A cold front slowly approached the western Great Lakes region on Sep. 7th and 8th. Warm and unstable air ahead of this front, in combination with weak upper level disturbances, allowed thunderstorms to develop during the afternoon and evening hours both days. Late in the day on the 9th, the cold front finally passed through Southeast Michigan. Very unstable air ahead of the front, along with strong winds aloft, again led to thunderstorm development during the afternoon and evening. Most of the thunderstorms that developed over this three day period produced severe wind gusts. The most common type of damage from these storms was trees being blown down or broken. Some of the storms also produced torrential rainfall. However, the rainfall did not last long enough to produce widespread or serious flooding.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 08-SEP-01 16:03:00 to 08-SEP-01 16:03:00 (EST)
Location: OWOSSO
Magnitude: 55 E
Reported by: TRAINED SPOTTER

Trees blown down.

Thunderstorm Wind in LENAWEE, MICHIGAN
From 08-SEP-01 15:57:00 to 08-SEP-01 15:57:00 (EST)
Location: ADRIAN
Magnitude: 50 E
Reported by: LAW ENFORCEMENT

Large tree limbs blew down on power lines and knocked the power lines down.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 08-SEP-01 15:50:00 to 08-SEP-01 15:50:00 (EST)
Location: OWOSSO
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Several trees blown down.

Thunderstorm Wind in MONROE, MICHIGAN
From 08-SEP-01 16:40:00 to 08-SEP-01 16:40:00 (EST)
Location: MAYBEE
Magnitude: 65 E
Property damage: 20K
Reported by: LAW ENFORCEMENT

Garage was blown down.

Thunderstorm Wind in WAYNE, MICHIGAN
From 08-SEP-01 16:45:00 to 08-SEP-01 16:45:00 (EST)
Location: BELLEVILLE
Magnitude: 50 E
Reported by: LAW ENFORCEMENT

Several trees and power lines blown down.

Thunderstorm Wind in MONROE, MICHIGAN
From 08-SEP-01 16:50:00 to 08-SEP-01 16:50:00 (EST)
Location: LA SALLE
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Large trees and power lines blown down.

Thunderstorm Wind in WAYNE, MICHIGAN
From 08-SEP-01 17:08:00 to 08-SEP-01 17:08:00 (EST)
Location: ROMULUS
Magnitude: 60 E
Property damage: 10K
Reported by: TRAINED SPOTTER

A roof collapsed due to high winds.

Thunderstorm Wind in MACOMB, MICHIGAN
From 08-SEP-01 17:20:00 to 08-SEP-01 17:20:00 (EST)
Location: UTICA
Magnitude: 52 E
Reported by: TRAINED SPOTTER

Thunderstorm Wind in LAPEER, MICHIGAN
From 08-SEP-01 17:25:00 to 08-SEP-01 17:25:00 (EST)
Location: LAPEER
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Large tree limbs blown down.

Thunderstorm Wind in BAY, MICHIGAN
From 07-SEP-01 17:55:00 to 07-SEP-01 17:55:00 (EST)
Location: BAY CITY
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Several trees and power lines blown down.

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 07-SEP-01 18:10:00 to 07-SEP-01 18:10:00 (EST)
Location: CORUNNA
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Several trees blown down.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 07-SEP-01 18:17:00 to 07-SEP-01 18:17:00 (EST)
Location: CHESANING
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Large trees blown down.

Hail in SANILAC, MICHIGAN
From 09-SEP-01 11:45:00 to 09-SEP-01 11:45:00 (EST)
Location: LEXINGTON
Magnitude: 0.75 
Reported by: GENERAL PUBLIC

Lightning in ST. CLAIR, MICHIGAN
From 09-SEP-01 15:00:00 to 09-SEP-01 15:00:00 (EST)
Location: ANCHORVILLE
Property damage: 20K
Reported by: NEWSPAPER

Lightning struck a tree, causing the tree to break and land on top of a house.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 09-SEP-01 15:05:00 to 09-SEP-01 15:05:00 (EST)
Location: MARINE CITY
Magnitude: 60 E
Property damage: 5K
Reported by: NEWSPAPER

A 100 year old barn was completely destroyed by the winds.

Thunderstorm Wind in GENESEE, MICHIGAN
From 09-SEP-01 19:02:00 to 09-SEP-01 19:02:00 (EST)
Location: LINDEN
Magnitude: 50 E
Reported by: GENERAL PUBLIC

Several large trees were blown down.

Thunderstorm Wind in MIDLAND, MICHIGAN
From 07-SEP-01 17:40:00 to 07-SEP-01 17:40:00 (EST)
Location: MIDLAND
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Several large limbs blown down.

Hail in MIDLAND, MICHIGAN
From 07-SEP-01 17:08:00 to 07-SEP-01 17:08:00 (EST)
Location: POSEYVILLE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 09-SEP-01 18:35:00 to 09-SEP-01 18:35:00 (EST)
Location: CHELSEA
Magnitude: 55 E
Reported by: TRAINED SPOTTER

Large 2 feet diameter trees blown down.

