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.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS GRB wrote it up.
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).
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before the first event at Aug 6, 6:01 PM CST, 4 hours 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREEN BAY WI 701 PM CDT TUE AUG 6 2013 UPDATED AVIATION PORTION FOR 00Z TAF ISSUANCE .SHORT TERM...TONIGHT AND WEDNESDAY ISSUED AT 310 PM CDT TUE AUG 6 2013 MAIN FCST CONCERNS ARE PCPN TRENDS AND SVR TSTM POTENTIAL TONIGHT...AND TEMPERATURES THROUGH THE PERIOD. MSAS SFC ANALYSIS SHOWED LOW PRESSURE OVER SE ND...WITH A WARM FRONT EXTENDING ESE THROUGH CENTRAL MN AND WC WI...AND A COLD FRONT TRAILING SW INTO SD. WV IMAGERY INDICATED A S/W TROF MOVG INTO NW WI...WITH ADDITIONAL SHORT-WAVES IN ND AND SOUTHERN SASK. RADAR SHOWED A SMALL CLUSTER OF TSTMS OVER NW WI... WITH MORE NUMEROUS SHOWERS AND TSTMS OVER EASTERN ND AND NORTHERN MN. SPC HAS ISSUED A TORNADO WATCH FOR MUCH OF CENTRAL MN AND A FEW COUNTIES IN FAR NW/WC WI... FOR THE AREA ALONG AND NORTH OF THE WARM FRONT...WHERE SOME NEW CONVECTION HAS DEVELOPED. ALTHOUGH SOME ISOLD/SCT CONVECTION WILL OCCUR LATE THIS AFTERNOON AND EARLY EVG...EXPECT MOST OF THE PCPN AND TSTM ACTIVITY TO OCCUR FROM MID-EVENING THROUGH THE OVERNIGHT PERIOD. THE COLD FRONT WILL MOVE THROUGH DURING THIS TIME FRAME...ACCOMPANIED BY UPPER LEVEL FORCING FROM A STRONG JET STREAK AND THE NORTH DAKOTA S/W TROF. WILL HAVE LIKELY POPS OVER THE ENTIRE CWA TONIGHT...WITH CATEGORICAL POPS OVER NC WI...WHERE THE BEST UPPER FORCING SHOULD OCCUR. SVR TSTM POTENTIAL IS A TOUGH CALL...AS MUCAPE IS ONLY EXPECTED TO REACH 500-1000 J/KG DURING THE EVENT. ALTHOUGH THE INSTABILITY IS MARGINAL...CANNOT RULE OUT THE SVR THREAT...GIVEN DEEP LAYER SHEAR OF 40-50 KTS...SEASONALLY STRONG WINDS IN THE MID-LEVELS AND SIGNIFICANT SYNOPTIC SCALE FORCING. NOT CONFIDENT ENOUGH TO ADD SVR WORDING TO THE GRIDS/ZFP...BUT WILL MENTION A SLIGHT RISK IN THE HWO THIS EVG AND INTO THE EARLY OVERNIGHT PERIOD. HAVE TAPERED OFF POPS WITH THE PASSAGE OF THE COLD FRONT LATE TONIGHT INTO EARLY WEDNESDAY...WITH A DRY FCST BY 15Z/WEDS. THERE IS SOME CONCERN THAT THE SOUTHERN SASK S/W TROF MAY TRIGGER SOME SHOWERS OVER N WI DURING THE LATE MORNING AND AFTERNOON...BUT COUNTING ON ENOUGH DRYING IN THE MID-LEVELS TO PRECLUDE ADDITIONAL PCPN DEVELOPMENT. USED A BLEND OF THE PREVIOUS FCST AND THE BEST-PERFORMING GUIDANCE SETS FOR TEMPS TONIGHT AND WEDNESDAY. HIGHS TEMPS SHOULD BE ABOUT 5 DEGREES COOLER THAN TODAY...AND HUMIDITY LEVELS WILL BE QUITE LOW FOR THIS TIME OF YEAR. .LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY ISSUED AT 310 PM CDT TUE AUG 6 2013 AN UPPER TROUGH OVER THE NORTH CENTRAL UNITED STATES SHOULD KEEP COOL TEMPERATURES OVER THE REGION THROUGH SUNDAY. A REINFORCING PUSH OF COLDER AIR SHOULD ARRIVE THURSDAY NIGHT ACCOMPANIED BY SCATTERED SHOWERS OR THUNDERSTORMS. THERE ALSO COULD ALSO BE SCATTERED SHOWERS OR THUNDERSTORMS SUNDAY OR SUNDAY NIGHT WITH SOME JET ENERGY MOVING THROUGH THE UPPER TROUGH AND WARM ADVECTION ASSOCIATED WITH DEPARTING SURFACE HIGH. NEITHER OF THESE TWO CHANCES OF PRECIPITATION LOOK ESPECIALLY IMPRESSIVE GIVEN LACK OF GULF MOISTURE OR STRONG FORCING. && .AVIATION...FOR 00Z TAF ISSUANCE ISSUED AT 650 PM CDT TUE AUG 6 2013 THE MAIN AVIATION CONCERN WILL BE TSTM CHANCES TONIGHT...AS A COLD FRONT AND UPPER LEVEL DISTURBANCE MOVE THROUGH THE REGION. BASED ON RADAR TRENDS AND MESO MODELS HAVE ADJUSTED THE TEMPO GROUP FORWARD SLIGHTY FOR WHEN EXPECT BEST CHANCE FOR TSTMS AT TAF SITES. A FEW OF THE STORMS COULD BE STRONG...WITH GUSTY WINDS AND SMALL HAIL. MVFR CONDITIONS SHOULD ACCOMPANY ANY TSTMS...AND LINGER IN THE WAKE OF THE COLD FRONT LATE TONIGHT INTO EARLY WEDNESDAY. CONDITIONS EXPECTED TO IMPROVE TO VFR AT MOST LOCATIONS BY LATE MORNING. NW WINDS WILL INCREASE WEDS MORNING... WITH GUSTS TO 15 TO 20 KTS EXPECTED AT THE TAF SITES. && .GRB WATCHES/WARNINGS/ADVISORIES... NONE. && SHORT TERM.....KIECKBUSCH LONG TERM......RDM AVIATION.......TE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREEN BAY WI 332 PM CDT TUE AUG 6 2013 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-072045- VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE-LINCOLN-LANGLADE- MENOMINEE-NORTHERN OCONTO-DOOR-MARATHON-SHAWANO-WOOD-PORTAGE- WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO-CALUMET- MANITOWOC-SOUTHERN MARINETTE-SOUTHERN OCONTO- 332 PM CDT TUE AUG 6 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST WISCONSIN. