As a coast-to-coast winter storm slices across the U.S. Sunday and Monday, severe thunderstorms are expected to fire up across portions of the South on the warm side of the storm system.The severe weather threat started Sunday afternoon and will continue into the evening,

After bringing blizzard conditions to Kansas, dropping the biggest snow in years across the Midwest, and raining crippling ice across Missouri and the Ohio Valley, the ongoing winter storm is now bringing its fury to the mid-Atlantic states.