A dangerous, wide-reaching storm is threatening tens of millions of people along nearly the entire Eastern Seaboard Monday after touching off several tornadoes, dropping baseball-sized hail and killing at least seven people in the central US this weekend.

Powerful storms are forecast to move east after pelting the central U.S. with heavy wind and giant hailstones, causing at least five deaths and leaving hundreds of thousands without power. Parts of the mid-Atlantic and the Southeast are bracing for storms that damaged buildings and whipped up tornadoes in the Midwest and Southern states.