Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 76, NWS La Crosse, WI

August 10, 2021Crawford County, Grant County, Richland County, Wisconsin; Allamakee County, Iowa

NWS La Crosse, WI issued this severe thunderstorm warning at Aug 10, 2021, 3:56 PM CDT for Crawford County, Grant County, Richland County, Wisconsin; Allamakee County, Iowa. It was in force for 64 min. 5 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 10, 2021, 3:56 PM CDT (20:56 UTC)
Expired: Aug 10, 2021, 5:00 PM CDT
In force: 64 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Allamakee County, IA, Crawford County, WI, Grant County, WI, Richland County, WI

The radar

The La Crosse radar (KARX), 112 km from the middle of the area, began a volume at 20:59 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 10, 4:11 PM CDT	TSTM WND DMG	Potosi, WI	50+MPH WINDS IN POTOSI, SOME BUILDING DAMAGES REPORTED BY FIRE DEPARTMENT.
Aug 10, 4:28 PM CDT	TSTM WND GST 51	2 Ne Boscobel, WI
Aug 10, 4:31 PM CDT	TSTM WND GST 60	Platteville, WI	POWERLINES BLOWN DOWN.
Aug 10, 4:31 PM CDT	HAIL 0.75	3 Ssw Kieler, WI	REPORT FROM MPING: DIME (0.75 IN.).
Aug 10, 4:32 PM CDT	TSTM WND GST 70	Platteville, 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 10, 2:08 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.9 hours before the alert went out and 145 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: 3755 J/kg
Mixed-layer CIN: -67 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

554 
WUUS53 KARX 102056
SVRARX
IAC005-WIC023-043-103-102200-
/O.NEW.KARX.SV.W.0076.210810T2056Z-210810T2200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
356 PM CDT Tue Aug 10 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  East central Allamakee County in northeastern Iowa...
  Grant County in southwestern Wisconsin...
  Richland County in southwestern Wisconsin...
  Crawford County in southwestern Wisconsin...

* Until 500 PM CDT.

* At 356 PM CDT, severe thunderstorms were located along a line
  extending from 11 miles east of Lansing to 6 miles north of
  Sherrill, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Law enforcement.

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

* Locations impacted include...
  Dubuque, Platteville, Richland Center, Lancaster, Boscobel,
  Fennimore, Cuba City, Muscoda, Hazel Green, Dickeyville,
  Bloomington, Westport, Excelsior, Preston, Georgetown, Lone Rock,
  Seneca, Beetown, Arthur and Rockbridge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4252 9064 4263 9070 4266 9083 4333 9114
      4353 9019 4317 9019 4321 9029 4320 9043
      4251 9043
TIME...MOT...LOC 2056Z 257DEG 35KT 4337 9100 4269 9073 

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

$$

Skow

5 follow-up statements

399 
WWUS53 KARX 102115
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
415 PM CDT Tue Aug 10 2021

IAC005-102125-
/O.CAN.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Allamakee IA-
415 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL ALLAMAKEE 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 800 PM CDT for
southwestern Wisconsin.

LAT...LON 4252 9064 4263 9070 4266 9083 4287 9091
      4306 9085 4335 9105 4353 9019 4317 9019
      4321 9029 4320 9043 4251 9043
TIME...MOT...LOC 2115Z 257DEG 35KT 4341 9078 4273 9051 

$$

WIC023-043-103-102200-
/O.CON.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Grant WI-Richland WI-Crawford WI-
415 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR GRANT...RICHLAND AND EASTERN CRAWFORD COUNTIES...

At 415 PM CDT, severe thunderstorms were located along a line
extending from 11 miles southeast of Viroqua to Platteville, moving
east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement.

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

Locations impacted include...
Dubuque, Platteville, Richland Center, Lancaster, Boscobel,
Fennimore, Cuba City, Muscoda, Hazel Green, Dickeyville, Westport,
Excelsior, Preston, Georgetown, Lone Rock, Seneca, Arthur,
Rockbridge, Montfort and Wauzeka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4252 9064 4263 9070 4266 9083 4287 9091
      4306 9085 4335 9105 4353 9019 4317 9019
      4321 9029 4320 9043 4251 9043
TIME...MOT...LOC 2115Z 257DEG 35KT 4341 9078 4273 9051 

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

$$

Skow

033 
WWUS53 KARX 102129
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
429 PM CDT Tue Aug 10 2021

WIC023-043-103-102200-
/O.CON.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Grant WI-Richland WI-Crawford WI-
429 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR GRANT...RICHLAND AND NORTHEASTERN CRAWFORD COUNTIES...

At 429 PM CDT, severe thunderstorms were located along a line
extending from 9 miles south of La Farge to 6 miles south of Muscoda
to near East Dubuque, moving northeast at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement.

