Areas north of Houston and Harris County are under a tornado watch through 6 p.m. Sunday as a powerful cold front slices through Southeast Texas.

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.

: A tornado watch has been issued for a large portion of Alabama, mainly along and west of I-65, through 4 a.m. Sunday. A tornado watch is

As severe weather remains possible for Southeast Texas, a tornado watch has been extended for three counties in the area. The National Weather Service Lake Charles has extended a tornado watch for Hardin, Jasper and Newton counties until 9 p.m. on Sunday.