Alert archive / Hawaii / Flash Flood Warnings in 2007

Flash Flood Warning 20, NWS Honolulu, HI

December 5, 2007Hawaii County, Hawaii

NWS Honolulu, HI issued this flash flood warning at Dec 5, 2007, 2:52 PM HST for Hawaii County, Hawaii. It was in force for 6 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: Dec 5, 2007, 2:52 PM HST (00:52 UTC)
Expired: Dec 5, 2007, 8:45 PM HST
In force: 6 hr
Issued by: NWS Honolulu, HI
Area: Storm-based polygon
Flood severity: None

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, 0.9 hours before the alert went out and 79 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: 492 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 906 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

000
WGHW50 PHFO 060100
FFWHFO
HIC001-060345-
/O.NEW.PHFO.FF.W.0020.071206T0052Z-071206T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
252 PM HST WED DEC 5 2007

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A

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

* UNTIL 545 PM HST

* AT 246 PM HST...RADAR SHOWED HEAVY RAINS OVER THE KOHALA AREA FROM 
  HAWI TO KAWAIHAE.  ADDITIONAL RAINS ARE EXPECTED TO MOVE ONSHORE 
  FROM THE WEST WITHIN THE NEXT 2 HOURS. RAINFALL IS ALSO OCCURRING 
  OVER THE KAU DISTRICT NEAR WOOD VALLEY AND PAHALA.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAWI...KAMUELA...WAIKOLOA...KAILUA-KONA...HONAUNAU...KEALAKEKUA...
  OCEAN VIEW ESTATES...NAALEHU...PAHALA...KAWA FLATS AND WOOD VALLEY.

THIS FLASH FLOOD WARNING REPLACES THE FLOOD ADVISORY THAT WAS IN
EFFECT FOR THE ISLAND OF HAWAII IN HAWAII COUNTY.

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 545 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 1904 15590 1937 15595 1973 15610 1997 15591
      2029 15591 2026 15567 1944 15572 1955 15538
      1929 15506 1914 15541 1887 15569

$$

KODAMA

2 follow-up statements

000
WGHW70 PHFO 060217
FFSHFO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE HONOLULU HI
409 PM HST WED DEC 5 2007

HIC001-060345-
/O.CON.PHFO.FF.W.0020.000000T0000Z-071206T0345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
HAWAII IN HAWAII COUNTY-
409 PM HST WED DEC 5 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE ISLAND OF HAWAII
IN HAWAII COUNTY UNTIL 545 PM HST...

RADAR INDICATED HEAVY RAINS FROM KAHUA RANCH TO KAILUA-KONA WITH 
RAIN RATES OF 1 TO 2 INCHES PER HOUR. HEAVIEST RAINS WERE OCCURRING 
IN THE KALAOA AND KEALAKEHE AREAS AND CIVIL DEFENSE REPORTED WATER 
ON THE ROADS IN SEVERAL AREAS.

LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
HAWI...KAMUELA...WAIKOLOA...KAILUA-KONA...HONAUNAU...KEALAKEKUA...
OCEAN VIEW ESTATES...NAALEHU...PAHALA...KAWA FLATS AND WOOD VALLEY.

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 545 PM HST IF FLASH
FLOODING PERSISTS.

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

LAT...LON 1904 15590 1937 15595 1973 15610 1997 15591
      2029 15591 2026 15567 1944 15572 1955 15538
      1929 15506 1914 15541 1887 15569

$$
KODAMA

000
WGHW50 PHFO 060338
FFWHFO
HIC001-060645-
/O.EXT.PHFO.FF.W.0020.000000T0000Z-071206T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HONOLULU HI
534 PM HST WED DEC 5 2007

THE NATIONAL WEATHER SERVICE IN HONOLULU HAS EXTENDED THE

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

* UNTIL 845 PM HST

* AT 526 PM HST...RADAR SHOWED HEAVY RAINS CONTINUING OVER THE WEST 
  SIDE OF THE BIG ISLAND FROM KEAHOLE POINT TO SOUTH OF HONAUNAU.  
  THE AREA OF RAIN IS MOVING EAST AT ABOUT 10 MILES PER HOUR.  
  ADDITIONAL RAINS ARE AFFECTING THE KAU DISTRICT FROM NAALEHU TO 
  VOLCANO. HEAVY RAINS ARE EXPECTED TO CONTINUE OVER THE NEXT 
  SEVERAL HOURS.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HAWI...KAMUELA...WAIKOLOA...KAILUA-KONA...HONAUNAU...KEALAKEKUA...
  OCEAN VIEW ESTATES...NAALEHU...PAHALA...KAWA FLATS AND WOOD VALLEY.

