A cold front moved into a very unstable airmass over southeast Michigan during the afternoon hours of the 9th.  A couple of supercells were able to form along the cold front as the storm motion was toward the east and along the west-to-east oriented boundary. Damaging wind turned out to be the main hazard, even in the weaker storms, as mid level dry air aided in storm downdrafts.

Hail in OAKLAND, MICHIGAN
From 09-JUN-04 12:13:00 to 09-JUN-04 12:13:00 (EST)
Location: HOLLY
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 60 mph thunderstorm wind gust as well.

Hail in OAKLAND, MICHIGAN
From 09-JUN-04 12:11:00 to 09-JUN-04 12:11:00 (EST)
Location: HOLLY
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in OAKLAND, MICHIGAN
From 09-JUN-04 13:00:00 to 09-JUN-04 13:00:00 (EST)
Location: ROCHESTER HILLS
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 09-JUN-04 12:59:00 to 09-JUN-04 12:59:00 (EST)
Location: CHELSEA
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 09-JUN-04 13:40:00 to 09-JUN-04 13:40:00 (EST)
Location: PORT HURON
Magnitude: 52 EG
Reported by: NEWSPAPER

A large tree fell over utility lines near 10th Avenue and Hancock Street. Power was knocked out to area neighborhoods and some traffic signals.

Thunderstorm Wind in SANILAC, MICHIGAN
From 09-JUN-04 13:12:00 to 09-JUN-04 13:12:00 (EST)
Location: BROWN CITY
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

A trained spotter reported tree branches blown down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 09-JUN-04 14:06:00 to 09-JUN-04 14:06:00 (EST)
Location: FERNDALE
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained spotter reported tree branches down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 09-JUN-04 14:12:00 to 09-JUN-04 14:12:00 (EST)
Location: WARREN
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in LAPEER, MICHIGAN
From 09-JUN-04 12:32:00 to 09-JUN-04 12:32:00 (EST)
Location: NORTH BRANCH
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Power lines were reported blown down along M-90.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 09-JUN-04 13:07:00 to 09-JUN-04 13:07:00 (EST)
Location: COHOCTAH
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

A trained weather spotter reported 6 inch tree limbs and small trees down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 09-JUN-04 14:00:00 to 09-JUN-04 14:00:00 (EST)
Location: FLINT
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in GENESEE, MICHIGAN
From 09-JUN-04 14:00:00 to 09-JUN-04 14:00:00 (EST)
Location: MONTROSE
Magnitude: 54 EG
Reported by: TRAINED SPOTTER

Trees and power lines were reported blown down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 09-JUN-04 14:05:00 to 09-JUN-04 14:05:00 (EST)
Location: BURTON
Magnitude: 54 EG
Reported by: LAW ENFORCEMENT

A telephone pole was snapped at the base.

Thunderstorm Wind in TUSCOLA, MICHIGAN
From 09-JUN-04 12:17:00 to 09-JUN-04 12:17:00 (EST)
Location: MILLINGTON
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Several small trees were reported blown down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 09-JUN-04 12:50:00 to 09-JUN-04 12:50:00 (EST)
Location: LAKE ORION
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained spotter reported numerous branches blown down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 09-JUN-04 14:05:00 to 09-JUN-04 14:05:00 (EST)
Location: MT MORRIS
Magnitude: 61 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 70 mph thunderstorm wind gust.

Thunderstorm Wind in MACOMB, MICHIGAN
From 09-JUN-04 13:10:00 to 09-JUN-04 13:10:00 (EST)
Location: ROMEO
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained spotter reported a tree blown down on a house.

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 09-JUN-04 13:20:00 to 09-JUN-04 13:20:00 (EST)
Location: SALINE
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

A trained spotter reported tree limbs down.

Hail in SANILAC, MICHIGAN
From 09-JUN-04 13:20:00 to 09-JUN-04 13:20:00 (EST)
Location: MELVIN
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in MACOMB, MICHIGAN
From 09-JUN-04 13:30:00 to 09-JUN-04 13:30:00 (EST)
Location: STERLING HGTS
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A tree was reported blown down on a shed.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 09-JUN-04 17:51:00 to 09-JUN-04 17:51:00 (EST)
Location: WIXOM
Magnitude: 54 EG
Reported by: TRAINED SPOTTER

Large trees were reported blown down.

Thunderstorm Wind in MONROE, MICHIGAN
From 09-JUN-04 14:15:00 to 09-JUN-04 14:15:00 (EST)
Location: LUNA PIER
Magnitude: 57 MG
Reported by: TRAINED SPOTTER

Thunderstorm Wind in OAKLAND, MICHIGAN
From 09-JUN-04 13:00:00 to 09-JUN-04 13:00:00 (EST)
Location: GOODISON
Magnitude: 52 EG
Reported by: GENERAL PUBLIC

Several trees limbs and trees were reported blown down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 09-JUN-04 13:20:00 to 09-JUN-04 13:20:00 (EST)
Location: TROY
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

A trained spotter estimated a 65 mph thunderstorm wind gust.

Hail in TUSCOLA, MICHIGAN
From 09-JUN-04 12:12:00 to 09-JUN-04 12:12:00 (EST)
Location: WATROUSVILLE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GENESEE, MICHIGAN
From 09-JUN-04 13:34:00 to 09-JUN-04 13:34:00 (EST)
Location: ARGENTINE
Magnitude: 54 EG
Reported by: TRAINED SPOTTER

A trained spotter reported large tree limbs down.

Thunderstorm Wind in WAYNE, MICHIGAN
From 09-JUN-04 14:10:00 to 09-JUN-04 14:10:00 (EST)
Location: DEARBORN HGTS
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

Small trees were reported blown down.

Hail in SAGINAW, MICHIGAN
From 09-JUN-04 15:40:00 to 09-JUN-04 15:40:00 (EST)
Location: LAYTON CORNERS
Magnitude: 1.00 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 09-JUN-04 15:50:00 to 09-JUN-04 15:50:00 (EST)
Location: NEW LOTHROP
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 60 mph thunderstorm wind gust.

Hail in WASHTENAW, MICHIGAN
From 09-JUN-04 13:34:00 to 09-JUN-04 13:34:00 (EST)
Location: MILAN
Magnitude: 0.75 
Reported by: TRAINED SPOTTER