By late afternoon of July 17th, an area of low pressure was located over the far southern Red River Valley with a warm front extending to its east. Temperatures had topped out in the middle 80s with dew points in the lower 70s. Thunderstorms flared up along and north of the warm front, mainly affecting southeast North Dakota and west central Minnesota. Large hail was reported along with a few strong winds gusts. Heavy amounts of rain also fell along the Highway 10 corridor in west central Minnesota, mainly between Detroit Lakes and Wadena.

Hail in OTTER TAIL, MINNESOTA
From 17-JUL-10 15:35:00 to 17-JUL-10 15:37:00 (CST-6)
Location: NEW YORK MILLS
Magnitude: 1.00 
Reported by: COOP Observer

Also large tree branches of 4-6 inch diameter were broken off.

Hail in WADENA, MINNESOTA
From 17-JUL-10 15:50:00 to 17-JUL-10 15:55:00 (CST-6)
Location: SEBEKA
Magnitude: 4.00 
Property damage: 100.00K
Crop damage: 100.00K
Reported by: Newspaper

Hail ranging from 2 to 4 inch diameter fell in an area between Sebeka and Blue Grass. Hail punched large holes through a steel shop roof and broke out several windows.

Tornado in WADENA, MINNESOTA
From 17-JUL-10 16:12:00 to 17-JUL-10 16:13:00 (CST-6)
Location: VERNDALE
Tornado F-scale: EF0
Reported by: Trained Spotter

A brief touchdown occurred in an open field north of U.S. Highway 10.

Hail in BECKER, MINNESOTA
From 17-JUL-10 10:31:00 to 17-JUL-10 10:32:00 (CST-6)
Location: WHITE EARTH
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in HUBBARD, MINNESOTA
From 17-JUL-10 12:10:00 to 17-JUL-10 12:11:00 (CST-6)
Location: PARK RAPIDS
Magnitude: 1.00 
Reported by: Newspaper

Hail ranged from dime to quarter sized.

Hail in HUBBARD, MINNESOTA
From 17-JUL-10 12:20:00 to 17-JUL-10 12:30:00 (CST-6)
Location: DORSET
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail fell for 10 minutes at Camp Wilderness.

Thunderstorm Wind in CLAY, MINNESOTA
From 17-JUL-10 16:15:00 to 17-JUL-10 16:15:00 (CST-6)
Location: BARNESVILLE
Magnitude: 50.00 EG
Reported by: Public

A large tree was blown down next to the firehouse. A lot of smaller branches were also blown off trees around town.

Hail in WADENA, MINNESOTA
From 17-JUL-10 16:17:00 to 17-JUL-10 16:17:00 (CST-6)
Location: ALDRICH
Magnitude: 1.50 
Reported by: Public

Hail in WILKIN, MINNESOTA
From 17-JUL-10 16:20:00 to 17-JUL-10 16:20:00 (CST-6)
Location: BRECKENRIDGE
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in OTTER TAIL, MINNESOTA
From 17-JUL-10 16:22:00 to 17-JUL-10 16:22:00 (CST-6)
Location: SPIRIT LAKE
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in WILKIN, MINNESOTA
From 17-JUL-10 15:55:00 to 17-JUL-10 15:55:00 (CST-6)
Location: LAWNDALE
Magnitude: 1.75 
Reported by: Public

Hail in WILKIN, MINNESOTA
From 17-JUL-10 16:00:00 to 17-JUL-10 16:00:00 (CST-6)
Location: LAWNDALE
Magnitude: 1.00 
Reported by: Public

Hail in WADENA, MINNESOTA
From 17-JUL-10 16:05:00 to 17-JUL-10 16:05:00 (CST-6)
Location: WADENA
Magnitude: 0.75 
Reported by: Trained Spotter

There was also well defined rotation overhead.

Thunderstorm Wind in CLAY, MINNESOTA
From 17-JUL-10 16:05:00 to 17-JUL-10 16:05:00 (CST-6)
Location: BARNESVILLE
Magnitude: 55.00 EG
Reported by: Broadcast Media

A small ride at the Clay County fair was damaged due to strong winds.

Thunderstorm Wind in WADENA, MINNESOTA
From 17-JUL-10 16:08:00 to 17-JUL-10 16:08:00 (CST-6)
Location: ALDRICH
Magnitude: 52.00 EG
Reported by: Public

Tree branches up to 4 inches in diameter were snapped.

Thunderstorm Wind in WILKIN, MINNESOTA
From 17-JUL-10 16:47:00 to 17-JUL-10 16:47:00 (CST-6)
Location: ROTHSAY
Magnitude: 76.00 MG
Reported by: Mesonet

The wind gust was measured by a MNDOT RWIS sensor.

Hail in OTTER TAIL, MINNESOTA
From 17-JUL-10 17:00:00 to 17-JUL-10 17:00:00 (CST-6)
Location: VINING
Magnitude: 1.50 
Reported by: Public

Flash Flood in WILKIN, MINNESOTA
From 17-JUL-10 16:30:00 to 18-JUL-10 04:00:00 (CST-6)
Location: LAWNDALE
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 5.00K
Reported by: Public

Roughly 1.50 inches of rain fell in 15 minutes.

Flash Flood in OTTER TAIL, MINNESOTA
From 17-JUL-10 17:10:00 to 18-JUL-10 04:00:00 (CST-6)
Location: NEW YORK MILLS
Flood cause: Heavy Rain
Property damage: 1.00K
Crop damage: 3.00K
Reported by: Public

A flooded basement was reported.

Hail in WADENA, MINNESOTA
From 17-JUL-10 16:10:00 to 17-JUL-10 16:10:00 (CST-6)
Location: CENTRAL
Magnitude: 1.50 
Reported by: Public

Hail in WADENA, MINNESOTA
From 17-JUL-10 16:20:00 to 17-JUL-10 16:20:00 (CST-6)
Location: BLUE GRASS
Magnitude: 1.75 
Reported by: Public