Satellite Interpretation Message
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000
ATHW40 PHFO 261228
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
1230 UTC SAT JUL 26 2014

BASED ON DATA THROUGH 1200 UTC JULY 26 2014

THE PRESSURE GRADIENT SOUTH OF A SURFACE RIDGE LOCATED MORE THAN
1100 MILES NORTH OF HONOLULU WAS MAINTAINING MODERATE TRADE WINDS
ACROSS THE MAIN HAWAIIAN ISLANDS EARLY THIS MORNING. THE LOW-LEVEL
TRADE WIND FLOW WAS CARRYING SCATTERED TO LOCALLY BROKEN LOW CLOUDS
WITH EMBEDDED ISOLATED SHOWERS ACROSS THE WINDWARD HAWAIIAN WATERS.
THERE WERE ALSO PATCHES OF LOW CLOUDS AND A FEW SHOWERS OVER THE
OCEAN LEEWARD OF SOME OF THE ISLANDS.

THE INDIVIDUAL LOW CLOUD ELEMENTS OVER THE WINDWARD COASTAL WATERS
WERE GENERALLY MOVING WESTWARD AT 15 TO 20 MPH. THE HIGHEST TOPS OF
THE LOW CLOUDS IN THE VICINITY OF THE MAIN HAWAIIAN ISLANDS WERE
ESTIMATED TO BE 7 TO 8 THOUSAND FEET. UPSTREAM FROM THE ISLANDS...
THE LEADING EDGE OF A LARGE AREA OF MAINLY BROKEN LOW CLOUDS WITH
EMBEDDED SCATTERED SHOWERS WAS ABOUT 70 MILES EAST OF HILO. THIS
LEADING EDGE HAS ADVANCED WESTWARD AT ALMOST 20 MPH DURING THE PAST
6 HOURS.

AS OF 200 AM HST SATURDAY...THERE WERE SCATTERED TO BROKEN LOW
CLOUDS ACROSS PARTS OF KAUAI. BROKEN LOW CLOUDS WERE ALONG THE
WINDWARD SHORELINE AND KOOLAU RANGE OF OAHU. THERE WERE MAINLY
SCATTERED LOW CLOUDS ELSEWHERE ON OAHU. SKIES APPEARED TO BE MOSTLY
CLEAR ON MOLOKAI...WHILE A FEW LOW CLOUDS WERE DETECTED ABOVE LANAI.
ON MAUI...BROKEN LOW CLOUDS WERE AFFECTING PARTS OF THE WINDWARD
COASTAL AREAS...THE LOWER WINDWARD SLOPES OF MOUNT HALEAKALA AND THE
WESTERN MOUNTAINS. SCATTERED TO BROKEN LOW CLOUDS COVERED PORTIONS
OF THE LOWER ELEVATIONS OF THE WINDWARD BIG ISLAND.

ACCORDING TO LOOPS OF WATER VAPOR IMAGERY...THE AXIS OF A NARROW
UPPER LEVEL TROUGH EXTENDED FROM NEAR 30N 160W TO 19N 172W...OR
ABOUT 545 MILES WEST NORTHWEST OF LIHUE. THIS UPPER LEVEL FEATURE
HAS PROPAGATED TOWARD THE EAST SOUTHEAST AT ABOUT 10 MILES PER HOUR
DURING THE PAST 6 HOURS. A SUBTROPICAL JET STREAM ALONG THE
SOUTHEASTERN FLANK OF THIS TROUGH ALOFT EXTENDED FROM NEAR 20N 167W
TO 25N 158W. SOUTHWESTERLY WINDS OF 55 TO 75 MILES PER HOUR WITHIN
THE CORE OF THE JET STREAM WERE CARRYING A FEW WISPS OF CIRRUS
CLOUDS RAPIDLY TOWARD THE NORTHEAST JUST TO THE WEST OF KAUAI.
ELSEWHERE...AN UPPER LEVEL RIDGE JUST EAST OF THE BIG ISLAND
EXTENDED NORTHWARD FROM AN UPPER LEVEL ANTICYCLONE CENTERED NEAR 13N
156W. THE CLOSE PROXIMITY OF THIS UPPER LEVEL RIDGE WAS CONTRIBUTING
TO THE STABLE CONDITIONS ACROSS THE ALOHA STATE EARLY THIS MORNING.

IN THE DEEP TROPICS FAR SOUTH OF THE MAIN HAWAIIAN ISLANDS...THE
CENTRAL PACIFIC HURRICANE CENTER HAS BEEN FOLLOWING AN ELONGATED
SURFACE TROUGH LOCATED ABOUT 720 MILES SOUTH SOUTHEAST OF SOUTH
POINT ON THE BIG ISLAND...WHICH HAS BEEN MOVING WESTWARD AT ABOUT 10
MPH. HOWEVER...THERE HAS BEEN A DRAMATIC DECREASE IN THE COVERAGE OF
SHOWERS AND THUNDERSTORMS ASSOCIATED WITH THIS SYSTEM SINCE EARLY
FRIDAY EVENING. THE SURFACE TROUGH EXTENDED FURTHER EAST FROM THIS
DISTURBANCE THROUGH 10N 149W TO 12N 140W. ISOLATED MODERATE
THUNDERSTORMS WERE WITHIN 200 MILES OF THIS SECTION OF THE TROUGH.
THE HIGHEST TOPS OF THESE CUMULONIMBUS CLOUDS WERE ESTIMATED TO BE
53 THOUSAND FEET.

ELSEWHERE...THE NATIONAL HURRICANE CENTER /NHC/ IN MIAMI...FLORIDA
IS ISSUING ADVISORIES ON TROPICAL STORM GENEVIEVE...LOCATED ABOUT
1350 MILES EAST SOUTHEAST OF HILO. BASED ON THE LATEST FORECAST...
GENEVIEVE IS EXPECTED TO CROSS LONGITUDE 140W INTO THE NORTH CENTRAL
PACIFIC OCEAN LATE TONIGHT OR EARLY SUNDAY MORNING. FOR ADDITIONAL
INFORMATION ON GENEVIEVE...SEE PUBLIC ADVISORIES ISSUED BY NHC UNDER
WMO HEADER WTPZ32 KNHC AND UNDER AWIPS HEADER MIATCPEP2.

$$

HOUSTON





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