Alert archive / Hawaii / Flash Flood Warnings in 2011

Flash Flood Warning 17, NWS Honolulu, HI

April 6, 2011Hawaii County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Apr 6, 2011, 4:20 PM HST for Hawaii County, Hawaii. It was in force for 89 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 6, 2011, 4:20 PM HST (02:20 UTC)
Expired: Apr 6, 2011, 5:49 PM HST
In force: 89 min
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Hawaii County, HI

The radar

The Kamuela/Kohala Apt radar (PHKM), 44 km from the middle of the area, began a volume at 02:24 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

Hilo, (PITO), launched 00:00Z, 2.3 hours before the alert went out and 93 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: 461 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 885 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: -48 m²/s²
0-3 km storm-relative helicity: 9 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.

762 
WGHW50 PHFO 070220
FFWHFO
HIC001-070515-
/O.NEW.PHFO.FF.W.0017.110407T0220Z-110407T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
420 PM HST WED APR 6 2011

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 715 PM HST

* AT 410 PM HST...RADAR SHOWED HEAVY RAIN OVER SOUTH KONA NEAR 
  KEALAKEKUA. HEAVY RAINFALL HAS BEEN MOVING SLOWLY NORTHWARD. 
  RUNOFF FROM EARLIER RAINFALL OVER SOUTH KOHALA HAS CLOSED HIGHWAY 
  190 ABOUT 1 MILE SOUTH OF THE WAIKOLOA VILLAGE JUNCTION.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KAILUA-KONA...HONAUNAU...WAIKOLOA...SADDLE ROAD JUNCTION...
  PUUANAHULU...PUAKO AND HOLUALOA.

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 HAWAII IN HAWAII COUNTY.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 715 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 1975 15607 1992 15590 2003 15582 2002 15566
      1937 15579 1938 15591

$$


KODAMA

1 follow-up statement

802 
WGHW70 PHFO 070349
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
549 PM HST WED APR 6 2011

HIC001-070357-
/O.CAN.PHFO.FF.W.0017.000000T0000Z-110407T0515Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HAWAII IN HAWAII COUNTY-
549 PM HST WED APR 6 2011

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

WEATHER RADAR AND RAIN GAGES SHOWED THAT THE HEAVY RAINS HAVE ENDED.

A FLASH FLOOD WATCH FOR HAWAII COUNTY REMAINS IN EFFECT THROUGH LATE 
THURSDAY NIGHT.

LAT...LON 1975 15607 1992 15590 2003 15582 2002 15566
      1937 15579 1938 15591

$$

KODAMA

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 6, 2:53 PM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Apr 6, 3:27 PM HST	High Surf Advisory	HFO	Honolulu, Kalawao	48 hr
Apr 6, 3:54 PM HST	Winter Storm Warning	HFO	Hawaii	60 hr
Apr 6, 4:06 PM HST	Special Marine Warning	HFO		54 min
Apr 6, 4:49 PM HST	Areal Flood Advisory	HFO	Kalawao	37 min
Apr 6, 4:52 PM HST	Areal Flood Advisory	HFO	Kauai	54 min
Apr 6, 5:42 PM HST	Special Marine Warning	HFO		39 min
Apr 6, 6:44 PM HST	Special Marine Warning	HFO		61 min
Apr 6, 7:43 PM HST	Special Marine Warning	HFO		32 min
Apr 6, 8:39 PM HST	Special Marine Warning	HFO		51 min
Apr 6, 10:55 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Apr 6, 11:14 PM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Apr 7, 12:19 AM HST	Areal Flood Advisory	HFO	Hawaii	58 min
Apr 7, 2:18 AM HST	Areal Flood Advisory	HFO	Kauai	39 min
Apr 7, 8:46 AM HST	Areal Flood Advisory	HFO	Kauai	3 hr

Nearby

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