Alert archive / Hawaii / Flash Flood Warnings in 2011

Flash Flood Warning 2, NWS Honolulu, HI

January 12, 2011Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jan 12, 2011, 4:58 AM HST for Honolulu County, Hawaii. It was in force for 3 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Jan 12, 2011, 4:58 AM HST (14:58 UTC)
Expired
Jan 12, 2011, 8:00 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 15:00 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.

What was reported inside it

TimeReportWhereRemark
Jan 12, 6:34 AM HSTFLASH FLOODAiea, HIFLASH FLOODING ON NALOPAKA PLACE...FIRE OFFICIAL REPORT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Lihue, (PHLI), launched 12:00Z, 3.0 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 12:00Z on 2011-01-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-01-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1379 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
191 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

478 
WGHW50 PHFO 121458
FFWHFO
HIC003-121800-
/O.NEW.PHFO.FF.W.0002.110112T1458Z-110112T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
458 AM HST WED JAN 12 2011

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 800 AM HST

* AT 448 AM HST...RADAR SHOWED HEAVY RAIN ALONG A LINE EXTENDING FROM
  12 MILES SOUTHEAST OF HONOLULU TO BARBERS POINT TO 12 MILES 
  SOUTHWEST OF KAENA POINT...MOVING NORTH AT 20 MPH.

* THIS WARNING INCLUDES THE ENTIRE ISLAND OF OAHU.

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 800 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2107 15791 2148 15852 2191 15810 2137 15753

$$
BRENCHLEY
1 follow-up statement
018 
WGHW70 PHFO 121752
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
752 AM HST WED JAN 12 2011

HIC003-121801-
/O.EXP.PHFO.FF.W.0002.000000T0000Z-110112T1800Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OAHU IN HONOLULU COUNTY-
752 AM HST WED JAN 12 2011

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

WEATHER RADAR SHOWED THAT HEAVY RAINFALL HAS WEAKENED AND MOVED 
OFFSHORE. THUS THE FLASH FLOOD WARNING HAS BEEN ALLOWED TO EXPIRE.

A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE STATE OF HAWAII 
THROUGH THURSDAY AFTERNOON. 

LAT...LON 2107 15791 2148 15852 2191 15810 2137 15753

$$

BRAVENDER

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 11, 3:30 PM HSTAreal Flood AdvisoryHFOHawaii6 hr
Jan 11, 3:30 PM HSTWind AdvisoryHFOHawaii, Honolulu, Kauai, Kalawao53 hr
Jan 12, 3:19 AM HSTSpecial Marine WarningHFO101 min
Jan 12, 3:31 AM HSTWinter Storm WarningHFOHawaii36 hr
Jan 12, 4:51 AM HSTSpecial Marine WarningHFO114 min
Jan 12, 5:05 AM HSTAreal Flood AdvisoryHFOKauai3 hr
Jan 12, 5:18 AM HSTAreal Flood AdvisoryHFOKalawao6 hr
Jan 12, 5:40 AM HSTAreal Flood AdvisoryHFOKalawao9 hr
Jan 12, 5:44 AM HSTAreal Flood AdvisoryHFOKalawao3 hr
Jan 12, 6:43 AM HSTSpecial Marine WarningHFO2 hr
Jan 12, 7:16 AM HSTSpecial Marine WarningHFO119 min
Jan 12, 8:24 AM HSTFlash Flood WarningHFOKalawao6 hr
Jan 12, 8:42 AM HSTSpecial Marine WarningHFO2 hr
Jan 12, 9:15 AM HSTSpecial Marine WarningHFO70 min
Jan 12, 10:10 AM HSTSpecial Marine WarningHFO95 min
Jan 12, 11:20 AM HSTSpecial Marine WarningHFO55 min
Jan 12, 11:42 AM HSTSpecial Marine WarningHFO48 min
Jan 12, 11:49 AM HSTAreal Flood AdvisoryHFOKalawao3 hr
Jan 12, 11:53 AM HSTSevere Thunderstorm WarningHFOKalawao37 min
Jan 12, 12:19 PM HSTFlash Flood WarningHFOKalawao2 hr
Jan 12, 12:25 PM HSTSpecial Marine WarningHFO65 min
Jan 12, 12:56 PM HSTAreal Flood AdvisoryHFOHonolulu6 hr
Jan 12, 1:30 PM HSTSpecial Marine WarningHFO29 min

Nearby

Flash Flood Warnings in Hawaii, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.