A cold front moved through the area during the evening of August 2nd and finally brought an end to the five day heat wave that had plagued southeast Michigan. Thunderstorms, a few intense, fired up out ahead of the cold front within the unstable airmass in place across southeast michigan. The severe weather was primarily confined to areas along and just south of the I-69 corridor. This was mainly a wind event with reports of several trees blown down. Most significantly, a tropical-like airmass and repeated rounds of storms along the I-69 corridor caused flash flooding in Lapeer and Sanilac counties, with extensive damages occurring in and around the Brown City area.

Thunderstorm Wind in LAPEER, MICHIGAN
From 02-AUG-06 22:15:00 to 02-AUG-06 22:15:00 (EST)
Location: IMLAY CITY
Magnitude: 55 EG
Reported by: NEWSPAPER

A local newspaper reported several trees blown down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 02-AUG-06 21:35:00 to 02-AUG-06 21:35:00 (EST)
Location: GRAND BLANC
Magnitude: 54 MG
Reported by: TRAINED SPOTTER

A trained spotter measured a peak wind gust at 62 MPH.

Thunderstorm Wind in GENESEE, MICHIGAN
From 02-AUG-06 21:50:00 to 02-AUG-06 21:50:00 (EST)
Location: DAVISON
Magnitude: 52 EG
Reported by: NEWSPAPER

A local newspaper reported a tree blown down on a power line along Irish Rd, just south of Potter Rd.

Hail in GENESEE, MICHIGAN
From 02-AUG-06 21:40:00 to 02-AUG-06 21:40:00 (EST)
Location: GRAND BLANC
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in LAPEER, MICHIGAN
From 02-AUG-06 21:27:00 to 02-AUG-06 21:27:00 (EST)
Location: MILLVILLE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Central dispatch reported a tree blown down in Mayfield Township.

Thunderstorm Wind in LAPEER, MICHIGAN
From 02-AUG-06 19:50:00 to 02-AUG-06 19:50:00 (EST)
Location: BURNSIDE
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Central dispatch reported trees blown down in Burnside Township.

Flash Flood in SANILAC, MICHIGAN
From 02-AUG-06 23:00:00 to 03-AUG-06 11:00:00 (EST)
Location: BROWN CITY
Property damage: 1.25M
Reported by: LAW ENFORCEMENT

Thunderstorms with very heavy rain repeatedly occurred across the same areas and dumped rain at a rate of nearly 2 inches per hour. Doppler radar estimated that 5 inches of rain fell in a west to east swath across southeast Sanilac County, and as much as 10 inches in an isolated area in and around the Brown City area. A cooperative observer in Brown City actually measured 7.35 inches over a 4 hour period on the evening of August 2nd, with an additional eight tenths of an inch falling after midnight during the early morning hours of the 3rd. The most intense rain fell from about 2000 EST on the 2nd to about 0100 EST on the 3rd. Flash flooding began around 2300 EST. Many homes in the Brown City area were heavily damaged by flood waters. The entire town experienced flooding and the city manager reported 220 damage claims filed with the city. At least 3 basements were lost and and a few homes reported nearly $100K in damages. The entire lower half of the high school was flooded with 3 to 5 inches of water. Flood waters reached 3 feet deep in a mobile home park in the city. Around 0200 EST on the 3rd, the flood waters stopped rising, and by noon, the flood waters began to recede. Total property damages were estimated at $1.25M. No injuries were reported.

Lightning in GENESEE, MICHIGAN
From 02-AUG-06 21:05:00 to 02-AUG-06 21:05:00 (EST)
Location: MT MORRIS
Property damage: 2.5K
Reported by: NEWSPAPER

A local newspaper reported that a house had been damaged by fallen power lines. A tree limb, struck by lightning, fell onto the power lines causing them to break and burn a portion of the aluminum siding on the home. The burning tree and arcing power lines sent neighbors to warn the homeowners. Two men received minor injuries (indirect) when they were electrocuted after knocking on the door of the home. Total property damages, including electrical appliances, was roughly estimated at $2.5K.

Thunderstorm Wind in LIVINGSTON, MICHIGAN
From 02-AUG-06 21:24:00 to 02-AUG-06 21:24:00 (EST)
Location: COHOCTAH
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Central Dispatch reported a tree and power lines blown down.

Thunderstorm Wind in GENESEE, MICHIGAN
From 02-AUG-06 21:23:00 to 02-AUG-06 21:23:00 (EST)
Location: FLUSHING
Magnitude: 56 MG
Reported by: TRAINED SPOTTER

A trained spotter measured a peak wind gust at 64 MPH.

Thunderstorm Wind in OAKLAND, MICHIGAN
From 02-AUG-06 21:42:00 to 02-AUG-06 21:42:00 (EST)
Location: HOLLY
Magnitude: 52 EG
Reported by: TRAINED SPOTTER

A trained spotter estimated winds at 60 MPH.

Thunderstorm Wind in MIDLAND, MICHIGAN
From 02-AUG-06 19:42:00 to 02-AUG-06 19:42:00 (EST)
Location: NORTH BRADLEY
Magnitude: 52 EG
Reported by: LAW ENFORCEMENT

Central dispatch reported a tree blown down.

Flash Flood in LAPEER, MICHIGAN
From 02-AUG-06 22:45:00 to 03-AUG-06 11:00:00 (EST)
Location: COLUMBIAVILLE
Property damage: 300K
Crop damage: 1M
Reported by: LAW ENFORCEMENT

Thunderstorms with very heavy rain repeatedly occurred across the same areas and dumped rain at a rate of nearly 2 inches per hour. Doppler radar estimated that 6 inches of rain, with locally higher amounts, fell in a west to east swath across north central Lapeer County. The most intense rain fell from about 2000 EST on the 2nd to about 0100 EST on the 3rd. Flash flooding began around 2245 EST. The rain caused mass flooding to area roads. Nearly a dozen roads, between M-90 and Clear Lake Rd, were washed out and had to be closed. Crops were also severely punished. Farmers in the North Branch area reported losing over a million dollars in vegetable and sod crops. One farmer lost 120 acres of sod, estimated at $540K. Another farmer lost 35 acres of onions, estimated at around $200K. Total losses in crops due to the floods were estimated at $1M. Several homes were heavily damaged by flooding on the east side of burnside township. Total property damages, including rebuilding roads, were estimated at $300K. No injuries were reported.

Thunderstorm Wind in ST. CLAIR, MICHIGAN
From 02-AUG-06 20:22:00 to 02-AUG-06 20:22:00 (EST)
Location: SMITHS CREEK
Magnitude: 50 EG
Reported by: TRAINED SPOTTER

A trained spotter reported 6 inch diameter tree limbs down.

Hail in GENESEE, MICHIGAN
From 02-AUG-06 19:04:00 to 02-AUG-06 19:04:00 (EST)
Location: OTISVILLE
Magnitude: 0.75 
Reported by: TRAINED SPOTTER

Thunderstorm Wind in SHIAWASSEE, MICHIGAN
From 02-AUG-06 21:16:00 to 02-AUG-06 21:16:00 (EST)
Location: BANCROFT
Magnitude: 56 EG
Reported by: TRAINED SPOTTER

A trained spotter reported a tree top blown off and estimated the wind gusts at 65 MPH.