A line of severe thunderstorms, known as a quasi-linear convective system (QLCS), produced six tornadoes and widespread damaging winds across east-central Wisconsin during the late night hours of August 6-7.  The storms formed ahead of a cold front that also produced severe weather in Minnesota and western Wisconsin.
The tornadoes occurred within about 50 minutes--between 12:22 am and 1:10 am CDT.  Hundreds of homes, businesses and farm buildings were damaged. Two injuries occurred at a campground in Waupaca County.  Thousands of trees and power lines were also downed, leaving tens of thousands of people without power. The strongest tornado of the event reached EF2 intensity (winds estimated at 115 to 120 mph). This tornado caused significant damage to a church in New London.
The six tornadoes that occurred on August 7 were the most nighttime tornadoes in a single event in northeast Wisconsin since accurate tornado records began (1950).

Tornado in KEWAUNEE, WISCONSIN
From 07-AUG-13 00:06:00 to 07-AUG-13 00:10:00 (CST-6)
Location: PILSEN
Tornado F-scale: EF1
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that formed in Brown County at 12:59 am CDT continued east-southeast into Kewaunee County, crossing the county line 2.9 miles southwest of Pilsen at 1:06 am CDT. The tornado caused the walls and roof of a barn to collapse (DI 1, DOD 6) and damaged the tops of two silos. In addition, the tornado damaged and uprooted several dozen trees along its path. Average path width in Kewaunee County was 75 yards.

Tornado in BROWN, WISCONSIN
From 06-AUG-13 23:59:00 to 07-AUG-13 00:06:00 (CST-6)
Location: PINE GROVE
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado formed in eastern Brown County at 12:59 am CDT and moved east-southeast into Kewaunee County. A couple dozen trees were damaged and uprooted (DI 28, DOD 2 and 3) before it moved into Kewaunee County at about 1:06 am CDT, 2.9 miles southwest of Pilsen. Average path width in Brown County was 75 yards.

Tornado in BROWN, WISCONSIN
From 06-AUG-13 23:49:00 to 06-AUG-13 23:50:00 (CST-6)
Location: HOLLAND
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that touched down in Outagamie County, 3.5 miles east of Greenville at 12:38 am CDT, briefly moved across far southwest Brown County near Holland. A few trees were knocked over by the tornado in Brown County (DI 28, DOD 3). The average path width was 150 yards. The tornado then moved into Calumet County at 12:50 am CDT.

Tornado in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:38:00 to 06-AUG-13 23:49:00 (CST-6)
Location: GREENVILLE
Tornado F-scale: EF1
Property damage: 10.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado formed near Highway 41 northwest of Appleton and moved east across northern portions of Appleton, Kimberly and Kaukauna. The tornado caused some roof damage to the Northland Mall (DI 11, DOD 2) and caused roof and window damage to two small retail buildings (DI 8, DOD 3 and 4). The storm then knocked over four wood electrical poles (DI 24, DOD 2 and 3) and uprooted or heavily damaged hundreds of trees in a nearby neighborhood (DI 27, DOD 2 and 3; DI 28, DOD 2 and 3). Although the houses in the area sustained relatively minor wind damage directly, fallen trees caused considerable collateral damage to roofs, siding and vehicles. The tornado exited Outagamie County about four miles east-southeast of Kaukauna at 12:49 am CDT and continued east into far southwest Brown County, then into northern Calumet County. The average path width in Outagamie County was 125 yards.

Tornado in CALUMET, WISCONSIN
From 06-AUG-13 23:50:00 to 06-AUG-13 23:52:00 (CST-6)
Location: FOREST JCT
Tornado F-scale: EF1
Property damage: 200.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that formed in Outagamie County 3.5 miles east of Greenville at 12:38 am CDT, and briefly moved across Brown County, entered Calumet County 1.6 miles north of Forest Junction at 12:50 am CDT. The tornado damaged about three dozen trees (DI 28, DOD 3 and 4). Two metal truss towers collapsed under the weight of several high voltage power lines (that weighed two pounds per foot) which were likely moving in unison as their resonance frequency was reached. Engineers that inspected the damage estimated winds of 100 mph. Nearby trees sustained relatively minor damage (DI 28, DOD 2 and 3). The average path width in Calumet County was 125 yards.

Thunderstorm Wind in WOOD, WISCONSIN
From 06-AUG-13 22:30:00 to 06-AUG-13 22:30:00 (CST-6)
Location: MARSHFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Scattered trees were blown down which caused power outages in the city of Marshfield.

Tornado in WAUPACA, WISCONSIN
From 06-AUG-13 23:24:00 to 06-AUG-13 23:25:00 (CST-6)
Location: NEW LONDON
Tornado F-scale: EF2
Property damage: 1.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

Another fast-moving tornado formed within a line of severe thunderstorms and raced to the southeast. The tornado struck a church, causing severe damage (DI 9, DOD 6 and 7). A large portion of the roof collapsed, causing failure of two walls. A wall on a new portion of the church was pushed in. In addition, hundreds of trees were snapped or uprooted. Several homes along the path sustained damage, mainly from fallen trees. The tornado exited Waupaca County about one mile south of New London at about 12:25 am CDT. The average path width in Waupaca County was 100 yards.

