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Hawaiian Islands Satellite Interpetation Message
218
ATHW40 PHFO 251232
SIMHI
HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC SAT MAY 25 2013
BASED ON DATA THROUGH 1200 UTC MAY 25 2013
INFRARED SATELLITE IMAGERY CONTINUES TO SHOW AN AREA OF SCATTERED
TO BROKEN HIGH CLOUDS MOVING RAPIDLY EAST OVER THE SOUTHERN PORTION
OF THE MAIN HAWAIIAN ISLAND CHAIN. ADDITIONAL...THICKER...HIGH
CLOUDS ARE NOTED 150 TO 1300 MILES WEST OF THE BIG ISLAND...IN A
LINE 100 TO 150 MILES WIDE...AND ARE MOVING ON A TRAJECTORY THAT
WOULD CARRY THEM OVER THE BIG ISLAND...AND TO A LESSER EXTENT...MAUI
COUNTY AND OAHU. SKIES OVER KAUAI ARE NEARLY FREE OF HIGH CLOUDS...
BUT SKIES SOUTH OF THE ISLAND WILL LIKELY SEE INCREASING HIGH CLOUDS
LATER TODAY AS THE AREA OF INCREASED HIGH CLOUDS APPROACHING FROM
THE WEST DRAWS CLOSER. 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 UPSTREAM OF THE ISLANDS FROM KAUAI TO MAUI CONTAIN
FEW TO SCATTERED SHOWERY LOW CLOUDS...WITH BROKEN TO LOCALLY
OVERCAST SHOWERY LOW CLOUDS UPSTREAM TO THE EAST OF THE BIG ISLAND.
BROKEN LOW CLOUDS NORTH OF KAUAI 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 THE ISLAND. SKIES IN CLOSE PROXIMITY
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.
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 OVER THE CENTRAL
PORTION OF THE ISLAND CHAIN. SEVERAL LOWS ARE EMBEDDED WITHIN THIS
TROUGH...WITH A FAIRLY LARGE LOW ALOFT CENTERED ABOUT 575 MILES
WEST-SOUTHWEST OF KAUAI NEAR 21N 168W...A SMALLER LOW CENTERED ABOUT
1075 MILES NORTHEAST OF MAUI NEAR 28N 141...AND A SMALLER COMPACT
LOW CENTERED ABOUT 175 MILES NORTH-NORTHEAST OF MAUI NEAR 23N 155W.
THE LOW TO THE WEST IS DRIFTING SLOWLY TOWARD THE WEST-SOUTHWEST...
THE LOW TO THE NORTHEAST IS MOVING TOWARD THE EAST-SOUTHEAST NEAR 15
MPH...WHILE THE LOW TO THE NORTH OF MAUI IS MOVING SOUTH-SOUTHEAST
NEAR 15 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.
DEEP CONVECTION...IN THE FORM OF THUNDERSTORMS...IS ESSENTIALLY
ABSENT FROM THE TROPICAL CENTRAL NORTH PACIFIC THIS MORNING...ASIDE
FROM ISOLATED THUNDERSTORMS ASSOCIATED WITH A NORTHEAST TO SOUTHWEST
ORIENTED SURFACE TROUGH THAT EXTENDS FROM 10N 140W TO 04N 153W.
ISOLATED THUNDERSTORMS ARE LOCATED WITHIN ABOUT 200 MILES NORTHWEST
OF THE TROUGH AXIS.
$$
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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