Severe thunderstorms formed as a strong upper level low pressure system moved across Wisconsin.

Tornado in CALUMET, WISCONSIN
From 23-AUG-11 20:05:00 to 23-AUG-11 20:06:00 (CST-6)
Location: SHERWOOD
Tornado F-scale: EF0
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado struck less than a mile northeast of Sherwood at 9:05 PM CDT.  The EF0 tornado toppled two trees that damaged the roof of a house and snapped or uprooted six pine trees near Highway M.  The tornado continued east-southeast, moving over a swamp, where swirl marks were seen in the thick swamp grass.  The tornado then hit a farm on Kesler Road.  Two old barns were heavily damaged (DI 1, DOD 5, 6 -- lower bound due to condition of structures).  Peak winds were estimated near 85 mph.  Average path width of the tornado was 75 yards.

Funnel Cloud in WOOD, WISCONSIN
From 23-AUG-11 16:38:00 to 23-AUG-11 16:38:00 (CST-6)
Location: BAKERVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was spotted near CR-B and CR-BB, southwest of Marshfield.

Funnel Cloud in SHAWANO, WISCONSIN
From 23-AUG-11 17:48:00 to 23-AUG-11 17:48:00 (CST-6)
Location: NAVARINO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A funnel cloud was spotted over Navarino, moving east.

Hail in CALUMET, WISCONSIN
From 23-AUG-11 20:10:00 to 23-AUG-11 20:10:00 (CST-6)
Location: FOREST JCT
Magnitude: 1.00 
Reported by: Law Enforcement

Quarter size hail fell near Forest Junction.

Thunderstorm Wind in WOOD, WISCONSIN
From 23-AUG-11 17:12:00 to 23-AUG-11 17:12:00 (CST-6)
Location: BLENKER
Magnitude: 50.00 EG
Reported by: Law Enforcement

Thunderstorm winds downed trees along CR-H.

Tornado in SHAWANO, WISCONSIN
From 23-AUG-11 17:56:00 to 23-AUG-11 17:57:00 (CST-6)
Location: BRIARTON
Tornado F-scale: EF0
Property damage: 0.00K
Reported by: NWS Storm Survey

A brief tornado, rated EF0, touched down in a field near Briarton shortly before 7:00 pm CDT along Shady Road in Shawano County, just north of the Outagamie County line.  Tall grass and hay in a field was flattened in a cyclonic pattern.  In addition, about a dozen trees had snapped limbs (DI 28, DOD 1, 2).  Peak winds were estimated at 65 to 70 mph. The average path width was about 50 yards.

Hail in WOOD, WISCONSIN
From 23-AUG-11 16:04:00 to 23-AUG-11 16:04:00 (CST-6)
Location: MARSHFIELD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Nickel size hail fell in Marshfield.  Time of event is estimated.

Thunderstorm Wind in SHAWANO, WISCONSIN
From 23-AUG-11 17:12:00 to 23-AUG-11 17:12:00 (CST-6)
Location: GRESHAM
Magnitude: 50.00 EG
Reported by: Law Enforcement

Thunderstorm winds downed trees in Red Springs Township.

Thunderstorm Wind in LINCOLN, WISCONSIN
From 23-AUG-11 16:05:00 to 23-AUG-11 16:05:00 (CST-6)
Location: TOMAHAWK
Magnitude: 50.00 EG
Reported by: Law Enforcement

Thunderstorm winds caused power outages in Tomahawk as large tree limbs fell on power lines.

Lightning in SHAWANO, WISCONSIN
From 23-AUG-11 18:00:00 to 23-AUG-11 18:00:00 (CST-6)
Location: HOFA PARK
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Newspaper

A house in the Town of Maple Grove was struck by lightning, causing a fire that destroyed its second floor.  Time and damage total are estimates.

Lightning in MARATHON, WISCONSIN
From 23-AUG-11 17:10:00 to 23-AUG-11 17:10:00 (CST-6)
Location: (AUW)WAUSAW MUNI ARP
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning struck a business in Wausau causing minor damage to the roof of the building.   Damage total is an estimate.

Tornado in WOOD, WISCONSIN
From 23-AUG-11 16:58:00 to 23-AUG-11 16:58:00 (CST-6)
Location: ARPIN
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A brief tornado, witnessed by local law enforcement, touched down for less than 10 seconds in a corn field.  A couple stalks of corn where thrown in the air, but no damage was reported.  The tornado was rated EF0 with winds around 60 mph.