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Hawaiian Islands Satellite Interpetation Message
027
ATHW40 PHFO 250536
SIMHI
HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC SAT MAY 25 2013
BASED ON DATA THROUGH 0500 UTC MAY 25 2013
EVENING INFRARED SATELLITE IMAGERY SHOWS AN AREA OF SCATTERED TO
BROKEN HIGH CLOUDS MOVING RAPIDLY EAST OVER THE SOUTHERN PORTION OF
THE MAIN HAWAIIAN ISLAND CHAIN...WHILE SKIES NEAR KAUAI ARE NEARLY
FREE OF HIGH CLOUDS. MEANWHILE...AT THE SURFACE...A STRENGTHENING
TRADE WIND FLOW IS CARRYING POCKETS OF SHOWERY LOW CLOUDS TOWARD THE
WEST-SOUTHWEST...AT SPEEDS NEAR 20 MPH.
SKIES NEAR AND OVER KAUAI ALSO CONTAIN FEW LOW CLOUDS THIS
EVENING...WITH SCATTERED TO BROKEN LOW CLOUDS MOVING OVER WINDWARD
PORTIONS OF OAHU...MOLOKAI...MAUI AND THE BIG ISLAND. BROKEN LOW
CLOUDS OVER OAHU WINDWARD WATERS ARE PART OF A POORLY-ORGANIZED...
100 TO 150 MILE WIDE...NORTH TO SOUTH ORIENTED...BAND THAT EXTENDS
ABOUT 500 MILES TO THE NORTH OF OAHU. NEAR THE ISLANDS...SKIES WEST
OF THE BAND ARE MOSTLY CLEAR...AND EAST OF THE BAND...SCATTERED TO
BROKEN LOW CLOUDS ARE SEEN...WITH LOW CLOUDS APPEARING TO MOVE MORE
RAPIDLY WESTWARD THAN THOSE WEST OF THE BAND. THEREFORE...IT APPEARS
SAFE TO SAY THAT WEAK LOW-LEVEL CONVERGENCE IS HELPING TO SUPPORT
THIS CLOUD BAND...AND MARKS A BIT OF A LOCAL SURGE IN TRADE WIND
SPEEDS. HIGH CLOUDS NEAR MAUI AND THE BIG ISLAND ARE OBSCURING SOME
OF THE LOW CLOUD DETAILS...BUT BREAKS IN THE HIGH CLOUDS REVEAL
SCATTERED LOW CLOUDS CURRENTLY MOVING ASHORE OVER WINDWARD SLOPES
AND COASTS...WITH BROKEN TO LOCALLY OVERCAST LOW CLOUDS LURKING
OFFSHORE...AND EXTEND UP TO 300 MILES TO THE EAST.
WATER VAPOR IMAGERY SHOWS THAT THE HIGH CLOUDS OVER THE ISLAND CHAIN
ARE DEVELOPING WITHIN A WESTERLY FLOW ALOFT...WITH AN EAST-NORTHEAST
TO WEST-SOUTHWEST ORIENTED TROUGH ALOFT SITUATED JUST NORTH OF
KAUAI. SEVERAL LOWS ARE EMBEDDED WITHIN THIS TROUGH...WITH A FAIRLY
LARGE LOW ALOFT CENTERED ABOUT 600 MILES WEST OF KAUAI NEAR 22N
169W...A SMALLER LOW CENTERED ABOUT 1000 MILES NORTHEAST OF MAUI
NEAR 29N 144W...AND A WEAKER AND SMALLER LOW CENTERED ABOUT 275
MILES NORTH OF MAUI NEAR 25N 156W. THE LOW TO THE WEST OF DRIFTING
SLOWLY TOWARD THE WEST-SOUTHWEST...THE LOW TO THE NORTHEAST IS
MOVING TOWARD THE EAST-SOUTHEAST NEAR 10 MPH...WHILE THE LOW TO THE
NORTH OF MAUI IS MOVING SOUTH-SOUTHEAST NEAR 10 MPH. THE EXPANSIVE
TROUGH CONNECTING THESE FEATURES IS NEARLY 3000 MILES LONG...
EXTENDING FROM 32N 136W TO 12N 176E...AND IS A COMMON FEATURE OF THE
SPRING AND SUMMER UPPER ATMOSPHERE NEAR THE ISLANDS...KNOWN AS THE
TROPICAL UPPER TROPOSPHERIC TROUGH...OR TUTT.
$$
BIRCHARD
Bulletins, Forecasts and Observations are courtesy of Honolulu National Weather Service Forecast Office
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This page is maintained voluntarily by the MKWC and the UHMET faculty, staff, and students.
It was last modified on: Tue, Sep 21 2010 - 2314 UTC
Send comments to: Ryan Lyman
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