A line of storms rolled across western Wisconsin during the late afternoon and evening of September 20th ahead of a cold front. These storms produced an EF1 tornado that moved across rural areas of northern Trempealeau County. The tornado flipped a semi as it crossed State Highway 93 injuring the driver and then went on to destroy several farm outbuildings and damaged two homes south of Strum (Trempealeau County). The storms also blew down trees near Mindoro (La Crosse County), White Creek (Adams County) and Friendship (Adams County) and removed the roof off a shed west of Bloom City (Richland County).

Tornado in TREMPEALEAU, WISCONSIN
From 20-SEP-21 16:56:00 to 20-SEP-21 17:11:00 (CST-6)
Location: RUSSELL
Tornado F-scale: EF1
Property damage: 450.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An EF1 tornado touched down north of Independence and moved northeast for eight miles before dissipating south of Strum. Along the path of the tornado, several farm outbuildings were damaged or destroyed with a couple of houses also sustaining damage. As the tornado crossed State Highway 93 it flipped over a semi with the driver sustaining some injuries.

Thunderstorm Wind in TREMPEALEAU, WISCONSIN
From 20-SEP-21 16:47:00 to 20-SEP-21 16:47:00 (CST-6)
Location: INDEPENDENCE
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A 70 mph wind gust was measured in Independence by a private weather station.

Thunderstorm Wind in LA CROSSE, WISCONSIN
From 20-SEP-21 17:19:00 to 20-SEP-21 17:19:00 (CST-6)
Location: (LSE)LA CROSSE MUNI
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The automated weather observing equipment at the La Crosse airport measured a wind gust of 58 mph.

Thunderstorm Wind in LA CROSSE, WISCONSIN
From 20-SEP-21 17:33:00 to 20-SEP-21 17:33:00 (CST-6)
Location: BURR OAK
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Trees were blown down east of Mindoro.

Thunderstorm Wind in GRANT, WISCONSIN
From 20-SEP-21 18:16:00 to 20-SEP-21 18:16:00 (CST-6)
Location: BOSCOBEL
Magnitude: 45.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A tree was was started on fire when it was blown onto a power line.

Thunderstorm Wind in RICHLAND, WISCONSIN
From 20-SEP-21 18:20:00 to 20-SEP-21 18:20:00 (CST-6)
Location: VIOLA
Magnitude: 45.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A roof was blown off a shed west of Bloom City.

Funnel Cloud in VERNON, WISCONSIN
From 20-SEP-21 18:30:00 to 20-SEP-21 18:30:00 (CST-6)
Location: HILLSBORO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A funnel cloud was sighted north of Hillsboro.

Thunderstorm Wind in ADAMS, WISCONSIN
From 20-SEP-21 19:22:00 to 20-SEP-21 19:22:00 (CST-6)
Location: FRNDSHP ADAMS CO ARP
Magnitude: 35.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down east of Friendship.

Thunderstorm Wind in ADAMS, WISCONSIN
From 20-SEP-21 19:13:00 to 20-SEP-21 19:13:00 (CST-6)
Location: WHITE CREEK
Magnitude: 45.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down northeast of White Creek.