Satellite Interpretation Message
Issued by NWS

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000
ATHW40 PHFO 240040
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0030 UTC WED AUG 24 2016

BASED ON DATA THROUGH 0000 UTC AUGUST 24 2016

LATEST GEOSTATIONARY SATELLITE IMAGES CENTERED OVER THE MAIN HAWAIIAN
ISLANDS CONTINUE TO ARRIVE AT A GREATER THAN NORMAL FREQUENCY DUE
TO RAPID SCAN OPERATIONS...WITH IMAGES AVAILABLE EVERY 2 TO 7 MINUTES.
RAPID SCAN OPERATIONS ARE SLATED TO CONTINUE THROUGH EARLY THURSDAY
MORNING. AFTER A BIT OF A BREAK FROM OVERNIGHT THUNDERSTORMS AND
HEAVY SHOWERS THIS MORNING...WEATHER HAS TURNED ACTIVE OVER THE
BIG ISLAND ONCE AGAIN THIS AFTERNOON...WITH WIDESPREAD THUNDERSTORMS
DROPPING HEAVY SHOWERS...ESPECIALLY OVER INTERIOR AND UPSLOPE
AREAS. ELSEWHERE AROUND THE ISLAND CHAIN...SKIES HAVE BECOME
CLOUDIER SINCE THIS MORNING...AND LOCALLY HEAVY SHOWERS ARE
IMPACTING PORTIONS OF MAUI THIS AFTERNOON. LOW CLOUDS NEAR THE
ISLANDS ARE GENERALLY MOVING TOWARD THE WEST OR NORTHWEST AT
SPEEDS BETWEEN 10 AND 15 MPH.

ASIDE FROM THE WIDESPREAD HEAVY RAIN...LIGHTNING AND OVERCAST
LAYERED CLOUDS BLANKETING THE BIG ISLAND...A LARGE CLUSTER OF
COLD CLOUD TOPS CONTINUES TO PERSIST OVER NEAR SHORE HAWAIIAN
COASTAL WATERS AND HAWAIIAN OFFSHORE WATERS TO THE SOUTH OF
OAHU...AND SOUTHWEST OF MAUI COUNTY. HIGHEST CLOUD TOPS IN THIS
AREA...AND THOSE OVER THE BIG ISLAND...EXTEND AS HIGH AS 40 TO 50
THOUSAND FEET. ANOTHER CLUSTER OF COLD CLOUD TOPS IS NOTED OVER
WATERS SOUTH OF THE BIG ISLAND...BUT THIS AREA HAS BEEN WEAKENING
OVER THE PAST COUPLE OF HOURS.

WATER VAPOR IMAGERY SHOWS A CLOSED LOW ALOFT CENTERED TO THE
DISTANT NORTHWEST OF THE ISLANDS NEAR 29N 171W...WITH A TROUGH
ALOFT TO THE DISTANT NORTHEAST. THUNDERSTORMS ASSOCIATED WITH THE
CLOSED LOW ARE BETWEEN THE MAIN HAWAIIAN ISLANDS AND MIDWAY ATOLL
ARE LOCATED FROM 21N TO 28N BETWEEN 165W AND 169W. A WEAK RIDGE
ALOFT IS NOTED OVER THE ISLANDS...WHICH MAKES THE THUNDERSTORM
DEVELOPMENT NEAR THE ISLANDS SOMEWHAT DIFFICULT TO EXPLAIN USING
TRADITIONAL SATELLITE IMAGERY. PRECIPITABLE WATER VALUES FROM
POLAR ORBITER SATELLITES INDICATE THAT LOW LEVEL MOISTURE NEAR THE
ISLANDS IS QUITE HIGH...NEAR THE UPPER END OF WHAT IS TYPICALLY
OBSERVED IN HAWAII...AND THE PRESENCE OF THIS MOISTURE IS LIKELY A
PRIMARY CONTRIBUTOR TO THE HEAVY SHOWERS AND THUNDERSTORMS.

$$

BIRCHARD



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