Alert archive / Hawaii / Flash Flood Warnings in 2005

Flash Flood Warning 44, NWS Honolulu, HI

November 30, 2005Hawaii County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Nov 30, 2005, 7:30 PM HST for Hawaii County, Hawaii. It was in force for 2 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
Nov 30, 2005, 7:30 PM HST (05:30 UTC)
Expired
Nov 30, 2005, 9:30 PM HST
In force
2 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, 5.5 hours before the alert went out and 85 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, Hilo, at 00:00Z on 2005-12-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 766 joules per kilogram.LCLLFCEL10008507005003002001001 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, Hilo, at 00:00Z on 2005-12-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
766 J/kg
Mixed-layer CIN
-12 J/kg
Mixed-layer LCL
894 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
32 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.6

Open this sounding in Storm Lab

The text

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

000
WGHW50 PHFO 010531
FFWHFO
HIC001-010730-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
730 PM HST WED NOV 30 2005

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 930 PM HST

* AT 725 PM HST...RADAR SHOWED HEAVY RAIN OVER THE KAU COAST OF THE 
  BIG ISLAND BETWEEN WOOD VALLEY AND NAALEHU.

* OTHER LOCATIONS IN THE WARNED AREA INCLUDE KAWA FLATS... 
  PAHALA...HONUAPU...AND NINOLE.

MOVE TO HIGHER GROUND NOW. STAY AWAY FROM STREAMS AND LOW LYING AREAS
PRONE TO FLOODING.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS
AND COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

BE ESPECIALLY CAUTIOUS SINCE IT IS HARDER TO SEE FLASH FLOODING IN
THE DARK. AVOID TRAVEL ALONG THE HAWAII BELT ROAD BETWEEN PAHALA AND 
NAALEHU.

DO NOT TRY TO CROSS FAST FLOWING OR RISING WATER IN YOUR VEHICLE OR
ON FOOT. THE WATER MAY BE TOO DEEP TO CROSS SAFELY. TURN AROUND...
DON/T DROWN.

REPORT FLOODING TO POLICE OR CIVIL DEFENSE OFFICIALS FOR RELAY TO THE
NATIONAL WEATHER SERVICE.

THIS FLASH FLOOD WARNING MAY NEED TO BE EXTENDED BEYOND 930 PM HST IF
FLASH FLOODING CONDITIONS PERSIST.

LAT...LON 1899 15563 1927 15538 1936 15549 1916 15562

$$
1 follow-up statement
000
WGHW70 PHFO 010714
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
915 PM HST WED NOV 30 2005

HIC001-010718-
HAWAII-
915 PM HST WED NOV 30 2005

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

THE THUNDERSTORMS OVER SOUTHEAST PARTS OF THE BIG ISLAND HAVE 
DIMINISHED.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER LOCAL MEDIA SOURCES FOR THE
LATEST SEVERE WEATHER INFORMATION. REPORT FLOODING TO THE POLICE OR
CIVIL DEFENSE OFFICIALS FOR RELAY TO THE NATIONAL WEATHER SERVICE.

LAT...LON 1899 15563 1927 15538 1936 15549 1916 15562

$$

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 Nov 30, 6:10 PM HST, 1 hour 20 minutes earlier.

Area forecast discussion, Nov 30, 6:10 PM HST, 1 hour 20 minutes before
HAWAIIAN ISLANDS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
610 PM HST WED NOV 30 2005

.SYNOPSIS...
A RIDGE WILL REMAIN NEARLY STATIONARY OVER THE MAIN HAWAIIAN ISLANDS
FOR THE REST OF THIS WEEK...KEEPING WINDS LIGHT AND VARIABLE.
DAYTIME SEA BREEZES AND NIGHTTIME LAND BREEZES WILL DOMINATE THE
LOCAL WIND PATTERN. CLOUDS AND SHOWERS WILL FAVOR THE INTERIOR
SECTIONS OF THE ISLANDS DURING THE AFTERNOON...WITH MOSTLY CLEAR AND
COOL NIGHTS. A FRONT MAY ARRIVE LATE SUNDAY AND BRING INCREASED
SHOWERS OVER THE ISLANDS TO START NEXT WEEK.

