Alert archive / Hawaii / Flash Flood Warnings in 2008

Flash Flood Warning 21, NWS Honolulu, HI

November 18, 2008Kalawao County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Nov 18, 2008, 8:31 AM HST for Kalawao 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 outline as issued.

The facts

Issued: Nov 18, 2008, 8:31 AM HST (18:31 UTC)
Expired: Nov 18, 2008, 11:17 AM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Kalawao County, HI

The nearest sounding before it

Lihue, (PHLI), launched 12:00Z, 6.5 hours before the alert went out and 257 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: 671 J/kg
Mixed-layer CIN: -10 J/kg
Mixed-layer LCL: 828 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 83 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.1

Open this sounding in Storm Lab

The text

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

000
WGHW50 PHFO 181831
FFWHFO
HIC009-182130-
/O.NEW.PHFO.FF.W.0021.081118T1831Z-081118T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
831 AM HST TUE NOV 18 2008

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF MOLOKAI IN MAUI COUNTY

* UNTIL 1130 AM HST

* AT 816 AM HST...RADAR SHOWED HEAVY RAIN NEAR HOOLEHUA AND EAST 
  MOLOKAI NEAR HALAWA VALLEY. RADAR SHOWED RAIN OVER WEST MOLOKAI 
  FALLING AT A RATE OF 2 TO 4 INCHES PER HOUR. ADDITIONAL AREAS OF 
  HEAVY RAINFALL WILL REACH THE NORTH COAST OF MOLOKAI BY 900 AM HST.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MAUNALOA...KAUNAKAKAI...KALAUPAPA...KAWELA AND LOW WATER CROSSINGS 
  ALONG HIGHWAY 450.

THIS FLASH FLOOD WARNING REPLACES THE PRE-EXISTING WARNING THAT WAS
IN EFFECT FOR THE ISLAND OF MOLOKAI IN MAUI COUNTY.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS IMMINENT OR OCCURRING
IN STREAMS...ROADS AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING OR RISING WATER IN YOUR VEHICLE OR ON FOOT.
TURN AROUND...DON/T DROWN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 1130 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2123 15727 2119 15669 2108 15674 2105 15687
      2108 15735

$$
KODAMA

2 follow-up statements

000
WGHW70 PHFO 181934
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
934 AM HST TUE NOV 18 2008

HIC009-182130-
/O.CON.PHFO.FF.W.0021.000000T0000Z-081118T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOLOKAI IN MAUI COUNTY-
934 AM HST TUE NOV 18 2008

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF MOLOKAI
IN MAUI COUNTY UNTIL 1130 AM HST...

RADAR DATA SHOWED HEAVY RAIN OVER EAST MOLOKAI FROM KALAUPAPA TO 
HALAWA AT RATES OF 1 TO 2 INCHES PER HOUR AND ADDITIONAL HEAVY RAIN 
JUST NORTHEAST OF HOOLEHUA AND KALAUPAPA WITH RATES OF 2 TO 4 INCHES 
PER HOUR.  

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO MAUNALOA...
KUALAPUU...KAUNAKAKAI...KALAUPAPA...HOOLEHUA...KALAUPAPA...KAWELA 
AND LOW WATER CROSSINGS ALONG HIGHWAY 450.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS IMMINENT OR OCCURRING
IN STREAMS...ROADS AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

DO NOT CROSS FAST FLOWING OR RISING WATER IN YOUR VEHICLE OR ON FOOT.
TURN AROUND...DON/T DROWN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 1130 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2123 15727 2119 15669 2108 15674 2105 15687
      2108 15735

$$
KODAMA

000
WGHW70 PHFO 182117
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1117 AM HST TUE NOV 18 2008

HIC009-182126-
/O.CAN.PHFO.FF.W.0021.000000T0000Z-081118T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MOLOKAI IN MAUI COUNTY-
1117 AM HST TUE NOV 18 2008

...THE FLASH FLOOD WARNING IS CANCELLED FOR THE ISLAND OF MOLOKAI IN
MAUI COUNTY...

THE HEAVY RAINS AND FLOODING HAVE SUBSIDED...BUT RUNOFF IS STILL
OCCURRING AND STREAMS WILL REMAIN HIGH FOR SEVERAL HOURS.

LAT...LON 2123 15727 2119 15669 2108 15674 2105 15687
      2108 15735

$$
KODAMA

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 18, 6:55 AM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Nov 18, 7:28 AM HST	Areal Flood Advisory	HFO	Kalawao	4 hr
Nov 18, 11:15 AM HST	Areal Flood Advisory	HFO	Hawaii	118 min

Nearby

Flash Flood Warnings in Hawaii, 2008 Every flash flood warning in 2008

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.