Alert archive / Hawaii / Flash Flood Warnings in 2012

Flash Flood Warning 5, NWS Honolulu, HI

March 4, 2012Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Mar 4, 2012, 12:12 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 outline as issued.

The facts

Issued
Mar 4, 2012, 12:12 AM HST (10:12 UTC)
Expired
Mar 4, 2012, 2:47 AM 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), 89 km from the middle of the area, began a volume at 10:14 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, 10.2 hours before the alert went out and 156 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-pSkew-T log-p diagram, Lihue, at 00:00Z on 2012-03-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1525 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lihue, at 00:00Z on 2012-03-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1525 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
498 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
26 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.

291 
WGHW50 PHFO 041012
FFWHFO
HIC003-041315-
/O.NEW.PHFO.FF.W.0005.120304T1012Z-120304T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
1212 AM 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 315 AM HST

* AT 1206 AM HST...PUNALUU STREAM GAGE SHOWED A RAPID RISE IN WATER 
  LEVEL FROM RUNOFF OF HEAVY RAIN OVER THE KOOLAU MOUNTAIN...OR 
  ABOUT 15 MILES NORTH OF HONOLULU. THE AREA OF HEAVY RAIN WAS 
  NEARLY STATIONARY.

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

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.

RUNOFF FROM THIS STORM MAY ALSO CAUSE ROCK AND MUDSLIDES IN STEEP
TERRAIN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 315 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2157 15798 2162 15788 2151 15782 2148 15793

$$

HUI/HOUSTON
2 follow-up statements
246 
WGHW70 PHFO 041128
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
128 AM HST SUN MAR 4 2012

HIC003-041315-
/O.CON.PHFO.FF.W.0005.000000T0000Z-120304T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
128 AM HST SUN MAR 4 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 315 AM HST...

RADAR CONTINUES TO SHOW MODERATE TO HEAVY RAINFALL OCCURRING OVER 
THE KOOLAU MOUNTAINS JUST UPSLOPE FROM THE PUNALUU STREAM. AS A 
RESULT...THE PUNALUU STREAM GAGE CONTINUES TO SHOW HIGHER THAN 
NORMAL WATER LEVELS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PUNALUU...
HAUULA AND KAAAWA.

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.

&&

RUNOFF FROM THIS STORM MAY ALSO CAUSE ROCK AND MUDSLIDES IN STEEP
TERRAIN.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 315 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2157 15798 2162 15788 2151 15782 2148 15793

$$

HOUSTON/HUI
490 
WGHW70 PHFO 041247
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
247 AM HST SUN MAR 4 2012

HIC003-041257-
/O.CAN.PHFO.FF.W.0005.000000T0000Z-120304T1315Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
247 AM HST SUN MAR 4 2012

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

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

LAT...LON 2157 15798 2162 15788 2151 15782 2148 15793

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 3, 2:46 PM HSTAreal Flood AdvisoryHFOKauai6 hr
Mar 3, 3:12 PM HSTHigh Surf AdvisoryHFOHonolulu, Kauai, Kalawao5 days
Mar 3, 4:47 PM HSTAreal Flood AdvisoryHFOHawaii3 hr
Mar 3, 5:44 PM HSTSmall Craft AdvisoryHFO9 days
Mar 3, 8:46 PM HSTFlash Flood WarningHFOKauai12 hr
Mar 3, 11:20 PM HSTAreal Flood AdvisoryHFOHonolulu3 hr
Mar 3, 11:21 PM HSTAreal Flood AdvisoryHFOHawaii100 min
Mar 4, 5:58 AM HSTAreal Flood AdvisoryHFOHonolulu15 hr
Mar 4, 7:12 AM HSTFlash Flood WatchHFOHonolulu, Kauai, Kalawao68 hr
Mar 4, 8:49 AM HSTFlash Flood WarningHFOKauai33 hr
Mar 4, 12:14 PM HSTSpecial Marine WarningHFO2 hr
Mar 4, 1:12 PM HSTAreal Flood AdvisoryHFOKalawao3 hr
Mar 4, 1:15 PM HSTSpecial Marine WarningHFO2 hr

Nearby

Flash Flood Warnings in Hawaii, 2012Every 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.