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Hawaiian Islands Satellite Interpetation Message

171
ATHW40 PHFO 241234
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC THU APR 24 2014

BASED ON DATA THROUGH 1200 UTC APRIL 24 2014

A BRISK TRADE WIND FLOW CONTINUES OVER THE HAWAIIAN ISLANDS THIS
MORNING...WITH VARYING AMOUNTS OF LOW CLOUDS TRACKING TOWARD THE
ISLANDS FROM THE EAST-NORTHEAST. LOW CLOUD COVERAGE UPWIND OF THE
ISLANDS HAS INCREASED SOMEWHAT SINCE WEDNESDAY EVENING...WITH
SCATTERED TO BROKEN CLUMPS OF SHOWERY CUMULUS /CU/ RANDOMLY
DISTRIBUTED. CLOUD TOP TEMPERATURES OF THE INCOMING CU ARE SLIGHTLY
COOLER THAN THEY WERE 6 TO 8 HOURS AGO...INDICATING THAT THE
INCOMING CLOUDS ARE REACHING A SLIGHTLY HIGHER HEIGHT...WITH CLOUD
TOP TEMPERATURES NEAR 7 DEGREES CELSIUS EQUATING TO CLOUD TOPS NEAR
11 THOUSAND FEET. WHILE THE BULK OF THE INCOMING CLOUDS AND SHOWERS
ARE STACKING UP ALONG WINDWARD COASTS AND SLOPES...THE STRONG TRADES
ARE BRIEFLY PUSHING THESE SCATTERED TO BROKEN LOW CLOUDS OVER
LEEWARD AREAS OF THE SMALLER ISLANDS. LOW CLOUDS AND SHOWERS NEAR
THE ISLANDS CONTINUE MOVING TOWARD THE WEST-SOUTHWEST AT 25 TO 30
MPH.

THE LEEWARD...OR WESTERN...PORTIONS OF THE ISLANDS FROM KAUAI TO
MAUI GENERALLY FEATURE PARTLY CLOUDY SKIES...AS PERIODS OF MOSTLY
CLEAR SKIES ARE INTERRUPTED BY SCATTERED TO BROKEN CU SPREADING
WESTWARD FROM THE MOUNTAINS. WINDWARD PORTIONS OF KAUAI AND OAHU
HAVE BROKEN SHOWERY CU MOVING ASHORE...WITH FEW TO SCATTERED LOW
CLOUDS NOTED OVER WINDWARD WATERS EAST OF MAUI AND THE BIG ISLAND...
THUS SLIGHTLY WETTER AND CLOUDIER CONDITIONS ARE OVER KAUAI AND
OAHU. WHILE RANDOMLY DISTRIBUTED PATCHES OF LOW CLOUDS PREVAIL
UPSTREAM OF THE ISLANDS FOR SEVERAL HUNDRED MILES...AND LACK
SIGNIFICANT ORGANIZATION...THE INCREASED MOISTURE OVER KAUAI AND
OAHU IS IS ASSOCIATED WITH THE SOUTHERN FRINGE OF A 500 TO 700 MILE
LONG...75 TO 100 MILE WIDE...EAST TO WEST ORIENTED DIFFUSE BAND OF
BROKEN CU. THIS BAND EXTENDS FROM WATERS JUST NORTHWEST OF KAUAI TO
SEVERAL HUNDRED MILES NORTHEAST OF OAHU. PORTIONS OF THE POORLY
ORGANIZED BAND TO THE NORTHEAST OF THE ISLANDS HAVE SAGGED SOUTHWARD
OVER THE PAST SEVERAL HOURS...AND SOME OF THIS MOISTURE NOW SEEMS
POISED TO MOVE OVER THE ISLANDS AT SOME POINT AS IT IS NOW DIRECTLY
UPSTREAM OF AT LEAST SOME OF THE ISLANDS.

PATCHES OF SCATTERED...AND DIMINISHING...HIGH-LEVEL CIRRUS CLOUDS
ARE NOTED ABOUT 400 TO 1200 MILES NORTHEAST OF THE ISLANDS...AND
WATER VAPOR IMAGERY SHOWS THESE CLOUDS ARE ASSOCIATED WITH A
NORTHEAST TO SOUTHWEST ORIENTED TROUGH ALOFT...AND A DISSIPATING
EMBEDDED LOW ALOFT...THAT IS ABOUT 300 MILES NORTHEAST OF THE
ISLANDS. THE TROUGH ALOFT HAS AN AXIS THAT PASSES NORTH OF
KAUAI...ALONG A LINE FROM 30N150W TO 25N160W TO 18N180...WITH A
WESTERLY FLOW ALOFT PREVAILING OVER THE ISLANDS.

$$

BIRCHARD



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It was last modified on: Tue, Sep 21 2010 - 2314 UTC
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