Flash Flood Warning 47, NWS Honolulu, HI

Issued

Apr 12, 2004, 10:45 AM HST (20:45 UTC)

Expired

Apr 12, 2004, 1:45 PM HST

In force

3 hr

Issued by

NWS Honolulu, HI

Area

Counties, with a storm outline in the text

County Kauai County, HI

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 122047
FFWHI 
HIZ004-122345-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
1045 AM HST MON APR 12 2004

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTH AND EAST HAWAII INCLUDING WINDWARD KOHALA HAMAKUA HILO AND
  PUNA

* WILL LAST UNTIL 145 PM HST BUT MAY BE RENEWED THEN. 

* THE MODERATE TO HEAVY RAINS OVER ALREADY WELL SATURATED SOIL CAN
  CAUSE FLASH FLOODING. SHOWERS ARE EXPECTED TO CONTINUE THROUGH 
  THE AFTERNOON AND EVENING BUT IS EXPECTED TO EASE LATE TONIGHT.

THIS FLASH FLOOD WARNING REPLACES THE FLOOD ADVISORY THAT WAS IN
EFFECT.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS
AND COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

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. TURN AROUND...DONT
DROWN.

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 FLOODING TO THE POLICE FOR
IMMEDIATE RELAY TO THE NATIONAL WEATHER SERVICE.

LAT...LON 1982 15555 1926 15506 1960 15467 2025 15568

$$

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Apr 12, 10:00 AM HST, 45 minutes earlier.

HAWAIIAN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1000 AM HST MON APR 12 2004

.SYNOPSIS...TRADE WINDS TO STRENGTHEN LATER THIS WEEK. SHOWERS
 OVER THE WET BIG ISLAND TO EASE LATE TONIGHT.

&&

.DISCUSSION...
 SPRING IS MOST NOTABLE FOR STRONG HIGH PRESSURE REPLACING THE
 THE LOW PRESSURE STORMS OF WINTER. THIS COMING WEEK SHOULD
 SET A GOOD EXAMPLE...THE TRADE WIND GENERATING HIGH CELL WILL BE
 BUILDING TO QUITE A STRONG ONE BY THURSDAY WITH ITS STRONG WINDS
 LASTING INTO THE WEEK END.

 STATEWIDE RAINFALL WHICH HAS BEEN LARGELY WINDWARD FOCUSED HAS
 BEEN ENHANCED MAINLY OVER THE BIG ISLAND WITH THE LINGERING REMAINS
 OF A SHEARLINE. IT HAS DROPPED NEARLY TEN INCHES OF RAIN OVER THE
 LAST 24 HOURS ON LAUPAHOEHOE AND PIIHONUA ON THE WINDWARD SIDE OF
 THE BIG ISLAND. ALTHO THERE IS MINOR UPPER LEVEL TROUGHING NEAR
 THE BIG ISLAND BELIEVE MOST OF THE SHOWERS ARE DEPENDENT ON THE
 ALREADY EXISTING UPSTREAM CLOUDS. THE REMNANT CLOUD AND SHOWER
 BAND APPEARS TO BE MOVING SOUTHWARD AND COULD..REPEAT COULD..EXPOSE
 THE BIG ISLAND TO DRIER AIR LATE TONIGHT. OTHERWISE THERE IS NO
 SIGNIFICANT STABILIZING FEATURE THAT WILL END ALL SHOWER ACTIVITY...
 ONLY A TREND FOR DIMINISHING SHOWERS TOMORROW.

&&

.WATCHES/WARNINGS/ADVISORIES...
 SMALL CRAFT ADVISORY...AROUND MAUI AND BIG ISLAND.

MATSUDA

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.