Severe thunderstorms were set off over Michigan's Upper Peninsula on July 31st  as warm, moist air over the area interacted with a  warm front that moved north from Wisconsin.  Large hail and damaging winds were reported.

Thunderstorm Wind in ALGER, MICHIGAN
From 31-JUL-02 16:15:00 to 31-JUL-02 16:15:00 (EST)
Location: MUNISING
Magnitude: 55 E
Reported by: TRAINED SPOTTER

A spotter estimated 65 mph wind gusts.

Thunderstorm Wind in SCHOOLCRAFT, MICHIGAN
From 31-JUL-02 16:25:00 to 31-JUL-02 16:25:00 (EST)
Location: MANISTIQUE
Magnitude: 65 E
Reported by: LAW ENFORCEMENT

Numerous trees and power lines were blown down.

Thunderstorm Wind in SCHOOLCRAFT, MICHIGAN
From 31-JUL-02 16:25:00 to 31-JUL-02 16:25:00 (EST)
Location: STEUBEN
Magnitude: 60 E
Reported by: TRAINED SPOTTER

A 10 inch diameter tree branch was broken off.

Thunderstorm Wind in ALGER, MICHIGAN
From 31-JUL-02 16:38:00 to 31-JUL-02 16:38:00 (EST)
Location: SHINGLETON
Magnitude: 65 E
Reported by: LAW ENFORCEMENT

Power lines and 10 to 12 inch diameter trees were blown down.

Thunderstorm Wind in DELTA, MICHIGAN
From 31-JUL-02 15:40:00 to 31-JUL-02 15:40:00 (EST)
Location: CORNELL
Magnitude: 60 E
Reported by: TRAINED SPOTTER

Numerous small trees were blown down.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 31-JUL-02 14:20:00 to 31-JUL-02 14:20:00 (CST)
Location: HARDWOOD
Magnitude: 65 E
Reported by: TRAINED SPOTTER

Numerous trees 1 to 2 feet in diameter were blown down.

Hail in ONTONAGON, MICHIGAN
From 31-JUL-02 07:40:00 to 31-JUL-02 07:40:00 (EST)
Location: PAULDING
Magnitude: 1.00 
Reported by: NWS STORM SURVEY

Quarter sized hail was reported.

Hail in IRON, MICHIGAN
From 31-JUL-02 07:27:00 to 31-JUL-02 07:27:00 (CST)
Location: GAASTRA
Magnitude: 1.50 
Reported by: NWS STORM SURVEY

Hail the size of a fifty-cent piece was reported.

Hail in HOUGHTON, MICHIGAN
From 31-JUL-02 08:33:00 to 31-JUL-02 08:33:00 (EST)
Location: SIDNAW
Magnitude: 0.75 
Reported by: NWS STORM SURVEY

Penny sized hail was reported.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 31-JUL-02 08:15:00 to 31-JUL-02 08:15:00 (CST)
Location: LA BRANCH
Magnitude: 60 E
Reported by: NWS STORM SURVEY

A tree 10 inches in diameter was blown down.

Thunderstorm Wind in ONTONAGON, MICHIGAN
From 31-JUL-02 09:40:00 to 31-JUL-02 09:40:00 (EST)
Location: MASS
Magnitude: 65 E
Reported by: NWS STORM SURVEY

An apple tree 1 foot in diameter was blown down.

Thunderstorm Wind in DELTA, MICHIGAN
From 31-JUL-02 09:40:00 to 31-JUL-02 09:40:00 (EST)
Location: ROCK
Magnitude: 60 E
Reported by: NWS STORM SURVEY

Tree branches 3 to 5 inched in diameter were broken off.

Hail in IRON, MICHIGAN
From 31-JUL-02 07:28:00 to 31-JUL-02 07:28:00 (CST)
Location: CRYSTAL FALLS
Magnitude: 1.25 
Reported by: TRAINED SPOTTER

One and a quarter inch diameter hail was reported.

Hail in GOGEBIC, MICHIGAN
From 31-JUL-02 06:30:00 to 31-JUL-02 06:30:00 (CST)
Location: MARENISCO
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Three quarter inch hail was reported.

Hail in DICKINSON, MICHIGAN
From 31-JUL-02 08:00:00 to 31-JUL-02 08:00:00 (CST)
Location: IRON MTN
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Penny sized hail was reported.

Hail in BARAGA, MICHIGAN
From 31-JUL-02 08:40:00 to 31-JUL-02 08:40:00 (EST)
Location: COVINGTON
Magnitude: 1.00 
Reported by: LAW ENFORCEMENT

One inch diameter hail was reported.

Hail in MARQUETTE, MICHIGAN
From 31-JUL-02 09:13:00 to 31-JUL-02 09:13:00 (EST)
Location: REPUBLIC
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Penny sized hail was reported.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 31-JUL-02 14:10:00 to 31-JUL-02 14:10:00 (CST)
Location: IRON MTN
Magnitude: 65 E
Reported by: LAW ENFORCEMENT

Numerous trees and power lines were blown down across the Iron Mountain area.

Thunderstorm Wind in DELTA, MICHIGAN
From 31-JUL-02 15:55:00 to 31-JUL-02 15:55:00 (EST)
Location: GLADSTONE
Magnitude: 60 E
Reported by: DEPT OF HIGHWAYS

Three to four inch diameter trees  were blown down across River Road.

Thunderstorm Wind in MENOMINEE, MICHIGAN
From 31-JUL-02 14:25:00 to 31-JUL-02 14:25:00 (CST)
Location: LA BRANCH
Magnitude: 60 E
Reported by: DEPT OF HIGHWAYS

A tree was blown down across the road.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 31-JUL-02 15:20:00 to 31-JUL-02 15:20:00 (EST)
Location: ARNOLD
Magnitude: 55 E
Reported by: TRAINED SPOTTER

One to two inch diameter branches were broken off.

Thunderstorm Wind in DICKINSON, MICHIGAN
From 31-JUL-02 14:15:00 to 31-JUL-02 14:15:00 (CST)
Location: FOSTER CITY
Magnitude: 60 E
Reported by: TRAINED SPOTTER

Trees and branches were blown down.