Alert archive / Hawaii / Flash Flood Warnings in 2004
Flash Flood Warning 70, NWS Honolulu, HI
NWS Honolulu, HI issued this flash flood warning at Nov 22, 2004, 10:02 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
- Nov 22, 2004, 10:02 PM HST (08:02 UTC)
- Expired
- Nov 23, 2004, 1:00 AM 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, 8.0 hours before the alert went out and 77 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
- 448 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 904 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 187 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 1.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGHW50 PHFO 230806 FFWHFO HIC001-231100- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE HONOLULU HI 1002 PM HST MON NOV 22 2004 THE NATIONAL WEATHER SERVICE IN HONOLULU HAS ISSUED A * FLASH FLOOD WARNING FOR... THE ISLAND OF HAWAII IN HAWAII COUNTY * UNTIL 100 AM HST * AT 954 PM HST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A STORM 6 MILES WEST OF PAHALA. THE STORM PRODUCING HEAVY RAIN WAS NEARLY STATIONARY. * LOCATIONS IMPACTED INCLUDE... PAHALA...NAALEHU...KAPAPALA...PUNALUU AND STREAMS ALONG HIGHWAY 11 ESPECIALLY NEAR KAWA FLATS. EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF STREAMS AND COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. 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 1921 15571 1896 15560 1929 15517 1949 15540 $$ KODAMA
1 follow-up statement
000 WGHW70 PHFO 231025 FFSHFO HIC001-231032- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE HONOLULU HI 1222 AM HST TUE NOV 23 2004 ...THE FLASH FLOOD WARNING FOR THE ISLAND OF HAWAII IN HAWAII COUNTY IS CANCELLED... A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ISLAND OF HAWAII THROUGH TUESDAY. HEAVY RAINS OVER THE KAU AREA OF THE BIG ISLAND HAVE DIMINISHED. ALTHOUGH RADAR DATA INDICATED RAIN RATES AS HIGH AS 4 TO 6 INCH PER HOUR UPSLOPE OF PUNALUU AND HONUAPO...POLICE OFFICERS REPORTED NO FLOODING PROBLEMS. STAY TUNED TO NOAA WEATHER RADIO OR OTHER LOCAL MEDIA SOURCES FOR THE LATEST SEVERE WEATHER INFORMATION. REPORT FLOODING TO THE POLICE FOR IMMEDIATE RELAY TO THE NATIONAL WEATHER SERVICE. LAT...LON 1921 15571 1896 15560 1929 15517 1949 15540 $$ 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 Nov 22, 8:30 PM HST, 1 hour 32 minutes earlier.
Area forecast discussion, Nov 22, 8:30 PM HST, 1 hour 32 minutes before
HAWAIIAN ISLANDS FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 830 PM HST MON NOV 22 2004 .SYNOPSIS... SURFACE TROUGHING WILL KEEP WINDS LIGHT AS AN UPPER LEVEL LOW CONTINUES TO SLIDE SOUTHWARD ACROSS THE ISLANDS. COLD AIR ALOFT ACCOMPANYING THIS UPPER LOW WILL DESTABILIZE THE ATMOSPHERE... SETTING OFF HEAVY SHOWERS AND THUNDERSTORMS FROM THE BIG ISLAND THROUGH OAHU...AND POSSIBLY KAUAI. THE HEAVIEST RAINFALL WILL OCCUR ON THE BIG ISLAND OF HAWAII THROUGH TONIGHT...AS TROPICAL MOISTURE IS ADDED INTO THE MIX THERE. && .DISCUSSION... HAVE JUST ISSUED A WINTER STROM WATCH FOR THE SUMMITS OF MAUNA KEA AND MAUNA LOA ON THE BIG ISLAND DUE TO INCREASING DEEP CONVECTION IN THE AREA. GRIDS AND ZONES WERE UPDATED TO INCLUDE THIS HEADLINE... BUT NO OTHER CHANGES TO THE FORECAST WERE INCORPORATED AT THIS TIME. HEAVY SHOWERS ARE AFFECTING WINDWARD BIG ISLAND...WITH THUNDERSTORMS DEVELOPING NORTHEAST CLOCKWISE THROUGH SOUTHEAST OF THE ISLAND. THE UPPER LOW IS BEHAVING AS EXPECTED...PROGRESSIVELY