Michigan's spring severe weather season is just starting. Here's what you should know about weather alerts and meanings.

Thunderstorms, large hail, destructive wind gusts and strong tornadoes threaten up to 73 million people across the Mississippi, Ohio and Tennessee Valleys on Sunday. By evening, Michigan ...

The storms are packing quarter-sized hail (1 inch). "At 3:35 a.m., a severe thunderstorm was located near Littleville, or 7 miles south of Tuscumbia, moving east at 35 mph," says the weather service.