Severe storms rolled through during the late afternoon and evening hours producing numerous reports of high thunderstorm wind gusts of up to around 75 mph as well as several reports of large hail.  In spite of the powerful winds, National Weather Service storm damage surveys revealed only spotty tree damage in Muskegon, Kent, Ionia and Clare counties which resulted in some power outages.

Thunderstorm Wind in OTTAWA, MICHIGAN
From 21-SEP-10 19:55:00 to 21-SEP-10 20:02:00 (EST-5)
Location: HUDSONVILLE
Magnitude: 61.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Power lines were blown down on Chicago Drive in Hudsonville.

Thunderstorm Wind in KENT, MICHIGAN
From 21-SEP-10 19:59:00 to 21-SEP-10 20:22:00 (EST-5)
Location: BEVERLY
Magnitude: 63.00 MG
Property damage: 50.00K
Reported by: Broadcast Media

Several large trees were blown down across portions of Kent county and the bow echo produced a 72 mph measured wind gust at the Gerald R. Ford International Airport in Grand Rapids.

Hail in ISABELLA, MICHIGAN
From 21-SEP-10 20:05:00 to 21-SEP-10 20:05:00 (EST-5)
Location: MT PLEASANT
Magnitude: 1.00 
Reported by: NWS Employee

An NWS employee reported one inch diameter hail in Mt. Pleasant.

Lightning in KENT, MICHIGAN
From 21-SEP-10 20:15:00 to 21-SEP-10 20:20:00 (EST-5)
Location: EASTMONT
Property damage: 500.00K
Reported by: Fire Department/Rescue

Local fire departments reported that around a dozen house fires were produced by lightning from Ada south to Caledonia.

Thunderstorm Wind in IONIA, MICHIGAN
From 21-SEP-10 20:26:00 to 21-SEP-10 20:35:00 (EST-5)
Location: SARANAC
Magnitude: 52.00 EG
Property damage: 25.00K
Reported by: NWS Storm Survey

An NWS storm survey reported spotty tree damage across portions of Ionia county.

Thunderstorm Wind in MONTCALM, MICHIGAN
From 21-SEP-10 20:44:00 to 21-SEP-10 20:44:00 (EST-5)
Location: SIX LAKES
Magnitude: 52.00 EG
Reported by: Amateur Radio

Amateur radio operators reported that several eight inch diameter trees were blown down in Six Lakes.

Thunderstorm Wind in INGHAM, MICHIGAN
From 21-SEP-10 21:38:00 to 21-SEP-10 21:38:00 (EST-5)
Location: WILLIAMSTON
Magnitude: 52.00 EG
Property damage: 50.00K
Reported by: Emergency Manager

An Ingham county emergency manager reported that numerous trees and power lines were blown down between Williamston and Webberville.

Thunderstorm Wind in CLARE, MICHIGAN
From 21-SEP-10 17:50:00 to 21-SEP-10 17:50:00 (EST-5)
Location: HARRISON ARPT
Magnitude: 52.00 EG
Reported by: Emergency Manager

Clare county emergency managers reported trees down in a subdivision north of Harrison.

Hail in ISABELLA, MICHIGAN
From 21-SEP-10 18:36:00 to 21-SEP-10 18:36:00 (EST-5)
Location: WEIDMAN
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 25.00K
Reported by: Trained Spotter

Golf ball sized hail was reported near Weidman by a trained spotter.

Hail in MECOSTA, MICHIGAN
From 21-SEP-10 18:55:00 to 21-SEP-10 18:55:00 (EST-5)
Location: MORLEY
Magnitude: 1.75 
Property damage: 50.00K
Crop damage: 25.00K
Reported by: Fire Department/Rescue

The fire department reported golf ball sized hail in Morley.

Thunderstorm Wind in MUSKEGON, MICHIGAN
From 21-SEP-10 19:30:00 to 21-SEP-10 19:35:00 (EST-5)
Location: MICHILLINDA
Magnitude: 66.00 MG
Property damage: 50.00K
Reported by: NWS Storm Survey

An NWS storm survey revealed only spotty tree damage near Duck Lake state park and Muskegon.  A 76 mph wind gust was measured at the Muskegon GLERL field station.

Hail in ISABELLA, MICHIGAN
From 21-SEP-10 19:31:00 to 21-SEP-10 19:33:00 (EST-5)
Location: BEAL CITY
Magnitude: 1.00 
Reported by: Broadcast Media

Three quarters to one inch diameter hail was reported in Beal City and also near Rosebush.

Thunderstorm Wind in ALLEGAN, MICHIGAN
From 21-SEP-10 19:39:00 to 21-SEP-10 19:45:00 (EST-5)
Location: PIER COVE
Magnitude: 65.00 MG
Reported by: Trained Spotter

A trained spotter reported a measured 75 mph wind gust at West County Park in Fennville. A 72 mph measured wind gust was recored at the Holland ASOS.

Thunderstorm Wind in VAN BUREN, MICHIGAN
From 21-SEP-10 19:40:00 to 21-SEP-10 19:40:00 (EST-5)
Location: SOUTH HAVEN
Magnitude: 55.00 MG
Reported by: Official NWS Observations

A 63 mph wind gust was measured at the South Haven GLERL site.

Hail in MASON, MICHIGAN
From 21-SEP-10 16:32:00 to 21-SEP-10 16:32:00 (EST-5)
Location: BASS LAKE
Magnitude: 1.00 
Reported by: Fire Department/Rescue

The fire department reported hail up to one inch in diameter two miles northeast of Summit township.