Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS La Crosse, WI

July 6, 2021Winona County, Minnesota; La Crosse County, Trempealeau County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jul 6, 2021, 3:33 PM CDT for Winona County, Minnesota; La Crosse County, Trempealeau County, Wisconsin. It was in force for 42 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: Jul 6, 2021, 3:33 PM CDT (20:33 UTC)
Expired: Jul 6, 2021, 4:15 PM CDT
In force: 42 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 0.88 in
Wind: 60.0 mph

Counties Winona County, MN, La Crosse County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 25 km from the middle of the area, began a volume at 20:33 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
Jul 6, 3:52 PM CDT	TSTM WND DMG	4 Ne New Amsterdam, WI	SEVERAL LARGE TREES DOWN ON HOLSETH RD.
Jul 6, 4:00 PM CDT	TSTM WND DMG	4 Nne New Amsterdam, WI	LARGE TREE DOWN ON SYLVESTER RD. TIME ESTIMATED FROM RADAR.
Jul 6, 4:09 PM CDT	TSTM WND DMG	Stevenstown, WI	SEVERAL TREES DOWN, TIME ESTIMATED WITH RADAR.

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
Jul 6, 2:01 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.6 hours before the alert went out and 200 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: 214 J/kg
Mixed-layer CIN: -106 J/kg
Mixed-layer LCL: 1752 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 17 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

933 
WUUS53 KARX 062033
SVRARX
MNC169-WIC063-121-062115-
/O.NEW.KARX.SV.W.0049.210706T2033Z-210706T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
333 PM CDT Tue Jul 6 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  East central Winona County in southeastern Minnesota...
  Northwestern La Crosse County in west central Wisconsin...
  South central Trempealeau County in west central Wisconsin...

* Until 415 PM CDT.

* At 333 PM CDT, a severe thunderstorm was located over Trempealeau,
  or 10 miles east of Winona, moving east at 20 mph.

  HAZARD...60 mph wind gusts and nickel size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Brice Prairie around 355 PM CDT.
  Onalaska and Holmen around 410 PM CDT.

Other locations impacted by this severe thunderstorm include County
Roads M And W, New Amsterdam, Perrot State Park, Stevenstown, Council
Bay, Midway and Lock And Dam 6.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4400 9154 4407 9151 4405 9108 4388 9124
TIME...MOT...LOC 2033Z 281DEG 18KT 4402 9146 

HAIL...0.88IN
WIND...60MPH
 
$$

Skow

3 follow-up statements

674 
WWUS53 KARX 062048
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
348 PM CDT Tue Jul 6 2021

MNC169-062058-
/O.CAN.KARX.SV.W.0049.000000T0000Z-210706T2115Z/
Winona MN-
348 PM CDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL WINONA COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern Minnesota...and west central Wisconsin.

LAT...LON 4405 9108 4388 9124 4396 9141 4400 9143
      4401 9146 4407 9147
TIME...MOT...LOC 2048Z 280DEG 19KT 4400 9134 

$$

WIC063-121-062115-
/O.CON.KARX.SV.W.0049.000000T0000Z-210706T2115Z/
La Crosse WI-Trempealeau WI-
348 PM CDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR NORTHWESTERN LA CROSSE AND SOUTH CENTRAL TREMPEALEAU COUNTIES...

At 348 PM CDT, a severe thunderstorm was located near Brice Prairie,
or 12 miles north of La Crescent, moving east at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe storm will be near...
  Onalaska and Holmen around 405 PM CDT.

Other locations impacted by this severe thunderstorm include County
Roads M And W, Council Bay, Midway, Camp Decorah, New Amsterdam and
Stevenstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4405 9108 4388 9124 4396 9141 4400 9143
      4401 9146 4407 9147
TIME...MOT...LOC 2048Z 280DEG 19KT 4400 9134 

HAIL...1.00IN
WIND...60MPH
 
$$

Skow

865 
WWUS53 KARX 062056
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
356 PM CDT Tue Jul 6 2021

WIC063-121-062115-
/O.CON.KARX.SV.W.0049.000000T0000Z-210706T2115Z/
La Crosse WI-Trempealeau WI-
356 PM CDT Tue Jul 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR NORTHWESTERN LA CROSSE AND SOUTH CENTRAL TREMPEALEAU COUNTIES...

At 356 PM CDT, a severe thunderstorm was located near Holmen, or 12
miles north of La Crosse, moving east at 25 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This severe thunderstorm will remain over mainly rural areas of
northwestern La Crosse and south central Trempealeau Counties,
including the following locations... County Roads M And W, Council
Bay, Camp Decorah, New Amsterdam and Stevenstown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4393 9119 4396 9140 4400 9143 4401 9146
      4407 9147 4405 9108
TIME...MOT...LOC 2056Z 277DEG 21KT 4400 9119 

TORNADO...POSSIBLE
HAIL...1.25IN
WIND...60MPH
 
$$

Skow

983 
WWUS53 KARX 062112
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
412 PM CDT Tue Jul 6 2021

WIC063-121-062121-
/O.EXP.KARX.SV.W.0049.000000T0000Z-210706T2115Z/
La Crosse WI-Trempealeau WI-
412 PM CDT Tue Jul 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN LA CROSSE AND
SOUTH CENTRAL TREMPEALEAU COUNTIES WILL EXPIRE AT 415 PM CDT...
        
The storm which prompted the warning has 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
southeastern Minnesota...and west central Wisconsin.

Remember, a Tornado Warning still remains in effect for La Crosse 
County until 4:45pm. 

LAT...LON 4393 9119 4396 9140 4400 9143 4401 9146
      4407 9147 4405 9108
TIME...MOT...LOC 2111Z 281DEG 18KT 4399 9109 

$$

Skow

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 6, 3:30 PM CDT	Special Weather Statement	ARX	Winona	30 min
Jul 6, 4:51 PM CDT	Special Weather Statement	ARX	Wabasha	24 min
Jul 6, 5:03 PM CDT	Special Weather Statement	ARX	Wabasha	27 min
Jul 6, 5:13 PM CDT	Special Weather Statement	ARX	Winona	32 min
Jul 6, 5:20 PM CDT	Special Weather Statement	ARX	Wabasha	25 min
Jul 6, 1:37 PM CDT	Special Weather Statement	ARX	Buffalo	53 min
Jul 6, 2:01 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	21 min
Jul 6, 3:23 PM CDT	Severe Thunderstorm Warning	ARX	Clark	52 min
Jul 6, 4:01 PM CDT	Tornado Warning	ARX	Jackson, La Crosse, Monroe	17 min
Jul 6, 5:01 PM CDT	Special Weather Statement	ARX	Wood	29 min
Jul 6, 5:43 PM CDT	Special Weather Statement	ARX	La Crosse	32 min
Jul 6, 6:05 PM CDT	Special Weather Statement	ARX	Buffalo	25 min
Jul 6, 6:40 PM CDT	Special Weather Statement	ARX	Buffalo	35 min

Nearby

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