Flash Flood Warning 11, NWS Honolulu, HI

Issued

Jan 25, 2004, 7:03 PM HST (05:03 UTC)

Expired

Jan 25, 2004, 10:00 PM HST

In force

3 hr

Issued by

NWS Honolulu, HI

Area

Counties, with a storm outline in the text

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

000 
WGHW50 PHFO 260515
FFWHI 
HIZ002-260800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
703 PM HST SUN JAN 25 2004

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WINDWARD AND CENTRAL OAHU

* UNTIL 1000 PM HST

* AT 654 PM HST...RADAR INDICATED VERY HEAVY RAIN OVER WINDWARD 
  OAHU AND OVER THE KOOLAUS NEAR PEARL CITY AND WAHIAWA.  THE HEAVY 
  RAIN AREA WAS NEARLY STATIONARY.

* LOCATIONS IN THE WARNING INCLUDE WAHIAWA...MILILANI...WAIMALU... 
  HALAWA...AIEA...FORT SHAFTER...HAUULA...HONOLULU... 
  WAIKANE...KAAAWA...KAHALUU...KAHUKU...KANEOHE AND KAILUA.

THIS WARNING SUPERSEDES THE URBAN AND SMALL STREAM ADVISORY FOR OAHU.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF
STREAMS...HIGHWAYS...UNDERPASSES AND LOW LYING AREAS.

MOTORISTS SHOULD BE ALERT FOR FLOODING AND SHOULD NOT ATTEMPT TO
CROSS FAST FLOWING OR RISING WATER. MANY FLASH FLOOD DEATHS OCCUR
WHEN MOTORISTS TRY CROSSING FLOODED ROADWAYS.

ESCAPE RISING WATER BY CLIMBING DIRECTLY TO HIGHER GROUND. NEVER TRY
TO OUTRACE A FLOOD...EITHER ON FOOT OR IN YOUR VEHICLE. DO NOT CAMP
NEAR STREAMS OR OTHER AREAS SUBJECT TO FLOODING.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER LOCAL MEDIA SOURCES FOR THE
LATEST SEVERE WEATHER INFORMATION. REPORT SEVERE WEATHER TO THE
POLICE FOR IMMEDIATE RELAY TO THE NATIONAL WEATHER SERVICE.

LAT...LON 2128 15783 2130 15766 2172 15798 2155 15814
          2140 15804
$$
KODAMA AND CRAIG

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Jan 25, 5:00 PM HST, 2 hours 3 minutes earlier.

HAWAIIAN ISLANDS FORECAST DISCUSSION...DELAYED
NATIONAL WEATHER SERVICE HONOLULU
500 PM HST SUN JAN 25 2004

.SYNOPSIS...
HEAVY SHOWERS AND THUNDERSTORMS WILL CONTINUE TO SPREAD WESTWARD
OVER THE NEXT FEW HOURS. A COLD FRONT APPROACHING FROM THE WEST WILL
REACH KAUAI TONIGHT...ADDING MORE HEAVY SHOWERS AND THUNDERSTORMS TO
THE MIX. TRADE WIND WEATHER WILL RETURN NO EARLIER THAN WEDNESDAY.

&&

.DISCUSSION...
AN UPPER TROUGH WEST OF THE MAIN ISLANDS...MOISTURE MOVING WESTWARD
IN RESURGENT TRADES...AND AN APPROACHING COLD FRONT WEST OF KAUAI
ARE COMBINING TO PRODUCE A PROLIFIC RAINMAKING AND SEVERE WEATHER
EVENT THIS AFTERNOON. CONDITIONS ARE VERY UNSTABLE...THANKS TO THE
UPPER TROUGH...WITH MUCH COLDER THAN NORMAL TEMPERATURES ALOFT.

SATELLITE LOOPS CORROBORATE THE INSTABILITY NOTED IN THE SOUNDING
DATA...WITH SHOWERY LOW CLOUDS AND ISOLATED THUNDERSTORMS SLOWLY
WORKING THEIR WAY WESTWARD ACROSS LOCAL WATERS WITHIN SLUGGISH LOW
LEVEL FLOW AND ALONG A PREVIOUS OUTFLOW BOUNDARY FROM EARLIER
THUNDERSTORMS NORTHEAST OF THE STATE. A COLD FRONT APPROACHING FROM
THE NORTHWEST HAS A SECOND AREA OF HEAVY SHOWERS AND THUNDERSTORMS
WHICH WILL AFFECT THE ISLANDS LATER THIS AFTERNOON AND OVERNIGHT
TONIGHT. ANOTHER SURFACE FEATURE IS A RIDGE OF HIGH PRESSURE WHICH
EXTENDS WEST ALONG ABOUT 28N...INDUCING A STEEP ENOUGH PRESSURE
GRADIENT TO PRODUCE THE WEAK TRADES WHICH ARE BRINGING MOISTURE BACK
INTO OUR WEATHER PICTURE.

IT IS THIS COMBINATION OF INSTABILITY AND INCREASING MOISTURE THAT
WILL CONTINUE TO TRIGGER HEAVY SHOWERS AND THUNDERSTORMS ACROSS THE
MAIN ISLANDS LATER THIS AFTERNOON AND TONIGHT. A FLASH FLOOD WATCH
REMAINS IN EFFECT FOR ALL ISLANDS OVERNIGHT. NUMEROUS FLASH FLOOD
WARNINGS ARE IN EFFECT...FOR THE BIG ISLAND...MAUI AND EAST MOLOKAI
AT THIS HOUR.

BY WEDNESDAY...THE UPPER TROUGH WILL MOVE EAST OF THE BIG ISLAND AND
BEGIN TO FILL. THE SURFACE RIDGE WILL STRENGTHEN AT THE SAME
TIME...INDUCING DRIER MODERATE TRADE WIND FLOW.

&&

.SURF...
SURF HEIGHTS HAVE FALLEN BELOW ADVISORY HEIGHTS THIS AFTERNOON...SO
THE HIGH SURF ADVISORY WAS CANCELLED AT 4 PM HST.

&&

.HNL WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH......ALL HAWAIIAN ISLANDS
HIGH SURF ADVISORY.....CANCELLED AT 4 PM HST

&&

POWELL

Flash Flood Warnings in Hawaii, 2004Every flash flood warning in 2004

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.