Several rounds of storms moved across western Wisconsin during the afternoon of August 7th. One of these storms produced an EF3 tornado that started in Boscobel (Grant County) and traveled east/southeast before dissipating south of Blue River (Grant County). Along the path of the tornado, 6 homes sustained enough damage to be considered total losses but no injuries occurred. Flash flooding caused a mud slide along State Highway 33 southeast of La Crosse (La Crosse County) and washed out part of County Road NN south of St. Joseph (La Crosse County). Water also covered portions of State Highway 27 and County Roads J and X near Melvina (Monroe County). Coon Creek went out of its banks and caused extensive damage to the baseball field in Coon Valley (Vernon County). A county wide disaster was declared by Vernon County officials because of the flood damage.

Tornado in GRANT, WISCONSIN
From 07-AUG-21 15:29:00 to 07-AUG-21 15:56:00 (CST-6)
Location: BOSCOBEL
Tornado F-scale: EF3
Property damage: 430.00K
Crop damage: 25.00K
Reported by: NWS Storm Survey

A NWS storm survey confirmed that an EF3 tornado occurred across northern Grant County. The tornado started in Boscobel where damage to trees, power poles and power lines occurred. The tornado then moved east/southeast before dissipating south of Blue River. Along the path, six homes sustained enough damage to be considered total losses while numerous other had minor to moderate damage. No injuries were reported.

Hail in LA CROSSE, WISCONSIN
From 07-AUG-21 13:16:00 to 07-AUG-21 13:16:00 (CST-6)
Location: COUNCIL BAY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in LA CROSSE, WISCONSIN
From 07-AUG-21 13:38:00 to 07-AUG-21 13:38:00 (CST-6)
Location: WEST SALEM ARPT
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in RICHLAND, WISCONSIN
From 07-AUG-21 12:49:00 to 07-AUG-21 12:49:00 (CST-6)
Location: YUBA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter sized hail was reported in Yuba.

Hail in VERNON, WISCONSIN
From 07-AUG-21 14:39:00 to 07-AUG-21 14:39:00 (CST-6)
Location: DELL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flash Flood in MONROE, WISCONSIN
From 07-AUG-21 15:00:00 to 07-AUG-21 17:30:00 (CST-6)
Location: LEON
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 7.00K
Reported by: Law Enforcement

Runoff from heavy rains caused flash flooding to occur near Melvina. A creek out of its banks sent water over both lanes of County Road J, a mud and rock slide covered a portion of County Road X and the Little La Crosse River went out its banks spreading water and debris across State Highway 27.

Hail in VERNON, WISCONSIN
From 07-AUG-21 14:38:00 to 07-AUG-21 14:38:00 (CST-6)
Location: ONTARIO
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in CRAWFORD, WISCONSIN
From 07-AUG-21 15:22:00 to 07-AUG-21 15:22:00 (CST-6)
Location: ROLLING GROUND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in GRANT, WISCONSIN
From 07-AUG-21 15:52:00 to 07-AUG-21 15:52:00 (CST-6)
Location: BLUE RIVER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Half dollar sized hail fell south of Blue River.

Flash Flood in VERNON, WISCONSIN
From 07-AUG-21 16:03:00 to 07-AUG-21 18:30:00 (CST-6)
Location: DELL
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 205.00K
Reported by: Public

Runoff from locally heavy rains caused flash flooding to occur across the northern portions of Vernon County. Coon Creek went out of its banks causing extensive damage to the baseball field in Coon Valley. Water got into the basements of some homes as well.

Heavy Rain in LA CROSSE, WISCONSIN
From 07-AUG-21 10:20:00 to 07-AUG-21 15:08:00 (CST-6)
Location: ST JOSEPH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Near St. Joseph, 5.21 inches of rain fell.

Hail in MONROE, WISCONSIN
From 07-AUG-21 17:03:00 to 07-AUG-21 17:03:00 (CST-6)
Location: KENDALL
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Quarter sized hail fell in Kendall.

