Alert archive / Iowa / Flash Flood Warnings in 2021
Flash Flood Warning 8, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Aug 27, 2021, 8:45 PM CDT for Howard County, Mitchell County, Iowa; Fillmore County, Mower County, Minnesota. It was in force for 9 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 27, 2021, 8:45 PM CDT (01:45 UTC)
- Expired
- Aug 28, 2021, 5:15 AM CDT
- In force
- 9 hr
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Flood severity
- None
Counties Howard County, IA, Mitchell County, IA, Fillmore County, MN, Mower County, MN
The radar
The La Crosse radar (KARX), 131 km from the middle of the area, began a volume at 01:49 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 27, 11:32 PM CDT | FLASH FLOOD | 3 N New Haven, IA | DEPARTMENT OF HIGHWAYS SOCIAL MEDIA POST COUNTY ROAD A46 AND COUNTY ROAD T64 ROAD IS BLOCKED DUE TO STANDING WATER. |
| Aug 27, 11:58 PM CDT | FLASH FLOOD | 4 Ne Orchard, IA | US HIGHWAY 218 SOUTH BOUND ROAD BLOCKED DUE TO STANDING WATER FROM COUNTY ROAD A45 TO STATE HIGHWAY 9. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.8 hours before the alert went out and 163 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
- 652 J/kg
- Mixed-layer CIN
- -66 J/kg
- Mixed-layer LCL
- 643 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.5
The text
As transmitted.
816
WGUS53 KARX 280145
FFWARX
IAC089-131-MNC045-099-280545-
/O.NEW.KARX.FF.W.0008.210828T0145Z-210828T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
845 PM CDT Fri Aug 27 2021
The National Weather Service in La Crosse has issued a
* Flash Flood Warning for...
Mitchell County in north central Iowa...
Howard County in northeastern Iowa...
Southwestern Fillmore County in southeastern Minnesota...
Mower County in southeastern Minnesota...
* Until 1245 AM CDT.
* At 845 PM CDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 3 inches of
rain have fallen. Additional rainfall amounts of 2 to 4 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...
Austin, Cresco, Osage, Preston, Spring Valley, Grand Meadow, St.
Ansgar, Le Roy, Adams, Riceville, Lyle, Elma, Lime Springs,
Stacyville, Wykoff, Rose Creek, Protivin, Cherry Grove, Bristol
and York.
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 4373 9305 4373 9208 4321 9208 4321 9302
4350 9302 4350 9304
FLASH FLOOD...RADAR INDICATED
$$
KDS6 follow-up statements
558
WGUS73 KARX 280348
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
1048 PM CDT Fri Aug 27 2021
MNC045-280358-
/O.CAN.KARX.FF.W.0008.000000T0000Z-210828T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Fillmore MN-
1048 PM CDT Fri Aug 27 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHWESTERN FILLMORE
COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flash Flood Watch remains in effect until 900 AM CDT Saturday for
portions of Iowa, southeast Minnesota and southwest Wisconsin.
LAT...LON 4373 9305 4337 9209 4321 9208 4321 9302
4350 9302 4350 9304
$$
IAC089-131-MNC099-280545-
/O.CON.KARX.FF.W.0008.000000T0000Z-210828T0545Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-Mower MN-
1048 PM CDT Fri Aug 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT SATURDAY
FOR MITCHELL, HOWARD AND SOUTHERN MOWER COUNTIES...
At 1048 PM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1.5 and 6 inches of rain have fallen. Additional rainfall amounts of
1 to 2 inches are possible in the warned area. Flash flooding is
ongoing or expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
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...
Austin, Cresco, Osage, St. Ansgar, Le Roy, Adams, Riceville, Lyle,
Elma, Lime Springs, Stacyville, Rose Creek, Protivin, Mapleview,
Mitchell, McIntire, Carpenter, Orchard, Taopi and County Roads T
54 And A 31.
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 4373 9305 4337 9209 4321 9208 4321 9302
4350 9302 4350 9304
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
KDS273
WGUS53 KARX 280508
FFWARX
IAC089-131-MNC099-280645-
/O.EXT.KARX.FF.W.0008.000000T0000Z-210828T0645Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
1208 AM CDT Sat Aug 28 2021
The National Weather Service in La Crosse has extended the
* Flash Flood Warning for...
Mitchell County in north central Iowa...
Howard County in northeastern Iowa...
Southern Mower County in southeastern Minnesota...
* Until 145 AM CDT.
