Alert archive / Hawaii / Flash Flood Warnings in 2011

Flash Flood Warning 13, NWS Honolulu, HI

February 23, 2011Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Feb 23, 2011, 5:43 PM HST for Honolulu County, Hawaii. It was in force for 59 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 23, 2011, 5:43 PM HST (03:43 UTC)
Expired: Feb 23, 2011, 6:42 PM HST
In force: 59 min
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 71 km from the middle of the area, began a volume at 03:42 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 00:00Z, 3.7 hours before the alert went out and 173 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: 1533 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 23 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

830 
WGHW50 PHFO 240343
FFWHFO
HIC003-240645-
/O.NEW.PHFO.FF.W.0013.110224T0343Z-110224T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
543 PM HST WED FEB 23 2011

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF OAHU IN HONOLULU COUNTY

* UNTIL 845 PM HST

* AT 536 PM HST...HEAVY RAIN WAS OVER WINDWARD OAHU FROM KANEOHE TO 
  MAUNAWILI. SPOTTERS REPORTED FLOODING ALONG KANEOHE BAY DRIVE. 
  THE AREA OF HEAVY RAIN WAS NEARLY STATIONARY.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KAILUA...WAIMANALO...WAIAHOLE...WAIKANE...KANEOHE...KANEOHE MARINE 
  CORPS BASE...HAWAII KAI AND KAHALUU.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 FLASH FLOOD WARNING REPLACES THE FLOOD ADVISORY THAT WAS IN
EFFECT FOR THE ISLAND OF OAHU IN HONOLULU COUNTY.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 845 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2149 15791 2156 15783 2147 15772 2131 15763
      2124 15773

$$

HARRISON

1 follow-up statement

339 
WGHW70 PHFO 240442
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
642 PM HST WED FEB 23 2011

HIC003-240452-
/O.CAN.PHFO.FF.W.0013.000000T0000Z-110224T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OAHU IN HONOLULU COUNTY-
642 PM HST WED FEB 23 2011

...THE FLASH FLOOD WARNING IS CANCELLED FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY...

WEATHER RADAR SHOWED THAT HEAVY RAINFALL HAS MOVED OFFSHORE. THUS THE
FLASH FLOOD WARNING IS CANCELLED.

A FLASH FLOOD WATCH REMAINS IN EFFECT.

LAT...LON 2149 15791 2156 15783 2147 15772 2131 15763
      2124 15773

$$

MORRISON

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 23, 3:36 PM HST	Areal Flood Advisory	HFO	Honolulu	114 min
Feb 23, 4:20 PM HST	Areal Flood Advisory	HFO	Kalawao	115 min
Feb 23, 5:08 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Feb 23, 5:19 PM HST	Areal Flood Advisory	HFO	Honolulu	2 hr
Feb 23, 7:44 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Feb 23, 8:54 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Feb 23, 9:56 PM HST	Flash Flood Warning	HFO	Kalawao	71 min
Feb 23, 10:28 PM HST	Areal Flood Advisory	HFO	Honolulu	92 min
Feb 23, 11:23 PM HST	Areal Flood Advisory	HFO	Kauai	4 hr
Feb 24, 5:01 AM HST	Special Marine Warning	HFO		59 min
Feb 24, 6:11 AM HST	Areal Flood Advisory	HFO	Hawaii	3 hr

Nearby

Flash Flood Warnings in Hawaii, 2011 Every flash flood warning in 2011

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.