Alert archive / Hawaii / Flash Flood Warnings in 2011

Flash Flood Warning 6, NWS Honolulu, HI

January 12, 2011Honolulu County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jan 12, 2011, 11:33 PM HST for Honolulu County, Hawaii. It was in force for 9 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, 11:33 PM HST (09:33 UTC)
Expired: Jan 13, 2011, 8:30 AM HST
In force: 9 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Honolulu County, HI

The radar

The Molokai radar (PHMO), 95 km from the middle of the area, began a volume at 09:36 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

Time	Report	Where	Remark
Jan 13, 1:29 AM HST	FLASH FLOOD	Waianae, HI	FLASH FLOODING CAUSED SEWAGE SPILL IN WAIANAE.

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 00:00Z, 9.6 hours before the alert went out and 148 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: 1297 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 763 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.5

Open this sounding in Storm Lab

The text

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

197 
WGHW50 PHFO 130933
FFWHFO
HIC003-131230-
/O.NEW.PHFO.FF.W.0006.110113T0933Z-110113T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
1133 PM 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 230 AM HST

* AT 1121 PM HST...RADAR SHOWED VERY HEAVY RAIN OVER OAHU ALONG A 
  BAND FROM EWA TO KANEOHE.  THE AREA OF RAINFALL IS MOVING SLOWLY 
  TOWARD THE SOUTHEAST AND WILL BEGIN TO AFFECT EAST OAHU BEFORE 
  MIDNIGHT. RAINFALL INTENSITY OVER WEST AND NORTH OAHU HAS WEAKENED 
  BUT RUNOFF LEVELS REMAIN HIGH. THIS IS A VERY DANGEROUS SITUATION.

* THIS WARNING COVERS 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 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 230 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2160 15834 2176 15794 2126 15761 2125 15785
      2126 15812

$$


KODAMA

4 follow-up statements

281 
WGHW70 PHFO 131020
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
1220 AM HST THU JAN 13 2011

HIC003-131230-
/O.CON.PHFO.FF.W.0006.000000T0000Z-110113T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OAHU IN HONOLULU COUNTY-
1220 AM HST THU JAN 13 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF OAHU IN
HONOLULU COUNTY UNTIL 230 AM HST...

THE HEAVIEST RAINFALL HAS SHIFTED TO EAST OAHU AND HAS DECREASED 
SIGNIFICANTLY ELSEWHERE ON THE ISLAND.  HOWEVER...RUNOFF LEVELS 
REMAIN HIGH AND WILL REMAIN ELEVATED FOR SEVERAL HOURS.  WATER LEVEL 
GAGES ON HELEMANO STREAM AND OPAEULA STREAM WERE ABOUT 6 FEET ABOVE 
BASE FLOW LEVELS. EMERGENCY MANAGERS REPORTED THAT THE EAST-BOUND 
LANES OF FARRINGTON HIGHWAY HAVE BEEN CLOSED NEAR WAIPAHU MIDDLE 
SCHOOL DUE TO A MUDSLIDE. 

THIS WARNING COVERS 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.

&&

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

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 230 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2160 15834 2176 15794 2126 15761 2125 15785
      2126 15812

$$

KODAMA

746 
WGHW50 PHFO 131223
FFWHFO
HIC003-131530-
/O.EXT.PHFO.FF.W.0006.000000T0000Z-110113T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
223 AM HST THU JAN 13 2011

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

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

* UNTIL 530 AM HST

* AT 212 AM HST...RADAR SHOWED THAT HEAVY RAIN HAS MOVED EAST OF 
  OAHU.  HOWEVER...LIGHT TO MODERATE RAINFALL CONTINUES OVER MOST 
  AREAS OF OAHU AND RUNOFF AND STREAM LEVELS WILL REMAIN HIGH FOR 
  SEVERAL MORE HOURS. KAMEHAMEHA HIGHWAY REMAINS CLOSED AT WAIKANE 
  STREAM AS WATER CONTINUES TO FLOW OUT OF BANK.  

* THIS WARNING COVERS 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 FLASH FLOOD WARNING REPLACES THE PRE-EXISTING WARNING THAT WAS
IN EFFECT FOR THE ISLAND OF OAHU IN HONOLULU COUNTY.

