Flash Flood Warning 63, NWS Honolulu, HI

HAWAIIAN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
400 PM HST TUE OCT 26 2004

.SYNOPSIS...
THE UPPER LOW THAT HAS BROUGHT THUNDERSTORMS TO THE ISLANDS OVER THE
LAST COUPLE OF DAYS IS WEAKENING. SHOWERS WILL REMAIN POSSIBLE OVER
THE STATE TONIGHT ALONG WITH ISOLATED THUNDERSTORMS. TRADE WINDS
ARE EXPECTED TO MOVE INTO THE AREA ON WEDNESDAY BRINGING SHOWERS TO
THE WINDWARD AND MAUKA AREAS ONCE AGAIN.
&&

.DISCUSSION...
THE UPPER LOW THAT BROUGHT THUNDERSTORMS AND HEAVY RAIN TO THE MAIN
HAWAIIAN ISLANDS THE LAST COUPLE OF DAYS CONTINUES TO WEAKEN THIS
AFTERNOON. THE CENTER HAS BECOME HARD TO FIND ON WATER VAPOR IMAGERY
AS IT HAS DEVELOPED MORE INTO AN ELONGATED TROUGH IN THE UPPER
ATMOSPHERE. SUNSHINE BROKE THROUGH THE CLOUDS ENOUGH THIS MORNING ON
OAHU TO SPARK SOME AFTERNOON THUNDERSTORMS...PARTICULARLY OVER THE
KOOLAU RANGE AND THE CENTRAL PART OF THE ISLAND.

THE FLOOD WATCH HAS BEEN EXTENDED OVERNIGHT DUE TO THUNDERSTORM
DEVELOPMENT THIS AFTERNOON...AND THE THREAT OF ADDITIONAL
THUNDERSTORMS AND SHOWERS DEVELOPING OVERNIGHT. A SHORTWAVE TO THE
WEST OF THE ISLANDS MAY MOVE IN AND AID IN THE DEVELOPMENT OF
SHOWERS AND THUNDERSTORMS TONIGHT. THIS AFTERNOON/S SOUNDINGS SHOW
-9 TEMPERATURES AT 500 MB LEVEL AT BOTH HILO AND LIHUE. SHOWERS AND
THUNDERSTORMS TONIGHT WILL NOT BE AS WIDESPREAD AS THEY HAVE BEEN
THE LAST COUPLE OF NIGHTS. HOWEVER RAINFALL AMOUNTS IN THE HEAVIER
SHOWERS AND THUNDERSTORMS COULD STILL CAUSE LOCALIZED FLOODING AND
THUS THE FLOOD WATCH WAS EXTENDED.

HEAVY RAINFALL WAS REPORTED ON THE BIG ISLAND THIS MORNING AS HEAVY
SHOWERS AND THUNDERSTORMS MOVED OVERHEAD. OVERNIGHT SNOW FELL ATOP
MAUNA KEA AND MAUNA LOA. THIS AFTERNOON THAT SNOW WAS VISIBLE ON
SATELLITE IMAGERY AS THE CLOUDS CLEARED THE BIG ISLAND.

THE MODELS CONTINUE TO BE GOOD AGREEMENT WITH THE WEATHER PATTERN
FOR THE NEXT SEVERAL DAYS. THE NORTH TO SOUTH ORIENTED TROUGH TO THE
WEST OF THE ISLANDS IS EXPECTED TO WEAKEN AS IT MOVES TO THE WEST
AWAY FROM THE ISLANDS. DURING THIS TIME THE HIGH PRESSURE RIDGE TO
THE NORTH WILL BUILD BACK IN...BRINGING TRADES BACK TO THE ISLANDS.
&&

.MARINE...
A SOUTH SWELL IS STILL ANTIPICATED TO ARRIVE ON THURSDAY WHICH COULD
BRING SURF NEAR ADVISORY LEVELS OF 8 FEET FOR THE SOUTH SHORES.
&&

.HFO WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH FOR ALL HAWAIIAN ISLANDS THROUGH 4 AM WEDNESDAY
&&

M BALLARD

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
501 PM HST TUE OCT 26 2004

..TIME...   ...EVENT...     ...CITY LOCATION...      ...LAT.LON...
..DATE...   ....MAG....     ..COUNTY LOCATION...ST.. ...SOURCE....
            ..REMARKS..

1133 AM     HEAVY RAIN       4 E HANAPEPE            21.91N 159.52W
10/26/2004  0.20 INCH        KAUAI              HI   TRAINED SPOTTER

            .20 INCHES OF RAIN IN 20 MINUTES

1200 PM     WATER SPOUT      1 SSE KAILUA            21.39N 157.73W
10/26/2004                   HONOLULU           HI   PUBLIC

            WATERSPOUT ABOUT 1 MILE OFF LANIKAI BEACH

1215 PM     FUNNEL CLOUD     1 SSE KAILUA            21.39N 157.73W
10/26/2004                   HONOLULU           HI   PUBLIC

            FUNNEL CLOUD OVER LANIKAI

0430 PM     FLOOD            KAHUKU                  21.68N 157.95W
10/26/2004                   HONOLULU           HI   PUBLIC

            6 TO 8 INCHES OF RAIN PONDED ON KAMEHAMEHA HIGHWAY.

&&