Tornado in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:25:00 to 06-AUG-13 23:33:00 (CST-6)
Location: NEW LONDON
Tornado F-scale: EF1
Property damage: 2.50M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that struck Waupaca County at 12:24 am CDT entered Outagamie County about a mile south of New London at 12:25 am CDT. The tornado damaged or uprooted several hundred trees (DI 27, DOD 3 and 4; DI 28, DOD 3 and 4) along the path, many falling on houses in a two block area of Hortonville, causing considerable roof and siding damage. The average path width in Outagamie County was approximately 100 yards.

Tornado in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:26:00 to 06-AUG-13 23:30:00 (CST-6)
Location: NEW LONDON
Tornado F-scale: EF1
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that touched down in Waupaca County at 12:22 am CDT crossed the Outagamie County line 3.1 miles south of New London at 12:26 am CDT. The tornado quickly moved east-southeast and damaged or uprooted dozens of trees (DI 27, DOD 3 and 4; DI 28, DOD 3 and 4). Based on radar analysis, the circulation of this tornado may have merged with the other tornado that was occurring concurrently in the county near Hortonville. The average path width in Outagamie County was 75 yards.

Thunderstorm Wind in MARINETTE, WISCONSIN
From 06-AUG-13 23:28:00 to 06-AUG-13 23:28:00 (CST-6)
Location: MARINETTE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm winds knocked down trees and power lines in the city of Marinette.

Thunderstorm Wind in WAUSHARA, WISCONSIN
From 06-AUG-13 23:15:00 to 06-AUG-13 23:15:00 (CST-6)
Location: WILD ROSE
Magnitude: 65.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm winds blew down several dozen trees in Wild Rose. Several houses were damaged by the fallen trees. In addition, some roads become impassable over northern and eastern sections of Waushara County due to downed trees.

Tornado in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:40:00 to 06-AUG-13 23:48:00 (CST-6)
Location: MACKVILLE
Tornado F-scale: EF1
Property damage: 1.50M
Reported by: NWS Storm Survey

Another fast-moving tornado developed within a line of severe thunderstorms and moved east-southeast across the Fox Valley. The tornado caused significant damage to several outbuildings and barns (DI 1, DOD 6 and 7) and flattened sections of mature corn fields. The roof of a power substation was damaged (similar to DI 9, DOD 5) southwest of Freedom. The average path width of the tornado in Outagamie County was 150 yards. The tornado moved into Brown County near Highway 41, 1.8 miles northwest of Wrightstown, at 12:48 am CDT.

Tornado in WAUPACA, WISCONSIN
From 06-AUG-13 23:22:00 to 06-AUG-13 23:26:00 (CST-6)
Location: PARTRIDGE LAKE
Tornado F-scale: EF1
Property damage: 25.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado formed just after 12:20 am CDT and quickly moved east-southeast. The storm hit a campground, blowing several camper trailers over. Two people sustained minor injuries at the campground. Over 100 trees were snapped or uprooted along the path of the tornado (DI 27, DOD 3 and 4; DI 28, DOD 3 and 4). The tornado moved into Outagamie County about 3.1 miles south of New London at 12:26 am CDT. The average path width of the tornado in Waupaca County was 75 yards.

Thunderstorm Wind in MANITOWOC, WISCONSIN
From 07-AUG-13 00:05:00 to 07-AUG-13 00:05:00 (CST-6)
Location: KELLNERSVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported scattered trees down in the town of Kellnersville.

Thunderstorm Wind in MANITOWOC, WISCONSIN
From 07-AUG-13 00:13:00 to 07-AUG-13 00:13:00 (CST-6)
Location: MISHICOT
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported that many trees and powerlines were blown down in the town of Mishicot. This caused the power to go out in the town.

Thunderstorm Wind in CALUMET, WISCONSIN
From 06-AUG-13 23:44:00 to 06-AUG-13 23:44:00 (CST-6)
Location: DARBOY
Magnitude: 76.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a measured wind gust of 86 mph at the intersection of County Highway N and County Highway KK, about 3 miles east-northeast of the town of Darboy.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:44:00 to 06-AUG-13 23:44:00 (CST-6)
Location: GREENVILLE
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

A wind gust of 59 mph was recorded by the automated weather observing system at the Outagamie County Airport.

Thunderstorm Wind in MANITOWOC, WISCONSIN
From 07-AUG-13 00:04:00 to 07-AUG-13 00:04:00 (CST-6)
Location: MARIBEL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A semi-trailer was blown over on Interstate 43, north of County Road Z. This report was relayed by television station WLUK.

Thunderstorm Wind in MANITOWOC, WISCONSIN
From 07-AUG-13 00:18:00 to 07-AUG-13 00:18:00 (CST-6)
Location: TWO RIVERS
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

The public reported that many trees and powerlines were knocked down on the north side of Two Rivers.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:47:00 to 06-AUG-13 23:47:00 (CST-6)
Location: APPLETON
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A measured wind gust of 67 mph was reported at Lawrence University, in the city of Appleton.

