Alert archive / Hawaii / Flash Flood Warnings in 2004
Flash Flood Warning 58, NWS Honolulu, HI
NWS Honolulu, HI issued this flash flood warning at Aug 4, 2004, 6:45 AM 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
- Aug 4, 2004, 6:45 AM HST (16:45 UTC)
- Expired
- Aug 4, 2004, 9:45 AM 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 12:00Z, 4.8 hours before the alert went out and 150 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
- 1527 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 476 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 43 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGHW50 PHFO 041651 FFWHFO HIC003-041945- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HONOLULU HI 645 AM HST WED AUG 4 2004 THE NATIONAL WEATHER SERVICE IN HONOLULU HAS CONTINUED A * FLASH FLOOD WARNING FOR... THE ISLAND OF OAHU IN HONOLULU COUNTY * UNTIL 945 AM HST * AT 640 AM HST...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED HEAVY RAIN CONTINUING OVER OAHU. ADDITIONAL HEAVY RAIN SHOWERS ARE MOVING TOWARD OAHU FROM THE SOUTH AT 10 MILES PER HOUR. * LOCATIONS IMPACTED INCLUDE... PUNALUU...WAIAHOLE...WAIKANE...KAILUA...KANEOHE...HAWAII KAI... HONOLULU...PEARL CITY...AIEA...EWA...WAIANAE...MILILANI AND WAHIAWA. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS...HIGHWAYS...UNDERPASSES AND LOW LYING AREAS. STREAMS AND ROADS ALONG WINDWARD OAHU FROM PUNALUU TO WAIMANALO ARE ESPECIALLY VULNERABLE DUE TO SATURATED GROUND CONDITIONS FROM OVERNIGHT RAINFALL. AREAS NEAR STEEP TERRAIN WILL ALSO BE VULNERABLE TO ROCK AND MUD SLIDES. 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 LAT...LON 2127 15814 2126 15758 2175 15799 2157 15828 $$ FARRELL/WROE
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 4, 4:00 AM HST, 2 hours 45 minutes earlier.
Area forecast discussion, Aug 4, 4:00 AM HST, 2 hours 45 minutes before
HAWAIIAN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 400 AM HST WED AUG 4 2004 .SYNOPSIS... THE REMNANT TROPICAL MOISTURE FROM TROPICAL STORM DARBY REMAINS OVER THE MAIN HAWAIIAN ISLANDS THIS MORNING. HEAVY SHOWERS AND THUNDERSTORMS WILL BE MOVING OVER THE ISLANDS TODAY...AND CONTINUING OVER KAUAI TONIGHT. TRADE WINDS...WITH THEIR MORE NORMAL PATTERN OF WINDWARD AND MAUKA...NIGHT AND MORNING SHOWERS...WILL RETURN ON THURSDAY. && .DISCUSSION... HEAVY SHOWERS CONTINUE TO MOVE UP OVER OAHU...MOLOKAI AND LANAI FROM THE SOUTH THIS MORNING...WHILE KAUAI IS SEEING HEAVY SHOWERS AND THUNDERSTORMS MOVING IN FROM THE EAST. THE DIVIDING LINE BETWEEN SOUTH OR SOUTHEAST WINDS AND EAST OR NORTHEAST WINDS IS A SURFACE TROUGH OF LOW PRESSURE...NOW LOCATED IN THE KAUAI CHANNEL. A TROUGH OF LOW PRESSURE IN THE UPPER ATMOSPHERE TO THE WEST OF KAUAI IS KEEPING THE ATMOSPHERE OVER THE HAWAIIAN ISLANDS AND THE REMNANT TROPICAL MOISTURE UNSTABLE...AND THIS IS PROMPTING THE CONVECTION OVER THE STATE. THE TROUGH AND SHOWERS ARE MOVING WESTWARD AT ABOUT 7 MPH...AND WILL CONTINUE TO AFFECT THE ISLANDS FROM KAUAI TO MOLOKAI THROUGH THE DAY. BY THURSDAY AND FRIDAY MORE TYPICAL TRADE WIND WEATHER IS EXPECTED THANKS TO HIGH PRESSURE FAR NORTH OF THE STATE. TRADE WINDS WILL BE IN THE 10 TO 20 MPH RANGE WITH SHOWERS MAINLY CONFINED TO WINDWARD AND MAUKA AREAS. && .LONG TERM... WE ARE ALSO WATCHING ANOTHER AREA OF SHOWERY WEATHER THAT MAY APPROACH THE ISLANDS OVER THE WEEKEND. TROPICAL DEPRESSION SIX-E IS LOCATED ABOUT 1500 MILES EAST SOUTHEAST OF HONOLULU. THE NATIONAL HURRICANE CENTER IN MIAMI HAS ISSUED ITS LAST ADVISORY ON THIS SYSTEM BUT THE GFS AND NOGAPS MODELS STILL BRING A LARGE AREA OF REMNANT TROPICAL MOISTURE OVER THE STATE LATE FRIDAY INTO SATURDAY BRINGING THE THREAT OF HEAVY RAINFALL ONCE AGAIN TO THE STATE. && .HFO WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH ALL ISLANDS. HIGH SURF ADVISORY EAST SHORES OF KAUAI OAHU MOLOKAI MAUI AND THE BIG ISLAND. && FARRELL
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 3, 2:20 PM HST | Flash Flood Warning | HFO | Kalawao | 3 hr |
| Aug 3, 7:11 PM HST | Flash Flood Warning | HFO | Kalawao | 3 hr |
| Aug 4, 3:45 AM HST | Flash Flood Warning | HFO | Honolulu | 3 hr |
| Aug 4, 9:32 AM HST | Flash Flood Warning | HFO | Honolulu | 3 hr |
| Aug 4, 10:45 AM HST | Flash Flood Warning | HFO | Kauai | 3 hr |
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.