Todd Heitkamp, a National Weather Service meteorologist, said the line of storms appeared to coalesce into a derecho around Sioux Falls.

A moderate threat for severe storms is in place for parts of South Dakota and Minnesota on Monday afternoon into the evening due to the threat of a derecho, a wind storm that can cause significant damage.

A powerful line of thunderstorms is expected to sweep across a large portion of the U.S. Midwest Monday, bringing strong winds, baseball-sized hail, and a risk of tornadoes. On top of that, the storm complex could result in a derecho,