A strong mid level trough and resultant increased wind field interacted with a stationary boundary and moderate instability. A long lived squall line developed across Illinois and moved east into far southern Lower Michigan. Numerous reports of trees, tree limbs and power lines were blown down with winds more than 70 mph at times.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 17:25:00 to 18-JUN-10 17:26:00 (EST-5)
Location: NEW BUFFALO
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous reports of trees and power lines down.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 17:39:00 to 18-JUN-10 17:40:00 (EST-5)
Location: BUCHANAN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree limbs down.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 17:46:00 to 18-JUN-10 17:47:00 (EST-5)
Location: NILES
Magnitude: 70.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Nine power poles snapped.

Thunderstorm Wind in CASS, MICHIGAN
From 18-JUN-10 17:50:00 to 18-JUN-10 17:51:00 (EST-5)
Location: BARRON LAKE
Magnitude: 60.00 EG
Property damage: 7.50K
Crop damage: 0.00K
Reported by: Amateur Radio

A tree fell into a house and collapsed the bathroom wall.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 17:52:00 to 18-JUN-10 17:53:00 (EST-5)
Location: ST JOSEPH
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Tree branches down.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 18:00:00 to 18-JUN-10 18:01:00 (EST-5)
Location: BUCHANAN
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trees down.

Thunderstorm Wind in BRANCH, MICHIGAN
From 18-JUN-10 19:42:00 to 18-JUN-10 19:43:00 (EST-5)
Location: BRONSON ARPT
Magnitude: 60.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported widespread power outages and a tree that fell on a car.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 18-JUN-10 18:49:00 to 18-JUN-10 18:50:00 (EST-5)
Location: WHITE PIGEON
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Numerous trees and power lines down.

Thunderstorm Wind in BRANCH, MICHIGAN
From 18-JUN-10 18:58:00 to 18-JUN-10 18:59:00 (EST-5)
Location: UNION CITY
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees and power lines down.

Thunderstorm Wind in BRANCH, MICHIGAN
From 18-JUN-10 18:59:00 to 18-JUN-10 19:00:00 (EST-5)
Location: BRONSON ARPT
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Numerous trees and power lines down.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 18-JUN-10 19:19:00 to 18-JUN-10 19:20:00 (EST-5)
Location: OAKWOOD
Magnitude: 60.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A 40 foot tall, 1 foot diameter tree was down.

Thunderstorm Wind in HILLSDALE, MICHIGAN
From 18-JUN-10 19:59:00 to 18-JUN-10 20:00:00 (EST-5)
Location: HILLSDALE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and power lines down.

Thunderstorm Wind in HILLSDALE, MICHIGAN
From 18-JUN-10 20:43:00 to 18-JUN-10 20:44:00 (EST-5)
Location: HILLSDALE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Numerous trees down.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 17:43:00 to 18-JUN-10 17:44:00 (EST-5)
Location: (BEH)ROSS ARPT BNTN
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 17:49:00 to 18-JUN-10 17:50:00 (EST-5)
Location: GALIEN
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Thunderstorm Wind in CASS, MICHIGAN
From 18-JUN-10 18:24:00 to 18-JUN-10 18:25:00 (EST-5)
Location: VANDALIA
Magnitude: 59.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Power was also out along M-60.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 18-JUN-10 18:36:00 to 18-JUN-10 18:37:00 (EST-5)
Location: THREE RIVERS ARPT
Magnitude: 69.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Peak wind measured at KHAI.

Thunderstorm Wind in BERRIEN, MICHIGAN
From 18-JUN-10 18:40:00 to 18-JUN-10 18:41:00 (EST-5)
Location: ST JOSEPH
Magnitude: 52.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in BRANCH, MICHIGAN
From 18-JUN-10 18:47:00 to 18-JUN-10 18:48:00 (EST-5)
Location: SHERWOOD
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire department estimates gusts of 60 to 70 mph with numerous trees down.