Alert archive / Iowa / Flash Flood Warnings in 2021
Flash Flood Warning 7, NWS La Crosse, WI
NWS La Crosse, WI issued this flash flood warning at Aug 27, 2021, 3:33 AM CDT for Howard County, Mitchell County, Winneshiek County, Iowa. 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, 3:33 AM CDT (08:33 UTC)
- Expired
- Aug 27, 2021, 7:30 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, Winneshiek County, IA
The radar
The La Crosse radar (KARX), 91 km from the middle of the area, began a volume at 08:34 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, 8.6 hours before the alert went out and 194 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.
305
WGUS53 KARX 270833
FFWARX
IAC089-131-191-271230-
/O.NEW.KARX.FF.W.0007.210827T0833Z-210827T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service La Crosse WI
333 AM CDT Fri Aug 27 2021
The National Weather Service in La Crosse has issued a
* Flash Flood Warning for...
Northeastern Mitchell County in north central Iowa...
Howard County in northeastern Iowa...
Northwestern Winneshiek County in northeastern Iowa...
* Until 730 AM CDT.
* At 333 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between
1 and 3 inches of rain have fallen. Additional rainfall amounts of
1 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...
Decorah, Cresco, Riceville, Elma, Lime Springs, Stacyville, and
Ridgeway.
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 4343 9292 4346 9223 4350 9223 4350 9222
4350 9220 4350 9217 4350 9214 4350 9213
4350 9212 4350 9208 4350 9206 4350 9199
4350 9195 4350 9169 4325 9185 4321 9207
4321 9208 4322 9255
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
KDS2 follow-up statements
834
WGUS73 KARX 271051
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
551 AM CDT Fri Aug 27 2021
IAC089-131-191-271230-
/O.CON.KARX.FF.W.0007.000000T0000Z-210827T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-Winneshiek IA-
551 AM CDT Fri Aug 27 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM CDT THIS
MORNING FOR NORTHEASTERN MITCHELL, HOWARD AND NORTHWESTERN
WINNESHIEK COUNTIES...
At 551 AM CDT, Doppler radar and automated rain gauges indicated
thunderstorms producing heavy rain across the warned area. Between 2
and 4 inches of rain have fallen. Additional rainfall of up to 1
inch is possible in the warned area.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar and automated gauges.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
Decorah, Cresco, Riceville, Elma, Lime Springs, Stacyville,
Ridgeway, Protivin, McIntire, Davis Corners, Schley, Bonair,
Vernon Springs, Vernon Springs County Park, Lourdes, Maple Leaf,
and Hayden Prairie.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 4343 9292 4346 9223 4350 9223 4350 9222
4350 9220 4350 9217 4350 9214 4350 9213
4350 9212 4350 9208 4350 9206 4350 9199
4350 9195 4350 9169 4325 9185 4321 9207
4321 9208 4322 9255
FLASH FLOOD...RADAR AND GAUGE INDICATED
$$
Kurz926
WGUS73 KARX 271224
FFSARX
Flash Flood Statement
National Weather Service La Crosse WI
724 AM CDT Fri Aug 27 2021
IAC089-131-191-271234-
/O.EXP.KARX.FF.W.0007.000000T0000Z-210827T1230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Howard IA-Mitchell IA-Winneshiek IA-
724 AM CDT Fri Aug 27 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 730 AM CDT THIS MORNING FOR
NORTHEASTERN MITCHELL, HOWARD AND NORTHWESTERN WINNESHIEK COUNTIES...
While some additional rainfall is expected this morning, the
heaviest rain has come to an end, and high water has receded.
Flooding is no longer expected to pose a threat. Please continue to
heed any remaining road closures.
LAT...LON 4343 9292 4346 9223 4350 9223 4350 9222
4350 9220 4350 9217 4350 9214 4350 9213
4350 9212 4350 9208 4350 9206 4350 9199
4350 9195 4350 9169 4325 9185 4321 9207
4321 9208 4322 9255
$$
KurzThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 1:51 AM CDT | Flash Flood Warning | ARX | Howard, Mitchell | 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 |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.