
CONDITIONS ARE BORDERLINE FOR LEE TURBULENCE...AND WE HAVE NOT
RECEIVED ANY LOW-LEVEL REPORTS SINCE LAST NIGHT. HOWEVER...MODELS
SHOW WINDS PICKING UP AGAIN THROUGH THE NIGHT. WITH SOME STRONG
WINDS AT THE SURFACE AND THE STRONGER LOW-LEVEL WINDS NEAR MAUI...WE
WILL KEEP THE AIRMET GOING FOR MODERATE LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE.
STRONG WIND SHEAR AND DEFORMATION ACCOMPANY THE UPPER TROUGH THAT
EXTENDS ACROSS THE STATE. GFS GUIDANCE HIGHLIGHTS THE GREATEST
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA TO THE NORTHEAST OF
THE STATE. HOWEVER...RECENT WATER VAPOR IMAGERY SHOWS THIS AREA
MOVING WESTWARD. THIS POTENTIAL FOR HIGH-LEVEL TURBULENCE MAY
CONTINUE THROUGH THE NIGHT...CONTINUING ITS WESTWARD MOVEMENT.

CLOUDS AND SHOWERS REMAIN FOCUSED PRIMARILY ACROSS WINDWARD
SECTIONS. CONDITIONS WILL BE PREDOMINATELY VFR...WITH OCCASIONAL
MVFR CEILINGS AND VISIBILITIES IN SHOWERS. CLOUDS EAST OF MAUI HAVE
THINNED OUT THIS AFTERNOON...BUT ARE EXPECTED TO REDEVELOP AND
ENHANCE SHOWERS ACROSS WINDWARD SECTIONS OVERNIGHT INTO FRIDAY
MORNING. WE MAY EVENTUALLY NEED AN AIRMET FOR MOUNTAIN OBSCURATION
IF THE LOW CEILINGS BECOME MORE WIDESPREAD AND PERSISTENT.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND.

A SMALL SWELL FROM THE WEST NORTHWEST WILL PEAK BELOW ADVISORY
LEVELS LATER TODAY. NO OTHER SIGNIFICANT SWELLS ARE EXPECTED.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

DISCUSSION/MARINE...POWELL
AVIATION...BRAVENDER














000
FXHW60 PHFO 180131
AFDHFO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
330 PM HST THU APR 17 2014

.SYNOPSIS...
TRADE WIND WEATHER WILL CONTINUE ACROSS THE MAIN HAWAIIAN ISLANDS
THROUGH THE FORECAST PERIOD AS HIGH PRESSURE DOMINATES TO OUR NORTH.
CLOUDS AND SHOWERS WILL FAVOR WINDWARD AND MAUKA AREAS. CLOUDS AND
SHOWERS WILL INCREASE EACH AFTERNOON AND EVENING ACROSS LEEWARD
PORTIONS OF THE BIG ISLAND. TOTAL RAINFALL WILL BE LIGHT.

&&

.DISCUSSION...
THERE IS LITTLE TO NO CHANGE IN FORECAST PHILOSOPHY FROM THIS
MORNING. A 1024 MB HIGH NEAR 30N148W...ABOUT 870 MILES NORTHEAST OF
THE MAIN HAWAIIAN ISLANDS...HAS AN ASSOCIATED RIDGE EXTENDING EAST
THROUGH 30N140W AND WEST THROUGH 25N180W. THIS RIDGE HAS MOVED VERY
LITTLE OVER THE PAST 12 HOURS...AND THE PRESSURE GRADIENT BETWEEN
THIS RIDGE AND EQUATORIAL LOW PRESSURE IS SUFFICIENTLY STEEP TO
SUPPORT MODERATE TO LOCALLY STRONG EASTERLY TRADE WINDS ACROSS LOCAL
WATERS THIS AFTERNOON. SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR
THE TRADITIONALLY WINDIER CHANNELS AND WATERS AROUND MAUI AND THE
BIG ISLAND. THESE HAVE BEEN EXTENDED THROUGH SATURDAY GIVEN LATEST
MODEL GUIDANCE. SCANT SHOWERS EMBEDDED WITHIN THE TRADES CONTINUE TO
SEE ENHANCEMENT FROM A PERSISTENT UPPER TROUGH ACROSS THE ISLANDS. A
RAGGED BAND OF HIGH CLOUDS EXTENDING SOUTHWEST THROUGH NORTHEAST
ACROSS THE BIG ISLAND AND ADJACENT WATERS MARKS THE EASTERN FLANK OF
THIS UPPER TROUGH. AIRMASS STABILITY VARIES FROM SLIGHTLY UNSTABLE
NEAR KAUAI WITH CAPE OVER 750 J/KG AND A NEGATIVE LIFTED INDEX
VALUE...TO STABLE OVER THE BIG ISLAND WITH CAPE LESS THAN 50 J/KG
AND A POSITIVE LIFTED INDEX VALUE. THE TRADE INVERSION FROM
YESTERDAY IS HIGHER AND WEAKER THIS AFTERNOON...INDICATING THAT THE
UPPER TROUGH CONTINUES TO HAVE A DESTABILIZING EFFECT.

