000 
ATHW40 PHFO 200530
SIMHI 

HAWAIIAN ISLANDS SATELLITE INTERPRETATION MESSAGE
NWS CENTRAL PACIFIC HURRICANE CENTER HONOLULU HI
0530 UTC SAT NOV 20 2004

BASED ON DATA THROUGH 0500 UTC NOVEMBER 20 2004

THE MAIN CLOUD FEATURE IN THE CENTRAL NORTH PACIFIC IS A 600 MILE 
WIDE BAND OF OVERCAST LAYERED CLOUDS...MARKING THE EASTERN FLANK OF 
AN UPPER TROUGH...CENTERED ALONG AN ARC FROM 40N156W TO 33N162W TO 
28N170W. WATER VAPOR IMAGERY SHOWS THE TROUGH AXIS EXTENDS THROUGH 
50N168W AND 30N167W. THE LAYERED CLOUD BAND IS MOVING TOWARDS THE 
EAST AT ABOUT 25 MPH. THE BASE OF THIS UPPER TROUGH IS DIGGING SOUTH 
AT 15 TO 20 MPH. HIGH CLOUDS RUNNING AHEAD OF THE LEADING EDGE OF 
THE LAYERED CLOUD BAND ARE ABOUT 320 MILES NORTHWEST OF KAUAI. 

ANOTHER UPPER TROUGH HAS MOVED EAST OF THE MAIN HAWAIIAN ISLANDS. 
WITH AN AXIS WHICH EXTENDS THROUGH AN UPPER LOW NEAR 27N143W AND A 
POINT EAST OF THE BIG ISLAND NEAR 19N149W...THIS UPPER TROUGH IS 
MOVING EAST AWAY FROM THE ISLANDS AT 15 TO 20 MPH. A THIN BUT 
CONTINUOUS WISP OF BROKEN HIGH CLOUDS EXTENDING FROM 18N158W TO 
19N148W MARKS THE SOUTHERN FLANK OF THIS UPPER TROUGH. THE LEADING 
EDGE OF ANOTHER AREA OF HIGH CLOUDS ORIGINATING IN THE DEEP TROPICS 
FAR SOUTHWEST OF THE MAIN HAWAIIAN ISLANDS IS MOVING OVER THE 
ISLANDS THIS EVENING. 

HIGH CLOUDS OVER THE MAIN HAWAIIAN ISLANDS ARE THICKENING WITH EACH 
PASSING HOUR...SO THIS MAY BE THE LAST VIEW OF LOW CLOUDS FOR 
AWHILE. LAST VISIBLE IMAGERY SHOWED LOW CLOUDS MOVING TOWARDS THE 
WEST ACROSS HAWAIIAN WATERS AT ABOUT 15 MPH. WINDS HAVE VEERED FROM 
THE PREVAILING NORTHEAST DIRECTION NOTED YESTERDAY AT THIS TIME. LOW 
CLOUDS COVER THE WINDWARD TWO THIRDS OF KAUAI. OAHU HAS SCATTERED TO 
BROKEN LOW CLOUDS OVER WINDWARD AREAS AND LINGERING BROKEN TO 
OVERCAST LOW CLOUDS OVER LEEWARD AREAS. MOLOKAI HAS SCATTERED TO 
BROKEN LOW CLOUDS OVER ITS EASTERN THIRD...WHILE LANAI HAS SCATTERED 
LOW CLOUDS OVER MAUKA AREAS. BROKEN LOW CLOUDS RING HALEAKALA SLOPES 
ON MAUI...LEAVING THE SADDLE WITH ONLY SCATTERED LOW CLOUDS. MAUKA 
AREAS OF WEST MAUI HAVE LINGERING BROKEN LOW CLOUDS. BROKEN TO 
OVERCAST LOW CLOUDS COVER WINDWARD...SOUTHEAST PUNA AND KAU SHORES 
AND SLOPES OF THE BIG ISLAND THIS EVENING. SCATTERED TO BROKEN LOW 
CLOUDS LINGER OVER KONA SLOPES AS WELL...LEAVING ONLY THE LEEWARD 
KOHALA AND SUMMITS AREAS FREE OF LOW CLOUDS.  

ISOLATED TO SCATTERED CUMULONIMBUS...CB...ASSOCIATED WITH THE 
INTERTROPICAL CONVERGENCE ZONE HAVE DRIFTED NORTH OF 10N BETWEEN 
145W AND 160W OVER THE PAST 24 HOURS...LIKELY IN RESPONSE TO THE 
APPROACHING UPPER TROUGH. THESE CB POSE NO THREAT TO THE MAIN 
HAWAIIAN ISLANDS...BUT THEY WILL LIKELY SERVE AS THE SOURCE FOR HIGH 
CLOUDS EXPECTED TO MOVE OVER THE STATE OVER THE NEXT FEW DAYS. 

$$

POWELL