Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 20, NWS La Crosse, WI

September 20, 2021Richland County, Vernon County, Wisconsin

NWS La Crosse, WI issued this tornado warning at Sep 20, 2021, 7:17 PM CDT for Richland County, Vernon County, Wisconsin. It was in force for 28 min. 2 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: Sep 20, 2021, 7:17 PM CDT (00:17 UTC)
Expired: Sep 20, 2021, 7:45 PM CDT
In force: 28 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Richland County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 59 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, 7:20 PM CDT	TSTM WND DMG	3 Se Viola, WI	ROOF BLOWN OFF A SHED.
Sep 20, 7:30 PM CDT	FUNNEL CLOUD	2 N Hillsboro, WI	RELAYED TO VERNON COUNTY DISPATCH.

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 212 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.

116 
WFUS53 KARX 210017
TORARX
WIC103-123-210045-
/O.NEW.KARX.TO.W.0020.210921T0017Z-210921T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
717 PM CDT Mon Sep 20 2021

The National Weather Service in La Crosse has issued a

* Tornado Warning for...
  Eastern Vernon County in southwestern Wisconsin...
  Northwestern Richland County in southwestern Wisconsin...

* Until 745 PM CDT.

* At 717 PM CDT, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located 8
  miles south of La Farge, or 12 miles southeast of Viroqua, moving
  northeast at 50 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* These dangerous storms will be near...
  La Farge around 725 PM CDT.
  Hillsboro around 745 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Rockton, Readstown, Kickapoo Center, Bartons Corners, Sylvan, Liberty
and White City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4342 9063 4342 9078 4345 9081 4372 9054
      4373 9032 4354 9031
TIME...MOT...LOC 0017Z 235DEG 43KT 4345 9068 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Skow

3 follow-up statements

821 
WWUS53 KARX 210027
SVSARX

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

WIC103-123-210045-
/O.CON.KARX.TO.W.0020.000000T0000Z-210921T0045Z/
Vernon WI-Richland WI-
727 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHEASTERN VERNON AND NORTH CENTRAL RICHLAND COUNTIES...

At 727 PM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located near La
Farge, or 16 miles east of Viroqua, moving northeast at 50 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

These dangerous storms will be near...
  Hillsboro around 740 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Benders Corners, Trippville, Yuba, Bartons Corners, Mount Tabor,
Highway 82 And County A and Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4349 9051 4356 9066 4372 9054 4373 9032
      4355 9031
TIME...MOT...LOC 0027Z 231DEG 44KT 4356 9055 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Skow

126 
WWUS53 KARX 210037
SVSARX

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

WIC103-210046-
/O.CAN.KARX.TO.W.0020.000000T0000Z-210921T0045Z/
Richland WI-
737 PM CDT Mon Sep 20 2021

...THE TORNADO WARNING FOR NORTH CENTRAL RICHLAND COUNTY IS
CANCELLED...
    
The tornadic 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
southwestern Wisconsin.

LAT...LON 4355 9043 4366 9058 4372 9054 4373 9032
      4355 9031
TIME...MOT...LOC 0036Z 235DEG 43KT 4363 9042 

$$

WIC123-210045-
/O.CON.KARX.TO.W.0020.000000T0000Z-210921T0045Z/
Vernon WI-
737 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR
NORTHEASTERN VERNON COUNTY...

At 736 PM CDT, a severe squall line capable of producing both
tornadoes and extensive straight line wind damage was located near
Hillsboro, or 20 miles north of Richland Center, moving northeast at
50 mph.

HAZARD...Tornado.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

These dangerous storms will be near...
  Hillsboro around 740 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Benders Corners, Trippville, Bartons Corners, Mount Tabor, Valley,
Dilly and White City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4355 9043 4366 9058 4372 9054 4373 9032
      4355 9031
TIME...MOT...LOC 0036Z 235DEG 43KT 4363 9042 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Skow

924 
WWUS53 KARX 210044
SVSARX

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

WIC123-210054-
/O.EXP.KARX.TO.W.0020.000000T0000Z-210921T0045Z/
Vernon WI-
744 PM CDT Mon Sep 20 2021

...THE TORNADO WARNING FOR NORTHEASTERN VERNON COUNTY WILL EXPIRE AT
745 PM CDT...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.

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

LAT...LON 4355 9043 4366 9058 4372 9054 4373 9032
      4355 9031
TIME...MOT...LOC 0044Z 235DEG 43KT 4368 9033 

$$

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, 7:20 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Grant, Richland	40 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

Tornado Warnings in Wisconsin, 2021 Every tornado warning in 2021 Tornadoes 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.