An upper level disturbance and weak surface low moved south across central Lower Michigan during the evening of the 29th. This low pressure system, combined with very unstable air across southern Michigan, triggered numerous thunderstorms. These storms were strongest across the western sections of southeast Michigan, where several reports of damaging winds and large hail were received. The storms also caused many power outages. 5000 power outages were estimated in Oakland county and 3000 in Livingston. Monroe county also reported many power outages.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 29-JUL-01 18:00:00 to 29-JUL-01 18:00:00 (EST)
Location: OWOSSO
Magnitude: 60 E
Reported by: LAW ENFORCEMENT

Poles and wires down at M21 adn Baldwin Rd.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 29-JUL-01 18:04:00 to 29-JUL-01 18:04:00 (EST)
Location: OWOSSO
Magnitude: 50 E
Reported by: GENERAL PUBLIC

Large limbs down.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 29-JUL-01 18:55:00 to 29-JUL-01 18:55:00 (EST)
Location: PINCKNEY
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Several Trees blown down.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 29-JUL-01 19:00:00 to 29-JUL-01 19:00:00 (EST)
Location: BRIGHTON
Magnitude: 50 E
Reported by: LAW ENFORCEMENT

Limbs and power lines blown down.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 29-JUL-01 19:10:00 to 29-JUL-01 19:10:00 (EST)
Location: BRIGHTON
Magnitude: 50 E
Reported by: NWS EMPLOYEE(OFF DUTY)

Trees blown down.

Hail in WASHTENAW, MICHIGAN
From 29-JUL-01 19:05:00 to 29-JUL-01 19:05:00 (EST)
Location: CHELSEA
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 29-JUL-01 17:55:00 to 29-JUL-01 17:55:00 (EST)
Location: CARLAND
Magnitude: 60 E
Reported by: LAW ENFORCEMENT

50 trees blown down.

Thunderstorm Wind in MONROE, MICHIGAN
From 29-JUL-01 20:29:00 to 29-JUL-01 20:29:00 (EST)
Location: LAMBERTVILLE
Magnitude: 50 E
Reported by: LAW ENFORCEMENT

Tree blown down onto power lines.

Hail in WASHTENAW, MICHIGAN
From 29-JUL-01 19:10:00 to 29-JUL-01 19:10:00 (EST)
Location: DEXTER
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in WASHTENAW, MICHIGAN
From 29-JUL-01 19:12:00 to 29-JUL-01 19:12:00 (EST)
Location: CHELSEA
Magnitude: 1.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 29-JUL-01 19:23:00 to 29-JUL-01 19:23:00 (EST)
Location: DEXTER
Magnitude: 60 E
Property damage: 5K
Reported by: TRAINED SPOTTER

Tress blown down onto a vehicle.

Hail in WASHTENAW, MICHIGAN
From 29-JUL-01 19:24:00 to 29-JUL-01 19:24:00 (EST)
Location: MANCHESTER
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in OAKLAND, MICHIGAN
From 29-JUL-01 19:00:00 to 29-JUL-01 19:00:00 (EST)
Location: MILFORD
Magnitude: 60 E
Reported by: GENERAL PUBLIC

Large trees blown down in Kensington Metro Park.

Hail in LENAWEE, MICHIGAN
From 29-JUL-01 20:04:00 to 29-JUL-01 20:04:00 (EST)
Location: TECUMSEH
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Hail in LENAWEE, MICHIGAN
From 29-JUL-01 20:05:00 to 29-JUL-01 20:05:00 (EST)
Location: TECUMSEH
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 29-JUL-01 18:30:00 to 29-JUL-01 18:30:00 (EST)
Location: FOWLERVILLE
Magnitude: 60 E
Reported by: LAW ENFORCEMENT

Trees blown down at Fowlerville and Mohrle Roads.

Hail in WASHTENAW, MICHIGAN
From 29-JUL-01 19:46:00 to 29-JUL-01 19:46:00 (EST)
Location: YPSILANTI
Magnitude: 0.75 
Property damage: 10K
Reported by: LAW ENFORCEMENT

Several vehicles damaged by hail at state police post.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 29-JUL-01 18:07:00 to 29-JUL-01 18:07:00 (EST)
Location: PERRY
Magnitude: 50 E
Reported by: LAW ENFORCEMENT

Several tress blown down.

Hail in SHIAWASSEE, MICHIGAN
From 29-JUL-01 18:07:00 to 29-JUL-01 18:07:00 (EST)
Location: BENNINGTON
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 29-JUL-01 18:24:00 to 29-JUL-01 18:24:00 (EST)
Location: COHOCTAH
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Uprooted tree blocking cohoctah road.

Lightning in WASHTENAW, MICHIGAN
From 29-JUL-01 19:20:00 to 29-JUL-01 19:20:00 (EST)
Location: MANCHESTER
Property damage: 2K
Reported by: BROADCAST MEDIA

Lightning struck a house. Only minor damage was reported.

Lightning in WASHTENAW, MICHIGAN
From 29-JUL-01 19:11:00 to 29-JUL-01 19:11:00 (EST)
Location: SALINE
Property damage: 65K
Reported by: BROADCAST MEDIA

A storage shed and 900 gallons of diesel fuel caught fire when lightning struck the fuel tanks in Pittsfield Township.