Satellite Interpretation Message
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000
ATHW40 PHFO 181210
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC THU DEC 18 2014

BASED ON DATA THROUGH 1200 UTC DECEMBER 18 2014

WATER VAPOR IMAGES SHOWED A BROAD RIDGE OF HIGH PRESSURE IN THE
MIDDLE ATMOSPHERE OVER AND TO THE NORTHEAST OF THE MAIN HAWAIIAN
ISLANDS. HOWEVER...A WEAK AREA OF LOW PRESSURE IN THE MIDDLE
ATMOSPHERE LINGERED TO THE SOUTHWEST NEAR THE DATELINE. TOWERING
CUMULI DEVELOPED UNDER THIS LOW WITHIN 60 MILES OF THE POINT 11N
179W. HIGH TO MIDDLE CLOUD LAYERS ASSOCIATED WITH THIS CONVECTION...
OR WITH THE LOW MORE GENERALLY...MOSTLY TO PARTLY OBSCURED LOWER
FEATURES BETWEEN THE DATELINE AND THE CURVE FROM 13N 180 TO 14N 175W
TO 16N 177W TO 21N 168W TO 22N 164W TO 21N 162W TO 21N 157W TO 17N
155W TO 18N 150W TO 15N 147W TO 10N 155W.

TO THE NORTHWEST...STRATOCUMULUS FRAGMENTS FROM A DISSIPATING FRONT
NOW LOCATED MOSTLY NORTH OF 30N SLOWLY DISINTEGRATED WITHIN 60 MILES
OF THE LINE FROM 30N 160W TO 27N 166W.

TO THE NORTH THROUGH NORTHEAST...MARINE STRATOCUMULI MERGED INTO
AREAS OF NEARLY SOLID LOW TO MIDDLE STRATUS OVERCAST. THE AREA OF
OVERCAST SHIFTED RAPIDLY UNDER THE INFLUENCE OF PASSING GRAVITY
WAVES...BUT GENERALLY WAS LOCATED NORTHEAST OF THE CURVE FROM 30N
147W TO 26N 156W TO 24N 153W TO 25N 162W TO 24N 165W TO 20N 152W TO
19N 140W.

OTHERWISE...CLOUD COVER ACROSS HAWAIIAN WATERS CONSISTED MAINLY OF
LOOSELY PACKED MARINE STRATOCUMULI AND CUMULI LOCALLY MERGING INTO
CLUMPS UP TO ABOUT 240 MILES ACROSS. THESE CLOUDS GENERALLY ROSE TO
HEIGHTS OF 6000 TO 9000 FEET. THEY TYPICALLY MOVED TOWARD THE WEST
SOUTHWEST AT 15 TO 20 MILES AN HOUR...THOUGH NORTH OF 26N THEY
TURNED MORE TOWARD THE NORTHWEST.

ACROSS THE MAIN HAWAIIAN ISLANDS...THIN HIGH CLOUD LAYERS FROM THE
WEST PARTLY OBSCURED LOWER FEATURES OVER MAUI COUNTY. WHERE IT WAS
VISIBLE...LOWER CLOUD COVER CONSISTED MOSTLY OF MARINE STRATOCUMULI
AND CUMULI MOVING ASHORE ALONG SLOPES FACING NORTH THROUGH EAST.
LAYERED DEBRIS CLOUDS FROM AFTERNOON CUMULUS BUILDUPS ON THURSDAY
LARGELY HAD DISSIPATED. THESE LOWER CLOUDS GENERALLY ROSE TO HEIGHTS
OF 7000 TO 9000 FEET.

RADAR DATA FROM NEAR THE ISLANDS SHOWED SCATTERED SHOWERS OVER EAST
THROUGH SOUTH KAUAI...THE KOOLAU RANGE ON OAHU...ALONG THE COAST
NEAR UPOLU POINT ON THE BIG ISLAND...OVER COASTAL PUNA DISTRICT ON
THE BIG ISLAND...OFFSHORE TO THE NORTHWEST THROUGH EAST OF OAHU...
WELL OFFSHORE TO THE SOUTHWEST OF MAUI COUNTY...AND OFFSHORE TO THE
SOUTHEAST OF THE BIG ISLAND. ELSEWHERE...RADAR DATA SHOWED ISOLATED
SHOWERS AT MOST.

$$

RYSHKO




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