Two rounds of thunderstorms impacted parts of western and central Wisconsin on September 4th and 5th.  The first event, which was more significant, produced an EF2 tornado outside of Bloomington (Grant County), large hail and damaging winds during the afternoon and evening of the 4th. The tornado demolished or damaged all the buildings on one farm before dissipating. Several trees and a barn were blown down across western Vernon County between Genoa and De Soto. The largest hail reported was golf ball at Genoa and Red Mound (Vernon County). The second round of storms during the early morning hours of the 5th blew down some more trees across western Vernon County.

Hail in VERNON, WISCONSIN
From 04-SEP-12 16:44:00 to 04-SEP-12 16:45:00 (CST-6)
Location: GENOA
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in VERNON, WISCONSIN
From 04-SEP-12 16:46:00 to 04-SEP-12 16:46:00 (CST-6)
Location: VICTORY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GRANT, WISCONSIN
From 04-SEP-12 19:25:00 to 04-SEP-12 19:25:00 (CST-6)
Location: FIVE PTS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Quarter sized hail was reported west of Lancaster.

Thunderstorm Wind in GRANT, WISCONSIN
From 04-SEP-12 20:14:00 to 04-SEP-12 20:14:00 (CST-6)
Location: POTOSI
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees were blown down across a road in Potosi.

Thunderstorm Wind in VERNON, WISCONSIN
From 05-SEP-12 01:00:00 to 05-SEP-12 01:00:00 (CST-6)
Location: VICTORY
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Large trees were blown down across the far western portions of Vernon County.

Hail in LA CROSSE, WISCONSIN
From 04-SEP-12 17:23:00 to 04-SEP-12 17:23:00 (CST-6)
Location: WEST LA CROSSE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in LA CROSSE, WISCONSIN
From 04-SEP-12 17:42:00 to 04-SEP-12 17:42:00 (CST-6)
Location: HERRINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Tornado in GRANT, WISCONSIN
From 04-SEP-12 18:37:00 to 04-SEP-12 18:43:00 (CST-6)
Location: PATCH GROVE
Tornado F-scale: EF2
Property damage: 420.00K
Crop damage: 8.00K
Reported by: Emergency Manager

A slow moving tornado formed on the edge of a passing severe thunderstorm between Patch Grove and Bloomington. The tornado was mainly confined to one landowner near Hickory and Maine Roads in rural Grant County.  Several outbuildings, a barn, and the home were demolished or heavily damaged.  Trees on the property were also sheared off or blown over.  Considering the roof was torn off and several walls were down or damaged, the tornado was rated an EF2 but it's possible the slow movement allowed the tornado to remain nearly stationary long enough to cause worse damage. Interviews by local residents and video evidence suggests the tornado may have moved to the northwest at times as well.

Thunderstorm Wind in CLARK, WISCONSIN
From 04-SEP-12 17:17:00 to 04-SEP-12 17:17:00 (CST-6)
Location: CHILI
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A wind gust of 60 miles per hour was reported in Veefkind.

Heavy Rain in GRANT, WISCONSIN
From 04-SEP-12 18:15:00 to 05-SEP-12 04:20:00 (CST-6)
Location: LANCASTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Just over 3 inches of rain fell in Lancaster during the evening of the 4th into the early morning of the 5th.

Heavy Rain in GRANT, WISCONSIN
From 04-SEP-12 19:35:00 to 05-SEP-12 04:25:00 (CST-6)
Location: ROCKVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

During the evening of the 4th into the early morning hours of the 5th, 3.62 inches of rain fell in Rockville.

Thunderstorm Wind in CLARK, WISCONSIN
From 04-SEP-12 17:04:00 to 04-SEP-12 17:04:00 (CST-6)
Location: GREENWOOD
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trees were blown down near the Post Office in Greenwood.

Thunderstorm Wind in LA CROSSE, WISCONSIN
From 04-SEP-12 17:13:00 to 04-SEP-12 17:13:00 (CST-6)
Location: CALVERT
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Public

Several four inch diameter tree branches were blown down across the Goose Island campground.

Thunderstorm Wind in CLARK, WISCONSIN
From 04-SEP-12 17:17:00 to 04-SEP-12 17:17:00 (CST-6)
Location: CURTISS
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large trees and power lines were blown down along Hi Line Road southwest of Unity.

Thunderstorm Wind in VERNON, WISCONSIN
From 04-SEP-12 17:28:00 to 04-SEP-12 17:45:00 (CST-6)
Location: GENOA
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees were blown down from Genoa to De Soto and locations to the east.

Hail in CRAWFORD, WISCONSIN
From 04-SEP-12 17:42:00 to 04-SEP-12 17:42:00 (CST-6)
Location: PRAIRIE DU CHIEN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Half dollar sized hail fell in Prairie du Chien.

Hail in VERNON, WISCONSIN
From 04-SEP-12 17:51:00 to 04-SEP-12 17:51:00 (CST-6)
Location: RED MOUND
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Up to golf ball sized hail was reported in Red Mound.

Thunderstorm Wind in VERNON, WISCONSIN
From 04-SEP-12 17:51:00 to 04-SEP-12 17:51:00 (CST-6)
Location: RED MOUND
Magnitude: 70.00 EG
Property damage: 35.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A barn and numerous trees were blown down in and around Red Mound in the Wheatland Township. Widespread power outages were also reported.

Hail in GRANT, WISCONSIN
From 04-SEP-12 17:51:00 to 04-SEP-12 17:51:00 (CST-6)
Location: BRODTVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Quarter sized hail fell along County Road P northeast of Bagley.

Thunderstorm Wind in RICHLAND, WISCONSIN
From 04-SEP-12 18:13:00 to 04-SEP-12 18:13:00 (CST-6)
Location: RICHLAND CENTER
Magnitude: 55.00 EG
Property damage: 4.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were blown down on the north edge of Richland Center.

Hail in RICHLAND, WISCONSIN
From 04-SEP-12 18:14:00 to 04-SEP-12 18:14:00 (CST-6)
Location: RICHLAND CENTER
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail up to the size of walnuts was reported northwest of Richland Center.

Thunderstorm Wind in GRANT, WISCONSIN
From 04-SEP-12 18:54:00 to 04-SEP-12 19:05:00 (CST-6)
Location: BAGLEY
Magnitude: 61.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several reports of 70 mile per hour winds were received from Bagley south to Glen Haven and east to Bloomington across the northwest portion of Grant County.

Hail in CRAWFORD, WISCONSIN
From 04-SEP-12 19:13:00 to 04-SEP-12 19:13:00 (CST-6)
Location: PRAIRIE DU CHIEN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in GRANT, WISCONSIN
From 04-SEP-12 19:15:00 to 04-SEP-12 19:15:00 (CST-6)
Location: PATCH GROVE
Magnitude: 1.25 
Property damage: 5.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Half dollar sized hail fell southeast of Patch Grove causing damage to a vehicle.

Thunderstorm Wind in CLARK, WISCONSIN
From 04-SEP-12 17:09:00 to 04-SEP-12 17:09:00 (CST-6)
Location: LOYAL
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Several small trees were blown down in Loyal.