A strong low pressure system tracked from Lake Superior to James Bay. The associated strong cold front swept toward Lower Michigan on the late afternoon of July 10th. Southwesterly flow ahead of the front allowed a warm and moist unstable atmosphere to develop. Numerous pulse severe thunderstorms produced many reports of damaging wind gusts along and north of the I-69 corridor. There were no reports of hail. The most significant damage occurred in Fort Gratiot, where a strong thunderstorm downburst created straight line wind damage one mile wide covering two square miles.

Thunderstorm Wind in MACOMB, MICHIGAN
From 10-JUL-07 16:25:00 to 10-JUL-07 16:25:00 (EST-5)
Location: NEW BALTIMORE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported several large tree branches down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 10-JUL-07 18:15:00 to 10-JUL-07 18:15:00 (EST-5)
Location: CLIO
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A trained spotter reported tree branches 10 inches in diameter down and estimated the wind gusts at 60 MPH.

Thunderstorm Wind in GENESEE, MICHIGAN
From 10-JUL-07 18:02:00 to 10-JUL-07 18:02:00 (EST-5)
Location: FLUSHING
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A trained spotter reported a tree 3 inches in diameter and power lines down.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 10-JUL-07 17:59:00 to 10-JUL-07 17:59:00 (EST-5)
Location: NEW LOTHROP
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A trained spotter reported a tree 35 feet tall down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 10-JUL-07 18:20:00 to 10-JUL-07 18:20:00 (EST-5)
Location: MT MORRIS
Magnitude: 52.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Amateur Radio

A trained spotter reported a large tree branch and power lines down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 10-JUL-07 18:33:00 to 10-JUL-07 18:33:00 (EST-5)
Location: OTISVILLE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Trained spotters reported several trees 7 inches in diameter down.

Thunderstorm Wind in MIDLAND, MICHIGAN
From 10-JUL-07 15:13:00 to 10-JUL-07 15:13:00 (EST-5)
Location: SANFORD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and power lines down at a Junior High School.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 10-JUL-07 18:45:00 to 10-JUL-07 18:45:00 (EST-5)
Location: OWOSSO
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and power lines down.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 10-JUL-07 18:54:00 to 10-JUL-07 18:54:00 (EST-5)
Location: JUDDVILLE
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and power lines down.

Thunderstorm Wind in SANILAC, MICHIGAN
From 10-JUL-07 20:00:00 to 10-JUL-07 20:00:00 (EST-5)
Location: LEXINGTON HGTS
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and power lines down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 10-JUL-07 16:01:00 to 10-JUL-07 16:01:00 (EST-5)
Location: RICHMOND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported numerous tree branches 6 inches in diameter down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 10-JUL-07 16:01:00 to 10-JUL-07 16:01:00 (EST-5)
Location: ROCHESTER HILLS
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large spruce tree down.

Thunderstorm Wind in HURON, MICHIGAN
From 10-JUL-07 16:55:00 to 10-JUL-07 16:55:00 (EST-5)
Location: PIGEON
Magnitude: 56.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported numerous trees down, damaging at least one house and one shed.

Thunderstorm Wind in SANILAC, MICHIGAN
From 10-JUL-07 17:32:00 to 10-JUL-07 17:32:00 (EST-5)
Location: ARGYLE
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported power lines and a tree down.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 10-JUL-07 16:16:00 to 10-JUL-07 16:16:00 (EST-5)
Location: PORT HURON
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported numerous trees and power poles down in Fort Gratiot, covering a 2 square mile area between Keewahdin and Carrigan Roads. Several homes received damage from falling trees. No one was injured. Total property damages were estimated at roughly $50K.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 10-JUL-07 15:35:00 to 10-JUL-07 15:35:00 (EST-5)
Location: SAGINAW
Magnitude: 56.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported two trees down and shingles blown off a house.

Thunderstorm Wind in MIDLAND, MICHIGAN
From 10-JUL-07 15:12:00 to 10-JUL-07 15:12:00 (EST-5)
Location: SANFORD
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large tree down on a house. Damages to the home were minor. Many trees and power lines were down in the heavily populated area off North West River Road next to Sanford Lake. Power lines had to be pulled from several homes. Total damages were estimated at roughly $5K.

Thunderstorm Wind in LAPEER, MICHIGAN
From 10-JUL-07 18:33:00 to 10-JUL-07 18:33:00 (EST-5)
Location: COLUMBIAVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported a large tree down.