Satellite Interpretation Message
Issued by NWS

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000
ATHW40 PHFO 310525
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC FRI JUL 31 2015

BASED ON DATA THROUGH 0500 UTC JULY 31 2015

AS OF 700 PM HST...WATER VAPOR SATELLITE IMAGERY SHOWED AN UPPER LOW
CENTERED NEAR 30N176W AND AN UPPER RIDGE ORIENTED FROM EAST TO WEST
OVER THE ISLANDS. A COMBINATION OF PLENTY OF DEEP-LAYER MOISTURE AND
INSTABILITY ASSOCIATED WITH THE UPPER LOW CONTINUED TO SUPPORT A
LARGE AREA OF LAYERED CLOUDS WITH EMBEDDED THUNDERSTORMS ABOUT 370
MILES WEST OF KAUAI BETWEEN 12N AND 30N FROM 175W TO 163W. THE
MAXIMUM CLOUD TOPS ASSOCIATED WITH THE THUNDERSTORMS EXTENDED TO 50
TO 55 THOUSAND FEET. SOME DEBRIS CLOUDS ASSOCIATED WITH THESE
THUNDERSTORMS WERE SPREADING EAST-NORTHEAST AROUND THE UPPER RIDGE
BETWEEN 20N AND 30N FROM 163W TO 155W...WHICH COVERED KAUAI.

ALTHOUGH MOST OF THE THUNDERSTORMS THAT WERE EVIDENT EARLIER FROM
POST-TROPICAL CYCLONE EIGHT-E...CENTERED ABOUT 830 MILES EAST
OF HILO...HAWAII...HAD DIMINISHED...ISOLATED TO SCATTERED TOWERING
CUMULUS AND CUMULONIMBUS CLOUDS WERE SHOWN BETWEEN 15N AND 17N FROM
144W TO 143W. OTHERWISE...A BROAD AREA OF BROKEN LOW CLOUDS WERE
SHOWN SWIRLING AROUND THIS REMNANT LOW FROM 13N TO 23N BETWEEN 149W
AND 140W. THE LEADING EDGE OF THIS CLOUD COVERAGE WAS ABOUT 450
MILES EAST OF HILO...HAWAII AND WAS MOVING WEST AT 10 TO 15 MPH.

ISOLATED TO SCATTERED THUNDERSTORMS ASSOCIATED WITH AN AREA OF LOW
PRESSURE THAT WAS ABOUT 600 MILES SOUTH OF HILO...HAWAII WERE
TRACKING WEST AT 10 TO 15 MPH. CLOUD TOPS ASSOCIATED WITH THIS
ACTIVITY EXTENDED TO AS HIGH AS 45 TO 50 THOUSAND FEET.

SCATTERED TO BROKEN LOW-LEVEL CLOUDS WERE SHOWN TRACKING WESTWARD
WITHIN THE TRADE WINDS AROUND THE MAIN HAWAIIAN ISLANDS. THE BULK
OF THIS COVERAGE WAS FOCUSING ALONG THE WINDWARD SIDES OF
KAUAI...MOLOKAI AND MAUI WHILE LEAVING THE LEEWARD AREAS UNDER
MOSTLY SUNNY CONDITIONS. THIS COVERAGE WAS SPILLING OVER TO THE
LEEWARD SIDES OF OAHU. BROKEN TO OVERCAST LOW CLOUDS WERE SHOWN
ACROSS THE BIG ISLAND. THE COVERAGE ACROSS THE LEEWARD SIDE WAS
ASSOCIATED WITH THE AFTERNOON SEA BREEZE THAT DEVELOPED EARLIER IN
THE AFTERNOON. CLOUD TOPS REMAINED BELOW 12 THOUSAND FEET...WHICH
LEFT THE SUMMITS UNDER MOSTLY CLEAR SKIES.

$$

AG




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