Alert archive / Hawaii / Flash Flood Warnings in 2009

Flash Flood Warning 13, NWS Honolulu, HI

July 23, 2009Kauai County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Jul 23, 2009, 6:40 PM HST for Kauai County, Hawaii. It was in force for 30 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: Jul 23, 2009, 6:40 PM HST (04:40 UTC)
Expired: Jul 23, 2009, 7:10 PM HST
In force: 30 min
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

County Kauai County, HI

The nearest sounding before it

Lihue, (PHLI), launched 00:00Z, 4.7 hours before the alert went out and 25 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: 921 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 629 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 104 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

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

134 
WGHW50 PHFO 240440
FFWHFO
HIC007-240730-
/O.NEW.PHFO.FF.W.0013.090724T0440Z-090724T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
640 PM HST THU JUL 23 2009

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 930 PM HST

* AT 625 PM HST...RADAR SHOWED THAT HEAVY RAINFALL REMAINS NEARLY 
  STATIONARY ABOUT 50 MILES SOUTH OF KAUAI. THE HANALEI BRIDGE STILL 
  REMAINS UNDERWATER. THE HANALEI RIVER IS NOT RISING BUT STANDING 
  WATER IN THE FIELDS OF THE VALLEY IS DRAINING SLOWLY. THE 
  ATMOSPHERE REMAINS MOIST AND UNSTABLE SO THE THREAT OF HEAVY 
  SHOWERS REMAINS. 

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAENA...WAINIHA...NA PALI STATE PARK...MOLOAA...KALALAU VALLEY...
  BARKING SANDS...WAILUA...PRINCEVILLE...MANA...KOKEE STATE PARK...
  KILAUEA...KAPAA...HANALEI AND ANAHOLA.

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 930 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 2228 15970 2223 15921 2181 15929 2193 15988

$$
HOAG

1 follow-up statement

949 
WGHW70 PHFO 240510
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
710 PM HST THU JUL 23 2009

HIC007-240513-
/O.CAN.PHFO.FF.W.0013.000000T0000Z-090724T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KAUAI IN KAUAI COUNTY-
710 PM HST THU JUL 23 2009

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

THE HANALEI BRIDGE IS REPORTED TO NOW BE OPEN. THERE STILL REMAINS A 
THREAT OF HEAVY SHOWERS SINCE THE ATMOSPHERE IS MOIST AND UNSTABLE. 
WEATHER RADAR SHOWED SHOWER ACTIVITY REMAINING SOUTH OF THE ISLAND. 
THERE WAS NO SIGNIFICANT SHOWER ACTIVITY OVER THE ISLAND ITSELF 
DURING THE EARLY EVENING...CONSEQUENTLY THE FLASH FLOOD WARNING IS 
CANCELLED. 

LAT...LON 2228 15970 2223 15921 2181 15929 2193 15988

$$

HOAG

Nearby

Flash Flood Warnings in Hawaii, 2009 Every flash flood warning in 2009

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.