Alert archive / Hawaii / Flash Flood Warnings in 2012

Flash Flood Warning 7, NWS Honolulu, HI

March 4, 2012Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Mar 4, 2012, 6:10 PM 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 outline as issued.

The facts

Issued: Mar 4, 2012, 6:10 PM HST (04:10 UTC)
Expired: Mar 4, 2012, 8:43 PM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 87 km from the middle of the area, began a volume at 04:13 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, 4.2 hours before the alert went out and 158 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: 526 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 554 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

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

948 
WGHW50 PHFO 050410
FFWHFO
HIC003-050715-
/O.NEW.PHFO.FF.W.0007.120305T0410Z-120305T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
610 PM HST SUN MAR 4 2012

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 915 PM HST

* AT 606 PM HST...RADAR SHOWED HEAVY RAIN NEAR PUNALUU...OR ABOUT 16
  MILES NORTH OF HONOLULU. THE AREA OF HEAVY RAIN WAS NEARLY
  STATIONARY. THE STREAM GAGE AT PUNALUU SHOWS THAT IT WILL RISE
  ABOVE FLOOD STAGE.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAUULA.

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 915 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2157 15796 2161 15791 2154 15784 2144 15783
      2146 15791

$$
LAU

1 follow-up statement

830 
WGHW70 PHFO 050643
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
843 PM HST SUN MAR 4 2012

HIC003-050652-
/O.CAN.PHFO.FF.W.0007.000000T0000Z-120305T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
843 PM HST SUN MAR 4 2012

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

WEATHER RADAR AND RAIN GAGES SHOWED THAT THE HEAVY RAINS HAVE ABATED.
THUS THE FLASH FLOOD WARNING IS CANCELLED.

LAT...LON 2157 15796 2161 15791 2154 15784 2144 15783
      2146 15791

$$

LAU

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 4, 2:38 PM HST	Special Marine Warning	HFO		112 min
Mar 4, 2:58 PM HST	Wind Advisory	HFO	Hawaii, Kauai, Kalawao	3 days
Mar 4, 3:05 PM HST	High Surf Warning	HFO	Honolulu, Kalawao	66 hr
Mar 4, 8:48 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Mar 4, 11:34 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Mar 5, 2:25 AM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Mar 5, 3:27 AM HST	Flash Flood Warning	HFO	Honolulu	8 hr
Mar 5, 9:25 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Mar 5, 9:32 AM HST	Special Marine Warning	HFO		118 min
Mar 5, 9:44 AM HST	Areal Flood Advisory	HFO	Kalawao	6 hr
Mar 5, 10:16 AM HST	Special Marine Warning	HFO		119 min
Mar 5, 11:27 AM HST	Special Marine Warning	HFO		2 hr
Mar 5, 11:33 AM HST	Special Marine Warning	HFO		117 min
Mar 5, 11:58 AM HST	Special Marine Warning	HFO		32 min
Mar 5, 1:00 PM HST	Gale Warning	HFO		15 hr
Mar 5, 1:27 PM HST	Special Marine Warning	HFO		73 min

Nearby

Flash Flood Warnings in Hawaii, 2012 Every flash flood warning in 2012

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.