Temperatures soaring into the 90s, coupled with dew points in the mid 70s, created a very unstable environment on August 21st. A thin convergence line fired up convection just after 6 PM EDT over Saginaw Bay. Thunderstorms continued to develop to the southwest and propagated east. This was a major severe event with hail and wind damage. There was also one tornado which moved into Livingston county from Ingham county.

Hail in GENESEE, MICHIGAN
From 21-AUG-03 19:10:00 to 21-AUG-03 19:10:00 (EST)
Location: FLINT
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Tornado in LIVINGSTON, MICHIGAN
From 21-AUG-03 20:10:00 to 21-AUG-03 20:12:00 (EST)
Location: FOWLERVILLE
Tornado F-scale: F0
Reported by: TRAINED SPOTTER

A tornado tracked along Howell-Mason road from Webberville in Ingham county to Fowlerville in Livingston county. The tornado weakened as it moved into Livingston county.

Thunderstorm Wind in LAPEER, MICHIGAN
From 21-AUG-03 21:10:00 to 21-AUG-03 21:10:00 (EST)
Location: LAPEER
Magnitude: 54 EG
Reported by: LAW ENFORCEMENT

Local law enforcement reported trees and wires down.

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 21-AUG-03 21:05:00 to 21-AUG-03 21:05:00 (EST)
Location: DEXTER
Magnitude: 54 EG
Reported by: GENERAL PUBLIC

The public reported trees down.

Hail in SANILAC, MICHIGAN
From 21-AUG-03 19:27:00 to 21-AUG-03 19:27:00 (EST)
Location: DECKERVILLE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 21-AUG-03 18:30:00 to 21-AUG-03 18:30:00 (EST)
Location: MONTROSE
Magnitude: 1.00 
Reported by: METEOROLOGIST(NON NWS)

Hail in TUSCOLA, MICHIGAN
From 21-AUG-03 18:43:00 to 21-AUG-03 18:43:00 (EST)
Location: MAYVILLE
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in LAPEER, MICHIGAN
From 21-AUG-03 19:17:00 to 21-AUG-03 19:17:00 (EST)
Location: LAPEER
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GENESEE, MICHIGAN
From 21-AUG-03 19:11:00 to 21-AUG-03 19:11:00 (EST)
Location: OTISVILLE
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated 65 mph thunderstorm wind gusts.

Hail in GENESEE, MICHIGAN
From 21-AUG-03 19:11:00 to 21-AUG-03 19:11:00 (EST)
Location: OTISVILLE
Magnitude: 1.25 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 21-AUG-03 19:12:00 to 21-AUG-03 19:12:00 (EST)
Location: FLINT
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in GENESEE, MICHIGAN
From 21-AUG-03 19:30:00 to 21-AUG-03 19:30:00 (EST)
Location: GRAND BLANC
Magnitude: 54 EG
Reported by: TRAINED SPOTTER

A trained weather spotter reported 5 inch tree limbs down.

Hail in LAPEER, MICHIGAN
From 21-AUG-03 19:45:00 to 21-AUG-03 19:45:00 (EST)
Location: LAPEER
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 21-AUG-03 18:41:00 to 21-AUG-03 18:41:00 (EST)
Location: MT MORRIS
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 21-AUG-03 18:43:00 to 21-AUG-03 18:43:00 (EST)
Location: SWARTZ CREEK
Magnitude: 1.75 
Reported by: TRAINED SPOTTER

Hail in HURON, MICHIGAN
From 21-AUG-03 18:25:00 to 21-AUG-03 18:25:00 (EST)
Location: BAD AXE
Magnitude: 1.75 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 21-AUG-03 18:55:00 to 21-AUG-03 18:55:00 (EST)
Location: GAINES
Magnitude: 1.50 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 21-AUG-03 21:20:00 to 21-AUG-03 21:20:00 (EST)
Location: SALEM
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Local law enforcement reported trees blown down.

Thunderstorm Wind in WAYNE, MICHIGAN
From 21-AUG-03 22:20:00 to 21-AUG-03 22:20:00 (EST)
Location: WYANDOTTE
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained weather spotter estimated a 60 mph thunderstorm wind gust.

Thunderstorm Wind in MONROE, MICHIGAN
From 21-AUG-03 22:05:00 to 21-AUG-03 22:05:00 (EST)
Location: CARLETON
Magnitude: 70 EG
Reported by: TRAINED SPOTTER

A trained weather spotter reported several trees down.

Hail in GENESEE, MICHIGAN
From 21-AUG-03 19:30:00 to 21-AUG-03 19:30:00 (EST)
Location: GRAND BLANC
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 21-AUG-03 21:20:00 to 21-AUG-03 21:20:00 (EST)
Location: YPSILANTI
Magnitude: 60 EG
Reported by: TRAINED SPOTTER

A trained weather spotter reported large trees down.

Hail in SHIAWASSEE, MICHIGAN
From 21-AUG-03 18:45:00 to 21-AUG-03 18:45:00 (EST)
Location: MORRICE
Magnitude: 0.88 
Reported by: TRAINED SPOTTER

Hail in GENESEE, MICHIGAN
From 21-AUG-03 19:30:00 to 21-AUG-03 19:30:00 (EST)
Location: BURTON
Magnitude: 0.88 
Reported by: GENERAL PUBLIC

Thunderstorm Wind in WASHTENAW, MICHIGAN
From 21-AUG-03 21:05:00 to 21-AUG-03 21:05:00 (EST)
Location: ANN ARBOR
Magnitude: 56 EG
Reported by: LAW ENFORCEMENT

Central dispatch reported trees down.

Hail in GENESEE, MICHIGAN
From 21-AUG-03 19:05:00 to 21-AUG-03 19:05:00 (EST)
Location: SWARTZ CREEK
Magnitude: 1.25 
Reported by: TRAINED SPOTTER

Hail in TUSCOLA, MICHIGAN
From 21-AUG-03 18:55:00 to 21-AUG-03 18:55:00 (EST)
Location: KINGSTON
Magnitude: 0.75 
Reported by: LAW ENFORCEMENT

Hail in HURON, MICHIGAN
From 21-AUG-03 19:00:00 to 21-AUG-03 19:00:00 (EST)
Location: HARBOR BEACH
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in HURON, MICHIGAN
From 21-AUG-03 19:00:00 to 21-AUG-03 19:00:00 (EST)
Location: HARBOR BEACH
Magnitude: 54 EG
Reported by: TRAINED SPOTTER

A trained weather spotter reported large tree limbs down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 21-AUG-03 19:05:00 to 21-AUG-03 19:05:00 (EST)
Location: FLINT
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained weather spotter reported a shed blown over.