MOVING TOWARDS THE SOUTH AT 10 TO 15 MPH...CURRENTLY CENTERED JUST NORTH OF MAUI. WHILE MOST OF THE HEAVY RAIN IS CURRENTLY NEAR THE BIG ISLAND...SHOWERS ARE INCREASING ALONG A WEAK BOUNDARY THAT EXTENDS NORTHWARD FROM OAHU. DEVELOPING CONVECTION ALONG WINDWARD BIG ISLAND WILL RESULT IN LOCALLY HEAVY DOWNPOURS. CELLS WILL BE MONITORED FOR POSSIBLE TERRAIN ANCHORING...WHICH MAY RESULT IN LOCALIZED FLOODING. THE RADAR AT SOUTH KOHALA/UPOLU POINT IS INCONVENIENTLY OUT OF SERVICE...SO SATELLITE AND RAINGAGE DATA...AS WELL AS RADAR DATA FROM SOUTH POINT...WILL BE UTILIZED TO DETERMINE THE EXTENT OF THE HEAVY RAINFALL. .PREV DISCUSSION... AN UPPER LOW NEAR 24N 156W...ABOUT 215 MILES NORTHEAST OF HONOLULU...AT 200 PM HAS BEEN MOVING SOUTH SOUTHWEST AROUND 15 MPH. A WEAK SURFACE LOW HAS BEEN NOTED IN ASSOCIATION WITH THIS UPPER LOW NEAR 25N 156W. THUNDERSTORMS ASSOCIATED WITH THIS SYSTEM HAVE BEEN DRAWN NORTHWARD MAINLY TO THE EAST AND SOUTH OF THE BIG ISLAND OF HAWAII. THIS UPPER LOW IF FORECAST TO CONTINUE MOVING SOUTHWARD OVER THE NEXT 30 HOURS...TO BE NEAR 23N 157W OR NEAR OAHU AND MOLOKAI... BY TUESDAY EVENING. AS THE UPPER LOW SINKS SOUTHWARD IT WILL LIKELY CONTINUE PULLING WARM MOIST AIR UP FROM THE TROPICS AND WRAPPING THIS MOISTURE AROUND ITS NORTHEAST QUADRANT. THIS PUTS THE BIG ISLAND OF HAWAII IN THE MOST LIKELY POSITION FOR HEAVY RAIN AND THUNDERSTORMS THROUGH TUESDAY AND INTO TUESDAY NIGHT. THUS A FLASH FLOOD WATCH HAS BEEN ISSUED FOR THE BIG ISLAND OF HAWAII FOR TONIGHT AND TUESDAY. THIS WATCH MAY BE EXTENDED TO SOME OR ALL OF THE OTHER ISLANDS TUESDAY IF NECESSARY. ISOLATED CONVECTION HAS DEVELOPED FROM MOISTURE IN A CONVERGENCE BAND EXTENDING SOUTHWEST FROM THE UPPER LOW AND OVER KAUAI AND OAHU. THESE SHOWERS ARE ON THE LIGHT TO MODERATE SIDE THIS AFTERNOON AND SHOULD END AFTER DARK. HOWEVER...AS THE UPPER LOW MOVES DOWN OVER THE CENTRAL HAWAIIAN ISLANDS LATE IN THE DAY TUESDAY INTO TUESDAY NIGHT...SCATTERED SHOWERS...SOME HEAVY...WITH ISOLATED THUNDERSTORMS WILL ALSO AFFECT THE OTHER ISLANDS OF MAUI COUNTY AND OAHU...AND POSSIBLY KAUAI...AS WELL. THESE SHOWERS WILL ALSO BE BRIEFLY HEAVY...BUT ARE NOT EXPECTED TO CAUSE FLASH FLOODING AT THE PRESENT TIME. HOWEVER...THIS SITUATION WILL BE CLOSELY WATCHED FOR FURTHER THREATS OF FLASH FLOODING. THE DEEP UNSTABLE MOISTURE WRAPPING AROUND THIS UPPER LOW WILL EVENTUALLY BE PULLED WESTWARD OVER ALL THE HAWAIIAN ISLANDS... LIKELY LATE TUESDAY NIGHT INTO WEDNESDAY. FORECAST CHARTS ARE TENDING TO WEAKEN THE UPPER LOW AND KICK IT OFF TO THE EAST OF THE STATE ON THANKSGIVING DAY...WITH SOME CLEARING LIKELY...AT LEAST BY AFTERNOON ACROSS THE STATE. .LONG TERM...AS THE UPPER LOW WEAKENS AND MOVES OFF TO THE EAST... TRADE WINDS ARE EXPECTED TO BUILD BACK OVER THE STATE THROUGH THE COMING WEEKEND AND INTO NEXT WEEK. WITH PLENTY OF MOISTURE OFF TO OUR EAST WITH THE DISTURBANCE IN THE UPPER ATMOSPHERE...EXPECT TRADES TO BE ON THE WET SIDE INTO EARLY NEXT WEEK. && .HFO WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH FOR BIG ISLAND OF HAWAII TONIGHT AND TUESDAY. WINTER STORM WATCH FOR BIG ISLAND SUMMITS TUESDAY THROUGH THANKSGIVING DAY. BIRCHARD
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 22, 8:44 PM HST | Special Marine Warning | HFO | 61 min | |
| Nov 22, 9:35 PM HST | Special Marine Warning | HFO | 55 min | |
| Nov 22, 10:24 PM HST | Special Marine Warning | HFO | 66 min |
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.