Flash Flood in LA CROSSE, WISCONSIN
From 07-AUG-21 14:45:00 to 07-AUG-21 17:30:00 (CST-6)
Location: LA CROSSE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 125.00K
Reported by: Law Enforcement

Flash flooding occurred across the southern sections of La Crosse due to runoff from locally heavy rains. A portion of County Road NN was washed out south of Saint Joseph, a mudslide occurred along State Highway 33 in Shelby and boulders were washed into the U.S. Highway 14/61 and State Highway 35 split on the south side of La Crosse.

Hail in LA CROSSE, WISCONSIN
From 07-AUG-21 13:19:00 to 07-AUG-21 13:19:00 (CST-6)
Location: MIDWAY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Quarter sized hail was reported north of Onalaska.

Hail in LA CROSSE, WISCONSIN
From 07-AUG-21 13:23:00 to 07-AUG-21 13:23:00 (CST-6)
Location: HOLMEN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Half dollar sized hail was reported east of Holmen.

Flood in LA CROSSE, WISCONSIN
From 07-AUG-21 13:36:00 to 07-AUG-21 14:45:00 (CST-6)
Location: LA CROSSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Runoff from locally heavy rains caused street flooding to occur on the south side of La Crosse.

Flood in JACKSON, WISCONSIN
From 08-AUG-21 06:55:00 to 08-AUG-21 16:45:00 (CST-6)
Location: VAUDREUIL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rains pushed the Black River out of its banks in Black River Falls. The river crested over a foot above the flood stage at 48.2 feet.

Flood in VERNON, WISCONSIN
From 07-AUG-21 19:01:00 to 07-AUG-21 22:18:00 (CST-6)
Location: ONTARIO
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rains pushed the Kickapoo River out of its banks in Ontario. The river crested over two feet above the flood stage at 18.13 feet.

Flood in VERNON, WISCONSIN
From 07-AUG-21 23:05:00 to 08-AUG-21 22:51:00 (CST-6)
Location: LA FARGE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rains pushed the Kickapoo River out of its banks in La Farge. The river crested crested less than a foot above the flood stage at 12.7 feet on the 8th.

Flood in VERNON, WISCONSIN
From 08-AUG-21 10:00:00 to 09-AUG-21 23:00:00 (CST-6)
Location: KICKAPOO CENTER
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rains pushed the Kickapoo River out of its banks in Viola. The river crested almost three feet above the flood stage at 16.83 feet on the 9th.

Flood in VERNON, WISCONSIN
From 08-AUG-21 02:16:00 to 11-AUG-21 10:46:00 (CST-6)
Location: READSTOWN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rains pushed the Kickapoo River out of its banks in Readstown. The river crested almost three feet above the flood stage at 13.78 on the 9th.

Flood in TREMPEALEAU, WISCONSIN
From 11-AUG-21 04:15:00 to 11-AUG-21 21:20:00 (CST-6)
Location: BUTMAN CORNERS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Runoff from heavy rains pushed the Black River out of its banks near Galesville. The river crested less than a foot above the flood stage at 12.29 feet.

Flood in VERNON, WISCONSIN
From 07-AUG-21 19:00:00 to 08-AUG-21 21:00:00 (CST-6)
Location: LIBERTY
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Runoff from heavy rains pushed the West Fork of the Kickapoo River out of its banks near Liberty. State Highway 56 was reduced to one lane because of the flooding. State Highway 162 was closed in Chaseburg because of flood waters from Coon Creek. Numerous county and township roads and bridges were also impacted or closed from flooding.

Flood in LA CROSSE, WISCONSIN
From 08-AUG-21 12:00:00 to 08-AUG-21 16:00:00 (CST-6)
Location: (LSE)LA CROSSE MUNI
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Following the heavy rains of August 7th, runoff from more rain on the 8th caused flooding to occur on the west side of French Island in the Town of Campbell. The basement wall on one house collapsed allowing water to fill the basement and prompted the evacuation of the residents.