&&

.UPDATE...
A GRAVITY WAVE MOVING NORTHWEST TO SOUTHEAST ACROSS THE STATE HAS
THROWN A MONKEY WRENCH INTO THE FORECAST FOR SOUTHEAST OAHU THIS
EVENING. TYPICAL SEA BREEZE INTERIOR SHOWERS IN OVER THE FAR
SOUTHERN END OF THE KOOLAUS ARE BEING ENHANCED BY THE GRAVITY WAVE
AT THE MOMENT. BELIEVE THE EFFECT WILL BE SHORT LIVED AS THE GRAVITY
WAVE EXITS THE AREA.  THE SHOWERS SHOULD START TO DISSIPATE WITHIN
THE NEXT HOUR. HAVE UPDATED THE ZONES TO TAKE THE INCREASED SHOWERS
INTO AFFECT THROUGH THE EARLY EVENING. WILL LEAVE INTACT THE
REMAINDER OF THE OVERNIGHT FORECAST THAT CALLS FOR A TRANSITION
TOWARD MOSTLY CLEAR SKIES LATER THIS EVENING.

&&

.DISCUSSION...
A FAIRLY BENIGN WEATHER DAY ACROSS THE STATE TODAY SAVE FOR A FUNNEL
CLOUD SPOTTED BY A PILOT OVER THE KAIWI CHANNEL. OTHER THAN
THAT...PARTLY CLOUDY SKIES AND A FEW SPRINKLES PREVAIL ACROSS THE
ISLAND CHAIN. WITH LOSS OF SURFACE HEATING OVER THE NEXT COUPLE OF
HOURS...EXPECT A TRANSITION THIS EVENING TOWARD A MOSTLY CLEAR AND
COOL NIGHT ACROSS THE STATE.

WITH RIDGE REMAINING OVER THE STATE THROUGH SATURDAY OR SO...EXPECT
BASIC REPEAT OF TODAYS WEATHER PATTERN THURSDAY THROUGH SATURDAY.
LARGE SCALE WINDS WILL REMAIN LIGHT...ALLOWING THE DEVELOPMENT OF
DAYTIME SEA BREEZES AND NIGHTTIME LAND BREEZES THROUGH SATURDAY.

A WEAK FRONT NEARLY 550 MILES NORTHWEST OF KAUAI WILL APPROACH...BUT
IS NOT EXPECTED TO REACH THE ISLANDS AT THE END OF THE WEEK.
INSTEAD...THE FRONT SHOULD STRETCH OUT AND PASS BY NORTH OF THE
ISLANDS AS IT DISSIPATES. MAY SEE AN INCREASE IN HIGH CLOUDS ACROSS
THE NORTHERN HALF OF THE STATE AS THE FRONT NEARS...BUT LITTLE TO
NONE OF THE RAIN PRODUCING STUFF.

MODELS CONTINUE TO ADVERTISE A STRONGER FRONT SWEEPING THROUGH THE
ISLANDS STARTING LATE SUNDAY. THE FORECAST UPPER LEVEL SUPPORT
APPEARS ADEQUATE...THOUGH MODELS ARE STILL A BIT FIDGETY ON THE
TIMING DETAILS. GIVEN RECENT MODEL PERFORMANCE IN A SIMILAR
SCENARIO...WILL CAUTIOUSLY KEEP TOES IN THE CURRENT FORECAST CALLING
FOR INCREASED SHOWERS...BUT DO NOT HAVE ENOUGH CONFIDENCE THIS FAR
OUT TO JUMP IN ALL THE WAY.

&&

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

&&

TANABE

In the hours before

Local storm report, Nov 30, 7:19 PM HST, 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HONOLULU HI
719 PM HST WED NOV 30 2005

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0710 PM     LIGHTNING        KAILUA                  21.40N 157.74W
11/30/2005                   HONOLULU           HI   NWS EMPLOYEE

            THUNDER HEARD IN THE DISTANCE. NO RAIN OCCURRING AT THE
            TIME OF CALL.

0712 PM     LIGHTNING        KANEOHE                 21.41N 157.79W
11/30/2005                   HONOLULU           HI   TRAINED SPOTTER

            1 FLASH OF LIGHTNING REPORTED OVER KANEOHE WITH CB TOPS.

&&

BBINGAMAN

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 30, 6:40 PM HSTFlash Flood WarningHFOHawaii65 min
Nov 30, 6:50 PM HSTFlash Flood WarningHFOHonolulu115 min

Nearby

Flash Flood Warnings in Hawaii, 2005Every 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.