Thunderstorms that developed over northwest Minnesota during the evening of June 20th, moved across western Wisconsin during the early morning hours of the 21st. These storms produced large hail and winds strong enough to cause damage. Trees were blown down in the city of La Crosse (La Crosse County) and a pontoon boat was flipped by the high winds on Lake Onalaska (La Crosse County). Most of the hail that fell was penny to nickel sized. Locally heavy rain caused street flooding to occur in the city of La Crosse and a minor mud slide south of Genoa (Vernon County) that covered part of State Highway 35.

Hail in LA CROSSE, WISCONSIN
From 21-JUN-13 05:12:00 to 21-JUN-13 05:12:00 (CST-6)
Location: COUNCIL BAY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MONROE, WISCONSIN
From 21-JUN-13 05:20:00 to 21-JUN-13 05:20:00 (CST-6)
Location: TOMAH
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in LA CROSSE, WISCONSIN
From 21-JUN-13 05:14:00 to 21-JUN-13 05:14:00 (CST-6)
Location: (LSE)LA CROSSE MUNI
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A pontoon boat was flipped upside down on Lake Onalaska.

Thunderstorm Wind in VERNON, WISCONSIN
From 21-JUN-13 05:52:00 to 21-JUN-13 05:52:00 (CST-6)
Location: WESTBY
Magnitude: 60.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines were blown down in Westby.

Flood in LA CROSSE, WISCONSIN
From 21-JUN-13 06:30:00 to 21-JUN-13 08:30:00 (CST-6)
Location: WEST LA CROSSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Locally heavy rain caused street flooding to occur in several locations across the city of La Crosse.

Flash Flood in CRAWFORD, WISCONSIN
From 21-JUN-13 06:35:00 to 21-JUN-13 06:35:00 (CST-6)
Location: PRAIRIE DU CHIEN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Roads in Prairie du Chien were closed as runoff from locally heavy rains produced flooding.

Thunderstorm Wind in GRANT, WISCONSIN
From 21-JUN-13 06:31:00 to 21-JUN-13 06:31:00 (CST-6)
Location: BOSCOBEL ARPT
Magnitude: 50.00 MG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: ASOS

The automatic weather observing equipment at the Boscobel airport measured a wind gust of 58 mph. Trees were blown down in Boscobel from this wind gust.

Thunderstorm Wind in GRANT, WISCONSIN
From 21-JUN-13 06:42:00 to 21-JUN-13 06:42:00 (CST-6)
Location: MUSCODA
Magnitude: 60.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were blown down in Muscoda.

Flood in VERNON, WISCONSIN
From 21-JUN-13 07:00:00 to 21-JUN-13 09:00:00 (CST-6)
Location: CHASEBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Locally heavy rain produced street flooding in Chaseburg, Westby and Viroqua.

Flash Flood in VERNON, WISCONSIN
From 21-JUN-13 07:05:00 to 21-JUN-13 09:00:00 (CST-6)
Location: GENOA
Flood cause: Heavy Rain
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A minor mud slide just south of Genoa covered part of State Highway 35.

Lightning in LA CROSSE, WISCONSIN
From 21-JUN-13 07:13:00 to 21-JUN-13 07:13:00 (CST-6)
Location: HOLMEN
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Social Media

A couple of power poles were struck by lightning in Holmen.

Flood in GRANT, WISCONSIN
From 21-JUN-13 07:24:00 to 21-JUN-13 09:00:00 (CST-6)
Location: BRODTVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Locally heavy rain caused some water to go over State Highway 35 near Patch Grove.

Thunderstorm Wind in GRANT, WISCONSIN
From 21-JUN-13 07:25:00 to 21-JUN-13 07:25:00 (CST-6)
Location: PLATTEVILLE
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several trees were blown down in Platteville.

Thunderstorm Wind in TREMPEALEAU, WISCONSIN
From 21-JUN-13 05:00:00 to 21-JUN-13 05:00:00 (CST-6)
Location: TREMPEALEAU
Magnitude: 55.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Trees and power poles were blown down near Lock and Dam 6 in Trempealeau.

Thunderstorm Wind in BUFFALO, WISCONSIN
From 21-JUN-13 04:07:00 to 21-JUN-13 04:07:00 (CST-6)
Location: MONDOVI
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines were blown down in Mondovi.

Thunderstorm Wind in LA CROSSE, WISCONSIN
From 21-JUN-13 05:23:00 to 21-JUN-13 05:23:00 (CST-6)
Location: LA CROSSE
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Trees and large branches were blown down in the city of La Crosse.