Severe thunderstorms developed during the mid to late afternoon hours of May 29 from Vicksburg east northeast to Battle Creek and Charlotte.  An NWS storm survey found significant damage resulting from straight line wind damage resulting from severe thunderstorm winds of up to 85 to 100 mph.  A state of emergency was declared for Calhoun county due to widespread wind damage.
The storms developed north of a warm front that separated mild weather to the north of it from hot weather south of the boundary.  The storms traveled into northern Illinois just after noon, and then moved across southern lower Michigan between 2 pm and 6 pm. The storms strengthened as they reached far southern lower Michigan as they encountered warmer and more humid air.  The NWS Grand Rapids storm survey teams found no conclusive evidence of any tornadoes from southern Kalamazoo county east northeast through Calhoun county and up into Eaton and Ingham counties.  Nearly 40,000 people across Calhoun county lost power due to all the wind damage and lightning.

Thunderstorm Wind in CALHOUN, MICHIGAN
From 29-MAY-11 15:25:00 to 29-MAY-11 15:55:00 (EST-5)
Location: WEST LEROY
Magnitude: 87.00 EG
Property damage: 25.00M
Reported by: NWS Storm Survey

The bowing segment of a line echo wave pattern caused extensive damage to homes, businesses, and utilities on the south side of Battle Creek along E Columbia Ave. Approximately 600 homes were damaged with 76 of those homes having been destroyed. Also, 21 businesses were damaged of which 4 were destroyed. To the north and east of the Battle Creek area, two dozen rural properties also sustained damage. Throughout the county, over 40,000 customers were without power and thousands of trees were either uprooted or snapped. The damage path was 33 miles long and ranged from 0.5 mile up to 2 miles in width.

Thunderstorm Wind in INGHAM, MICHIGAN
From 29-MAY-11 16:05:00 to 29-MAY-11 16:19:00 (EST-5)
Location: ONONDAGA
Magnitude: 74.00 EG
Property damage: 1.00M
Reported by: NWS Storm Survey

A damage path of nearly 20 miles in length and 0.5-1 mile in width was caused by a bowing segment of an MCS. The path extended from Onondaga northeast to Vantown. As a result of the high winds, numerous large trees were wither uprooted or snapped. Some homes sustained roof damage as well as some barns.

Thunderstorm Wind in KALAMAZOO, MICHIGAN
From 29-MAY-11 15:15:00 to 29-MAY-11 15:27:00 (EST-5)
Location: ADAMS PARK
Magnitude: 78.00 EG
Property damage: 1.20M
Reported by: NWS Storm Survey

The areas most impacted by the bowing segment of the line echo wave pattern fell within Brady and Wakeshma Townships along and south of E W Avenue between 33rd and 47th Streets. Hundreds of trees were either uprooted or snapped, with some snapped 15-20 feet above the ground. Additionally, some structures were damaged with this storm. A grain silo on the corner of E W Avenue and S 40th Street collapsed, and nearly a dozen farm buildings sustained significant roof damage. The damage path was approximately 8 miles long and 3 miles wide.

Tornado in INGHAM, MICHIGAN
From 29-MAY-11 16:27:00 to 29-MAY-11 16:28:00 (EST-5)
Location: BELL OAK
Tornado F-scale: EF0
Property damage: 50.00K
Reported by: NWS Storm Survey

A small tornado touched down in extreme northern Ingham county before crossing over into Shiawassee county. Trees were snapped in a 100 yard wide area, and both a residence and a barn had their roofs partially blown off.

Thunderstorm Wind in EATON, MICHIGAN
From 29-MAY-11 15:55:00 to 29-MAY-11 16:07:00 (EST-5)
Location: CHARLOTTE
Magnitude: 87.00 EG
Property damage: 1.00M
Reported by: NWS Storm Survey

A swath of damage approximately 12 miles long and 0.5 to 1 mile in width occurred SE of Charlotte to just NNE of Eaton Rapids. The damage resulted from a bowing segment of a line echo wave pattern which downed numerous trees and power lines. Several homes in the area sustained roof damage, and one home approximately 3 mi NW of Eaton Rapids was partially destroyed. However, that home was not properly attached to its foundation. Several barns were also damaged, one of which was destroyed.

Thunderstorm Wind in EATON, MICHIGAN
From 29-MAY-11 15:55:00 to 29-MAY-11 16:03:00 (EST-5)
Location: BROOKFIELD
Magnitude: 74.00 EG
Property damage: 1.00M
Reported by: NWS Storm Survey

The bow echo impacted mainly rural areas of Brookfield and Hamlin Townships. The damage path, which was 8 miles long and up to 1 mile in width, was an extension of the damage path seen in Calhoun county.  Hundreds of trees were either uprooted or snapped, and a half of a dozen farms received property damage.

Thunderstorm Wind in INGHAM, MICHIGAN
From 29-MAY-11 16:07:00 to 29-MAY-11 16:15:00 (EST-5)
Location: NORTH AURELIUS
Magnitude: 74.00 EG
Property damage: 500.00K
Reported by: NWS Storm Survey

The bowing segment caused damage in a stretch nearly 7 miles long and 0.5 mile in width from approximately the Ingham county border east into the city of Mason. This path was a continuation of the damage in Eaton county. Strong winds uprooted or snapped numerous large trees in addition to downing power lines near the Mason area.

Thunderstorm Wind in INGHAM, MICHIGAN
From 29-MAY-11 16:17:00 to 29-MAY-11 16:23:00 (EST-5)
Location: MILLVILLE
Magnitude: 78.00 EG
Property damage: 500.00K
Reported by: Emergency Manager

A nearly 3 mile damage path 0.5-1 mile in width was reported in southeastern Ingham county between Swan Road and Dansville road east of US 52. The damage was was caused by a bowing segment that passed through this area. Several barns were damaged, and a garagee was blown down. The garage was not properly secured to the foundation, however. Additionally, some power lines in the area were down.