Satellite Interpretation Message
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000
ATHW40 PHFO 251211
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC THU DEC 25 2014

BASED ON DATA THROUGH 1200 UTC DECEMBER 25 2014

WATER VAPOR IMAGES SHOWED AN AREA OF LOW PRESSURE IN THE MIDDLE
ATMOSPHERE JUST NORTH OF THE MAIN HAWAIIAN ISLANDS. ALTHOUGH NO
CLOUDS WERE UNIQUELY ASSOCIATED WITH THE LOW...IT SIGNIFICANTLY
INFLUENCED CLOUD COVER ACROSS MOST OF THE HAWAIIAN WATERS.

TO THE NORTHEAST THROUGH SOUTHEAST...A BAND OF DEEP CLOUD LAYERS
ASSOCIATED WITH A FRONT EXTENDED ACROSS HAWAIIAN WATERS NORTH OF THE
CURVE FROM 27N 140W TO 16N 153W TO 16N 158W TO 21N 153W TO 26N 155W
TO 28N 160W TO 30N 161W. THIS FEATURE SHIFTED NORTH SLOWLY.

TO THE SOUTHEAST...LIGHT THUNDERSTORM ACTIVITY CONTINUED IN THE ITCZ
FROM 11N TO 05N...ALMOST ENTIRELY EAST OF 156W. LAYERED HIGH TO
MIDDLE DEBRIS CLOUDS FROM THIS AND EARLIER CONVECTION OBSCURED LOWER
FEATURES PARTLY TO MOSTLY SOUTHEAST OF THE CURVE FROM 27N 140W TO
16N 147W TO 19N 149W TO 09N 148W TO 09N 140W...AND ALSO PARTLY FROM
12N TO THE EQUATOR ACROSS MOST OF THE AREA.

TO THE NORTHWEST...A DISSIPATING BAND OF LOW TO MIDDLE CLOUD LAYERS
ASSOCIATED WITH A SECOND FRONT EXTENDED ACROSS HAWAIIAN WATERS
WITHIN 45 MILES OF THE CURVE FROM 30N 175W TO 29N 180. THIS FEATURE
MOVED SOUTH SLOWLY. THIN HIGH CLOUD LAYERS ASSOCIATED WITH A JET
STREAM PASSED OVERHEAD...PARTLY OBSCURING LOWER FEATURES NORTH OF
THE CURVE FROM 30N 172W TO 27N 171W TO 29N 180.

ELSEWHERE...CLOUD COVER ACROSS HAWAIIAN WATERS CONSISTED MAINLY OF
COLD-AIR CUMULI MERGING INTO AREAS OF NEARLY SOLID LOW TO MIDDLE
OVERCAST NORTHWEST OF THE CURVE FROM 30N 161W TO 18N 158W TO 09N
171W TO 10N 180 TO 22N 179W TO 30N 168W. THESE CLOUDS GENERALLY
MOVED TOWARD THE SOUTH TO SOUTHWEST AT 10 TO 25 MILES A HOUR...AND
ROSE TO HEIGHTS OF 8000 TO 10000 FEET.

ACROSS THE MAIN HAWAIIAN ISLANDS...CLOUD COVER CONSISTED MOSTLY OF
COLD-AIR CUMULI MOVING ASHORE ALONG WEST THROUGH NORTH SLOPES OF
KAUAI AND OAHU...THOUGH CLOUD LAYERS ORIGINALLY ASSOCIATED WITH THE
FIRST FRONT STILL LANGUISHED ALONG LOWER NORTH THROUGH EAST SLOPES
OF THE BIG ISLAND. THESE CLOUDS VARIED IN HEIGHT FROM 5000 TO 10000
FEET.

RADAR DATA FROM NEAR THE ISLANDS SHOWED SCATTERED SHOWERS OFFSHORE
AROUND OAHU...BUT ISOLATED SHOWERS AT MOST ELSEWHERE. STRONG RADAR
RETURNS OVER LOWER TO MIDDLE SOUTHEAST SLOPES OF THE BIG ISLAND
PROBABLY WERE SPURIOUS.

$$

RYSHKO




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