Up to 72 million from Texas to Michigan are under severe storm risk as heavy rains, flash flooding and strong tornadoes are forecast to hit the lower Ohio Valley and the mid-South.

A dangerous and potentially historic flood event is bearing down on 22 million Americans from Arkansas to Ohio this week.

When a warning is issued, take action. This means tornado conditions are imminent and have been spotted either by someone on the ground or by radar. Warning areas are typically smaller than those within a watch and are issued for a shorter time period, typically about 15 minutes.

The National Weather Service released a tornado watch at 2:28 a.m. on Wednesday in effect until 10 a.m. The watch is for Johnson, Clay, Jackson, Linn, Miami, Adair, Bates, Caldwell, Carroll, Cass, Chariton,

A tornado watch has been issued for the entire region until midnight. This is a particularly dangerous situation (PDS).

A wintry mix in northern Lower Michigan will change to rain by noon. For southern Lower Michigan look for numerous periods of showers and thunderstorms. The thunderstorms could be severe in the afternoon or evening.

A tornado watch was issued by the National Weather Service on Wednesday at 2:28 a.m. in effect until 10 a.m. The watch is for Leavenworth, Wyandotte, Platte, Atchison, Doniphan, Andrew, Buchanan, Clinton,