A very strong line of thunderstorms moved through southeast Minnesota during the early morning hours of August 13th.  Strong winds blew down trees and some significant structural damage, while widespread heavy rain amounts of 3 to 4 inches caused some flash flooding, road closures, and rises along rivers, streams and creeks.

Thunderstorm Wind in DODGE, MINNESOTA
From 13-AUG-10 02:20:00 to 13-AUG-10 02:20:00 (CST-6)
Location: BERNE
Magnitude: 50.00 EG
Property damage: 0.25K
Crop damage: 0.00K
Reported by: Law Enforcement

The tops of some trees were snapped off.

Thunderstorm Wind in OLMSTED, MINNESOTA
From 13-AUG-10 04:30:00 to 13-AUG-10 04:30:00 (CST-6)
Location: STEWARTVILLE
Magnitude: 70.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A semi truck was blown over near the interchange of U.S. Highway 63 and Interstate 90, just north of Stewartville.

Thunderstorm Wind in WINONA, MINNESOTA
From 13-AUG-10 05:25:00 to 13-AUG-10 05:25:00 (CST-6)
Location: PICKWICK
Magnitude: 50.00 EG
Property damage: 0.50K
Crop damage: 0.00K
Reported by: Emergency Manager

Large trees were blown down.

Heavy Rain in WABASHA, MINNESOTA
From 13-AUG-10 03:00:00 to 13-AUG-10 06:00:00 (CST-6)
Location: READS LNDG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Between the hours of 3:00 a.m. and 6:00 a.m. CST, 4.30 inches of rain was measured. In this same time frame, 4.16 inches was measured in Wabasha, 3.81 inches was measured in Theilman, and 3.43 inches was measured at a location 2.5 miles south southeast of Kellogg.

Thunderstorm Wind in WABASHA, MINNESOTA
From 13-AUG-10 03:30:00 to 13-AUG-10 03:30:00 (CST-6)
Location: READS LNDG
Magnitude: 42.00 MG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Despite only measuring a 48 mph gust, several 9 inch diameter trees were blown down, one of which blocked County Road 77.  Also, some roofing material was blown off a house.

Thunderstorm Wind in WABASHA, MINNESOTA
From 13-AUG-10 03:16:00 to 13-AUG-10 03:20:00 (CST-6)
Location: LAKE CITY
Magnitude: 65.00 EG
Property damage: 1.05M
Crop damage: 0.00K
Reported by: COOP Observer

Hundreds of trees and at least a half dozen power poles were blown down throughout the city of Lake City. Damage was also reported to several homes as well as to a 100,000 bushel grain bin and a dryer at a local business. The grain bin was destroyed.

Thunderstorm Wind in OLMSTED, MINNESOTA
From 13-AUG-10 02:53:00 to 13-AUG-10 02:53:00 (CST-6)
Location: ORONOCO
Magnitude: 60.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Many large trees were blown down in the city of Oronoco.  Damage occurred to the soffit, facia, siding, and garage door of a home.  Also, a camper tumbled and was moved from its original location.

Thunderstorm Wind in OLMSTED, MINNESOTA
From 13-AUG-10 04:30:00 to 13-AUG-10 04:35:00 (CST-6)
Location: STEWARTVILLE
Magnitude: 70.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Numerous trees were blown down throughout the city of Stewartville.  Also, two mobile homes were significantly damaged by uprooted trees in the Southern Hills Mobile Home Community.  Phone service was spotty for a time, while parts of the city lost power.

Flood in WABASHA, MINNESOTA
From 13-AUG-10 05:08:00 to 13-AUG-10 08:00:00 (CST-6)
Location: BEAR VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was over U.S. Highway 63 north of Zumbro Falls.  The cooperative observer from Zumbro Falls reported that 3.20 inches of rain fell between 3:00 a.m. and 6:00 a.m. CST.

Flood in WINONA, MINNESOTA
From 13-AUG-10 05:00:00 to 13-AUG-10 07:00:00 (CST-6)
Location: WINONA
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Street flooding occurred in the city of Winona after 1.08 inches of rain fell.

Flood in OLMSTED, MINNESOTA
From 13-AUG-10 18:15:00 to 14-AUG-10 00:45:00 (CST-6)
Location: LITTLE VLY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: River/Stream Gage

Locally heavy rains pushed the Middle Fork of the Whitewater River out of its banks near the Whitewater State Park on August 13th into the early morning of the 14th. The river exceeded the flood stage by over a foot, cresting at 14.91 feet.