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

Locations impacted include...
Dubuque, Platteville, Richland Center, Lancaster, Boscobel,
Fennimore, Cuba City, Muscoda, Hazel Green, Dickeyville, Westport,
Excelsior, Preston, Georgetown, Lone Rock, Arthur, Rockbridge,
Montfort, Potosi and Livingston.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4252 9064 4263 9070 4266 9083 4288 9075
      4310 9072 4338 9093 4353 9019 4317 9019
      4321 9029 4320 9043 4251 9043
TIME...MOT...LOC 2129Z 245DEG 38KT 4344 9063 4310 9047 4253 9058 

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

$$

Skow

127 
WWUS53 KARX 102137
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
437 PM CDT Tue Aug 10 2021

WIC023-043-103-102200-
/O.CON.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Grant WI-Richland WI-Crawford WI-
437 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR EASTERN GRANT...RICHLAND AND NORTHEASTERN CRAWFORD COUNTIES...

At 435 PM CDT, severe thunderstorms were located along a line
extending from 9 miles south of La Farge to near Muscoda to near
Hazel Green, moving east at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Law enforcement. At 4:32pm, 72 mph winds were reported in 
         Livingston.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Dubuque, Platteville, Richland Center, Fennimore, Cuba City, Muscoda,
Hazel Green, Dickeyville, Westport, Excelsior, Preston, Georgetown,
Lone Rock, Arthur, Rockbridge, Montfort, Potosi, Livingston,
Centerville and Avoca.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4252 9064 4263 9070 4265 9076 4285 9067
      4311 9062 4341 9078 4353 9019 4317 9019
      4321 9029 4320 9043 4251 9043
TIME...MOT...LOC 2135Z 257DEG 35KT 4345 9058 4311 9042 4254 9053 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Skow

269 
WWUS53 KARX 102144
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
444 PM CDT Tue Aug 10 2021

WIC023-102154-
/O.CAN.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Crawford WI-
444 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN 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 800 PM CDT for
southwestern Wisconsin.

LAT...LON 4264 9072 4284 9054 4312 9053 4343 9066
      4353 9019 4317 9019 4321 9029 4320 9043
      4251 9043 4252 9064 4263 9070
TIME...MOT...LOC 2144Z 257DEG 35KT 4347 9048 4313 9032 4256 9043 

$$

WIC043-103-102200-
/O.CON.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Grant WI-Richland WI-
444 PM CDT Tue Aug 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR EASTERN GRANT AND RICHLAND COUNTIES...

At 444 PM CDT, severe thunderstorms were located along a line
extending from 10 miles northwest of Richland Center to 7 miles
southeast of Muscoda to Hazel Green, moving east at 40 mph.

HAZARD...70 mph wind gusts.

SOURCE...Law enforcement.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Dubuque, Platteville, Richland Center, Cuba City, Muscoda, Hazel
Green, Dickeyville, Georgetown, Lone Rock, Arthur, Rockbridge,
Montfort, Livingston, Centerville, Avoca, Ithaca, Orion, Sylvan,
Union and Cazenovia.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4264 9072 4284 9054 4312 9053 4343 9066
      4353 9019 4317 9019 4321 9029 4320 9043
      4251 9043 4252 9064 4263 9070
TIME...MOT...LOC 2144Z 257DEG 35KT 4347 9048 4313 9032 4256 9043 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Skow

436 
WWUS53 KARX 102158
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
458 PM CDT Tue Aug 10 2021

WIC043-103-102208-
/O.EXP.KARX.SV.W.0076.000000T0000Z-210810T2200Z/
Grant WI-Richland WI-
458 PM CDT Tue Aug 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN GRANT AND RICHLAND
COUNTIES WILL EXPIRE AT 500 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 800 PM CDT for
southwestern Wisconsin.

Remember, a Severe Thunderstorm Warning still remains in effect for
eastern Richland County until 5:15pm.

LAT...LON 4264 9072 4284 9054 4312 9053 4343 9066
      4353 9019 4317 9019 4321 9029 4320 9043
      4251 9043 4252 9064 4263 9070
TIME...MOT...LOC 2158Z 257DEG 35KT 4350 9032 4316 9016 4259 9027 

$$

Skow

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 10, 2:26 PM CDT	Heat Advisory	ARX	Grant	27 hr
Aug 10, 3:23 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Grant	52 min
Aug 10, 4:57 PM CDT	Severe Thunderstorm Warning	ARX	Richland	18 min
Aug 10, 2:10 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Fayette, Winneshiek	50 min
Aug 10, 2:43 PM CDT	Severe Thunderstorm Warning	ARX	Allamakee, Clayton, Fayette, Winneshiek	62 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Severe Thunderstorm Warnings in Iowa, 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.