Severe storms batter parts of the Midwest with heavy rain, gusty winds and tornadoes that forecasters warn could spill out of the region.

Severe storms battered parts of the Midwest with heavy rain, gusty winds, and tornadoes. Two reported twisters hit near Kalamazoo, Michigan and shredded a FedEx facility.

Tornadoes are the result of wind shear, strong air currents moving at an angle. In the midwest, Lessor said, the air is much drier, and as a weather front comes in from the west, there is warm, moist air coming up from the Gulf, “and that creates the more devastating tornadoes on a more regular basis.”