A line of storms related to a severe weather system was marching across the Southeastern United States on Sunday, a day after a tornado and storms killed three people in Texas and Mississippi.

Heavy rain and severe thunderstorms capable of producing tornadoes, damaging wind and hail were possible from the eastern Gulf Coast northward into the Carolinas on Sunday, according to the National Weather Service’s Weather Prediction Center.

Storms producing tornadoes are rarely seen in the Southeast this time of year, Christopher Rainer, a meteorologist with the Weather Center in Jackson, Miss., said on Sunday.

“We don’t get many of these type of outbreaks, at least here in the Southeast, at least not around the month of December,” Mr. Rainer said.

Mr. Rainer said that parts of North Carolina were under a severe thunderstorm watch on Sunday afternoon, and that tornado watches were in effect for portions of northern Florida and southern South Carolina.

He added that the impact from the weather system on Sunday would likely be less severe than the damage on Saturday because the system had weakened overnight.