The second of two rounds of severe thunderstorms to affect southern Wisconsin on September 7th struck parts of the south-central and southeast counties in the early evening hours.  A north-south line of  storms moving east through southern Wisconsin generated powerful straight-line downburst winds that toppled many large trees in parts of Iowa, Lafayette, Sauk, Coumbia, Marquette, Green Lake, Dane, Green, Rock, Jefferson, Waukesha, and Walworth Counties.  Scattered power outages were also noted, resulting in the loss of electrical power to about 1000 customers in southeast Wisconsin.  Law enforcement officials and trained spotters estimated wind gusts to be in the 50 to 56 knot range (58 to 65 mph).  However, thunderstorm winds probably topped out around 65 knots (75 mph) in the area about 4 miles southeast of Lake Delton where newspaper accounts indicated that a silo and pole shed were blown down, and other buildings were damaged.  One of the large trees that were toppled in Beloit damaged two vehicles, and trapped passengers in one of them for about one hour.    In addition, heavy rains of 1 to 2 inches accompanied some of the storms, resulting in flooded roads in and around Madison (Dane Co.) and Beloit (Rock Co.).  Water depths on some of Madison's and Beloit's roads were 1 to 2 feet deep in low spots, and several vehicles in Madison stalled.  In Beloit, up to 1.64 inches of rain was measured, while 1.85 inches fell at Madison's Truax Field.  Synoptically, low pressure moved northeast through northwest Wisconsin.  Surface dewpoints were in the lower 70s with maximum air temperatures in the mid 80s.  The individual thunderstorm cells moved northeast at 35 to 43 knots (40 to 50 mph).

Thunderstorm Wind in WALWORTH, WISCONSIN
From 07-SEP-01 19:30:00 to 07-SEP-01 19:45:00 (CST)
Location: WALWORTH
Magnitude: 56 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in DANE, WISCONSIN
From 07-SEP-01 18:10:00 to 07-SEP-01 18:15:00 (CST)
Location: MADISON
Magnitude: 50 E
Reported by: NEWSPAPER

Thunderstorm Wind in MARQUETTE, WISCONSIN
From 07-SEP-01 18:25:00 to 07-SEP-01 18:30:00 (CST)
Location: ENDEAVOR
Magnitude: 52 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 07-SEP-01 18:25:00 to 07-SEP-01 18:25:00 (CST)
Location: BELOIT
Magnitude: 56 E
Property damage: 10K
Reported by: NEWSPAPER

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 07-SEP-01 18:20:00 to 07-SEP-01 18:20:00 (CST)
Location: PORTAGE
Magnitude: 56 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in WAUKESHA, WISCONSIN
From 07-SEP-01 19:40:00 to 07-SEP-01 19:40:00 (CST)
Location: OCONOMOWOC
Magnitude: 52 E
Reported by: LAW ENFORCEMENT

Flood in ROCK, WISCONSIN
From 07-SEP-01 18:20:00 to 07-SEP-01 19:30:00 (CST)
Location: BELOIT
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in SAUK, WISCONSIN
From 07-SEP-01 18:05:00 to 07-SEP-01 18:10:00 (CST)
Location: LAKE DELTON
Magnitude: 65 E
Property damage: 75K
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in LAFAYETTE, WISCONSIN
From 07-SEP-01 17:45:00 to 07-SEP-01 17:58:00 (CST)
Location: BENTON
Magnitude: 56 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in ROCK, WISCONSIN
From 07-SEP-01 18:20:00 to 07-SEP-01 18:20:00 (CST)
Location: EVANSVILLE
Magnitude: 56 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in COLUMBIA, WISCONSIN
From 07-SEP-01 18:55:00 to 07-SEP-01 18:55:00 (CST)
Location: CAMBRIA
Magnitude: 56 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in IOWA, WISCONSIN
From 07-SEP-01 17:45:00 to 07-SEP-01 17:55:00 (CST)
Location: REWEY
Magnitude: 56 E
Reported by: LAW ENFORCEMENT

Thunderstorm Wind in JEFFERSON, WISCONSIN
From 07-SEP-01 19:20:00 to 07-SEP-01 19:20:00 (CST)
Location: PALMYRA
Magnitude: 52 E
Reported by: NWS EMPLOYEE(OFF DUTY)

Thunderstorm Wind in GREEN, WISCONSIN
From 07-SEP-01 18:10:00 to 07-SEP-01 18:10:00 (CST)
Location: MONROE
Magnitude: 52 E
Reported by: GENERAL PUBLIC

Flood in DANE, WISCONSIN
From 07-SEP-01 21:00:00 to 07-SEP-01 23:00:00 (CST)
Location: MADISON
Reported by: NEWSPAPER

Thunderstorm Wind in GREEN LAKE, WISCONSIN
From 07-SEP-01 18:30:00 to 07-SEP-01 18:50:00 (CST)
Location: KINGSTON
Magnitude: 56 E
Reported by: EMERGENCY MANAGER