Flash Flood Warning 9, NWS Honolulu, HI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST SUN FEB 3 2008

.SYNOPSIS...
AN UPPER LEVEL LOW NORTHWEST OF KAUAI WILL KEEP THE ATMOSPHERE
UNSTABLE AND WILL MAINTAIN THE THREAT FOR HEAVY RAINFALL ACROSS THE
STATE FOR THE NEXT COUPLE OF DAYS. HIGH PRESSURE FAR NORTH OF THE
STATE WILL PRODUCE MODERATE TO FRESH TRADE WINDS ACROSS THE ISLANDS.

&&

DISCUSSION...
AN UPPER LEVEL LOW PARKED 400 MILES WEST NORTHWEST OF KAUAI IS
MAINTAINING MOIST AND UNSTABLE CONDITIONS OVER THE STATE WITH THE
THREAT OF ADDITIONAL HEAVY RAINFALL CONTINUING. THE ISLANDS LIE
UNDER A SUBTROPICAL JET STREAM ALONG THE EASTERN FLANK OF THE UPPER
LOW. THIS JET STREAM IS CURRENTLY FOCUSING THE GREATEST INSTABILITY
AND HEAVIEST RAINFALL NORTHEAST OF THE BIG ISLAND...BUT THE
POTENTIAL FOR HEAVY RAINFALL EXISTS OVER ALL ISLANDS TODAY. AN AREA
OF SCATTERED THUNDERSTORMS 125 MILES NORTHWEST OF KAUAI UNDER THE
COLD POOL ALOFT ASSOCIATED WITH THE UPPER LOW IS NOT EXPECTED TO
ADVANCE ANY CLOSER TO THE ISLANDS. HOWEVER...THE ATMOSPHERE REMAINS
COLD ENOUGH FOR ADDITIONAL SNOWFALL ACROSS THE SUMMITS OF THE BIG
ISLAND ABOVE 12 KFT TODAY...AND THE WINTER WEATHER ADVISORY WILL BE
EXTENDED TO COVER THIS.

THE UPPER LEVEL LOW WILL GRADUALLY WEAKEN INTO A TROUGH TOMORROW AS
IT MEANDERS NORTHWEST OF THE ISLANDS. DESPITE WEAKENING...THE UPPER
TROUGH WILL MAINTAIN UNSTABLE CONDITIONS AND THE THREAT OF HEAVY
RAINFALL THROUGH AT LEAST MONDAY. THIS FEATURE WILL MOVE SLOWLY
EASTWARD OVER THE STATE DURING THE MIDDLE OF THE WEEK...KEEPING THE
ATMOSPHERE SOMEWHAT UNSTABLE AND LIKELY KEEPING THE THREAT FOR HEAVY
RAINFALL OVER PORTIONS OF THE ISLAND CHAIN.

HIGH PRESSURE FAR NORTH NORTHEAST OF THE STATE WILL MAINTAIN
MODERATE TO LOCALLY FRESH TRADE WINDS THROUGH MID WEEK. THE HIGH
WILL DRIFT EASTWARD FOR THE NEXT FEW DAYS...BUT ITS ASSOCIATED RIDGE
WILL REMAIN FIRM SEVERAL HUNDRED MILES NORTH OF THE ISLANDS. A FRONT
PASSING NORTH OF THE STATE MAY WEAKEN THE RIDGE AND OUR TRADE WINDS
THURSDAY AND FRIDAY...WITH LIGHT TO MODERATE TRADES EXPECTED NEXT
WEEKEND.

&&

.MARINE...
THE MODERATE TO FRESH TRADE WINDS AND LARGE SEAS REQUIRE SMALL CRAFT
ADVISORIES FOR ALL CHANNELS AND MOST OF THE COASTAL WATERS TODAY. BY
TONIGHT...THE WINDS ARE EXPECTED TO GRADUALLY DIMINISH SO THAT ONLY
THE TYPICALLY WINDY MARINE ZONES WILL REQUIRE SMALL CRAFT ADVISORIES.

THE SIGNIFICANT WAVE HEIGHT AND DOMINANT WAVE PERIOD AT THE KAILUA
BAY BUOY ARE 10 FEET AND 10 SECONDS THIS MORNING DUE TO THE STRONG
TRADE BLOWING ACROSS THE CENTRAL PACIFIC. THE WAVEWATCH III MODEL
OUTPUT INDICATES THAT THESE LARGE AND ROUGH SEAS FROM THE EAST WILL
CONTINUE TO PRODUCE ABOVE NORMAL SURF ALONG THE AFFECTED SHORES AT
LEAST THROUGH THIS AFTERNOON. THIS HIGH SURF ADVISORY MAY NEED TO BE
EXTENDED FOR AT LEAST THROUGH TONIGHT IF THE WAVES REMAIN ELEVATED
THROUGH THE DAY.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL 200 PM HST THIS AFTERNOON FOR ALL ISLANDS.

HIGH SURF ADVISORY UNTIL 600 PM HST THIS AFTERNOON FOR EAST FACING
SHORES OF KAUAI OAHU MOLOKAI MAUI AND THE BIG ISLAND.

WINTER WEATHER ADVISORY UNTIL 600 AM HST MONDAY MORNING FOR BIG
ISLAND SUMMITS.

SMALL CRAFT ADVISORY UNTIL 600 PM HST THIS AFTERNOON FOR KAUAI
CHANNEL-OAHU WINDWARD WATERS-KAIWI CHANNEL-MAUI COUNTY WINDWARD
WATERS-BIG ISLAND LEEWARD WATERS.

SMALL CRAFT ADVISORY UNTIL 600 AM HST MONDAY FOR MAALAEA BAY-
SOUTH BIG ISLAND WATERS-PAILOLO AND ALENUIHAHA CHANNELS.

&&

WROE

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
1208 PM HST SUN FEB 03 2008

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

1105 AM     FLASH FLOOD      WAINIHA                 22.21N 159.54W
02/03/2008                   KAUAI              HI   NWS EMPLOYEE

            DCO LIHUE RELAYED REPORT FROM THE POLICE THAT THE WAINIHA
            BRIDGE IS CLOSED DUE TO FLOODING

&&

DWROE