During the morning hours, a line of strong to severe thunderstorms developed west of Upper Michigan and continued to track eastward throughout the morning and early afternoon hours. This line of strong to severe storms brought nickel to quarter size hail and strong wind gusts that snapped power poles and medium to large size trees.

Hail in HOUGHTON, MICHIGAN
From 22-SEP-17 10:21:00 to 22-SEP-17 10:25:00 (EST-5)
Location: STANWOOD
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The spotter four miles southeast of Redridge reported penny sized hail.

Hail in HOUGHTON, MICHIGAN
From 22-SEP-17 10:40:00 to 22-SEP-17 10:44:00 (EST-5)
Location: CENTENNIAL HGTS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

There was a public report of one half to three quarter inch diameter hail at Centennial Heights near Calumet.

Hail in HOUGHTON, MICHIGAN
From 22-SEP-17 10:45:00 to 22-SEP-17 10:50:00 (EST-5)
Location: TAMARACK
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter six miles southwest of Gay reported pea to nickel sized hail.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 22-SEP-17 09:35:00 to 22-SEP-17 09:39:00 (CST-6)
Location: HURLEY
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Law Enforcement

The Gogebic County Sheriff reported a tree down across a road just southeast of Ironwood.  Time of the report was estimated from radar.

Hail in BARAGA, MICHIGAN
From 22-SEP-17 11:50:00 to 22-SEP-17 11:55:00 (EST-5)
Location: NESTORIA
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter just northwest of Michigamme reported mainly pea to dime sized hail with a few stones the size of nickels.

Thunderstorm Wind in MARQUETTE, MICHIGAN
From 22-SEP-17 13:16:00 to 22-SEP-17 13:20:00 (EST-5)
Location: AUSTIN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported power lines down three miles northwest of Gwinn.

Hail in HOUGHTON, MICHIGAN
From 22-SEP-17 10:37:00 to 22-SEP-17 10:40:00 (EST-5)
Location: LAURIUM
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter in Laurium reported hail up to the size of quarters.

Thunderstorm Wind in GOGEBIC, MICHIGAN
From 22-SEP-17 10:10:00 to 22-SEP-17 10:14:00 (CST-6)
Location: MARENISCO
Magnitude: 55.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local law enforcement reported power lines down and trees across the road 8 miles ENE of Marenisco.

Thunderstorm Wind in IRON, MICHIGAN
From 22-SEP-17 11:20:00 to 22-SEP-17 11:25:00 (CST-6)
Location: STAMBAUGH CITY ARPT
Magnitude: 55.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

There were reports of snapped power poles and several medium to large diameter trees downed. Downed trees blocked Baumgartner road in the Stambaugh Township.

Thunderstorm Wind in IRON, MICHIGAN
From 22-SEP-17 11:40:00 to 22-SEP-17 11:47:00 (CST-6)
Location: SCOTT LAKE
Magnitude: 56.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Broadcast Media

There were multiple trees downed with widespread tree debris at the George Young Golf Course several miles southeast of Iron River.  These reports were a combination of public and broadcast media.