KENTWOOD, Mich. (AP) -

The National Weather Service has confirmed that a tornado injured several people and caused significant damage to homes in western Michigan.

Brian Meade, a meteorologist in Grand Rapids, says a survey of storm damage on Monday led to the determination about the damage in nearby Kentwood. He says winds late Sunday were estimated at more than 80 mph.

The weather service received reports that a couple of buildings had partially collapsed and that the storm downed numerous trees and power lines. Storms in Michigan prompted flooding Monday.

Storms also spawned tornadoes in Iowa, where some homes were damaged. In North Dakota, weekend storms caused heavy damage at a Missouri River recreation area south of Bismarck and injured people at a lake southwest of the city.