MODELS SHOW STRONGER HIGH PRESSURE WILL BUILD ALONG THE RIDGE
NORTHWEST OF THE MAIN ISLANDS OVER THE WEEKEND...THEN PUSH EASTWARD
EARLY NEXT WEEK. THIS MAY GIVE A SLIGHT BOOST TO TRADE WINDS ACROSS
LOCAL WATERS FROM SUNDAY ONWARD AS THE GRADIENT STEEPENS. THE UPPER
TROUGH WILL PERSIST INTO THE MIDDLE OF NEXT WEEK BEFORE
FILLING...KEEPING ANY TRADE SHOWERS ACTIVE ESPECIALLY AT NIGHT.

IN GENERAL...EXPECT TRADE WIND WEATHER TO CONTINUE THROUGH THE REST
OF THE FORECAST PERIOD WITH RAINFALL FOCUSING OVER WINDWARD AND
MOUNTAIN AREAS. THE MAIN EXCEPTION WILL BE THE LEEWARD SIDE OF THE
BIG ISLAND...WHERE AFTERNOON AND EARLY EVENING CLOUDS AND SHOWERS
ARE EXPECTED EACH DAY AS ONSHORE FLOW DEVELOPS.

&&

.AVIATION...
RADAR VAD WIND PROFILES AND 00Z RAOBS SHOW WINDS GENERALLY 15-20
KT. ONLY ACARS FLIGHTS FROM KAHULUI HAVE WINDS OF 25-30 KT.
CONDITIONS ARE BORDERLINE FOR LEE TURBULENCE...AND WE HAVE NOT
RECEIVED ANY LOW-LEVEL REPORTS SINCE LAST NIGHT. HOWEVER...MODELS
SHOW WINDS PICKING UP AGAIN THROUGH THE NIGHT. WITH SOME STRONG
WINDS AT THE SURFACE AND THE STRONGER LOW-LEVEL WINDS NEAR MAUI...WE
WILL KEEP THE AIRMET GOING FOR MODERATE LOW-LEVEL TURBULENCE.

AN AIRMET IS ALSO IN EFFECT FOR MODERATE UPPER LEVEL TURBULENCE.
STRONG WIND SHEAR AND DEFORMATION ACCOMPANY THE UPPER TROUGH THAT
EXTENDS ACROSS THE STATE. GFS GUIDANCE HIGHLIGHTS THE GREATEST
POTENTIAL FOR CLEAR-AIR TURBULENCE IN THE AREA TO THE NORTHEAST OF
THE STATE. HOWEVER...RECENT WATER VAPOR IMAGERY SHOWS THIS AREA
MOVING WESTWARD. THIS POTENTIAL FOR HIGH-LEVEL TURBULENCE MAY
CONTINUE THROUGH THE NIGHT...CONTINUING ITS WESTWARD MOVEMENT.

CLOUDS AND SHOWERS REMAIN FOCUSED PRIMARILY ACROSS WINDWARD
SECTIONS. CONDITIONS WILL BE PREDOMINATELY VFR...WITH OCCASIONAL
MVFR CEILINGS AND VISIBILITIES IN SHOWERS. CLOUDS EAST OF MAUI HAVE
THINNED OUT THIS AFTERNOON...BUT ARE EXPECTED TO REDEVELOP AND
ENHANCE SHOWERS ACROSS WINDWARD SECTIONS OVERNIGHT INTO FRIDAY
MORNING. WE MAY EVENTUALLY NEED AN AIRMET FOR MOUNTAIN OBSCURATION
IF THE LOW CEILINGS BECOME MORE WIDESPREAD AND PERSISTENT.

&&

.MARINE...
A SMALL CRAFT ADVISORY REMAINS IN EFFECT THROUGH FRIDAY AFTERNOON
FOR TYPICALLY WINDIER AREAS AROUND MAUI AND THE BIG ISLAND.

A SMALL SWELL FROM THE WEST NORTHWEST WILL PEAK BELOW ADVISORY
LEVELS LATER TODAY. NO OTHER SIGNIFICANT SWELLS ARE EXPECTED.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
SMALL CRAFT ADVISORY UNTIL 6 PM HST SATURDAY FOR MAALAEA BAY-
PAILOLO CHANNEL-ALENUIHAHA CHANNEL-BIG ISLAND LEEWARD WATERS-BIG
ISLAND SOUTHEAST WATERS.

&&

$$

DISCUSSION/MARINE...POWELL
AVIATION...BRAVENDER














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