Scattered severe thunderstorms capable of producing large hail and damaging winds are expected to develop Friday evening and overnight.

Another round of scattered storms overnight into Thursday morning. Then heavier, more widespread showers/storms Friday into Saturday, with a flood threat by the weekend.

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, Missouri and Mississipi each had preliminary tornado reports as a storm system slowly marched east,