Roche said the tornadoes damaged 40 to 60 farms, but spared communities.

A visible line of damage was also spotted in North Dakota.

The Red Cross set up a shelter, but officials said no one slept there, opting instead to stay with family, friends or in local hotels.

US meteorologists said the tornadoes developed from the same warm, frontal boundary that started in the southern plains earlier in the week and moved northward through the region.