* At 1208 AM CDT, local law enforcement reported thunderstorms
producing heavy rain across the warned area. Between 4 and 7
inches of rain have fallen. Additional rainfall amounts up to 1
inch are possible in the warned area. Flash flooding is ongoing or
expected to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported. Multiple roads are closed
due to standing water in Mitchell County.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Austin, Cresco, Osage, St. Ansgar, Le Roy, Adams, Riceville, Lyle,
Elma, Lime Springs, and Stacyville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4373 9305 4337 9209 4321 9208 4321 9302
4350 9302 4350 9304
FLASH FLOOD...OBSERVED
$$
KDS210
WGUS53 KARX 280624
FFWARX
IAC089-131-MNC099-280815-
/O.EXT.KARX.FF.W.0008.000000T0000Z-210828T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
124 AM CDT Sat Aug 28 2021
The National Weather Service in La Crosse has extended the
* Flash Flood Warning for...
Mitchell County in north central Iowa...
Howard County in northeastern Iowa...
Southern Mower County in southeastern Minnesota...
* Until 315 AM CDT.
* At 124 AM CDT, local law enforcement reported flash flooding
across the area from earlier thunderstorms. Between 4 and 8 inches
of rain have fallen. Additional rainfall amounts up to 1 inch are
possible in the warned area. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
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...
Austin, Cresco, Osage, St. Ansgar, Le Roy, Adams, Riceville, Lyle,
Elma, Lime Springs, and Stacyville.
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 4373 9305 4337 9209 4321 9208 4321 9302
4350 9302 4350 9304
FLASH FLOOD...OBSERVED
$$
KDS992
WGUS73 KARX 280724
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
224 AM CDT Sat Aug 28 2021
MNC099-280734-
/O.CAN.KARX.FF.W.0008.000000T0000Z-210828T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Mower MN-
224 AM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING IS CANCELLED FOR SOUTHERN MOWER COUNTY...
Flooding is no longer expected to pose a threat. Please continue to
heed remaining road closures.
A Flash Flood Watch remains in effect until 900 AM CDT Saturday for
portions of Iowa, southeast Minnesota and southwest Wisconsin.
LAT...LON 4321 9302 4350 9302 4350 9244 4337 9209
4321 9208
$$
IAC089-131-280815-
/O.CON.KARX.FF.W.0008.000000T0000Z-210828T0815Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-
224 AM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 315 AM CDT EARLY THIS
MORNING FOR MITCHELL AND HOWARD COUNTIES...
At 224 AM CDT, local law enforcement reported flash flooding across
the warned area. Between 4 and 8 inches of rain have fallen. Flash
flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
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...
Cresco, Osage, St. Ansgar, Riceville, Lyle, Elma, Lime Springs,
Stacyville, Protivin, and Mitchell.
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 4321 9302 4350 9302 4350 9244 4337 9209
4321 9208
FLASH FLOOD...OBSERVED
$$
KDS721
WGUS53 KARX 280750
FFWARX
IAC089-131-281015-
/O.EXT.KARX.FF.W.0008.000000T0000Z-210828T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
250 AM CDT Sat Aug 28 2021
The National Weather Service in La Crosse has extended the
* Flash Flood Warning for...
Eastern Mitchell County in north central Iowa...
Howard County in northeastern Iowa...
* Until 515 AM CDT.
* At 250 AM CDT, local law enforcement reported flash flooding
across the warned area. Between 4 and 8 inches of rain have
fallen. Flash flooding is already occurring.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported. Multiple roads are closed
due to standing water in Mitchell County.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
Cresco, Osage, St. Ansgar, Riceville, Lyle, Elma, Lime Springs,
Stacyville, Protivin, and Mitchell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4321 9269 4350 9271 4350 9244 4337 9209
4321 9208
FLASH FLOOD...OBSERVED
$$
KDS145
WGUS73 KARX 281008 RRB
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
508 AM CDT Sat Aug 28 2021
IAC089-131-281018-
/O.EXP.KARX.FF.W.0008.000000T0000Z-210828T1015Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-
508 AM CDT Sat Aug 28 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 515 AM CDT EARLY THIS MORNING
FOR EASTERN MITCHELL AND HOWARD COUNTIES...
Heavy rain has ended over the warned area. Please continue to heed
remaining road closures.
LAT...LON 4321 9269 4350 9271 4350 9244 4337 9209
4321 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, 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, 1:16 AM CDT | Flash Flood Warning | ARX | Fayette, Winneshiek | 4 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 |
| Aug 27, 7:14 PM CDT | Special Weather Statement | ARX | Olmsted, Wabasha | 31 min |
| Aug 28, 12:11 PM CDT | Special Weather Statement | ARX | Dodge, Fillmore, Houston, Mower, Olmsted, Wabasha and 1 more | 64 min |
Nearby
Flash Flood Warnings in Iowa, 2021Flash Flood Warnings in Minnesota, 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.