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000
ATHW40 PHFO 250025
SIMHI

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0030 UTC SAT MAY 25 2013

BASED ON DATA THROUGH 0000 UTC MAY 25 2013

WATER VAPOR LOOP...SHOWING FEATURES MAINLY ABOVE ABOUT 24000
FEET...DEPICTS AN UPPER TROUGH ORIENTED NORTHEAST TO SOUTHWEST
ACROSS MUCH OF THE CENTRAL NORTH PACIFIC. WITH AN AXIS EXTENDING
THROUGH 31N140W...24N160W AND 15N175W...THIS FEATURE JUST NORTH OF
THE MAIN HAWAIIAN ISLANDS HAS LINGERED ACROSS THE AREA FOR THE PAST
COUPLE OF DAYS. THE SOUTHERN FLANK OF THIS UPPER TROUGH IS MARKED BY
A RAGGED AND THICKENING 300 MILE WIDE BAND OF BROKEN HIGH CLOUDS
GENERALLY SOUTH OF A LINE FROM 22N158W TO 18N170W TO 13N180W. BROKEN
TO OVERCAST LAYERED CLOUDS NORTH OF A LINE FROM 39N140W TO 37N160W
TO 32N180W SIMULTANEOUSLY MARK THE NORTHERN FLANK OF THE UPPER
TROUGH AND THE SOUTHERN EDGE OF A BROAD FRONTAL CLOUD BAND.

THE MAIN SURFACE FEATURE ACROSS THE CENTRAL NORTH PACIFIC...AT LEAST
SOUTH OF 40N...IS A BROAD ANTICYCLONIC CIRCULATION CENTERED NEAR
37N144W...FAR NORTHEAST OF THE MAIN HAWAIIAN ISLANDS. THIS
CIRCULATION...ACTUALLY A SUBTROPICAL HIGH...HAS A RIDGE WHICH
EXTENDS THROUGH 30N160W AND 22N180W...ALMOST DIRECTLY BENEATH THE
UPPER TROUGH AXIS. LOW LEVEL FLOW IS GENERALLY EAST TO WEST SOUTH OF
THE RIDGE AXIS...INCLUDING ACROSS THE MAIN HAWAIIAN ISLANDS.
ISOLATED CUMULONIMBUS...CB...PERSIST WEST OF THE ISLANDS MAINLY FROM
20N TO 24N BETWEEN 164W AND 170W.

CLOUD COVER ACROSS THE MAIN HAWAIIAN ISLANDS HAS INCREASED SINCE
THIS MORNING...MAINLY ACROSS LEEWARD AREAS. THE TYPICAL TRADE WIND
DISTRIBUTION OF GENEROUS LOW CLOUD COVER ACROSS WINDWARD AREAS
CONTINUES AS WELL. KAUAI HAS SCATTERED TO PATCHY BROKEN LOW CLOUDS
ACROSS MAUKA AREAS...WHILE OAHU HAS BROKEN LOW CLOUDS ACROSS THE
KOOLAU AND WAIANAE SUMMITS. BROKEN LOW CLOUDS COVER THE EASTERN
THIRD OF MOLOKAI...WITH THESE CLOUDS ALSO SPREADING WEST ALONG
SOUTH-FACING MOLOKAI SHORES FROM TIME TO TIME. BROKEN LOW CLOUDS
LINE SOUTH-FACING LANAI SHORES...WITH SOME OF THESE CLOUDS EXTENDING
NORTHWARD ACROSS MAUKA SECTION OF THAT ISLAND AT IRREGULAR
INTERVALS. MAUI HAS BROKEN TO OVERCAST LOW CLOUDS ACROSS ALL
HALEAKALA SLOPES AND ACROSS THE WESTERN MOUNTAINS. OVERCAST LOW
CLOUDS COVER BIG ISLAND WINDWARD SHORES AND SLOPES FROM LAUPAHOEHOE
SOUTHWARD. ALL KAU AND KONA SLOPES SOUTH OF KAILUA-KONA HAVE BROKEN
TO OVERCAST LOW CLOUDS. SATELLITE LOOP SHOWS LOW CLOUDS ARE MOVING
WESTWARD ACROSS LOCAL HAWAIIAN WATERS AT ABOUT 20 MPH.

$$
POWELL