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS ACROSS THE ENTIRE FORECAST AREA TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL...ESPECIALLY SOUTHWEST OF A LINE FROM TOMAHAWK TO GREEN BAY BETWEEN 9 PM AND 3 AM. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS IN EAST CENTRAL WISCONSIN EARLY WEDNESDAY MORNING...BUT SEVERE WEATHER IS NOT EXPECTED. THERE WILL ALSO BE A CHANCE OF THUNDERSTORMS THURSDAY NIGHT... AND AGAIN EARLY NEXT WEEK. IT IS TOO EARLY TO DETERMINE IF SEVERE WEATHER WILL OCCUR DURING THESE PERIODS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT. LMZ521-522-541>543-072045- THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN- 332 PM CDT TUE AUG 6 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE MICHIGAN AND THE WATERS OF GREEN BAY. .DAY ONE...TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TONIGHT. ALTHOUGH SEVERE WEATHER IS NOT ANTICIPATED...ISOLATED STRONG THUNDERSTORMS WITH GUSTY WINDS AND SMALL HAIL ARE POSSIBLE LATE THIS EVENING AND OVERNIGHT. PATCHY DENSE MARINE FOG MAY CAUSE NAVIGATION PROBLEMS FOR MARINERS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH TUESDAY THERE IS A CHANCE OF THUNDERSTORMS WEDNESDAY MORNING...WITH MORE STORMS POSSIBLE THURSDAY NIGHT AND AGAIN EARLY NEXT WEEK. THE STORMS COULD PRODUCE GUSTY WINDS WHICH WILL POSE A HAZARD TO BOATERS. TSK/RDM
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 807 PM CDT TUE AUG 6 2013 WIZ005-010-018-070200- LINCOLN-ONEIDA-VILAS- 807 PM CDT TUE AUG 6 2013 ...SIGNIFICANT WEATHER ADVISORY... AT 800 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN AREA OF STRONG THUNDERSTORMS OVER NORTHWEST WISCONSIN NOW BEGINNING TO MOVE INTO VILAS...ONIEDA AND TAYLOR COUNTIES. THE STORMS WERE MOVING SOUTHEAST AT 40 MPH. ONE HALF INCH DIAMETER HAIL...WINDS TO 50 MPH...FREQUENT CLOUD TO GROUND LIGHTNING...ARE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... STAR LAKE... SAYNER... WOODRUFF... ARBOR VITAE... MINOCQUA... ST GERMAIN... HAZELHURST... WILLOW RESERVOIR... HAZELHURST... LAKE TOMAHAWK... TRIPOLI... GOODNOW... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. TE
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1011 PM CDT TUE AUG 6 2013 WIZ018-030-070400- LINCOLN-MARATHON- 1011 PM CDT TUE AUG 6 2013 ...STRONG THUNDERSTORM MOVING INTO FAR SOUTHERN LINCOLN AND FAR NORTHERN MARATHON COUNTY THIS EVENING... AT 1007 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER EAST CENTRAL TAYLOR COUNTY...MOVING EAST AT 35 MPH. NICKEL SIZE HAIL...WINDS UP TO 50 MPH...HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... NEW WOOD WILDLIFE AREA... BILL CROSS RAPIDS WILDLIFE AREA... HAMBURG... COUNCIL GROUNDS STATE PARK... OTIS... PINE RIVER... MERRILL... BROKAW... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. MPC
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1104 PM CDT TUE AUG 6 2013 WIZ011-013-019>021-030-031-037-073-074-070500- FOREST-LANGLADE-MARATHON-MENOMINEE-NORTHERN MARINETTE COUNTY-NORTHERN OCONTO COUNTY-SHAWANO-SOUTHERN MARINETTE COUNTY-SOUTHERN OCONTO COUNTY-WAUPACA- 1104 PM CDT TUE AUG 6 2013 ...STRONG THUNDERSTORMS MOVING OVER NORTHEAST WISCONSIN LATE THIS EVENING... AT 1100 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM IRON MOUNTAIN TO MARSHFIELD...MOVING EAST AT 35 MPH. PENNY SIZE HAIL...WINDS UP TO 50 MPH...ARE POSSIBLE WITH THESE STORMS. LOCATIONS IMPACTED INCLUDE... WAUSAU... STEVENS POINT... ANTIGO... WISCONSIN RAPIDS... SHAWANO... CROOKED LAKE... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. MPC
