Satellite Interpretation Message
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000
ATHW40 PHFO 200021
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0030 UTC SAT DEC 20 2014

BASED ON DATA THROUGH 0000 UTC DECEMBER 20 2014

A SLOW-MOVING SURFACE RIDGE RUNS ACROSS THE NORTHERN PORTION OF THE
AREA...MAINTAINING A RATHER STABLE TRADE WIND FLOW OVER THE MAIN
HAWAIIAN ISLANDS. A SURFACE HIGH PRESSURE CENTER REMAINS ROUGHLY
1000 MILES NORTHEAST OF THE ISLANDS NEAR 29N143W ACCORDING TO LOW
CLOUD MOTIONS. A RIDGE EXTENDS WESTWARD FROM THE HIGH TO ABOUT 300
MILES NORTH OF KAUAI NEAR 27N160W...NEAR GARDNER PINNACLES AT
24N168W...TO 22N180.

A STABLE TRADE WIND FLOW DOMINATES OVER THE MAIN HAWAIIAN ISLANDS
WITH INDIVIDUAL LOW CLOUDS MOVING FROM JUST SOUTH OF DUE EAST
AROUND 25 MPH. A POCKET OF SLIGHTLY ENHANCED MOISTURE MARKED BY
CUMULUS CLOUDS HAD BEEN FOCUSED OVER MAUI COUNTY THIS MORNING. CLOUD
COVERAGE THINNED CONSIDERABLY DUE TO DAY TIME HEATING AS THIS POCKET
OF MOISTURE REACHED OAHU...LEAVING ONLY SCATTERED CUMULUS CLOUDS
WITH TOPS BELOW 7000 FT OFF OF WINDWARD OAHU. THIS MOISTURE IS
SUPPORTING BROKEN LOW CLOUDS OVER THE KOOLAU RANGE WHILE SCATTERED
TO BROKEN LOW CLOUDS ARE BEING CARRIED OVER THE REMAINDER OF OAHU.
CLOUD COVER OVER WINDWARD SLOPES OF THE REST OF THE ISLAND CHAIN IS
SLIGHTLY LESS THAN THAT SEEN ON OAHU AND IS COMPRISED OF MOSTLY
STABLE STRATOCUMULUS. EVEN LEEWARD BIG ISLAND CLOUD COVER IS LESS
THAN NORMAL...WITH A FEW SMALL POCKETS OF LOW CLOUDS OBSERVED.

MID LEVEL RIDGING IS CREATING SUBSIDENCE OVER THE ISLANDS...WHILE A
SHALLOW BUT SHARP UPPER LEVEL TROUGH JUST SOUTH OF THE BIG ISLAND IS
MAINTAINING A BAND OF BROKEN HIGH CLOUDS. THE UPPER LEVEL TROUGH
AXIS IS CREEPING SOUTHWARD AND RUNS WESTWARD ALONG 21N140W...
18N165W...AND 10N180. ASSOCIATED...BROKEN HIGH CLOUDS HAVE THINNED
DURING THE DAY BUT PERSIST BETWEEN 17N AND 13N EAST OF 170W AND
SOUTH OF 14N WEST OF 170W.

ELSEWHERE...A COLD FRONT IS POISED TO MOVE ONTO MIDWAY ATOLL. THE
LEADING EDGE HAS MOVED OVER KURE ATOLL AND IS ADVANCING TOWARD THE
EAST AT AROUND 30 MPH. THE FRONT IS COMPRISED OF A 275 MILE-WIDE
BAND OF OVERCAST LOW CLOUDS.

$$

DWROE





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