A cold front moved into the Devils Lake region during the evening of the 21st and progressed into the Red River Valley around midnight. In combination with strong upper level dynamics, a good low level jet, and modest warm advection, this event produced several reports of large hail and a few tornadoes. The storms generally weakened as they moved into northwest Minnesota.

Thunderstorm Wind in MARSHALL, MINNESOTA
From 21-JUL-13 23:50:00 to 21-JUL-13 23:50:00 (CST-6)
Location: THIEF LAKE
Magnitude: 80.00 EG
Reported by: Public

Several 1,600 pound round hay bales were tossed or tumbled across a field in northern Como township.

Thunderstorm Wind in CLEARWATER, MINNESOTA
From 22-JUL-13 00:55:00 to 22-JUL-13 00:55:00 (CST-6)
Location: BERNER
Magnitude: 70.00 EG
Property damage: 300.00K
Crop damage: 100.00K
Reported by: NWS Storm Survey

A downburst wind damage path developed across west central Greenwood Township. Numerous trees were toppled with some falling on the Greenwood Township Hall roof. A one to two mile wide swath of wind damage extended for over three miles and indicated peak winds of 60 to 80 mph.

Thunderstorm Wind in LAKE OF THE WOODS, MINNESOTA
From 22-JUL-13 02:15:00 to 22-JUL-13 02:15:00 (CST-6)
Location: CLEMENTSON
Magnitude: 91.00 EG
Property damage: 500.00K
Reported by: Emergency Manager

A microburst damage area was produced across the northeast quarter of section 30 in Rapid River Township. The downburst initiated across the southwest corner of a farmstead and projected to the east and northeast across the farmyard. A steel pole shed was torn open and demolished with debris impacted and denting several steel grain bins along the east end of the yard. Several pine trees and two power poles in the yard were snapped by the wind. Peak winds were estimated at 95 to 105 mph.

Tornado in CLEARWATER, MINNESOTA
From 22-JUL-13 00:46:00 to 22-JUL-13 00:50:00 (CST-6)
Location: BERNER
Tornado F-scale: EF1
Property damage: 50.00K
Reported by: NWS Storm Survey

This tornado began in Polk County, about one mile north of Trail, at 12:33 am CST. The tornado snapped and uprooted numerous trees along its entire seven mile path. Peak winds were estimated at 90 mph.

Tornado in POLK, MINNESOTA
From 22-JUL-13 00:33:00 to 22-JUL-13 00:46:00 (CST-6)
Location: TRAIL
Tornado F-scale: EF1
Property damage: 100.00K
Reported by: NWS Storm Survey

This tornado continued into Clearwater County before it dissipated. The tornado snapped and uprooted numerous trees along its path. Peak winds were estimated at 90 mph. The entire path length across the two counties was nearly 7 miles.

Tornado in MAHNOMEN, MINNESOTA
From 22-JUL-13 00:50:00 to 22-JUL-13 01:20:00 (CST-6)
Location: MAHNOMEN
Tornado F-scale: EF2
Property damage: 1.00M
Crop damage: 500.00K
Reported by: NWS Storm Survey

This tornado continued into Clearwater County, where it lifted at about 0130 am CST, west-northwest of Zerkel. The tornado damaged structures at three locations along the route with long tracks of tree and crop damage evident. Peak winds were estimated at 115 mph.

Tornado in CLEARWATER, MINNESOTA
From 22-JUL-13 01:20:00 to 22-JUL-13 01:30:00 (CST-6)
Location: ZERKEL
Tornado F-scale: EF2
Property damage: 750.00K
Crop damage: 100.00K
Reported by: NWS Storm Survey

This tornado began in Mahnomen County, just southeast of Mahnomen, at 12:50 am CST. The total tornado track was about 21 miles. The tornado damaged structures at three locations along the route with long tracks of tree and crop damage. Peak winds were estimated at 115 mph.

Thunderstorm Wind in HUBBARD, MINNESOTA
From 22-JUL-13 02:45:00 to 22-JUL-13 02:45:00 (CST-6)
Location: CHAMBERLAIN
Magnitude: 65.00 EG
Property damage: 100.00K
Reported by: Public

Many trees were damaged and tin roof panels were peeled off of a shed.