Alert archive / Iowa / Flash Flood Warnings in 2004
Flash Flood Warning 4, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at May 21, 2004, 7:41 PM CDT for Allamakee County, Winneshiek County, Iowa. 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
- May 21, 2004, 7:41 PM CDT (00:41 UTC)
- Expired
- May 21, 2004, 10:45 PM CDT
- In force
- 3 hr
- Issued by
- NWS La Crosse, WI
- Area
- Counties, with a storm outline in the text
Counties Allamakee County, IA, Winneshiek County, IA
The radar
The La Crosse radar (KARX), 76 km from the middle of the area, began a volume at 00:41 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 0.7 hours before the alert went out and 232 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
- 2 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 512 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 215 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS53 KARX 220043 FFWARX IAC005-191-220345- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE LA CROSSE WI 741 PM CDT FRI MAY 21 2004 THE NATIONAL WEATHER SERVICE IN LA CROSSE HAS ISSUED A * FLASH FLOOD WARNING FOR... WINNESHIEK COUNTY IN NORTHEAST IOWA ALLAMAKEE COUNTY IN NORTHEAST IOWA * UNTIL 1045 PM CDT * AT 741 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED THUNDERSTORMS PRODUCING VERY HEAVY RAIN EXTENDING FROM 13 MILES NORTHEAST OF NEW HAMPTON TO 14 MILES NORTH OF ELKADER. ESTIMATES FROM RADAR INDICATED THAT NEARLY 1 INCH OF RAIN HAS FALLEN DURING THE PAST HOUR JUST SOUTH OF THE WARNED AREA. THIS RAIN WILL MOVE ACROSS THE AREA...AND THE ALREADY SATURATED GROUNDS. THE STORMS PRODUCING THE VERY HEAVY RAINFALL WERE MOVING NORTHEAST AT 35 MPH. * SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...CALMAR...DECORAH... SPILLVILLE...WAUKON...COUNTY ROADS A 26 AND X 6 A...COUNTY ROADS X 16 AND W 48 AND STATE ROAD 76 AND COUNTY X 16. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT. IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO FORGE FLOODED ROADWAYS BY FOOT OR AUTOMOBILE. IF YOUR VEHICLE STALLS... ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. LAT...LON 4315 9204 4312 9136 4343 9129 4343 9188 $$ RIECK
1 follow-up statement
000 WGUS73 KARX 220159 FFSARX IAC005-191-220345- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE LA CROSSE WI 859 PM CDT FRI MAY 21 2004 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR ALLAMAKEE AND WINNESHIEK COUNTIES... AT 857 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED THUNDERSTORMS PRODUCING VERY HEAVY RAIN SOUTH OF A LANSING TO CALMAR LINE. ESTIMATES FROM RADAR INDICATED THAT NEARLY 1 INCH OF RAIN HAS FALLEN DURING THE PAST HOUR OVER THE WARNED AREA. THE STORMS PRODUCING THE VERY HEAVY RAINFALL WERE MOVING EAST AT 25 MPH. SOME LOCATIONS THAT MAY BE AFFECTED INCLUDE...CALMAR...DECORAH... OSSIAN AND SPILLVILLE. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT. IF YOU ARE IN THE WARNED AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO FORGE FLOODED ROADWAYS BY FOOT OR AUTOMOBILE. IF YOUR VEHICLE STALLS... ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. LAT...LON 4315 9204 4312 9136 4343 9129 4343 9188 $$ RABERDING
The office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:00 PM CDT | Flash Flood Warning | ARX | Chickasaw, Floyd | 3 hr |
| May 21, 7:25 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 35 min |
| May 21, 8:35 PM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 3 hr |
| May 21, 9:08 PM CDT | Flash Flood Warning | ARX | Howard, Mitchell | 3 hr |
| May 21, 9:09 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 51 min |
| May 21, 9:57 PM CDT | Flash Flood Warning | ARX | Chickasaw, Floyd | 3 hr |
| May 21, 10:45 PM CDT | Flash Flood Warning | ARX | Allamakee, Winneshiek | 3 hr |
| May 21, 11:28 PM CDT | Flash Flood Warning | ARX | Clayton, Fayette | 3 hr |
| May 22, 12:11 AM CDT | Flash Flood Warning | ARX | Howard, Mitchell | 3 hr |
| May 22, 12:18 AM CDT | Severe Thunderstorm Warning | ARX | Floyd | 57 min |
| May 22, 12:59 AM CDT | Flash Flood Warning | ARX | Chickasaw, Floyd | 3 hr |
| May 22, 2:07 AM CDT | Severe Thunderstorm Warning | ARX | Fayette | 38 min |
| May 22, 2:16 AM CDT | Severe Thunderstorm Warning | ARX | Clayton | 44 min |
Nearby
Flash Flood Warnings in Iowa, 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; radar from the NEXRAD Level II archive.