Alert archive / Hawaii / Flash Flood Warnings in 2003

Flash Flood Warning 7, NWS Honolulu, HI

November 29, 2003

NWS Honolulu, HI issued this flash flood warning at Nov 29, 2003, 1:25 PM HST. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Nov 29, 2003, 1:25 PM HST (23:25 UTC)
Expired: Nov 29, 2003, 4:30 PM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Whole counties

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGHW50 PHFO 292327
FFWHI 
HIZ002-300230-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
125 PM HST SAT NOV 29 2003

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST OAHU...MAINLY OVER THE KOOLAUS FROM ABOVE WAIKANE TO MANOA.

* UNTIL 430 PM HST

* AT 125 PM HST...AUTOMATED RAIN GUAGES INDICATED VERY HEAVY RAIN
  OVER THE CENTRAL AND SOUTHERN PARTS OF THE KOOLAU RANGE NEAR 
  WILSON TUNNEL. THE AREA OF HEAVY RAIN WAS NEARLY STATIONARY.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS IMMINENT OR OCCURRING. 
HEAVY RAIN IS LIKELY TO CONTINUE FOR A FEW MORE HOURS OVER THE 
SOUTHERN PART OF THE KOOLAU RANGE. HIKERS SHOULD BEWARE OF RISING 
CREEKS AND STREAMS. EXCESSIVE RUNOFF FROM THIS STORM MAY CAUSE 
FLASH FLOODING OF STREAMS...AND LOW LYING AREAS. NEVER DRIVE INTO 
AREAS WHERE WATER COVERS THE ROAD.

$$
LAT...LON 2125 15787 2131 15768 2168 15766 2154 15812

R BALLARD

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Nov 29, 9:45 AM HST, 3 hours 40 minutes earlier.

Area forecast discussion, Nov 29, 9:45 AM HST, 3 hours 40 minutes before

HAWAIIAN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
945 AM HST SAT NOV 29 2003

.SYNOPSIS...A SHEARLINE WILL PASS ACROSS THE STATE TODAY...SPREADING
CLOUDS AND SHOWERS OVER MOST SECTIONS OF THE ISLANDS. RAINFALL WILL
FAVOR WINDWARD AND MOUNTAIN AREAS AND MAY BE HEAVY AT TIMES TODAY.
GUSTY WINDS ASSOCIATED WITH SHEARLINE PASSAGE WILL DECREASE TO
MODERATE TRADES SUNDAY AND THEREAFTER.

&&

.DISCUSSION...SATELLITE AND RADAR SHOWING SHOWERS ASSOCIATED WITH
THE SHEARLINE ITSELF ARE STARTING TO AFFECT WINDWARD SHORES. THERE
ALSO HAVE BEEN SOME HEAVY SHOWERS ANCHORED OVER THE EAST END OF MAUI
SINCE YESTERDAY AFTERNOON. HAVE HAD AN URBAN AND SMALL STREAM FLOOD
ADVISORY /USSFA/ FOR THAT AREA THIS MORNING...BUT WILL PROBABLY BE
DROPPING THIS AT 10 AM AS SHOWERS HAVE DIMINISHED A BIT THERE.

THE 850 MB WINDS ARE TAKING THE SHOWERS ONTO EAST AND SOUTHEAST
FACING SECTIONS OF THE ISLANDS THIS MORNING...AND BASED ON
SATELLITE AND THE SHORT RANGE MODELS...THAT SHOULD CONTINUE THROUGH
MUCH OF THE DAY. WEST SIDES WILL BE SHIELDED SOMEWHAT...AND WILL
PROBABLY REDUCE SHOWER COVERAGE FOR SOME LEEWARD SECTIONS FOR THIS
AFTERNOON IN AN UPDATE.

FORECAST THINKING HAS NOT CHANGED OTHERWISE. THE SHEARLINE SHOULD
KEEP THE ISLANDS FAIRLY WET TONIGHT...ESPECIALLY WINDWARD AND MAUKA
SECTIONS. THE UPPER LEVELS DO NOT APPEAR TO BE QUITE AS SUPPORTIVE
FOR LOCALLY HEAVY SHOWERS AS THEY WERE YESTERDAY...BUT WITH ABUNDANT
MOISTURE AND WEAK SHORTWAVES COMING AT US FROM THE SOUTHWEST...
CANNOT RULE OUT A FEW SPOTS GETTING A GOOD DRENCHING. A GRADUAL
DECREASE IN MOISTURE IS AGREED UPON BY ALL AVAILABLE MODELS  ON
SUNDAY...SO THE FORECAST WILL CONTINUE TO TREND DRIER.

THE MAIN QUESTION IN THE LONGER RANGE CONTINUES TO BE THE PATTERN
OVER THE ISLANDS TUESDAY AND WEDNESDAY. SOME OF THE MODELS ARE
SUGGESTING AN INVERTED TROUGH OR LOW MAY DEVELOP NEAR OR JUST WEST
OF THE ISLANDS...WHILE OTHERS ARE MORE AGGRESSIVE RETURNING MODERATE
TRADES TO THE ISLANDS. WILL NOT MAKE ANY CHANGES NOW...BUT WILL
INVESTIGATE THE NEED FOR A WETTER FORECAST ON THOSE DAYS.

&&

.MARINE...SURF HEIGHTS APPEAR TO BE PEAKING AND SHOULD CONTINUE AT
CURRENT LEVELS THROUGH TODAY...THEN DIMINISHING SUNDAY. SMALL CRAFT
ADVISORY WILL CONTINUE FOR THE LARGE SWELL...AND ALSO WILL MAINTAIN
CAUTIONARY STATEMENTS BOTH FOR HARBOR SURGES ON NORTH FACING
SHORES...AND IN ANTICIPATION OF INCREASING WINDS ASSOCIATED WITH THE
SHEARLINE AND THE ENHANCED PRESSURE GRADIENT THAT WILL FOLLOW.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
HIGH SURF WARNING FOR EAST FACING SHORES.
HIGH SURF ADVISORY FOR NORTH FACING SHORES.
SMALL CRAFT ADVISORY FOR ALL HAWAIIAN WATERS

&&

R BALLARD

The office that day

Everything else NWS Honolulu, HI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 28, 9:10 PM HST	Flash Flood Warning	HFO	Kauai	3 hr

Nearby

Flash Flood Warnings in Hawaii, 2003 Every flash flood warning in 2003

Sources

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