Alert archive / Hawaii / Flash Flood Warnings in 2005

Flash Flood Warning 18, NWS Honolulu, HI

August 9, 2005Hawaii County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Aug 9, 2005, 5:25 PM HST for Hawaii 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: Aug 9, 2005, 5:25 PM HST (03:25 UTC)
Expired: Aug 9, 2005, 8:30 PM HST
In force: 3 hr
Issued by: NWS Honolulu, HI
Area: Counties, with a storm outline in the text

County Hawaii County, HI

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Hilo, (PITO), launched 00:00Z, 3.4 hours before the alert went out and 102 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: 602 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 623 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 71 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.

000
WGHW50 PHFO 100325
FFWHFO
HIC001-100630-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
525 PM HST TUE AUG 9 2005

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 830 PM HST

* AT 525 PM HST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAINFALL NEAR WAIAHA STREAM AND KEALAKEKUA. AUTOMATED 
  RAIN GAUGES WERE RECORDING RAINFALL RATES IN EXCESS OF 3 INCHES 
  PER HOUR.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KAILUA-KONA...KEALAKEKUA...AND WAIAHA STREAM.

MOTORISTS SHOULD BE ALERT FOR FLOODING AND SHOULD NOT ATTEMPT TO
CROSS FAST FLOWING OR RISING WATER...MANY FLASH FLOOD DEATHS OCCUR
WHEN MOTORISTS TRY CROSSING FLOODED ROADWAYS. TURN AROUND...DON/T
DROWN.

ESCAPE RISING WATER BY CLIMBING DIRECTLY TO HIGHER GROUND. NEVER TRY
TO OUTRACE A FLOOD...EITHER ON FOOT OR IN YOUR VEHICLE. DO NOT CAMP
NEAR STREAMS OR OTHER AREAS SUBJECT TO FLOODING.

LAT...LON 1938 15598 1946 15580 1973 15591 1967 15608

$$
R BALLARD

1 follow-up statement

000
WGHW70 PHFO 100608
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
807 PM HST TUE AUG 9 2005

HIC001-100617-
HAWAII-
807 PM HST TUE AUG 9 2005

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

HEAVY RAIN HAS ENDED AND FLASH FLOODING IS NO LONGER EXPECTED.

LAT...LON 1938 15598 1946 15580 1973 15591 1967 15608

$$
DONALDSON

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Honolulu, HI wrote its last area forecast discussion before this flash flood warning went out at Aug 9, 3:38 PM HST, 1 hour 47 minutes earlier.

Area forecast discussion, Aug 9, 3:38 PM HST, 1 hour 47 minutes before

HAWAIIAN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
338 PM HST TUE AUG 9 2005

.SYNOPSIS...
AN UPPER LEVEL TROUGH TO OUR NORTHWEST WILL CONTINUE TO KEEP THE
ATMOSPHERE RATHER UNSTABLE OVER THE BIG ISLAND THROUGH THE NEXT DAY
OR SO. AFTERNOON HEATING MAY SPARK SOME LOCALLY HEAVY SHOWERS OVER
THE KONA SLOPES. WINDWARD AND MAUKA SECTIONS OF ALL ISLANDS WILL
SEE LIGHTER SHOWERS...MOSTLY DURING THE NIGHTS AND EARLY MORNINGS.
MODERATE TRADES WILL WEAKEN BY THE END OF THE WORK WEEK.

&&

.DISCUSSION...
ONCE AGAIN THIS AFTERNOON WE HAVE SEEN DEEP CONVECTION AND LOCALLY
HEAVY SHOWERS BUILD UP OVER THE INTERIOR OF THE BIG ISLAND. THE 00Z
HILO SOUNDING DEFINITELY TELLS THE STORY WITH A DEEP MOIST LAYER
EXTENDING TO 700 MB...NO CONVECTIVE CAP...WITH A PRECIPITABLE WATER
OF 1.77 INCHES AND A CAPE OF 1165 J/KG. THE LOSS OF DAYTIME HEATING
WILL LEAD TO A GRADUAL DEMISE OF THE SHOWERS THERE THIS EVENING.
VISIBLE SATELLITE IMAGERY SHOWS THAT OTHERWISE...IT IS QUIET
UPSTREAM FROM THE ISLANDS AND IT SHOULD BE A RATHER DRY NIGHT FOR
MOST AREAS.

THE WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL TROUGH ORIENTED WSW TO
ENE TO THE NORTH OF THE MAIN HAWAIIAN ISLANDS. THE SUBTROPICAL JET
EXTENDS ACROSS THE ISLANDS ON THE SOUTH SIDE OF THE UPPER TROUGH.
THESE FEATURES HAVE BEEN HELPING TO MAKE THE ATMOSPHERE MORE
UNSTABLE THAN USUAL OVER THE ISLANDS...AND THE DIMINISHING MOISTURE
THAT WAS ON THE PERIPHERY OF EX-TD 01C HAS BEEN FUEL FOR THE
CONVECTION OVER THE BIG ISLAND.

EXPECTING TO SEE A WEAKER CONVECTIVE PATTERN WEDNESDAY AND THURSDAY
AFTERNOONS AS THE FEATURES CURRENTLY IN CONTROL OF OUR WEATHER
SLOWLY GIVE WAY TO MORE A MORE SETTLED PATTERN. MODELS ARE IN
EXCELLENT AGREEMENT...AND THEY SHOW THE UPPER TROUGH NEAR THE
ISLANDS WEAKENING AND LIFTING OUT...AND UPPER RIDGING DEVELOPING
EAST OF THE ISLANDS BUILDING WESTWARD AND NORTHWARD...GENERALLY
TOWARD THE ISLANDS. FORECAST SOUNDINGS SHOW THE TRADE WIND INVERSION
REDEVELOPING. THE SUBTROPICAL RIDGE WELL TO THE NORTH GRADUALLY WILL
PUSH SOUTH...AND THE LOW LEVELS DRY OUT QUITE A BIT. WE MAY SEE
TRADE WIND MOISTURE INCREASE AGAIN EARLY NEXT WEEK.

WE HAVE TRENDED THE GRIDS DRIER WITH BELOW CLIMO RAIN CHANCES AND
MORE SUNSHINE LATE IN THE WORK WEEK AND INTO THE NEXT WEEKEND. OUR
CURRENT MODERATE TRADES WILL LIKELY DROP OFF A BIT TOWARD THE
WEEKEND...WITH LIGHT WINDS EXPECTED AT NIGHT. HOPEFULLY THE RECENT
RAINS ON THE BIG ISLAND...ALONG WITH WHATEVER FALLS THE NEXT COUPLE
DAYS...HAVE BEEN ENOUGH TO ADDRESS WILDFIRE CONCERNS.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
NONE.

&&

R BALLARD

Nearby

Flash Flood Warnings in Hawaii, 2005 Every flash flood warning in 2005

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.