A severe weather threat extends across the Northern Plains and upper Midwest on Sunday, shifting to the Great Lakes region on Monday. Damaging winds and large hail are the main threats on Sunday, especially for cities like Bismarck, Sioux Falls and Minneapolis. On Monday, large hail and damaging winds are still a major threat, but tornadoes could also be a possibility for cities like Des Moines, Milwaukee, Minneapolis and Chicago. Here are all the details.