Convection initiated in Central Illinois and developed into a convective line as it approached Michigan. Thunderstorms developed in the warm sector ahead of the initial line and produced multiple outflow interactions. Thunderstorms in the morning of August 11 resulted in extensive tree damage as trees were snapped, uprooted, or had large limbs downed.

Thunderstorm Wind in CASS, MICHIGAN
From 11-AUG-21 11:08:00 to 11-AUG-21 11:09:00 (EST-5)
Location: UNION
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Two trees were downed onto structures. One tree fell onto a mobile home, and the second fell on a house. Several other tree limbs were downed in the area.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 11:25:00 to 11-AUG-21 11:26:00 (EST-5)
Location: WHITE PIGEON
Magnitude: 52.00 EG
Property damage: 1.20K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported trees and powerlines down in the area.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 11:25:00 to 11-AUG-21 11:26:00 (EST-5)
Location: WHITE PIGEON
Magnitude: 48.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Public

The public reported tree limbs of 1 to 2 inch diameter down. The public estimated the wind to be 55 mph.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 11:25:00 to 11-AUG-21 11:26:00 (EST-5)
Location: CONSTANTINE
Magnitude: 61.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Broadcast Media

The broadcast media report that a healthy tree, 3 feet in diameter, was uprooted in a local cemetery.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 11:30:00 to 11-AUG-21 11:31:00 (EST-5)
Location: CENTREVILLE
Magnitude: 52.00 EG
Property damage: 62.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reports 6 to 8 power poles were snapped.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 11:45:00 to 11-AUG-21 11:46:00 (EST-5)
Location: CONSTANTINE
Magnitude: 48.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Public

The public reports that large tree branches were downed.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 11:45:00 to 11-AUG-21 11:46:00 (EST-5)
Location: COLON
Magnitude: 61.00 EG
Property damage: 3.50K
Crop damage: 0.00K
Reported by: Public

Several trees uprooted or snapped measuring 1 to 3 feet in diameter. One tree fell onto a house. Part of a metal roof was damaged. Numerous limbs downed measuring 1 to 2 ft diameter in the town.

Thunderstorm Wind in BRANCH, MICHIGAN
From 11-AUG-21 11:50:00 to 11-AUG-21 11:51:00 (EST-5)
Location: COLDWATER
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

The public reports a large tree was downed onto a home.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 12:30:00 to 11-AUG-21 12:31:00 (EST-5)
Location: MENDON
Magnitude: 59.00 EG
Property damage: 0.20K
Crop damage: 0.00K
Reported by: Public

The public reports large tree branches down.

Thunderstorm Wind in ST. JOSEPH, MICHIGAN
From 11-AUG-21 12:54:00 to 11-AUG-21 12:55:00 (EST-5)
Location: STURGIS
Magnitude: 59.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

The public reports multiple large trees are down in Sturgis.