THIS WARNING MAY NEED TO BE EXTENDED BEYOND 530 AM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2160 15834 2176 15794 2126 15761 2125 15785
      2126 15812

$$


KODAMA

366 
WGHW50 PHFO 131529
FFWHFO
HIC003-131830-
/O.EXT.PHFO.FF.W.0006.000000T0000Z-110113T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
529 AM HST THU JAN 13 2011

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

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

* UNTIL 830 AM HST

* AT 523 AM HST...RADAR SHOWED RAIN GRADUALLY TAPERING OFF OVER 
  WESTERN OAHU...WITH MODERATE RAIN FALLING OVER THE SOUTHEASTERN 
  HALF OF THE ISLAND. OAHU DEPARTMENT OF EMERGENCY MANAGEMENT   
  REPORTS SEVERAL ROAD CLOSURES ON OAHU DUE TO FLOODING AND DEBRIS 
  ON ROADWAYS...INCLUDING KAUKONAHUA ROAD AND WEED CIRCLE ON THE 
  NORTH SHORE...AND FARRINGTON HIGHWAY IN NANAKULI. 

* LOCATIONS IN THE WARNING INCLUDE ALL OF OAHU...AS RUNOFF REMAINS 
  HIGH DUE TO OVERNIGHT RAINS. 

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 830 AM HST IF FLOODING 
PERSISTS.

LAT...LON 2160 15834 2176 15794 2126 15761 2125 15785
      2126 15812

$$

BIRCHARD

704 
WGHW70 PHFO 131830
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
830 AM HST THU JAN 13 2011

HIC003-131839-
/O.EXP.PHFO.FF.W.0006.000000T0000Z-110113T1830Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
OAHU IN HONOLULU COUNTY-
830 AM HST THU JAN 13 2011

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

WEATHER RADAR AND RAIN GAGES SHOWED THAT THE HEAVY RAINS HAVE ENDED.
THUS THE FLASH FLOOD WARNING IS ALLOWED TO EXPIRE. LIGHT TO MODERATE 
RAIN WILL CONTINUE THROUGH THE MORNING.

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

A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE STATE OF HAWAII 
TODAY.

LAT...LON 2160 15834 2176 15794 2126 15761 2125 15785
      2126 15812

$$

TANABE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 12, 2:22 PM HST	Areal Flood Advisory	HFO	Kalawao	6 hr
Jan 12, 3:55 PM HST	Gale Warning	HFO		12 hr
Jan 12, 3:56 PM HST	Special Marine Warning	HFO		77 min
Jan 12, 4:59 PM HST	Areal Flood Advisory	HFO	Kauai	3 hr
Jan 12, 5:39 PM HST	Special Marine Warning	HFO		111 min
Jan 12, 5:51 PM HST	Flash Flood Warning	HFO	Honolulu	6 hr
Jan 12, 6:31 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jan 12, 9:26 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jan 12, 11:28 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jan 13, 12:37 AM HST	Special Marine Warning	HFO		53 min
Jan 13, 12:45 AM HST	Severe Thunderstorm Warning	HFO	Kalawao	30 min
Jan 13, 12:54 AM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Jan 13, 1:24 AM HST	Special Marine Warning	HFO		96 min
Jan 13, 1:56 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jan 13, 2:55 AM HST	Special Marine Warning	HFO		95 min
Jan 13, 3:10 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jan 13, 3:42 AM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Jan 13, 4:11 AM HST	Areal Flood Advisory	HFO	Kauai	3 hr
Jan 13, 4:31 AM HST	Special Marine Warning	HFO		59 min
Jan 13, 5:03 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Jan 13, 5:21 AM HST	Special Marine Warning	HFO		24 min
Jan 13, 5:39 AM HST	Special Marine Warning	HFO		36 min
Jan 13, 6:02 AM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Jan 13, 7:42 AM HST	Special Marine Warning	HFO		63 min
Jan 13, 8:11 AM HST	Special Marine Warning	HFO		64 min
Jan 13, 8:37 AM HST	Areal Flood Advisory	HFO	Honolulu	6 hr
Jan 13, 8:43 AM HST	Special Marine Warning	HFO		62 min
Jan 13, 9:18 AM HST	Special Marine Warning	HFO		65 min
Jan 13, 9:39 AM HST	Small Craft Advisory	HFO		18 hr
Jan 13, 9:45 AM HST	Special Marine Warning	HFO		35 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.