A strong early Spring cold front moved across eastern Minnesota during the afternoon of Sunday, April 10th. Ahead of this cold front, strong southerly winds and instability made for a moderate risk of severe weather based the Storm Prediction Center and atmospheric dynamics. After 2 pm, a few supercells developed rapidly from Red Wing, Minnesota, northward across Menomonie and Rice Lake, Wisconsin. These supercells rapidly became severe and started to produce large hail. One of the thunderstorms produced two EF-1 tornadoes near Augusta. These storms quickly moved out of west central Wisconsin by 6 pm.

Thunderstorm Wind in EAU CLAIRE, WISCONSIN
From 10-APR-11 16:05:00 to 10-APR-11 16:06:00 (CST-6)
Location: AUGUSTA
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Park/Forest Service

This was measured by the Fire Weather RAWS site.

Thunderstorm Wind in EAU CLAIRE, WISCONSIN
From 10-APR-11 15:55:00 to 10-APR-11 16:06:00 (CST-6)
Location: STRADER
Magnitude: 78.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A large area of downburst winds, with gusts of 90 mph, occurred north of Osseo, northward along County Road R, then northeast to around Augusta, Wisconsin, and  accompanied the two EF-1 tornadoes near Augusta. A farmstead just east of County Road R, and north of Osseo, was heavily damaged. In addition, several outbuildings were damaged, along with numerous power poles and trees snapped from the damaging downburst path that was estimated between 10 to 12 miles long. Some homes had minor damage to shingles.

Funnel Cloud in EAU CLAIRE, WISCONSIN
From 10-APR-11 15:41:00 to 10-APR-11 15:43:00 (CST-6)
Location: FOSTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a funnel cloud near Foster, Wisconsin.

Hail in DUNN, WISCONSIN
From 10-APR-11 15:12:00 to 10-APR-11 15:12:00 (CST-6)
Location: DUNNVILLE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CHIPPEWA, WISCONSIN
From 10-APR-11 15:36:00 to 10-APR-11 15:36:00 (CST-6)
Location: BLOOMER MUNI ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, WISCONSIN
From 10-APR-11 15:35:00 to 10-APR-11 15:35:00 (CST-6)
Location: IRVINGTON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in PIERCE, WISCONSIN
From 10-APR-11 14:35:00 to 10-APR-11 14:37:00 (CST-6)
Location: SPRING VALLEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in DUNN, WISCONSIN
From 10-APR-11 15:20:00 to 10-APR-11 15:20:00 (CST-6)
Location: ELK MOUND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Hail in DUNN, WISCONSIN
From 10-APR-11 15:21:00 to 10-APR-11 15:21:00 (CST-6)
Location: ELK MOUND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, WISCONSIN
From 10-APR-11 15:22:00 to 10-APR-11 15:22:00 (CST-6)
Location: ELK MOUND
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in DUNN, WISCONSIN
From 10-APR-11 15:22:00 to 10-APR-11 15:22:00 (CST-6)
Location: ELK MOUND
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in CHIPPEWA, WISCONSIN
From 10-APR-11 15:45:00 to 10-APR-11 15:45:00 (CST-6)
Location: NEW AUBURN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tornado in EAU CLAIRE, WISCONSIN
From 10-APR-11 15:57:00 to 10-APR-11 16:03:00 (CST-6)
Location: AUGUSTA
Tornado F-scale: EF1
Property damage: 200.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-1 tornado, with maximum wind speeds of 95 to 105 mph occurred from approximately 5 miles southwest of Augusta, to 3.5 miles southwest of Augusta, Wisconsin. Two farmsteads were directly impacted with severe tree damage around the homes. One farmstead had their garage completely destroyed along with a barn heavily damaged.

Tornado in EAU CLAIRE, WISCONSIN
From 10-APR-11 16:04:00 to 10-APR-11 16:06:00 (CST-6)
Location: AUGUSTA
Tornado F-scale: EF1
Property damage: 250.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

An EF-1 tornado, with maximum wind speeds of 90 to 100 mph, occurred along a path from northwest of Augusta to north of Augusta, Wisconsin. Numerous trees and power poles were snapped, along with an outbuilding destroyed, and three other outbuildings significantly damaged.

Hail in CHIPPEWA, WISCONSIN
From 10-APR-11 15:45:00 to 10-APR-11 15:45:00 (CST-6)
Location: NEW AUBURN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in EAU CLAIRE, WISCONSIN
From 10-APR-11 15:52:00 to 10-APR-11 15:58:00 (CST-6)
Location: FALL CREEK
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several reports of penny and quarter size hail fell around Fall Creek, and northeast of Fall Creek.

Hail in EAU CLAIRE, WISCONSIN
From 10-APR-11 16:09:00 to 10-APR-11 16:09:00 (CST-6)
Location: AUGUSTA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in RUSK, WISCONSIN
From 10-APR-11 15:55:00 to 10-APR-11 15:55:00 (CST-6)
Location: WEYERHAEUSER
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement