Alert archive / Hawaii / Flash Flood Warnings in 2012

Flash Flood Warning 10, NWS Honolulu, HI

March 6, 2012Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Mar 6, 2012, 7:53 AM HST for Honolulu County, Hawaii. It was in force for 6 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 6, 2012, 7:53 AM HST (17:53 UTC)
Expired
Mar 6, 2012, 1:45 PM HST
In force
6 hr
Issued by
NWS Honolulu, HI
Area
Storm-based polygon
Flood severity
None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 59 km from the middle of the area, began a volume at 17:57 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, 5.9 hours before the alert went out and 185 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 12:00Z on 2012-03-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 241 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 12:00Z on 2012-03-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 40 square meters per square second.19395878Sfc1 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
241 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
472 m above ground
0-6 km bulk shear
60 kt
0-1 km storm-relative helicity
40 m²/s²
0-3 km storm-relative helicity
316 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.

301 
WGHW50 PHFO 061753
FFWHFO
HIC003-062045-
/O.NEW.PHFO.FF.W.0010.120306T1753Z-120306T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
753 AM HST TUE MAR 6 2012

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 1045 AM HST

* AT 748 AM HST...RADAR SHOWED HEAVY RAIN OVER SOUTHEAST OAHU FROM 
  DIAMOND HEAD TO HAWAII KAI TO WAIMANALO.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO AINA
  HAINA...PALOLO...NIU VALLEY AND KULIOUOU.

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 1045 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2139 15774 2138 15762 2120 15762 2122 15785

$$
WROE
2 follow-up statements
458 
WGHW70 PHFO 061917
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
917 AM HST TUE MAR 6 2012

HIC003-062045-
/O.CON.PHFO.FF.W.0010.000000T0000Z-120306T2045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HONOLULU HI-
917 AM HST TUE MAR 6 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 1045 AM HST...

ANOTHER BAND OF HEAVY SHOWERS WILL MOVE OVER ALREADY SATURATED 
PORTIONS SOUTHEAST OAHU FROM 930 AM TO 1045 AM.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WAIMANALO.

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 WARNING MAY NEED TO BE EXTENDED BEYOND 1045 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2139 15774 2138 15762 2120 15762 2122 15785

$$

WROE
943 
WGHW50 PHFO 062040
FFWHFO
HIC003-062345-
/O.EXT.PHFO.FF.W.0010.000000T0000Z-120306T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
1040 AM HST TUE MAR 6 2012

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

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

* UNTIL 145 PM HST

* AT 1024 AM HST...RADAR SHOWED A BAND OF HEAVY RAIN CONTINUING TO 
  FALL OVER EAST HONOLULU FROM DIAMOND HEAD TO HAWAII KAI AND MOST 
  OF SOUTHEAST OAHU. WATER HAS BEEN REPORTED ALONG PORTIONS OF 
  KALANIANAOLE HIGHWAY IN EAST HONOLULU...WHILE A ROCK SLIDE WAS 
  REPORTED NEAR SANDY BEACH. RAIN IS FALLING ON SATURATED GROUND... 
  AND ADDITIONAL PERIODS OF HEAVY RAIN WILL LEAD TO FLOODING.

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

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 PRE-EXISTING WARNING 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 145 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2139 15774 2138 15762 2120 15762 2122 15785

$$
WROE

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 5, 3:40 PM HSTAreal Flood AdvisoryHFOKalawao6 hr
Mar 5, 4:20 PM HSTSpecial Marine WarningHFO115 min
Mar 5, 5:14 PM HSTSpecial Marine WarningHFO61 min
Mar 5, 5:36 PM HSTFlash Flood WarningHFOKauai15 hr
Mar 5, 6:41 PM HSTSpecial Marine WarningHFO94 min
Mar 5, 7:30 PM HSTAreal Flood AdvisoryHFOHonolulu8 hr
Mar 5, 7:53 PM HSTAreal Flood AdvisoryHFOKalawao3 hr
Mar 5, 7:53 PM HSTSpecial Marine WarningHFO112 min
Mar 5, 8:11 PM HSTSpecial Marine WarningHFO94 min
Mar 5, 8:46 PM HSTSevere Thunderstorm WarningHFOKalawao29 min
Mar 5, 8:51 PM HSTSpecial Marine WarningHFO114 min
Mar 5, 9:26 PM HSTSpecial Marine WarningHFO2 hr
Mar 5, 9:54 PM HSTSpecial Marine WarningHFO2 hr
Mar 5, 10:41 PM HSTSpecial Marine WarningHFO2 hr
Mar 5, 11:51 PM HSTSpecial Marine WarningHFO114 min
Mar 6, 12:58 AM HSTSpecial Marine WarningHFO2 hr
Mar 6, 1:43 AM HSTSpecial Marine WarningHFO90 min
Mar 6, 3:25 AM HSTSpecial Marine WarningHFO2 hr
Mar 6, 6:41 AM HSTAreal Flood AdvisoryHFOHonolulu3 hr
Mar 6, 6:44 AM HSTSpecial Marine WarningHFO61 min
Mar 6, 7:10 AM HSTWinter Weather AdvisoryHFOHawaii9 hr
Mar 6, 7:27 AM HSTSpecial Marine WarningHFO63 min
Mar 6, 8:18 AM HSTSpecial Marine WarningHFO57 min
Mar 6, 8:25 AM HSTFlash Flood WarningHFOKauai3 hr
Mar 6, 9:11 AM HSTSpecial Marine WarningHFO64 min
Mar 6, 9:53 AM HSTSpecial Marine WarningHFO67 min
Mar 6, 10:03 AM HSTSpecial Marine WarningHFO57 min
Mar 6, 10:21 AM HSTSpecial Marine WarningHFO27 min
Mar 6, 10:54 AM HSTSpecial Marine WarningHFO51 min
Mar 6, 11:08 AM HSTFlash Flood WarningHFOKauai5 hr
Mar 6, 11:41 AM HSTSpecial Marine WarningHFO49 min
Mar 6, 12:05 PM HSTFlash Flood WarningHFOHonolulu5 hr
Mar 6, 12:22 PM HSTSpecial Marine WarningHFO39 min
Mar 6, 1:15 PM HSTSpecial Marine WarningHFO60 min

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.