A closed mid to upper-level low tracking across the northern U.S. took an associated surface low from the Dakotas, to Lake Superior and into southern Canada.  The tight pressure gradient around this system produced strong winds across southern Wisconsin during the day. Wind gusts reached 40 to 50 mph (35 to 44 knots) in many locations.  An 80 year-old Wauwatosa (Milwaukee County) man was killed in his back yard when a tree limb, estimated to weigh 1000 pounds, struck him after being blown down by the strong winds.  The limb knocked the man's garage off its foundation.  The highest measured wind gust reported in southern Wisconsin was 55 mph (48 knots) measured just southeast of downtown Pewaukee in Waukesha County.  There were scattered reports of downed power lines due to broken tree branches falling on wires.

Strong Wind in FOND DU LAC, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported a large tree blown down by wind gusts estimated at 45 mph (39 knots) 1 mile southwest of Campbellsport.

Strong Wind in WASHINGTON, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 42.00 EG
Property damage: 5.00K
Reported by: Trained Spotter

A trained spotter in West Bend estimated wind gusts to 42 knots (48 mph). A mesonet site east southeast of Jackson recorded a wind gust of 47 mph (41 knots).

Strong Wind in SHEBOYGAN, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 44.00 MG
Property damage: 5.00K
Reported by: Mesonet

A mesonet site in Sheboygan reported a 50 mph (44 knots) wind gust.

Strong Wind in DODGE, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported tree damage due to wind gusts estimated to 39 knots (45 mph).

Strong Wind in DANE, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported tree damage due to wind gusts estimated up to 39 knots (45 mph).

Strong Wind in IOWA, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Law enforcement officials reported wind gusts estimated up to 39 knots (45 mph).

Strong Wind in MILWAUKEE, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 42.00 MG
Property damage: 5.00K
Reported by: Mesonet

A high school mesonet site north of Wauwatosa measured a wind gust of 42 knots (48 mph). An 80 year-old Wauwatosa man was seriously injured when a tree limb, estimated to weigh 1000 pounds, struck him in his back yard. He later died from his injuries. The limb knocked the man's garage off its foundation.

Strong Wind in WAUKESHA, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 48.00 MG
Property damage: 5.00K
Reported by: Trained Spotter

A trained spotter southeast of Pewaukee measured a wind gust of 48 knots (55 mph). A mesonet site south southwest of Menomonee Falls recorded a wind gust of 39 knots (45 mph).

Strong Wind in LAFAYETTE, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 MG
Property damage: 5.00K
Reported by: Mesonet

A mesonet site in Darlington reported a 45 mph (39 knot) wind gust.

Strong Wind in GREEN, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 MG
Property damage: 5.00K
Reported by: AWOS

The AWOS site at the airport in Monroe recorded a 45 mph (39 knot) wind gust.

Strong Wind in ROCK, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 10.00K
Reported by: Law Enforcement

Law enforcement officials reported tree damage from Evansville to Milton due to wind gusts estimated up to 45 mph (39 knots).

Strong Wind in WALWORTH, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 39.00 EG
Property damage: 10.00K
Reported by: Law Enforcement

Law enforcement officials reported tree damage from wind gusts estimated up to 45 mph (39 knots).

Strong Wind in KENOSHA, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 45.00 MG
Property damage: 5.00K
Reported by: ASOS

The ASOS at Kenosha County Airport measured a 51 mph (45 knots) wind gust. The marine observation site near the Kenosha Harbor recorded a wind gust measured at 47 mph (41 knots).

Strong Wind in RACINE, WISCONSIN
From 07-SEP-10 09:00:00 to 07-SEP-10 17:00:00 (CST-6)
Magnitude: 41.00 MG
Property damage: 5.00K
Reported by: Mesonet

A mesonet site just southwest of downtown Racine recorded a wind gust measured at 47 mph (41 knots). A second mesonet site reported a 46 mph (40 knots) wind gust.