Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 84, NWS La Crosse, WI
NWS La Crosse, WI issued this severe thunderstorm warning at Aug 11, 2021, 3:06 PM CDT for Richland County, Vernon County, Wisconsin. It was in force for 54 min. 3 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 11, 2021, 3:06 PM CDT (20:06 UTC)
- Expired
- Aug 11, 2021, 4:00 PM CDT
- In force
- 54 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Hail
- 1.5 in
- Wind
- 50.0 mph
Counties Richland County, WI, Vernon County, WI
The radar
The La Crosse radar (KARX), 63 km from the middle of the area, began a volume at 20:08 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 11, 3:11 PM CDT | HAIL 0.75 | 1 N Viroqua, WI | REPORT FROM MPING: DIME (0.75 IN.). |
| Aug 11, 3:15 PM CDT | HAIL 0.25 | Viroqua, WI | |
| Aug 11, 3:28 PM CDT | HAIL 0.25 | La Farge, WI |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 11, 12:17 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 8.1 hours before the alert went out and 214 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
- 2852 J/kg
- Mixed-layer CIN
- -107 J/kg
- Mixed-layer LCL
- 1040 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 170 m²/s²
- 0-3 km storm-relative helicity
- 193 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.7
The text
As transmitted.
005
WUUS53 KARX 112006
SVRARX
WIC103-123-112100-
/O.NEW.KARX.SV.W.0084.210811T2006Z-210811T2100Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
306 PM CDT Wed Aug 11 2021
The National Weather Service in La Crosse has issued a
* Severe Thunderstorm Warning for...
Central Vernon County in southwestern Wisconsin...
Northwestern Richland County in southwestern Wisconsin...
* Until 400 PM CDT.
* At 306 PM CDT, a severe thunderstorm was located over Viroqua,
moving east at 35 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect
damage to roofs, siding, windows, and vehicles.
* This severe thunderstorm will be near...
Viroqua and Westby around 310 PM CDT.
La Farge around 330 PM CDT.
Hillsboro around 355 PM CDT.
Other locations impacted by this severe thunderstorm include Bartons
Corners, Esofea, Runge Hollow, County Roads B And Y, Liberty, Highway
80 And County C C and Woodstock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
&&
LAT...LON 4341 9031 4352 9102 4367 9101 4368 9031
4356 9031 4355 9029
TIME...MOT...LOC 2006Z 273DEG 30KT 4358 9093
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB8 follow-up statements
439
WWUS53 KARX 112014
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
314 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
314 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR CENTRAL VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 313 PM CDT, a severe thunderstorm was located over Viroqua, moving
east at 35 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
This severe storm will be near...
La Farge around 330 PM CDT.
Hillsboro around 355 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a
place of safety inside a sturdy structure, such as a basement or
small interior room.
&&
LAT...LON 4341 9031 4352 9096 4366 9095 4368 9031
4356 9031 4355 9029
TIME...MOT...LOC 2013Z 273DEG 30KT 4358 9084
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB222
WWUS53 KARX 112018
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
318 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
318 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR EASTERN VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 317 PM CDT, a severe thunderstorm was located near Viroqua, moving
east at 35 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe storm will be near...
La Farge around 330 PM CDT.
Hillsboro around 355 PM CDT.
Other locations impacted by this severe thunderstorm include Bartons
Corners, Liberty, Highway 80 And County C C, Woodstock, Bloom City,
Benders Corners and Yuba.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted act quickly and move to a
place of safety inside a sturdy structure, such as a basement or
small interior room.
&&
LAT...LON 4351 9093 4366 9084 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2017Z 273DEG 30KT 4357 9080
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB093
WWUS53 KARX 112022
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
322 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
322 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHEASTERN VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 320 PM CDT, a severe thunderstorm was located near La Farge, or
near Viroqua, moving east at 40 mph. There was a funnel cloud
reported with this storm southeast of Viroqua.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe storm will be near...
La Farge around 330 PM CDT.
Hillsboro around 350 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
&&
LAT...LON 4351 9093 4364 9079 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2020Z 267DEG 35KT 4355 9075
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB685
WWUS53 KARX 112031
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
331 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
331 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHEASTERN VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 329 PM CDT, a severe thunderstorm was located near La Farge, or 9
miles east of Viroqua, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated. At 329 PM, pea size hail was reported by a
spotter in Westby.
