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.

A tornado watch is now in effect for West Baton Rouge, East Baton Rouge, Pointe Coupee, West Feliciana, East Feliciana, and St. Helena parishes in Louisiana and Pike, Amite, and Wilkinson counties in Mississippi.