Around 1 pm CDT on August 31st, a line of thunderstorms took shape between Roseau and Grand Forks. As these storms moved east of the Thief River Falls area, they increased in intensity and dropped large hail. As the line progressed through eastern Lake of the Woods County, another segment of the line strengthened and dropped large hail. A little over an hour later, just after 4 pm CDT, another cluster of storms formed over extreme southeast North Dakota. These storms tracked east-northeast, through the Fairmount (North Dakota) area, and the Fergus Falls, Battle Lake, and Wadena (Minnesota) areas. These storms also produced large hail. A lone thunderstorm cell formed over south central Grand Forks County (North Dakota) around 830 pm CDT. This storm expanded into a cluster of storms as it progressed eastward into western Polk County (Minnesota). Finally, just before midnight CDT, another lone thunderstorm just southeast of Roseau also dropped large hail.

Hail in PENNINGTON, MINNESOTA
From 31-AUG-18 13:05:00 to 31-AUG-18 13:05:00 (CST-6)
Location: GOODRIDGE
Magnitude: 1.00 
Reported by: Public

Dime to quarter sized hail fell.

Hail in LAKE OF THE WOODS, MINNESOTA
From 31-AUG-18 13:55:00 to 31-AUG-18 13:55:00 (CST-6)
Location: CLEMENTSON
Magnitude: 1.00 
Reported by: Public

Very heavy rain, dime to quarter sized hail, and gusty winds hit northwest Rapid River Township in Lake of the Woods County. Several large tree branches were blown down by the wind.

Hail in OTTER TAIL, MINNESOTA
From 31-AUG-18 16:19:00 to 31-AUG-18 16:19:00 (CST-6)
Location: BATTLE LAKE
Magnitude: 1.75 
Reported by: Social Media

The hail fell at the Fiske Lake public access.

Hail in OTTER TAIL, MINNESOTA
From 31-AUG-18 16:27:00 to 31-AUG-18 16:27:00 (CST-6)
Location: BATTLE LAKE
Magnitude: 2.00 
Reported by: State Official

Hail in OTTER TAIL, MINNESOTA
From 31-AUG-18 16:30:00 to 31-AUG-18 16:40:00 (CST-6)
Location: CLITHERALL
Magnitude: 1.25 
Reported by: CoCoRaHS

Dime to half dollar sized hail fell.

Hail in OTTER TAIL, MINNESOTA
From 31-AUG-18 16:32:00 to 31-AUG-18 16:32:00 (CST-6)
Location: CLITHERALL
Magnitude: 1.25 
Reported by: Storm Chaser

Hail in WADENA, MINNESOTA
From 31-AUG-18 16:45:00 to 31-AUG-18 16:45:00 (CST-6)
Location: SEBEKA
Magnitude: 1.75 
Reported by: Social Media

Hail in OTTER TAIL, MINNESOTA
From 31-AUG-18 16:48:00 to 31-AUG-18 16:48:00 (CST-6)
Location: HENNING
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in WADENA, MINNESOTA
From 31-AUG-18 16:59:00 to 31-AUG-18 16:59:00 (CST-6)
Location: NIMROD
Magnitude: 0.88 
Reported by: Public

The hail fell near Huntersville State Forest.

Hail in WADENA, MINNESOTA
From 31-AUG-18 17:00:00 to 31-AUG-18 17:00:00 (CST-6)
Location: NIMROD
Magnitude: 1.50 
Reported by: Law Enforcement

Hail in POLK, MINNESOTA
From 31-AUG-18 20:57:00 to 31-AUG-18 20:57:00 (CST-6)
Location: HIXON
Magnitude: 1.00 
Reported by: Public

Nickel to quarter sized hail and brief heavy rain occurred across east central Fisher and west central Lowell townships.

Hail in ROSEAU, MINNESOTA
From 31-AUG-18 22:30:00 to 31-AUG-18 22:30:00 (CST-6)
Location: MALUNG
Magnitude: 1.00 
Reported by: Social Media

Dime to quarter sized hail fell across eastern Malung Township.