Thunderstorms began to develop across portions of southern Minnesota the night of August 7th before midnight. A strong low level jet and deep moisture advection caused several waves of thunderstorms to develop along a line from near Hutchinson Minnesota, to the southern Twin Cities metro area, and into portions of west central Wisconsin. Two to four inches of rainfall was common in a 6 hour period, with locally four to six inches in a narrow band from the southwestern portions of the Twin Cities to portions of West Central Wisconsin, from Prescott to Eau Claire.

Hail in ST. CROIX, WISCONSIN
From 08-AUG-09 10:05:00 to 08-AUG-09 10:10:00 (CST-6)
Location: EMERALD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Heavy Rain in PIERCE, WISCONSIN
From 08-AUG-09 00:00:00 to 08-AUG-09 07:00:00 (CST-6)
Location: RIVER FALLS ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The River Falls Airport recorded 5.52 inches of rainfall, and most of it fell between midnight and 7 am.

Thunderstorm Wind in POLK, WISCONSIN
From 08-AUG-09 07:40:00 to 08-AUG-09 07:40:00 (CST-6)
Location: EAST FARMINGTON
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The local law enforcement officials reported a tree blown down and blocking 10th Street, west of County Road 35, or approximately two miles south of East Farmington, Wisconsin.

Heavy Rain in EAU CLAIRE, WISCONSIN
From 07-AUG-09 23:30:00 to 08-AUG-09 01:30:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Torrential rainfall and ponding of water in streets were reported by the local media around Eau Claire, Wisconsin.

Heavy Rain in PIERCE, WISCONSIN
From 07-AUG-09 23:30:00 to 08-AUG-09 01:10:00 (CST-6)
Location: PRESCOTT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported several inches of rainfall over a short period of time around Prescott, Wisconsin.

Thunderstorm Wind in POLK, WISCONSIN
From 08-AUG-09 07:47:00 to 08-AUG-09 07:47:00 (CST-6)
Location: HORSE CREEK
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The local law enforcement officials reported trees blown down across Highway X, west of Horse Creek, Wisconsin.

Hail in ST. CROIX, WISCONSIN
From 08-AUG-09 07:40:00 to 08-AUG-09 07:40:00 (CST-6)
Location: STAR PRAIRIE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning in DUNN, WISCONSIN
From 08-AUG-09 01:00:00 to 08-AUG-09 01:00:00 (CST-6)
Location: MENOMONIE
Property damage: 65.00K
Crop damage: 0.00K
Reported by: Newspaper

Lightning struck a pine tree which fell on a home in Memomonie, Wisconsin and caused a house fire.

Flash Flood in DUNN, WISCONSIN
From 08-AUG-09 02:00:00 to 08-AUG-09 05:00:00 (CST-6)
Location: EAU GALLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

Trees washed out of banks and onto roads, branches that plugged culverts caused water to flow onto roads and produce damage to shoulders.

Flash Flood in PEPIN, WISCONSIN
From 08-AUG-09 02:00:00 to 08-AUG-09 05:00:00 (CST-6)
Location: DURAND
Flood cause: Heavy Rain
Property damage: 200.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Several gullies washed out, damaging infrastructure.