After a warm front mixed northward across northern Michigan during the day, a weak shortwave progressing overhead helped initiate storms along a weak boundary over Lake Michigan. This line of storms tracked eastward across the area, producing damaging winds into the early morning hours of 8-11. Training storms across parts of NW lower Michigan also produced heavy rainfall and flash flooding in multiple locations, including washing out a roadway in Antrim county that resulted in one injury.

Thunderstorm Wind in GRAND TRAVERSE, MICHIGAN
From 10-AUG-21 21:37:00 to 10-AUG-21 21:37:00 (EST-5)
Location: TRAVERSE CITY
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Tree down across Hartman Rd near US-31. Report from TV 7/4.

Thunderstorm Wind in LEELANAU, MICHIGAN
From 10-AUG-21 21:17:00 to 10-AUG-21 21:40:00 (EST-5)
Location: EMPIRE
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and powerlines down countywide between approximately 1017 PM and 1040 PM.

Thunderstorm Wind in BENZIE, MICHIGAN
From 10-AUG-21 21:27:00 to 10-AUG-21 21:27:00 (EST-5)
Location: LAKE ANN
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and powerlines downed.

Flash Flood in LEELANAU, MICHIGAN
From 10-AUG-21 23:21:00 to 10-AUG-21 23:21:00 (EST-5)
Location: SOLON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Water rushing over the road roughly 6 inches deep at the intersection of Gallivan and Alpine roads. Report from 7/4 News.

Thunderstorm Wind in OGEMAW, MICHIGAN
From 10-AUG-21 23:30:00 to 10-AUG-21 23:30:00 (EST-5)
Location: PRESCOTT
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Numerous trees and power lines down in Skidway/Prescott area of Ogemaw county.

Flash Flood in ANTRIM, MICHIGAN
From 11-AUG-21 00:00:00 to 11-AUG-21 00:00:00 (EST-5)
Location: ALDEN
Flood cause: Heavy Rain
Property damage: 325.00K
Crop damage: 0.00K
Reported by: Department of Highways

Alden highway completely washed out near Comfort Rd. Two vehicles fell into road wash out causing injury to 1 person. Multiple other road sections washed throughout county.

Thunderstorm Wind in GRAND TRAVERSE, MICHIGAN
From 10-AUG-21 21:30:00 to 10-AUG-21 22:00:00 (EST-5)
Location: (TVC)TRAVERSE CITY A
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: State Official

Widespread tree and powerline damage countywide between approximately 1030 and 1100 PM.

Thunderstorm Wind in LEELANAU, MICHIGAN
From 10-AUG-21 22:00:00 to 10-AUG-21 22:00:00 (EST-5)
Location: BINGHAM
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station minwm 0.8 NE Bingham.

Thunderstorm Wind in CRAWFORD, MICHIGAN
From 10-AUG-21 22:30:00 to 10-AUG-21 22:30:00 (EST-5)
Location: FREDERIC
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees and powerlines downed.

Thunderstorm Wind in ARENAC, MICHIGAN
From 10-AUG-21 23:30:00 to 10-AUG-21 23:30:00 (EST-5)
Location: ALGER
Magnitude: 50.00 EG
Property damage: 8.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Multiple reports of trees and powerlines down throughout the county. Roof blown off of a barn as well.

Hail in LEELANAU, MICHIGAN
From 10-AUG-21 21:45:00 to 10-AUG-21 21:45:00 (EST-5)
Location: GREILICKVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Report from 7/4 News.

Flash Flood in ANTRIM, MICHIGAN
From 11-AUG-21 00:32:00 to 11-AUG-21 00:32:00 (EST-5)
Location: BELLAIRE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Water over M-88 in multiple locations.

Thunderstorm Wind in GRAND TRAVERSE, MICHIGAN
From 10-AUG-21 22:00:00 to 10-AUG-21 22:00:00 (EST-5)
Location: YUBA
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Mesonet station miwmt in Williamsburg.

Thunderstorm Wind in KALKASKA, MICHIGAN
From 10-AUG-21 21:55:00 to 10-AUG-21 22:25:00 (EST-5)
Location: KALKASKA
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Widespread tree and powerline damage over northern half of Kalkaska county between approximately 1055 and 1125 PM.

Thunderstorm Wind in GLADWIN, MICHIGAN
From 10-AUG-21 23:13:00 to 10-AUG-21 23:13:00 (EST-5)
Location: GLADWIN
Magnitude: 50.00 EG
Property damage: 7.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Sporadic tree damage and powerlines down throughout the county. Time based on radar.

Flash Flood in LEELANAU, MICHIGAN
From 10-AUG-21 23:20:00 to 10-AUG-21 23:20:00 (EST-5)
Location: EMPIRE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water up to 6 inches deep flowing over some roads around Empire.