Satellite Interpretation Message
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000
ATHW40 PHFO 190502
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC SUN APR 19 2015

BASED ON DATA THROUGH 0500 UTC APRIL 19 2015

TO THE NORTHEAST...WATER VAPOR IMAGES SHOWED A TROUGH OF LOW
PRESSURE IN THE MIDDLE ATMOSPHERE. THIS FEATURE HAD LITTLE DIRECT
EFFECT ON CLOUD COVER.

TO THE NORTHWEST...THE DISSIPATING END OF A CLOUD BAND ASSOCIATED
WITH A FRONT EXTENDED ACROSS THE MAIN HAWAIIAN WATERS WITHIN 90
MILES OF THE LINE FROM 30N 174W TO 28N 180 AND FURTHER NORTHEAST AND
SOUTHWEST. THIS FEATURE REMAINED NEARLY STATIONARY.

TO THE WEST...THIN HIGH CLOUD LAYERS FROM ACROSS THE DATELINE PARTLY
TO MOSTLY OBSCURED LOWER FEATURES WEST OF THE CURVE FROM 20N 180 TO
23N 175W TO 23N 171W TO 20N 169W TO 15N 174W TO 16N 180.

TO THE SOUTH...LIGHT TO MODERATE THUNDERSTORM ACTIVITY CONTINUED IN
THE ITCZ FROM 09N TO 01N. LAYERED MIDDLE TO HIGH LAYERED DEBRIS
CLOUDS FROM THIS AND EARLIER CONVECTION OBSCURED LOWER FEATURES
MOSTLY TO PARTLY FROM 12N TO THE EQUATOR ACROSS MOST OF THE AREA. A
STREAM OF THIN HIGH CLOUD LAYERS ALSO PARTLY OBSCURED LOWER FEATURES
WITHIN 90 MILES OF THE CURVE FROM 19N 140W TO 17N 143W TO 16N 148W
TO 10N 158W.

OTHERWISE...CLOUD COVER ACROSS HAWAIIAN WATERS CONSISTED MAINLY OF
LOOSE CLUMPS OF MARINE STRATOCUMULI UP TO ABOUT 400 MILES LONG AND
120 MILES WIDE. INDIVIDUAL SMALL CUMULI ALSO OCCURRED THROUGHOUT.
THESE CLOUDS MERGED INTO AREAS OF NEARLY SOLID LOW TO MIDDLE STRATUS
OVERCAST NORTHEAST OF THE CURVE FROM 30N 147W TO 27N 149W TO 19N
142W TO 20N 140W. ELSEWHERE...THEY WERE GREATEST IN AREAL COVERAGE
WITHIN 150 MILES OF THE CURVE FROM 30N 167W TO 25N 176W TO 17N 169W
TO 14N 140W. THESE CLOUDS GENERALLY ROSE TO HEIGHTS OF 8000 TO 12000
FEET...AND MOVED TOWARD THE WEST SOUTHWEST AT AROUND 20 MILES AN
HOUR.

ACROSS THE MAIN HAWAIIAN ISLANDS...CLOUD COVER CONSISTED MOSTLY OF
MARINE CUMULI AND STRATOCUMULI MOVING ASHORE AND BANKING UP ALONG
SLOPES FACING NORTH THROUGH EAST. AFTERNOON CUMULUS BUILDUPS WITH
THEIR LAYERED DEBRIS CLOUDS ALSO WERE IMPORTANT OVER THE WEST MAUI
MOUNTAINS...NORTHWEST SLOPES OF HALEAKALA ON MAUI...AND LOWER TO
MIDDLE WEST SLOPES OF THE BIG ISLAND FROM KAU TO NORTH KONA
DISTRICTS. AREAS WITH THE LEAST CLOUD COVER WERE LIMITED MAINLY TO
NIIHAU...WEST KAUAI...THE SOUTHWEST HALF OF OAHU...THE WEST THREE
QUARTERS OF MOLOKAI...COASTAL LANAI...WEST SLOPES OF THE WEST MAUI
MOUNTAINS...THE CENTRAL ISTHMUS ON MAUI...THE SUMMIT AND SOUTH
SLOPES OF HALEAKALA ON MAUI...THE WEST COAST AND LOWER SLOPES OF THE
BIG ISLAND FROM KEAHOLE POINT TO UPOLU POINT...THE KAU DESERT ON THE
BIG ISLAND...AND INTERIOR UPLANDS OF THE BIG ISLAND ABOVE ELEVATIONS
OF ABOUT 6000 FEET. RADAR DATA FROM NEAR THE ISLANDS SHOWED
SCATTERED SHOWERS OVER AND ALONG EAST MAUI...BUT ISOLATED SHOWERS AT
MOST ELSEWHERE.

$$

RYSHKO




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