A strong multicell moving west to east made landfall near Ludington around 3 PM EDT. This storm then tracked due east until it reached Mount Pleasant where it took a sharp turn toward the southeast. Shortly after, a large hail core materialized dropping hailstones that measured 2 inches in diameter (lime or hen egg sized) near Brant Township after 515 PM EDT and 1.75 inch (golf ball sized) hail closer to Chesaning. The last severe hail report (1 inch) with this storm occurred just before Montrose at 545 PM EDT. The storm weakened shortly afterwards near the Flint and Lapeer areas.
A trailing line of storms rolled ashore near Silver Lake around 615 PM EDT with an eastward trajectory. These storms produced mainly damaging wind gusts as they approached the M-54 corridor around 745 PM EDT. There were several reports of trees and power lines brought down as the storms tracked east along the I-69 corridor. Storms exited east into southern Ontario before 10 PM EDT.

Hail in SAGINAW, MICHIGAN
From 12-SEP-21 16:22:00 to 12-SEP-21 16:22:00 (EST-5)
Location: BRANT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SAGINAW, MICHIGAN
From 12-SEP-21 16:34:00 to 12-SEP-21 16:34:00 (EST-5)
Location: CHESANING ARPT
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SAGINAW, MICHIGAN
From 12-SEP-21 16:38:00 to 12-SEP-21 16:38:00 (EST-5)
Location: VERNE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in SAGINAW, MICHIGAN
From 12-SEP-21 16:40:00 to 12-SEP-21 16:40:00 (EST-5)
Location: CHESANING
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Hail in GENESEE, MICHIGAN
From 12-SEP-21 16:44:00 to 12-SEP-21 16:44:00 (EST-5)
Location: MONTROSE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm Wind in SAGINAW, MICHIGAN
From 12-SEP-21 19:12:00 to 12-SEP-21 19:12:00 (EST-5)
Location: CHESANING
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines reported down.

Thunderstorm Wind in TUSCOLA, MICHIGAN
From 12-SEP-21 19:29:00 to 12-SEP-21 19:29:00 (EST-5)
Location: TUSCOLA
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Trees and power lines reported down.

Thunderstorm Wind in LAPEER, MICHIGAN
From 12-SEP-21 19:42:00 to 12-SEP-21 19:42:00 (EST-5)
Location: MILLVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees and power lines reported down in Columbiaville Vicinity.

Thunderstorm Wind in LAPEER, MICHIGAN
From 12-SEP-21 19:44:00 to 12-SEP-21 19:44:00 (EST-5)
Location: FIVE LAKES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large tree limbs down on the road.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 12-SEP-21 20:12:00 to 12-SEP-21 20:12:00 (EST-5)
Location: YALE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees and power lines down in Yale.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 12-SEP-21 20:24:00 to 12-SEP-21 20:24:00 (EST-5)
Location: MARYSVILLE
Magnitude: 55.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: 911 Call Center

Numerous trees and power lines reported down in Marysville.

Thunderstorm Wind in SAGINAW, MICHIGAN
From 12-SEP-21 18:45:00 to 12-SEP-21 18:45:00 (EST-5)
Location: ALICIA
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet