Alert archive / Hawaii / Flash Flood Warnings in 2004
Flash Flood Warning 69, NWS Honolulu, HI
NWS Honolulu, HI issued this flash flood warning at Oct 31, 2004, 2:30 PM HST for Honolulu 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
- Oct 31, 2004, 2:30 PM HST (00:30 UTC)
- Expired
- Oct 31, 2004, 5:30 PM HST
- In force
- 3 hr
- Issued by
- NWS Honolulu, HI
- Area
- Counties, with a storm outline in the text
County Honolulu 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
Lihue, (PHLI), launched 00:00Z, 0.5 hours before the alert went out and 149 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.
- Mixed-layer CAPE
- 675 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1081 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 18 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGHW50 PHFO 010029 FFWHFO HIC003-010330- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HONOLULU HI 230 PM HST SUN OCT 31 2004 THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A * FLASH FLOOD WARNING FOR... THE ISLAND OF OAHU IN HONOLULU COUNTY * UNTIL 530 PM HST * AT 218 PM HST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A STORM OVER WAIPIO...OR 12 MILES NORTHWEST OF HONOLULU. THE STORM PRODUCING FLASH FLOODING WAS NEARLY STATIONARY. * LOCATIONS IMPACTED INCLUDE... WHEELER AFB...WAIPAHU...MILILANI...AIEA...PEARL CITY...MAKAKILO CITY...WAHIAWA...WAIPIO...HALAWA... THIS FLASH FLOOD WARNING REPLACES THE FLOOD ADVISORY THAT WAS IN EFFECT. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS AND COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS...HIGHWAYS...UNDERPASSES AND LOW LYING AREAS. 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. STAY TUNED TO NOAA WEATHER RADIO OR OTHER LOCAL MEDIA SOURCES FOR THE LATEST SEVERE WEATHER INFORMATION. REPORT FLOODING TO THE POLICE FOR IMMEDIATE RELAY TO THE NATIONAL WEATHER SERVICE. LAT...LON 2155 15810 2136 15814 2133 15793 2149 15787 $$ POWELL
1 follow-up statement
000 WGHW70 PHFO 010221 FFSHFO HIC003-010229- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE HONOLULU HI 419 PM HST SUN OCT 31 2004 ...THE FLASH FLOOD WARNING FOR THE ISLAND OF OAHU IN HONOLULU COUNTY IS CANCELLED... RADAR SHOWS THAT SHOWERS HAVE RAPIDLY COLLAPSED ACROSS CENTRAL OAHU...AND THAT THE THREAT OF FLASH FLOODING HAS DIMINISHED. STAY TUNED TO NOAA WEATHER RADIO OR OTHER LOCAL MEDIA SOURCES FOR THE LATEST SEVERE WEATHER INFORMATION. REPORT FLOODING TO THE POLICE FOR IMMEDIATE RELAY TO THE NATIONAL WEATHER SERVICE. LAT...LON 2155 15810 2136 15814 2133 15793 2149 15787 $$ POWELL
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 Oct 31, 9:30 AM HST, 5 hours earlier.
Area forecast discussion, Oct 31, 9:30 AM HST, 5 hours before
HAWAIIAN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 930 AM HST SUN OCT 31 2004 .SYNOPSIS... SHOWERS WILL CONTINUE TO FALL OVER THE ISLANDS OVER THE NEXT COUPLE OF DAYS. SOUTHEASTERLY WINDS WILL ALLOW THE SHOWERS TO COVER MORE THAN THE USUAL WINDWARD AND MAUKA AREAS. A TROUGH TO THE NORTHWEST OF THE ISLANDS WILL ALLOW FOR ISOLATED THUNDERSTORMS TO DEVELOP...MAINLY DURING THE AFTERNOON HOURS. && .DISCUSSION... A NORTHEAST TO SOUTHWEST ORIENTED TROUGH IS NORTHWEST OF THE MAIN HAWAIIAN ISLANDS. THE TROUGH HELPED TO TRIGGER SOME HEAVY RAINS LAST NIGHT...PARTICULARLY IN THE MANOA AREA. THE HEAVIEST RAIN AT THE MANOA LYON ARBORETUM GAGE FELL BETWEEN 645 PM AND 730 PM WHEN 3.13 INCHES OF RAIN FELL. THE HEAVIEST 15 MINUTE RAINFALL WAS FROM 7 PM TO 715 PM WHEN 1.29 INCHES OF RAIN FELL. SEVERAL GAGES ON OAHU REPORTED 24 HOUR RAINFALL TOTALS OF 4 INCHES OR GREATER BETWEEN 5 AM SATURDAY AND 5 AM SUNDAY. DURING THAT TIME...THE MANOA LYON ARBORETUM GAGE REPORTED 9.97 INCHES...THE WILSON TUNNEL GAGE PICKED UP 6.75 INCHES...LULUKU HAD 6.45...AND ST. STEPHENS HAD 4.68 INCHES OF RAIN. THE MODELS SHOW THE UPPER LEVEL TROUGH WEAKENING A BIT TODAY...BUT ALL ARE DEVELOPING AN UPPER TROUGH FAR TO THE NORTHWEST OF THE ISLANDS TODAY. THE NOGAPS DEVELOPS THE TROUGH DEEPER THAN THE ECMWF AND GFS. THE NOGAPS CLOSES THE SYSTEM OFF AT 500 MB BY MONDAY AFTERNOON ALMOST DUE WEST OF THE ISLANDS. BY MONDAY NIGHT...THE GFS CLOSES THE SYSTEM OFF NORTH NORTHWEST OF THE ISLANDS. THE ECMWF IS MORE IN LINE WITH THE GFS. RIGHT NOW WILL FOLLOW CLOSER TO THE GFS AND ECMWF MODELS. A COLD FRONT IS FORECAST TO DEVELOP AT THE SURFACE...ASSOCIATED WITH THE UPPER LEVEL SYSTEM. THE GFS AND ECMWF BOTH RACE THE FRONT OVER THE ISLANDS NEXT WEEKEND. WILL HOLD OFF MAKING ANY MAJOR CHANGES TO THE GRIDS FOR NEXT WEEKEND UNTIL FUTURE RUNS COME IN. HAVE UPPED THE POPS AND SKY OVER SEVERAL LOCATIONS FOR TONIGHT. BACKED OFF ON THE HEAVY RAINS OVER OAHU FOR THIS AFTERNOON. SHOWERS WILL DEFINITELY BE AROUND...BUT DIFFICULT TO SAY EXACTLY WHO WILL SEE ANY HEAVIER SHOWERS. HAVE LEFT ISOLATED THUNDERSTORMS IN THE FORECAST FOR THE KOOLAU RANGE OF OAHU THIS AFTERNOON. UNSTABLE AIR AROUND THE STATE COULD LEAD TO DEVELOPMENT ELSEWHERE. VISIBLE SATELLITE THIS MORNING SHOWS KAUAI MOSTLY CLEAR...SO WILL HAVE TO MONITOR THE GARDEN ISLE CLOSELY FOR AFTERNOON DEVELOPMENT. HIGH CLOUDS OVER OAHU AND AREAS EAST HAVE STARTED TO THIN A BIT OVER THE LAST COUPLE OF HOURS. THROUGH THIN SPOTS IN THE HIGH CLOUDS...CLOUDS ARE SEEN BUILDING OVER THE KOOLAU AND WAIANAE RANGE ON OAHU. && .HFO WATCHES/WARNINGS/ADVISORIES...NONE. && M BALLARD
Nearby
Flash Flood Warnings in Hawaii, 2004Every flash flood warning in 2004
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.