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Hawaiian Islands Satellite Interpetation Message

227
ATHW40 PHFO 190538
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC FRI SEP 19 2014

BASED ON DATA THROUGH 0500 UTC SEPTEMBER 19 2014

LIGHT WIND...DAYTIME HEATING...AMPLE LOW LEVEL MOISTURE...AND A NOT
SO STABLE AIR MASS...ALL CONTRIBUTED TO SOME CONVECTIVE SHOWERS OVER
THE WESTERN HALF OF ALL THE SMALLER ISLANDS TODAY. THESE CLOUDS AND
SHOWERS STARTED OFF LATE THIS MORNING...BUT IS NOW IN THE PROCESS OF
CLEARING UP. AT SUNSET...SKIES ARE STILL CLOUDY ACROSS THE LEEWARD
SHORES OF ALL THE SMALLER ISLANDS.

A WEAK EASTERLY WIND FLOW RESIDES ACROSS THE ISLANDS OTHERWISE...
BLOWING AT ABOUT 10 MPH. ISOLATED TO WIDELY SCATTERED SHOWERS ARE
EMBEDDED IN THIS FLOW...ON BOTH WINDWARD AND LEEWARD WATERS OF THE
SMALLER ISLANDS. LOW CLOUD COVERAGE OVER THE SURROUNDING WATERS IS
SCATTERED TO LOCALLY BROKEN.

AS FOR THE BIG ISLAND...CONVECTIVE SHOWERS ARE RATHER LATE IN COMING.
ONLY THIS HOUR WE ARE NOTING SCATTERED SHOWERS STRETCHING FROM JUST
WEST OF KAMUELA DOWN SOUTH TO JUST BEYOND WAIKII. SKIES ARE CLOUDY
ALONG THE KONA COAST ESPECIALLY FROM KAILUA KONA TOWN TO SOUTH POINT
INCLUDING THE IMMEDIATE WATERS. A FEW SHOWERS ARE ALSO OCCURRING
ACROSS THE KAU DISTRICT FROM NEAR THE VOLCANO TO PAHALA...AND THE
UPPER SLOPES ABOVE NAALEHU. SCATTERED TO BROKEN LOW CLOUDS LITTERED
THE HAMAKUA COAST AND THE HILO AND PUNA DISTRICTS. ISOLATED SHOWERS
WERE DETECTED JUST OFF THE COAST OF LAUPAHOEHOE TO PAAUILO. OTHERWISE
FAIR SKIES RULED THE REST OF THE BIG ISLAND INCLUDING THE TWO
SUMMITS.

FURTHER OUT OF THE ISLANDS...THE REMNANTS OF AN FRONTAL BOUNDARY
IS STILL EVIDENT...LYING NEARLY STATIONARY FROM JUST EAST OF THE
BIG ISLAND TO 21N145W TO 23N142W TO 23N140W. THERE IS WHAT APPEARS
TO BE A TROUGH EXTENDING FROM 30N148W TO 27N144W TO 26N142W. THE
TROUGH IS MARKED BY A COUPLE OF TOWERING CUMULUS CLOUDS. THE TROUGH
IS SLIDING TOWARDS THE NORTHWEST. THE OPEN WATERS BETWEEN 100 AND
260 MILES NORTH OF THE ISLANDS ARE AREAS OF SCATTERED SHOWERS MOVING
SLOWLY WESTWARD.

WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL SHORTWAVE TROUGH OVER THE
KAIWI CHANNEL...EMBEDDED IN THE WESTERLY WIND FLOW HIGH ABOVE THE
ISLAND SKIES. THE TROUGH IS PROPAGATING EASTWARD AT ABOUT 20 MPH.

A COUPLE OF LOW LEVEL VORTICES ARE NOTED IN SATELLITE SOUTHEAST
THROUGH SOUTH OF THE ISLANDS THIS EVENING. THE FIRST ONE IS NEAR
14N145W OR ABOUT 760 MILES EAST SOUTHEAST OF THE BIG ISLAND. IT IS
MARKED BY A THUNDERSTORM. IT IS MOVING WEST AT 10 MPH. THE SECOND
VORTEX IS LOCATED 440 MILES SOUTH SOUTHEAST OF THE BIG ISLAND AT
13N153W. IT IS MARKED BY AN ISOLATED MODERATE THUNDERSTORM. THE
THIRD VORTEX IS LOCATED 1050 MILES SOUTHWEST OF THE BIG ISLAND AT
NEAR 07N166W. NO CONVECTION IS NOTED WITH THIS FEATURE. A MONSOONAL
TROUGH LINKED ALL THREE VORTICES.

THE DEEPEST CONVECTION IS WITH THIS ONE CELL LOCATED AT 15N155W...
WITH A CLOUD TOP OF 50000 FEET.

$$

LAU




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