Severe thunderstorms were concentrated mostly along the M-59 corridor, causing the Dream Cruise along Woodward Avenue to be cut short, as minor damage was reported. The other notable item from this event was a weak tornado reported near Chesaning in Saginaw County.

Hail in GENESEE, MICHIGAN
From 20-AUG-11 12:50:00 to 20-AUG-11 12:50:00 (EST-5)
Location: CLIO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GENESEE, MICHIGAN
From 20-AUG-11 13:06:00 to 20-AUG-11 13:06:00 (EST-5)
Location: GENESEE DUFORD ARPT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Hail in GENESEE, MICHIGAN
From 20-AUG-11 13:12:00 to 20-AUG-11 13:12:00 (EST-5)
Location: THETFORD CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GENESEE, MICHIGAN
From 20-AUG-11 13:18:00 to 20-AUG-11 13:18:00 (EST-5)
Location: THETFORD CENTER
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in GENESEE, MICHIGAN
From 20-AUG-11 13:26:00 to 20-AUG-11 13:26:00 (EST-5)
Location: OTISVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in GENESEE, MICHIGAN
From 20-AUG-11 13:26:00 to 20-AUG-11 13:26:00 (EST-5)
Location: OTISVILLE
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous trees reported blown down across Forest Township.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 20-AUG-11 14:03:00 to 20-AUG-11 14:03:00 (EST-5)
Location: CHESANING
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Three inch diameter tree branches reported down.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 20-AUG-11 14:28:00 to 20-AUG-11 14:28:00 (EST-5)
Location: BURT
Magnitude: 54.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Power poles were reported snapped.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 20-AUG-11 15:13:00 to 20-AUG-11 15:13:00 (EST-5)
Location: PINCKNEY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees were reported blown down.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 20-AUG-11 15:18:00 to 20-AUG-11 15:18:00 (EST-5)
Location: HAMBURG
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Trees and power lines reported blown down.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 20-AUG-11 15:25:00 to 20-AUG-11 15:25:00 (EST-5)
Location: RUSHTON
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Power lines were reported blown down.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 20-AUG-11 13:55:00 to 20-AUG-11 13:55:00 (EST-5)
Location: FREELAND
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 20-AUG-11 15:54:00 to 20-AUG-11 15:54:00 (EST-5)
Location: BERKLEY
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Power lines reported down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 20-AUG-11 15:58:00 to 20-AUG-11 15:58:00 (EST-5)
Location: CLAWSON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Five inch diameter tree limbs reported down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 20-AUG-11 16:10:00 to 20-AUG-11 16:10:00 (EST-5)
Location: MT CLEMENS
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter estimated a 65 mph thunderstorm wind gust.

Thunderstorm Wind in MACOMB, MICHIGAN
From 20-AUG-11 16:15:00 to 20-AUG-11 16:15:00 (EST-5)
Location: FRASER
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in OAKLAND, MICHIGAN
From 20-AUG-11 15:50:00 to 20-AUG-11 15:50:00 (EST-5)
Location: SOUTHFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 20-AUG-11 15:52:00 to 20-AUG-11 15:52:00 (EST-5)
Location: SOUTHFIELD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dozen of large tree limbs reported down.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 20-AUG-11 15:56:00 to 20-AUG-11 15:58:00 (EST-5)
Location: BERKLEY
Magnitude: 56.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

At least four trees and many tree limbs reported blown down.

Thunderstorm Wind in MACOMB, MICHIGAN
From 20-AUG-11 16:10:00 to 20-AUG-11 16:10:00 (EST-5)
Location: WARREN
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

A power pole was reported down.

Tornado in SAGINAW, MICHIGAN
From 20-AUG-11 14:00:00 to 20-AUG-11 14:04:00 (EST-5)
Location: CHESANING ARPT
Tornado F-scale: EF0
Property damage: 3.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

A storm survey conducted by the National Weather Service confirmed an EF0 tornado near Chesaning on Saturday August 20, 2011. The track began near the intersection of Mckeighan and Baldwin roads at approximately 300 pm. The tornado then tracked east and ended near the intersection of Chesaning and Stuart roads. The tornado was 100 yards wide with wind speeds up to 80 mph. Damage was mainly limited to large trees and an overturned trailer.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 20-AUG-11 15:45:00 to 20-AUG-11 15:50:00 (EST-5)
Location: ORCHARD LAKE VLG
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Dozens of large branches and trees reported down. Scattered roof damage and minor structural damage to Greenhouses.