Alert archive / Hawaii / Flash Flood Warnings in 2002

Flash Flood Warning 24, NWS Honolulu, HI

January 29, 2002Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jan 29, 2002, 9:15 AM HST for Honolulu County, Hawaii. 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: Jan 29, 2002, 9:15 AM HST (19:15 UTC)
Expired: Jan 29, 2002, 12:15 PM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Whole counties

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 88 km from the middle of the area, began a volume at 19:16 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Lihue, (PHLI), launched 12:00Z, 7.3 hours before the alert went out and 155 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 147 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1067 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 12 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
WGHW50 PHFO 291918
FFWHI 
HIZ006-292215-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
915 AM HST TUE JAN 29 2002

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR PERSONS ON ...
  MOLOKAI AND WEST MAUI
	 
* UNTIL 1215 PM HST
	
* AT 915 AM HST...NATIONAL WEATHER SERVICE DOPPLER RADAR
  INDICATED VERY HEAVY RAIN SHOWERS AND THUNDERSTORMS MOVING 
  NORTHEASTWARD TOWARD MOLOKAI AND WEST MAUI ACCOMPANIED BY 
  TORRENTIAL RAINS AND STRONG GUSTY WINDS.

* HEAVY SHOWERS WITH EXCESSIVE RAINFALL WILL BE OVER LANAI FOR 
  THE NEXT SEVERAL HOURS.

FLASH FLOODING IS EXPECTED IN NORMALLY DRY STREAMBEDS DURING THE 
NEXT THREE HOURS. PERSONS IN LOW-LYING OR FLOOD PRONE AREAS SHOULD 
MOVE TO HIGHER GROUND.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT. 
PERSONS ON MOLOKAI AND WEST MAUI SHOULD TAKE IMMEDIATE ACTION TO 
PROTECT LIFE AND PROPERTY AND SEEK HIGHER GROUND OR REMAIN INDOORS.

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 TO CROSS FLOODED ROADWAYS. ESCAPE RISING WATER BY 
CLIMBING DIRECTLY TO HIGHER GROUND. NEVER TRY TO OUTRUN 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...LOCAL TV OR RADIO FOR FURTHER 
NATIONAL WEATHER SERVICE INFORMATION.
 
ROSENDAL      NATIONAL WEATHER SERVICE HONOLULU

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 Jan 29, 5:00 AM HST, 4 hours 15 minutes earlier.

Area forecast discussion, Jan 29, 5:00 AM HST, 4 hours 15 minutes before

NARRATIVE SYNOPTIC DISCUSSION FOR WAKE ISLAND

SATELLITE IMAGES SHOW ONLY SMALL CUMULUS AND STRATOCUMULUS ELEMENTS
UPSTREAM. THE HIGH PRESSURE RIDGE NOT FAR TO THE NORTH WILL KEEP
WAKE ISLAND RAIN-FREE WITH LOTS OF SUNSHINE TODAY AND MOSTLY CLEAR
SKIES TONIGHT. 15 KNOT TRADE WINDS SHOULD CONTINUE.  NO SIGNFICANT
SWELL IS EXPECTED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 29, 5:20 AM HST	Flash Flood Warning	HFO		3 hr
Jan 29, 8:30 AM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Jan 29, 11:45 AM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Jan 29, 12:15 PM HST	Flash Flood Warning	HFO		3 hr
Jan 29, 1:45 PM HST	Flash Flood Warning	HFO	Kauai	3 hr

Nearby

Flash Flood Warnings in Hawaii, 2002 Every flash flood warning in 2002

Sources

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; radar from the NEXRAD Level II archive.