Tornado in MANITOWOC, WISCONSIN
From 07-AUG-13 00:01:00 to 07-AUG-13 00:10:00 (CST-6)
Location: ROSECRANS
Tornado F-scale: EF1
Property damage: 100.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that initially formed in Outagamie County 2.7 miles east-northeast of Mackville at 12:40 am CDT, and moved across Brown County and the Fox Valley, entered Manitowoc County about 4.1 miles northwest of Rosecrans at 1:01 am CDT. The tornado damaged several outbuildings (DI 1, DOD 3; DI 1, DOD 4) and damaged the roof of a barn (DI 1, DOD 2). A 110 year old stone structure at the Maribel Caves County Park was knocked over by the strong winds. Hundreds of trees were damaged or uprooted along the path of the tornado (DI 27, DOD 2 and 3; DI 28, DOD 3 and 4). The damage survey revealed the tornado ended a couple miles east of Maribel, but straight-line wind damage continued into the eastern part of the county. The average path width of the tornado in Manitowoc County was 125 yards.

Tornado in BROWN, WISCONSIN
From 06-AUG-13 23:48:00 to 07-AUG-13 00:01:00 (CST-6)
Location: WRIGHTSTOWN
Tornado F-scale: EF0
Property damage: 2.00M
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that developed 2.7 miles east-northeast of Mackville in Outagamie County at 12:40 am CDT moved into Brown County, entering near Highway 41, 1.8 miles northwest of Wrightstown, at 12:48 am CDT. The tornado first hit the Apple Creek Campground, snapping 50 trees and knocking over two camping trailers. As the tornado moved across the southern part of the county, at least 70 homes sustained at least minor damage, many from fallen trees (DI 27, DOD 3 and 4; DI 28, DOD 3 and 4). A large, free-standing garage was heavily damaged when the tornadic winds blew in two garage doors, causing the roof to be ripped off (DI 1, DOD 5). The tornado entered Manitowoc County 4.1 miles northwest of Rosecrans at 1:01 am CDT. Average path width of the tornado in Brown County was 175 yards.

Thunderstorm Wind in BROWN, WISCONSIN
From 07-AUG-13 00:08:00 to 07-AUG-13 00:08:00 (CST-6)
Location: DENMARK
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A measured wind gust of 59 mph was recorded in the town of Denmark.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:41:00 to 06-AUG-13 23:41:00 (CST-6)
Location: KIMBERLY
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A measured wind gust of 61 mph was recorded just east of the city of Appleton.

Tornado in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:38:00 to 06-AUG-13 23:48:00 (CST-6)
Location: MACKVILLE
Tornado F-scale: EF1
Property damage: 1.50M
Crop damage: 0.00K
Reported by: NWS Storm Survey

A tornado developed near Mackville and moved rapidly to the east-southeast. The tornado caused a barn to collapse (DI 1, DOD 6) and heavily damaged a boat showroom (DI 21, DOD 3) just north of Little Chute. Another barn lost part of its roof (DI 1, DOD 4) northwest of Kaukauna. Damage to trees was sporadic as the tornado moved out of Outagamie County into Brown County, about two miles southwest of Wrightstown, at 12:48 am CDT. The average path width in Outagamie County was 100 yards.

Thunderstorm Wind in WAUPACA, WISCONSIN
From 06-AUG-13 23:12:00 to 06-AUG-13 23:12:00 (CST-6)
Location: KING
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

The public reported trees and powerlines down in the town of King, or just southwest of the city of Waupaca. A few trees fell on homes.

Tornado in BROWN, WISCONSIN
From 06-AUG-13 23:48:00 to 06-AUG-13 23:53:00 (CST-6)
Location: WRIGHTSTOWN
Tornado F-scale: EF1
Property damage: 500.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

The tornado that formed in Outagamie County near Mackville at 12:38 am CDT entered Brown County about two miles southwest of Wrightstown at 12:48 am CDT. The tornado snapped or uprooted dozens of trees as it moved east, just south of Greenleaf. A house lost an attached garage when winds blew in the garage door and caused a large portion of the garage roof to lift off (DI 2, DOD 4). The walls of a nearby outbuilding collapsed (DI 1, DOD 6). The tornado dissipated about 3 miles west of Morrison. The average path width of the tornado in Brown County was 125 yards.

Thunderstorm Wind in OUTAGAMIE, WISCONSIN
From 06-AUG-13 23:34:00 to 06-AUG-13 23:34:00 (CST-6)
Location: HORTONVILLE
Magnitude: 76.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A severe thunderstorm produced a wind gust of 87 mph just southeast of Hortonville.

Thunderstorm Wind in WAUPACA, WISCONSIN
From 06-AUG-13 23:15:00 to 06-AUG-13 23:15:00 (CST-6)
Location: WAUPACA
Magnitude: 65.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

An estimated wind gust of 75 mph was reported just east of the city of Waupaca.

Thunderstorm Wind in MANITOWOC, WISCONSIN
From 07-AUG-13 00:12:00 to 07-AUG-13 00:12:00 (CST-6)
Location: MISHICOT
Magnitude: 68.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A measured wind gust of 78 mph was reported just west of the town of Mishicot.