Several rounds of heavy rainfall led to signficant flash flooding in portions of east-central Minnesota, and west-central Wisconsin. Several areas from Prescott, Wisconsin, northeast to River Falls and Menomonie, has several inches of rainfall in a short period of time that led to flash flooding.  Several observers reported rainfall rates as high as 2 inches per hour, with one report of 4.91 inches in less than four hours near Menomonie, Wisconsin.
In St. Croix County... emergency managers reported flash flooding in Baldwin, Woodville, Wilson, Hammond, Springfield, and Cady.  Several roadways and bridges were closed due to washouts. In Baldwin, 16 people were evacuated from an assisted living facility and were taken to a local hospital. Another 24 individuals were evacuated from an apartment complex.
In Chippewa County, roads and shoulder damage was reported, with a handful of roads closed due to washouts.
In Pierce County, Highway 63 north of Highway 29 was closed due to a bridge that was washout. County road N, north of El Paso was closed due to water over the road. Plus, Highway 10 over the Rush River was closed due to high water. Several homes along the Rush River were evacuated due to roads leading to the residences washout. The town of Martell had several reports of basement walls collapsing due to the flood waters.

In addition, some minor wind damage also occurred with some of the thunderstorm cells.

Flash Flood in PIERCE, WISCONSIN
From 10-AUG-10 22:30:00 to 11-AUG-10 02:30:00 (CST-6)
Location: RIVER FALLS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Numerous cars were stalled across the city of River Falls, Wisconsin due to rainfall amounts of three to five inches in less than 4 hours.

Flash Flood in DUNN, WISCONSIN
From 11-AUG-10 01:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: COLFAX
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Significant flooding was observed across much of the northern half of Dunn County. Roads were washed out in Colfax Township, south of Colfax. More roads were washed out in Lucas Township. Several observers reported between three and six inches of rainfall overnight across the county.

Flash Flood in PIERCE, WISCONSIN
From 10-AUG-10 22:30:00 to 11-AUG-10 02:30:00 (CST-6)
Location: PRESCOTT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Several cars had stalled due to excessive water on roadways in Prescott, Wisconsin.

Heavy Rain in POLK, WISCONSIN
From 10-AUG-10 23:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: CLEAR LAKE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An observer reported 3.25 inches of rainfall overnight.

Flash Flood in EAU CLAIRE, WISCONSIN
From 11-AUG-10 01:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: EAU CLAIRE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Major street flooding was reported on Hastings Way, and Valmont Avenue in Eau Claire, Wisconsin, which was observed to have over 8 inches of water across the road.

Flash Flood in PIERCE, WISCONSIN
From 10-AUG-10 22:30:00 to 11-AUG-10 02:30:00 (CST-6)
Location: SPRING VALLEY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Local officials reported six inches of running water over several roads in Spring Valley, Wisconsin.

Flash Flood in CHIPPEWA, WISCONSIN
From 11-AUG-10 00:30:00 to 11-AUG-10 03:30:00 (CST-6)
Location: CORNELL
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Significant street flooding was reported in Cornell, Wisconsin where storm sewers were overflowing. Overnight rainfall reports were averaging between three and five inches across the county.

Flash Flood in ST. CROIX, WISCONSIN
From 11-AUG-10 01:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: WOODVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Significant flood waters were washing over several roads in Woodville, Wisconsin. Some residents in town had flood waters in their home. A few observers reported rainfall totals overnight around six inches.

Flash Flood in POLK, WISCONSIN
From 11-AUG-10 01:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: CLAYTON
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An observer in Clayton, Wisconsin, reported basement flooding with approxmately two inches of water covering the floor.

Heavy Rain in ST. CROIX, WISCONSIN
From 10-AUG-10 23:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: GLENWOOD CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An observer reported 6.25 inches of rainfall overnight.

Flash Flood in ST. CROIX, WISCONSIN
From 11-AUG-10 01:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: BALDWIN
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

An apartment building and nursing home was evacuated due to flood waters. The southeast portion of Baldwin was hardest hit. A concrete bridge was washed out in town, along with 15 feet of roadway.

Heavy Rain in DUNN, WISCONSIN
From 10-AUG-10 23:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: CEDAR FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

An observer reported 6.00 inches of rainfall overnight.

Heavy Rain in PIERCE, WISCONSIN
From 10-AUG-10 23:00:00 to 11-AUG-10 04:00:00 (CST-6)
Location: RIVER FALLS ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

An observer reported 5.07 inches of rainfall overnight.

Thunderstorm Wind in POLK, WISCONSIN
From 10-AUG-10 18:00:00 to 10-AUG-10 18:01:00 (CST-6)
Location: ST CROIX FALLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A large tree was blown over in St. Croix Falls, Wisconsin.

Thunderstorm Wind in POLK, WISCONSIN
From 10-AUG-10 18:05:00 to 10-AUG-10 18:15:00 (CST-6)
Location: NYE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: County Official

A large tree was blown down east of Osceola, Wisconsin, and west of Amery, Wisconsin.

Thunderstorm Wind in CHIPPEWA, WISCONSIN
From 11-AUG-10 00:40:00 to 11-AUG-10 00:42:00 (CST-6)
Location: CORNELL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several 4 to 6 inch diameter tree limbs were blown down in Cornell, Wisconsin.