THIS FLASH FLOOD WARNING REPLACES THE PRE-EXISTING WARNING THAT WAS
IN EFFECT FOR THE ISLAND OF HAWAII IN HAWAII COUNTY.

A FLASH FLOOD WARNING MEANS FLASH FLOODING IS IMMINENT OR OCCURRING
IN STREAMS...ROADS AND LOW LYING AREAS. MOVE TO HIGHER GROUND NOW.

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

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 845 PM HST IF FLASH
FLOODING PERSISTS.

LAT...LON 1904 15590 1937 15595 1973 15610 1997 15591
      2029 15591 2026 15567 1944 15572 1955 15538
      1929 15506 1914 15541 1887 15569

$$
KODAMA

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 Dec 5, 10:55 AM HST, 3 hours 57 minutes earlier.

Area forecast discussion, Dec 5, 10:55 AM HST, 3 hours 57 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HONOLULU HI
1055 AM HST WED DEC 5 2007

.SYNOPSIS...THE HEAVY WINDS AND RAINS HAVE MOVED OVER MAUI AND
 WILL BE NUDGING ITS WAY TO THE BIG ISLAND TONIGHT. FRESH
 FAIR WEATHER TRADE WINDS TO RETURN MONDAY.

&&

.DISCUSSION...THE GALE FORCE LOW IS NOW STATIONARY SOME 225 MILES
 NORTH OF KAUAI. ITS FRONT WHICH PASSED THRU KAUAI LAST NIGHT AND
 OAHU EARLY THIS MORNING IS NOW OVER MAUI. ITS PROGRESS IS EXPECTED
 TO SLOW AND REACH THE BIG ISLAND TONIGHT AND STALL THERE. THE GFS
 MODEL NOW WEAKENS THE LOW BEGINNING TOMORROW AND BEGINS MOVING IT
 OFF TO THE NORTH FRIDAY. WHILE THE LOW OR ITS SUPPORTING UPPER
 TROUGH REMAINS NEAR THE ISLANDS KAUAI OAHU AND MOLOKAI WHICH HAVE
 ALREADY LIKELY SEEN THEIR WORST MAY STILL HAVE A FEW MORE BUT NOT
 AS STRONG SHOWERS AND WINDS. MORE DETERMINED IMPROVEMENT IS
 EXPECTED AFTER THE WEEKEND AS FRESH TRADE WINDS RETURN ON MONDAY.

&&

.MARINE...BOTH INCOMING LARGE NORTHWEST SWELLS AND STRONG SOUTHWEST
 LOCAL WINDS WILL CONTINUE TO CAUSE ROUGH ADVISORY LEVEL SURF
 CONDITIONS ON MOST SHORES.

&&

.HFO WATCHES/WARNINGS/ADVISORIES...
 HIGH WIND WARNING...ALL ISLANDS TIL 6 PM
 FLASH FLOOD WATCH...ALL ISLANDS
 HIGH SURF WARNING....KAUAI NORTH AND WEST SHORES TIL 6 PM
 HIGH SURF ADVISORY...MOST OTHER SHORES TIL 6 PM
 BLIZZARD WATCH...BIG ISLAND SUMMITS TIL LATE TONIGHT
 SMALL CRAFT ADVISORY...OAHU TO BIG ISLAND  TIL 6 PM
 GALE WARNING...KAUAI TO MOLOKAI TIL 6 PM.

&&

MATSUDA

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 5, 2:04 PM HST	Special Marine Warning	HFO		86 min
Dec 5, 2:33 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Dec 5, 3:06 PM HST	Blizzard Warning	HFO	Hawaii	48 hr
Dec 5, 8:30 PM HST	Flash Flood Warning	HFO	Hawaii	3 hr

Nearby

Flash Flood Warnings in Hawaii, 2007 Every flash flood warning in 2007

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.