Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 103, NWS La Crosse, WI

September 20, 2021Crawford County, Grant County, Richland County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Sep 20, 2021, 7:20 PM CDT for Crawford County, Grant County, Richland County, Wisconsin. It was in force for 40 min. 1 report 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: Sep 20, 2021, 7:20 PM CDT (00:20 UTC)
Expired: Sep 20, 2021, 8:00 PM CDT
In force: 40 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Crawford County, WI, Grant County, WI, Richland County, WI

The radar

The La Crosse radar (KARX), 97 km from the middle of the area, began a volume at 00:20 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
Sep 20, 7:25 PM CDT	TSTM WND GST 48	1 Ne Boscobel, WI	ASOS STATION KOVS BOSCOBEL AIRPORT.

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
Sep 20, 2:07 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 167 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1090 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1240 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 3.7

Open this sounding in Storm Lab

The text

As transmitted.

276 
WUUS53 KARX 210020
SVRARX
WIC023-043-103-210100-
/O.NEW.KARX.SV.W.0103.210921T0020Z-210921T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
720 PM CDT Mon Sep 20 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Northeastern Grant County in southwestern Wisconsin...
  Southern Richland County in southwestern Wisconsin...
  East central Crawford County in southwestern Wisconsin...

* Until 800 PM CDT.

* At 720 PM CDT, severe thunderstorms were located along a line
  extending from near Boscobel to 7 miles north of Fennimore to near
  Lancaster, moving northeast at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Muscoda around 735 PM CDT.
  Richland Center around 750 PM CDT.

Other locations impacted by these severe thunderstorms include
Preston, Highway 61 And County T, Montfort, Eagle Cave, Mount Ida,
Plugtown and Ithaca.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4288 9082 4305 9072 4318 9090 4343 9019
      4317 9019 4320 9026 4320 9028 4321 9029
      4320 9043 4293 9043
TIME...MOT...LOC 0020Z 243DEG 41KT 4314 9077 4308 9065 4291 9077 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Skow

3 follow-up statements

232 
WWUS53 KARX 210032
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
732 PM CDT Mon Sep 20 2021

WIC023-210041-
/O.CAN.KARX.SV.W.0103.000000T0000Z-210921T0100Z/
Crawford WI-
732 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CRAWFORD COUNTY
IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Wisconsin.

LAT...LON 4294 9062 4314 9058 4326 9066 4343 9019
      4317 9019 4320 9026 4320 9028 4321 9029
      4320 9043 4297 9043
TIME...MOT...LOC 0031Z 241DEG 47KT 4325 9052 4319 9040 4302 9052 

$$

WIC043-103-210100-
/O.CON.KARX.SV.W.0103.000000T0000Z-210921T0100Z/
Grant WI-Richland WI-
732 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR NORTHEASTERN GRANT AND SOUTHERN RICHLAND COUNTIES...

At 731 PM CDT, severe thunderstorms were located along a line
extending from 9 miles southwest of Richland Center to Muscoda to 6
miles northeast of Fennimore, moving northeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated. At 7:25pm, a 48 mph wind gust was 
         measured in Boscobel.

IMPACT...Expect damage to roofs, siding, and trees.

These severe storms will be near...
  Richland Center around 745 PM CDT.

Other locations impacted by these severe thunderstorms include
Preston, Montfort, Eagle Cave, Ithaca, Eagle Corners, Highway 58 And
County B and Sextonville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4294 9062 4314 9058 4326 9066 4343 9019
      4317 9019 4320 9026 4320 9028 4321 9029
      4320 9043 4297 9043
TIME...MOT...LOC 0031Z 241DEG 47KT 4325 9052 4319 9040 4302 9052 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Skow

161 
WWUS53 KARX 210043
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
743 PM CDT Mon Sep 20 2021

WIC043-210053-
/O.CAN.KARX.SV.W.0103.000000T0000Z-210921T0100Z/
Grant WI-
743 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN GRANT COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Wisconsin.

LAT...LON 4329 9056 4343 9019 4317 9019 4320 9026
      4320 9028 4321 9029 4320 9043 4325 9051
TIME...MOT...LOC 0043Z 243DEG 41KT 4331 9035 4325 9023 4308 9035 

$$

WIC103-210100-
/O.CON.KARX.SV.W.0103.000000T0000Z-210921T0100Z/
Richland WI-
743 PM CDT Mon Sep 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR SOUTHEASTERN RICHLAND COUNTY...

At 743 PM CDT, severe thunderstorms were located along a line
extending from near Richland Center to 9 miles northwest of Spring
Green to 8 miles southeast of Muscoda, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

These severe thunderstorms will remain over mainly rural areas of
southeastern Richland County, including the following locations...
County Roads O And O O, Highways 58 And 154, Ithaca, Highway 58 And
County B, Orion, Lone Rock and Keyesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4329 9056 4343 9019 4317 9019 4320 9026
      4320 9028 4321 9029 4320 9043 4325 9051
TIME...MOT...LOC 0043Z 243DEG 41KT 4331 9035 4325 9023 4308 9035 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Skow

364 
WWUS53 KARX 210054
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
754 PM CDT Mon Sep 20 2021

WIC103-210104-
/O.EXP.KARX.SV.W.0103.000000T0000Z-210921T0100Z/
Richland WI-
754 PM CDT Mon Sep 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN RICHLAND COUNTY
WILL EXPIRE AT 800 PM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Wisconsin.

LAT...LON 4329 9056 4343 9019 4317 9019 4320 9026
      4320 9028 4321 9029 4320 9043 4325 9051
TIME...MOT...LOC 0054Z 243DEG 41KT 4336 9020 4330 9008 4313 9021 

$$

Skow

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 20, 7:01 PM CDT	Special Weather Statement	ARX	Crawford, Grant, Juneau, Monroe, Richland, Vernon	44 min
Sep 20, 7:17 PM CDT	Tornado Warning	ARX	Richland, Vernon	28 min
Sep 20, 7:41 PM CDT	Severe Thunderstorm Warning	ARX	Juneau, Monroe, Richland, Vernon	34 min
Sep 20, 7:48 PM CDT	Special Weather Statement	ARX	Grant	27 min
Sep 20, 7:58 PM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	47 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every 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.