Alert archive / Iowa / Flash Flood Warnings in 2021
Flash Flood Warning 6, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Aug 27, 2021, 1:51 AM CDT for Howard County, Mitchell County, Iowa; Fillmore County, Mower County, Minnesota. It was in force for 4 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 27, 2021, 1:51 AM CDT (06:51 UTC)
- Expired
- Aug 27, 2021, 5:45 AM CDT
- In force
- 4 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), 133 km from the middle of the area, began a volume at 06:51 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, 6.9 hours before the alert went out and 160 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 792 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 393 m²/s²
- 0-3 km storm-relative helicity
- 392 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
343
WGUS53 KARX 270651
FFWARX
IAC089-131-MNC045-099-271045-
/O.NEW.KARX.FF.W.0006.210827T0651Z-210827T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
151 AM CDT Fri Aug 27 2021
The National Weather Service in La Crosse has issued a
* Flash Flood Warning for...
Northern Mitchell County in north central Iowa...
Northwestern Howard County in northeastern Iowa...
Southwestern Fillmore County in southeastern Minnesota...
Southern Mower County in southeastern Minnesota...
* Until 545 AM CDT.
* At 151 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
2 and 3.5 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 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...
Le Roy, Adams, Lyle, Lime Springs, Stacyville, Rose Creek, Cherry
Grove, York, Ostrander, and Chester.
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 4359 9305 4362 9245 4363 9227 4350 9223
4346 9222 4343 9302 4349 9302 4350 9302
4350 9305 4353 9305 4356 9305
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
KDS2 follow-up statements
965
WGUS73 KARX 271021
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
521 AM CDT Fri Aug 27 2021
IAC089-131-MNC045-099-271045-
/O.CON.KARX.FF.W.0006.000000T0000Z-210827T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-Fillmore MN-Mower MN-
521 AM CDT Fri Aug 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 545 AM CDT EARLY THIS
MORNING FOR NORTHERN MITCHELL, NORTHWESTERN HOWARD, SOUTHWESTERN
FILLMORE AND SOUTHERN MOWER COUNTIES...
At 521 AM CDT, local law enforcement reported high water was
receding across the warned area. Between 2 and 5 inches of rain have
fallen. Additional rainfall amounts up to 1 inch are possible in the
warned area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Law enforcement reported.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Le Roy, Adams, Lyle, Lime Springs, Stacyville, Rose Creek, Cherry
Grove, York, Ostrander, Chester, Taopi, Bailey, County Roads 4 And
8, Meyer, Lake Louise State Park, Johnsburg, County V 10 And 40th
Street, County Roads 4 And 3, County Roads 56 And 5 and
Toeterville.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4359 9305 4362 9245 4363 9227 4350 9223
4346 9222 4343 9302 4349 9302 4350 9302
4350 9305 4353 9305 4356 9305
FLASH FLOOD...OBSERVED
$$
Kurz199
WGUS73 KARX 271037
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
537 AM CDT Fri Aug 27 2021
IAC089-131-MNC045-099-271047-
/O.EXP.KARX.FF.W.0006.000000T0000Z-210827T1045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-Fillmore MN-Mower MN-
537 AM CDT Fri Aug 27 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 545 AM CDT THIS MORNING FOR
NORTHERN MITCHELL, NORTHWESTERN HOWARD, SOUTHWESTERN FILLMORE AND
SOUTHERN MOWER COUNTIES...
Heavy rain is ending and flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.
A Flood Watch remains in effect until 700 AM CDT for portions of
Iowa and southeast Minnesota.
LAT...LON 4359 9305 4362 9245 4363 9227 4350 9223
4346 9222 4343 9302 4349 9302 4350 9302
4350 9305 4353 9305 4356 9305
$$
KurzThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 3:33 AM CDT | Flash Flood Warning | ARX | Howard, Mitchell, Winneshiek | 4 hr |
| Aug 27, 9:42 AM CDT | River Flood Warning | ARX | Winneshiek | 60 hr |
| Aug 27, 3:24 PM CDT | Special Weather Statement | ARX | Howard, Mitchell | 51 min |
| Aug 27, 5:34 PM CDT | Tornado Warning | ARX | Floyd | 41 min |
| Aug 27, 6:09 PM CDT | Tornado Warning | ARX | Chickasaw, Floyd | 51 min |
| Aug 27, 6:45 PM CDT | Tornado Warning | ARX | Chickasaw, Fayette | 45 min |
| Aug 27, 6:52 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee, Fayette, Winneshiek | 38 min |
| Aug 27, 2:55 PM CDT | Special Weather Statement | ARX | Dodge, Olmsted, Wabasha | 50 min |
| Aug 27, 3:43 PM CDT | Special Weather Statement | ARX | Olmsted | 47 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.