Thunderstorm Wind in WAYNE, MICHIGAN
From 07-SEP-01 16:55:00 to 07-SEP-01 16:55:00 (EST)
Location: LIVONIA
Magnitude: 50 E
Reported by: BROADCAST MEDIA

Several large tree limbs blown down.

Thunderstorm Wind in SANILAC, MICHIGAN
From 08-SEP-01 17:45:00 to 08-SEP-01 17:45:00 (EST)
Location: CROSWELL
Magnitude: 50 E
Reported by: GENERAL PUBLIC

Trees blown down.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 07-SEP-01 18:30:00 to 07-SEP-01 18:30:00 (EST)
Location: BUENA VISTA
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Large trees blown down.

Hail in TUSCOLA, MICHIGAN
From 07-SEP-01 19:05:00 to 07-SEP-01 19:05:00 (EST)
Location: MAYVILLE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WAYNE, MICHIGAN
From 08-SEP-01 16:55:00 to 08-SEP-01 16:55:00 (EST)
Location: WESTLAND
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Trees and power lines blown down.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 09-SEP-01 18:57:00 to 09-SEP-01 18:57:00 (EST)
Location: HAMBURG
Magnitude: 55 E
Reported by: GENERAL PUBLIC

Large trees were blown down.

Thunderstorm Wind in MONROE, MICHIGAN
From 08-SEP-01 17:00:00 to 08-SEP-01 17:00:00 (EST)
Location: MONROE
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

A few large trees blown down.

Thunderstorm Wind in WAYNE, MICHIGAN
From 08-SEP-01 17:00:00 to 08-SEP-01 17:00:00 (EST)
Location: INKSTER
Magnitude: 52 E
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MACOMB, MICHIGAN
From 08-SEP-01 17:30:00 to 08-SEP-01 17:30:00 (EST)
Location: ROMEO
Magnitude: 60 E
Reported by: TRAINED SPOTTER

Several large trees were uprooted.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 08-SEP-01 17:50:00 to 08-SEP-01 17:50:00 (EST)
Location: BERVILLE
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Several trees blown down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 08-SEP-01 16:31:00 to 08-SEP-01 16:31:00 (EST)
Location: MONTROSE
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Trees blown down.

Thunderstorm Wind in MONROE, MICHIGAN
From 08-SEP-01 16:32:00 to 08-SEP-01 16:32:00 (EST)
Location: MILAN
Magnitude: 55 E
Reported by: LAW ENFORCEMENT

Telephone pole blown over.

Thunderstorm Wind in MACOMB, MICHIGAN
From 08-SEP-01 17:30:00 to 08-SEP-01 17:30:00 (EST)
Location: ROMEO
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Large tree limbs blown down.

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 08-SEP-01 16:30:00 to 08-SEP-01 16:30:00 (EST)
Location: YPSILANTI
Magnitude: 50 E
Reported by: TRAINED SPOTTER

Trees blown down.

Thunderstorm Wind in MIDLAND, MICHIGAN
From 09-SEP-01 18:07:00 to 09-SEP-01 18:07:00 (EST)
Location: MIDLAND
Magnitude: 50 E
Reported by: LAW ENFORCEMENT

Power lines were blown down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 09-SEP-01 14:39:00 to 09-SEP-01 14:39:00 (EST)
Location: MT CLEMENS
Magnitude: 66 M
Reported by: AWOS,ASOS,MESONET,ETC

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 09-SEP-01 15:05:00 to 09-SEP-01 15:05:00 (EST)
Location: MARINE CITY
Magnitude: 60 E
Property damage: 8K
Reported by: LAW ENFORCEMENT

Numerous trees were blown down and a travel trailer was overturned.

Waterspout in SANILAC, MICHIGAN
From 09-SEP-01 11:47:00 to 09-SEP-01 11:47:00 (EST)
Location: LEXINGTON
Reported by: GENERAL PUBLIC

The waterspout was witnessed by boaters a quarter of a mile from the breakwall offshore of Lexington.

Hail in MONROE, MICHIGAN
From 09-SEP-01 12:28:00 to 09-SEP-01 12:28:00 (EST)
Location: SAMARIA
Magnitude: 0.75 
Reported by: FIRE DEPT/RESCUE SQUAD

Thunderstorm Wind in MACOMB, MICHIGAN
From 08-SEP-01 17:35:00 to 08-SEP-01 17:35:00 (EST)
Location: ST CLAIR SHRS
Magnitude: 50 E
Reported by: NEWSPAPER

trees blown down in Eastpoint.

Thunderstorm Wind in MACOMB, MICHIGAN
From 08-SEP-01 17:38:00 to 08-SEP-01 17:38:00 (EST)
Location: ST CLAIR SHRS
Magnitude: 55 E
Reported by: NEWSPAPER

Several trees blown down.