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272
ATHW40 PHFO 210534
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC SUN SEP 21 2014

BASED ON DATA THROUGH 0500 UTC SEPTEMBER 21 2014

REGIONAL SATELLITE IMAGERY SHOWS THAT WHILE THE MAIN HAWAIIAN
ISLANDS LIE IN AN AREA OF RELATIVELY FEW LOW CLOUDS...SKIES OVER
MOST ISLAND AREAS AND ADJACENT WATERS ARE MOSTLY CLOUDY. THE CLOUDS
DEVELOPED OVER THE ISLANDS LATE THIS MORNING AND DURING THE
AFTERNOON...IN RESPONSE TO SEA BREEZES CONVERGING OVER THE ISLANDS.

ISOLATED COLD CLOUD TOPS HAVE BEEN NOTED OVER THE ISLANDS OVER THE
COURSE OF THE AFTERNOON...REPRESENTING AREAS OF HEAVY SHOWERS. WHILE
MOST OF THE CLOUD TOPS OVER THE ISLANDS AND NEAR SHORE WATERS ARE IN
THE PROCESS OF WARMING...REPRESENTING A WEAKENING TREND TO THE
SHOWERS...A COUPLE OF AREAS OF COLD CLOUD TOPS ARE STILL NOTED. THE
COLDEST CLOUD TOPS ARE CURRENTLY NOTED OVER SOUTHEAST BIG ISLAND
SLOPES...WHERE CLOUD TOP TEMPERATURES NEAR -35 C CORRELATE TO CLOUD
TOPS NEAR 35 THOUSAND FEET. INFRARED IMAGERY SHOWS CLOUD TOPS
COOLING OVER INTERIOR AND SOUTHWEST OAHU OVER THE PAST HOUR OR SO...
ASSOCIATED WITH DEVELOPING SHOWERS THAT ARE SEEN BY RADAR.
ELSEWHERE...BROKEN TO LOCALLY OVERCAST SKIES ARE NOTED OVER THE
ISLANDS AND NEAR SHORE WATERS.

WATER VAPOR IMAGERY SHOWS A SHARP TROUGH ALOFT OVER THE ISLAND
CHAIN...WITH THE NORTHEAST TO SOUTHWEST ORIENTED TROUGH OVER MAUI
COUNTY...AND IS MOVING TOWARD THE SOUTHEAST AT 10 TO 15 MPH. WITH
THE TROUGH ALIGNED IN THIS MANNER...WINDS ALOFT OVER KAUAI AND OAHU
ARE FROM THE NORTHEAST...WHILE WINDS ALOFT OVER THE BIG ISLAND ARE
FROM THE SOUTHWEST. A RIDGE ALOFT IS SEEN TO THE DISTANT SOUTHEAST
OF THE MAIN HAWAIIAN ISLANDS...AND SOUTHWESTERLY WINDS ALOFT BETWEEN
THE TROUGH AND THE RIDGE ARE LEADING TO UPPER LEVEL WINDS THAT ARE
NOT CONDUCIVE FOR THE FURTHER DEVELOPMENT OF A WESTWARD-MOVING
TROPICAL DISTURBANCE LOCATED ABOUT 400 MILES SOUTH-SOUTHWEST OF
OAHU. SCATTERED SHOWERS AND THUNDERSTORMS...AS WELL AS LAYERED MID
AND HIGH LEVEL CLOUDS...ASSOCIATED WITH THIS DISTURBANCE ARE LOCATED
FROM 13N TO 19N BETWEEN 153W AND 160W.

WHILE THE ISLANDS LIE IN AN AREA OF RELATIVELY FEW LOW CLOUDS ON THE
LARGE SCALE...AN EAST TO WEST ORIENTED CLOUD BAND IS ABOUT 525 TO
600 MILES NORTH OF OAHU...SAGGING SOUTHWARD SLOWLY. ANOTHER CLUSTER
OF NEARLY STATIONARY LOW CLOUDS IS ABOUT 300 TO 400 MILES NORTH OF
MAUI COUNTY.

$$

BIRCHARD





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