Alert archive / Hawaii / Flash Flood Warnings in 2010

Flash Flood Warning 21, NWS Honolulu, HI

December 27, 2010Kauai County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Dec 27, 2010, 8:55 AM HST for Kauai 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
Dec 27, 2010, 8:55 AM HST (18:55 UTC)
Expired
Dec 27, 2010, 11:45 AM HST
In force
3 hr
Issued by
NWS Honolulu, HI
Area
Storm-based polygon
Flood severity
None

County Kauai County, HI

The radar

The South Kauai radar (PHKI), 31 km from the middle of the area, began a volume at 18:59 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, 6.9 hours before the alert went out and 30 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 2010-12-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1598 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lihue, at 12:00Z on 2010-12-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.193958Sfc1 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
1598 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
624 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
75 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.6

Open this sounding in Storm Lab

The text

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

024 
WGHW50 PHFO 271855
FFWHFO
HIC007-272145-
/O.NEW.PHFO.FF.W.0021.101227T1855Z-101227T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
855 AM HST MON DEC 27 2010

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE ISLAND OF KAUAI IN KAUAI COUNTY

* UNTIL 1145 AM HST

* AT 854 AM HST...RADAR INDICATED CONTINUOUS MODERATE SHOWERS OVER 
  NORTHERN KAUAI...AND THE HANALEI RIVER BRIDGE WAS CLOSED AT 8 AM 
  AND REMAINS CLOSED DUE TO FLOODING. 

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAENA...WAINIHA...NA PALI STATE PARK...KALALAU VALLEY AND
  PRINCEVILLE.

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 1145 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2220 15966 2225 15954 2224 15943 2209 15943
      2208 15961

$$

HARRISON
1 follow-up statement
884 
WGHW70 PHFO 272143
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1143 AM HST MON DEC 27 2010

HIC007-272146-
/O.EXP.PHFO.FF.W.0021.000000T0000Z-101227T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KAUAI IN KAUAI COUNTY-
1143 AM HST MON DEC 27 2010

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

KAUAI POLICE HAVE RE-OPENED THE HANALEI RIVER BRIDGE. ALSO...STREAM 
GAGES HAVE LOWERED...AND HEAVY RAINS HAVE ENDED FOR THE TIME BEING. 
THUS...THE FLASH FLOOD WARNING WILL BE ALLOWED TO EXPIRE.

A FLASH FLOOD WATCH FOR THE ISLANDS OF NIIHAU...KAUAI AND OAHU 
REMAINS IN EFFECT THROUGH TUESDAY AFTERNOON.

LAT...LON 2220 15966 2225 15954 2224 15943 2209 15943
      2208 15961

$$

HARRISON

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 27, 2:33 AM HSTSpecial Marine WarningHFO57 min
Dec 27, 3:28 AM HSTSpecial Marine WarningHFO62 min
Dec 27, 4:28 AM HSTSpecial Marine WarningHFO62 min
Dec 27, 5:19 AM HSTAreal Flood AdvisoryHFOKauai3 hr
Dec 27, 5:29 AM HSTSpecial Marine WarningHFO61 min
Dec 27, 5:58 AM HSTFlash Flood WarningHFOKauai3 hr
Dec 27, 6:21 AM HSTSpecial Marine WarningHFO54 min
Dec 27, 7:10 AM HSTSpecial Marine WarningHFO95 min
Dec 27, 8:34 AM HSTSpecial Marine WarningHFO86 min
Dec 27, 9:57 AM HSTSpecial Marine WarningHFO2 hr
Dec 27, 11:58 AM HSTSpecial Marine WarningHFO112 min
Dec 27, 1:17 PM HSTSpecial Marine WarningHFO32 min

Nearby

Flash Flood Warnings in Hawaii, 2010Every flash flood warning in 2010

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.