Satellite Interpretation Message
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000
ATHW40 PHFO 301825
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1830 UTC TUE SEP 30 2014

BASED ON DATA THROUGH 1800 UTC SEPTEMBER 30 2014

AN AREA OF LOW PRESSURE IN THE MIDDLE AND UPPER LEVELS OF THE
ATMOSPHERE CONTINUES TO PRODUCE UNSTABLE CONDITIONS OVER AND AROUND
THE MAIN HAWAIIAN ISLANDS. BASED ON WATER VAPOR DATA...THE LOW WAS
CENTERED ABOUT 220 MILES NORTHEAST OF HILO AND WAS MOVING SLOWLY
NORTHEASTWARD. TWO AREAS OF THUNDERSTORMS ARE ASSOCIATED WITH THE
LOW. THE LARGER AREA EXTENDED 50 MILES ON EITHER SIDE OF A LINE FROM
27N 159W TO 22N 156W AND HAS BEEN WEAKENING OVER THE PAST SEVERAL
HOURS. THE CLOSEST THUNDERSTORM TO THE ISLAND CHAIN WAS 90 MILES
NORTHEAST OF OAHU. A SMALLER AREA OF ISOLATED THUNDERSTORMS
EXTENDED ABOUT 50 MILES NORTH OF A LINE FROM 21N 160W TO 21N 164W
WITH ITS CLOSEST CELL ABOUT 30 MILES SOUTHWEST OF HANAPEPE. THIS
AREA WAS ALSO WEAKENING OVER TIME.

TO THE NORTHWEST OF THE MAIN HAWAIIAN ISLANDS...A COLD FRONT CLOUD
BAND WAS PROGRESSING SLOWLY TO THE SOUTHEAST. THE BAND WAS 500 TO
600 MILES WIDE WITH ITS LEADING EDGE ALONG A LINE FROM 30N 160W TO
25N 167W...WHICH IS JUST NORTHWEST OF FRENCH FRIGATE SHOALS IN THE
PAPAHANAUMOKUAKEA MARINE NATIONAL MONUMENT. THUNDERSTORMS WITHIN THE
BAND WERE WITHIN 150 MILES OF THE LEADING EDGE. OUTSIDE OF THE
THUNDERSTORMS...THE REST OF THE FRONTAL BAND CONSISTED OF BROKEN TO
OVERCAST LAYERED CLOUDS.

OVER THE STATE...INITIAL VISIBLE SECTOR IMAGES REVEALED SCATTERED TO
BROKEN LOW CLOUDS OVER KAUAI...AND BROKEN TO OVERCAST LOW CLOUDS
OVER THE LOWER WINDWARD ELEVATIONS OF THE BIG ISLAND. SOUTH MAUI
NEAR WAILEA AND ULUPALAKUA ALSO HAD BROKEN LOW CLOUDS OVERHEAD. THE
REST OF THE STATE APPEARED TO HAVE JUST FEW TO SCATTERED LOW CLOUDS.
AN EAST-WEST ORIENTED 100 MILE-WIDE BAND OF BROKEN HIGH CLOUDS
ASSOCIATED WITH THE ABOVE MENTIONED UPPER LEVEL LOW WAS SENDING
OCCASIONAL FRAGMENTS OF THIN CIRRUS OVER THE SOUTHERN PORTION OF THE
BIG ISLAND.

FAR TO THE SOUTH...THUNDERSTORM ACTIVITY IN THE INTERTROPICAL
CONVERGENCE ZONE...ITCZ...WAS MAINLY SOUTH OF 10N WITH THE EXCEPTION
OF A NORTHWARD BULGE UP TO 12N 147W.

$$

KODAMA




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