Alert archive / Iowa / Flash Flood Warnings in 2021
Flash Flood Warning 11, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Aug 28, 2021, 1:16 AM CDT for Fayette County, Winneshiek County, Iowa. It was in force for 4 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 28, 2021, 1:16 AM CDT (06:16 UTC)
- Expired
- Aug 28, 2021, 5:15 AM CDT
- In force
- 4 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Fayette County, IA, Winneshiek County, IA
The radar
The La Crosse radar (KARX), 100 km from the middle of the area, began a volume at 06:15 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 28, 1:30 AM CDT | FLOOD | 4 Ssw Saint Lucas, IA | EVACUATED GOULDSBURG COUNTY PARK CAMPERS DUE TO THE RIVER RISING OUT OF ITS BANKS. |
| Aug 28, 3:10 AM CDT | FLASH FLOOD | Waucoma, IA | DEPUTIES CLOSED ROADS DUE TO FLASH FLOODING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 6.3 hours before the alert went out and 182 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
- 995 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 1707 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 53 m²/s²
- 0-3 km storm-relative helicity
- 148 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted.
589
WGUS53 KARX 280616
FFWARX
IAC065-191-280915-
/O.NEW.KARX.FF.W.0011.210828T0616Z-210828T0915Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
116 AM CDT Sat Aug 28 2021
The National Weather Service in La Crosse has issued a
* Flash Flood Warning for...
Fayette County in northeastern Iowa...
Southern Winneshiek County in northeastern Iowa...
* Until 415 AM CDT.
* At 116 AM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 3 inches of rain
have fallen. Additional rainfall amounts of 2 to 3 inches are
possible in the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
West Union, Fayette, Calmar, Ossian, Elgin, Clermont, Hawkeye,
Spillville, Fort Atkinson, Ridgeway, Waucoma, and Wadena.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 4335 9208 4313 9161 4312 9160 4310 9161
4308 9161 4306 9161 4302 9161 4301 9161
4300 9161 4299 9161 4294 9161 4293 9161
4292 9161 4282 9161 4281 9161 4280 9161
4279 9161 4279 9208
FLASH FLOOD...RADAR INDICATED
$$
KDS2 follow-up statements
521
WGUS53 KARX 280808
FFWARX
IAC065-191-281015-
/O.EXT.KARX.FF.W.0011.000000T0000Z-210828T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
308 AM CDT Sat Aug 28 2021
The National Weather Service in La Crosse has extended the
* Flash Flood Warning for...
Fayette County in northeastern Iowa...
Southern Winneshiek County in northeastern Iowa...
* Until 515 AM CDT.
* At 308 AM CDT, local law enforcement reported flash flooding
across the warned area. Between 2 and 5 inches of rain have
fallen. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported. Multiple roads are closed
due to flooding.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
West Union, Fayette, Calmar, Ossian, Elgin, Clermont, Hawkeye,
Spillville, Fort Atkinson, Ridgeway, Waucoma, and Wadena.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4323 9208 4313 9161 4312 9160 4311 9161
4310 9161 4279 9161 4279 9208
FLASH FLOOD...OBSERVED
$$
KDS953
WGUS73 KARX 281008
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
508 AM CDT Sat Aug 28 2021
IAC065-191-281018-
/O.EXP.KARX.FF.W.0011.000000T0000Z-210828T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fayette IA-Winneshiek IA-
508 AM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 AM CDT EARLY THIS MORNING
FOR FAYETTE AND SOUTHERN WINNESHIEK COUNTIES...
Heavy rain has ended over the warned area. Please continue to heed
remaining road closures.
LAT...LON 4323 9208 4313 9161 4312 9160 4311 9161
4310 9161 4279 9161 4279 9208
$$
DTJThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 7:04 PM CDT | Areal Flood Advisory | ARX | Chickasaw, Howard | 116 min |
| Aug 27, 7:29 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Clayton, Winneshiek | 46 min |
| Aug 27, 7:38 PM CDT | Flash Flood Watch | ARX | Allamakee, Chickasaw, Clayton, Fayette, Floyd, Howard and 2 more | 18 hr |
| Aug 27, 8:03 PM CDT | Severe Thunderstorm Warning | ARX | Clayton | 42 min |
| Aug 27, 8:09 PM CDT | Severe Thunderstorm Warning | ARX | Mitchell | 25 min |
| Aug 27, 8:45 PM CDT | Flash Flood Warning | ARX | Howard, Mitchell | 9 hr |
| Aug 27, 10:26 PM CDT | Special Weather Statement | ARX | Chickasaw, Howard, Winneshiek | 34 min |
| Aug 27, 11:07 PM CDT | Special Weather Statement | ARX | Winneshiek | 23 min |
| Aug 27, 11:12 PM CDT | Flash Flood Warning | ARX | Chickasaw, Floyd | 6 hr |
| Aug 28, 3:00 AM CDT | Special Weather Statement | ARX | Clayton | 30 min |
| Aug 28, 3:06 AM CDT | River Flood Warning | ARX | Clayton | 3 days |
| Aug 28, 3:06 AM CDT | River Flood Warning | ARX | Clayton | 3 days |
| Aug 28, 4:05 AM CDT | River Flood Warning | ARX | Floyd | 70 hr |
| Aug 28, 9:39 AM CDT | Areal Flood Warning | ARX | Chickasaw, Fayette, Floyd, Howard, Mitchell, Winneshiek | 30 hr |
Nearby
Flash Flood Warnings in Iowa, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.