Satellite Interpretation Message
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000
ATHW40 PHFO 260537
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC TUE JUL 26 2016

BASED ON DATA THROUGH 0500 UTC JULY 26 2016

USING THE FINAL VISIBLE IMAGES OF THE DAY...THE POORLY-DEFINED
AND INCREASINGLY DIFFICULT TO LOCATE CENTER OF POST-TROPICAL
CYCLONE DARBY IS SEEN ABOUT 275 MILES WEST-NORTHWEST OF
HONOLULU...EMBEDDED WITHIN A NORTHEAST TO SOUTHWEST ORIENTED
SURFACE TROUGH. ISOLATED THUNDERSTORMS ARE DEVELOPING WHERE LOW-
LEVEL CONVERGENCE ASSOCIATED WITH THE SURFACE TROUGH IS
INTERACTING WITH A TROUGH ALOFT THAT IS WELL DEPICTED IN WATER
VAPOR IMAGERY. A LOW ALOFT NEAR 30N 160W IS EMBEDDED WITHIN THIS
NORTHEAST TO SOUTHWEST ORIENTED TROUGH ALOFT...WITH SOUTHWESTERLY
SHEAR PROVIDED BY THIS TROUGH PREVENTING DARBY FROM REDEVELOPING
INTO A TROPICAL CYCLONE. DARBY...AND THE LOW-LEVEL TROUGH IN
WHICH IT IS EMBEDDED...ARE MOVING TOWARD THE WEST-NORTHWEST NEAR
10 MPH.

TO THE EAST OF THE DARBY REMNANT...A TRADE WIND FLOW IS IN THE
PROCESS OF BECOMING RE-ESTABLISHED OVER THE MAIN HAWAIIAN
ISLANDS...WITH LOW CLOUDS NEAR AND SOUTH OF THE BIG ISLAND MOVING
RATHER QUICKLY FROM EAST TO WEST...AT SPEEDS BETWEEN 15 AND 20
MPH. LOW CLOUDS NEAR MAUI COUNTY AND OAHU ARE MOVING TOWARD THE
WEST-NORTHWEST AT SPEEDS BETWEEN 10 AND 15 MPH...WHILE LOW CLOUDS
NEAR KAUAI ARE MOVING TOWARD THE NORTH-NORTHWEST AT SIMILAR
SPEEDS. THIS TURNING IN THE LOW-LEVEL WIND FIELD IS DUE TO THE
PRESENCE OF DARBY AND THE SURFACE TROUGH TO THE WEST OF KAUAI.

LOW CLOUD COVER IS A LITTLE GREATER OVER KAUAI AND OAHU AS
COMPARED TO MAUI COUNTY AND THE BIG ISLAND...WHERE A MOSTLY DRY
WEATHER PATTERN HAS MOVED IN...WITH LOW CLOUD COVERAGE LOWER THAN
NORMAL. SCATTERED TO LOCALLY BROKEN LOW CLOUDS ARE NOTED ALONG
THE LOWER SLOPES OF BOTH MAUI AND THE BIG ISLAND...BUT WINDWARD
HALEAKALA IS UNUSUALLY CLEAR...AS IS A LARGE PORTION OF WINDWARD
BIG ISLAND. THE LOW CLOUDS NEAR KAUAI AND OAHU ARE DROPPING
ISOLATED SHOWERS...MAINLY NEAR AND SOUTHEAST OF KAUAI. SKIES OVER
THESE ISLANDS ARE DOMINATED BY STABLE TO BROKEN CUMULUS.

OUT TO ABOUT 500 MILES EAST OF THE ISLANDS...THE TRADE WIND FLOW
PRIMARILY CONSISTS OF SCATTERED STABLE LOW CLOUDS...MAINLY
STRATOCUMULUS...WITH A FEW AREAS WITH BROKEN LOW CLOUD
COVERAGE...AND JUST A FEW SHOWERY LOW CLOUDS. BEYOND 500 MILES
OUT...EAST OF ABOUT 148W...THE LOW CLOUD FIELD IS DOMINATED BY
BROKEN TO OVERCAST STRATUS CLOUDS.

$$

BIRCHARD


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