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREEN BAY WI
1111 PM CDT TUE AUG 06 2013
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1106 PM HAIL 2 ESE BRYANT 45.19N 88.97W
08/06/2013 E0.50 INCH LANGLADE WI TRAINED SPOTTER
A LOT OF HAIL, HEAVY RAIN AND GUSTY WINDS
&&
TERIESPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GREEN BAY WI 1121 PM CDT TUE AUG 6 2013 WIZ030-031-035>037-045-048-070545- MARATHON-PORTAGE-SHAWANO-WAUPACA-WAUSHARA-WINNEBAGO-WOOD- 1121 PM CDT TUE AUG 6 2013 ...STRONG THUNDERSTORMS OVER CENTRAL WISCONSIN... AT 1117 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 36 MILES NORTHEAST OF STEVENS POINT TO 24 MILES WEST OF WISCONSIN RAPIDS...MOVING SOUTHEAST AT 40 MPH. PENNY SIZE HAIL...WINDS UP TO 50 MPH...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THESE STORMS. * THUNDERSTORMS WILL BE NEAR... WISCONSIN RAPIDS AND WHITING BY 1140 PM CDT... AMHERST BY 1155 PM CDT... HARTMAN CREEK STATE PARK BY 1205 AM CDT... WAUPACA AND PLAINFIELD BY 1210 AM CDT... FREMONT BY 1225 AM CDT... WAUTOMA BY 1230 AM CDT... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THESE STORMS HAVE PASSED. TDH
The La Crosse radar (KARX), 124 km away, was scanning. The volume nearest the first event began at 04:30 UTC.
16 thunderstorm wind, 14 tornado. Local standard time, as filed.
Scattered trees were blown down which caused power outages in the city of Marshfield.
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.
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.
An estimated wind gust of 75 mph was reported just east of the city of Waupaca.
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.
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.
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.
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 winds knocked down trees and power lines in the city of Marinette.
A severe thunderstorm produced a wind gust of 87 mph just southeast of Hortonville.
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.
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.
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.
A measured wind gust of 61 mph was recorded just east of the city of Appleton.
A wind gust of 59 mph was recorded by the automated weather observing system at the Outagamie County Airport.
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.
A measured wind gust of 67 mph was reported at Lawrence University, in the city of Appleton.
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.
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.
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.
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.
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.
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.
A semi-trailer was blown over on Interstate 43, north of County Road Z. This report was relayed by television station WLUK.
The public reported scattered trees down in the town of Kellnersville.
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.
A measured wind gust of 59 mph was recorded in the town of Denmark.
A measured wind gust of 78 mph was reported just west of the town of Mishicot.
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.
The public reported that many trees and powerlines were knocked down on the north side of Two Rivers.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Wisconsin in 2013Every state in 2013This day in weather historyThe tornado archive for Wisconsin, 2013Warnings in Wisconsin, August 2013
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 472186, 472201, 472189, 472207, 459677, 459591, 459592, 459688, 472188, 472205, 461834, 461878, 459699, 472199, 472196, 472200, 472197, 459700, 461837, 462236, 462305, 459668, 459710, 472195, 472192, 459669, 472198, 472208, 472193, 472194.