IMPACT...Damage to vehicles is expected.
This severe storm will be near...
La Farge around 335 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
&&
LAT...LON 4351 9093 4364 9071 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2029Z 279DEG 25KT 4352 9071
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB197
WWUS53 KARX 112035
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
335 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
335 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHEASTERN VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 335 PM CDT, a severe thunderstorm was located near La Farge, or 11
miles east of Viroqua, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe storm will be near...
Hillsboro around 410 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
&&
LAT...LON 4351 9093 4364 9064 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2035Z 264DEG 27KT 4352 9067
TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB848
WWUS53 KARX 112041
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
341 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
341 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR SOUTHEASTERN VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 341 PM CDT, a severe thunderstorm was located near La Farge, or 13
miles east of Viroqua, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
This severe thunderstorm will remain over mainly rural areas of
southeastern Vernon and northwestern Richland Counties, including the
following locations... Highway 80 And County C C, Woodstock, White
City, Bloom City, Benders Corners, Yuba and Buck Creek.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
&&
LAT...LON 4349 9074 4364 9064 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2041Z 265DEG 24KT 4352 9063
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB299
WWUS53 KARX 112047
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
347 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.CON.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
347 PM CDT Wed Aug 11 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CDT
FOR EAST CENTRAL VERNON AND NORTHWESTERN RICHLAND COUNTIES...
At 346 PM CDT, a severe thunderstorm was located near La Farge, or 15
miles east of Viroqua, moving east at 30 mph.
HAZARD...Quarter size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
&&
LAT...LON 4349 9067 4361 9060 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2046Z 265DEG 24KT 4352 9058
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
JSB674
WWUS53 KARX 112051
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
351 PM CDT Wed Aug 11 2021
WIC103-123-112100-
/O.EXP.KARX.SV.W.0084.000000T0000Z-210811T2100Z/
Vernon WI-Richland WI-
351 PM CDT Wed Aug 11 2021
...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL VERNON AND
NORTHWESTERN RICHLAND COUNTIES WILL EXPIRE AT 400 PM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire. However small hail
is still possible with this thunderstorm.
A Tornado Watch remains in effect until 800 PM CDT for central and
southwestern Wisconsin.
LAT...LON 4349 9067 4361 9060 4368 9031 4356 9031
4355 9029 4341 9031
TIME...MOT...LOC 2050Z 273DEG 30KT 4352 9055
$$
JSBThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 9:19 PM CDT | River Flood Warning | ARX | La Crosse, Trempealeau | 30 hr |
| Aug 11, 11:32 AM CDT | Special Weather Statement | ARX | Taylor | 28 min |
| Aug 11, 11:57 AM CDT | Special Weather Statement | ARX | Clark, Taylor | 33 min |
| Aug 11, 12:18 PM CDT | Severe Thunderstorm Warning | ARX | Taylor | 42 min |
| Aug 11, 12:31 PM CDT | Special Weather Statement | ARX | Clark, Jackson, La Crosse, Monroe | 59 min |
| Aug 11, 1:01 PM CDT | Tornado Warning | ARX | Clark | 17 min |
| Aug 11, 1:07 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Monroe | 38 min |
| Aug 11, 1:41 PM CDT | Severe Thunderstorm Warning | ARX | Juneau, Monroe | 64 min |
| Aug 11, 1:48 PM CDT | Tornado Warning | ARX | Juneau, Monroe | 42 min |
| Aug 11, 2:06 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Monroe | 39 min |
| Aug 11, 2:18 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Monroe, Vernon | 42 min |
| Aug 11, 2:20 PM CDT | Tornado Warning | ARX | Adams, Juneau, Monroe | 55 min |
| Aug 11, 2:32 PM CDT | Severe Thunderstorm Warning | ARX | Monroe | 28 min |
| Aug 11, 4:19 PM CDT | Special Weather Statement | ARX | Grant | 26 min |
| Aug 11, 4:23 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 22 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2021Every severe thunderstorm 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.