At least two died as a severe weather system continued to move east, threatening to whip up tornadoes in parts of the U.S. Southeast.

A powerful storm front spawned multiple tornadoes in the Greater Houston metro area Saturday afternoon, officials said.

Possible thunderstorms could bring isolated tornadoes into Saturday night in Tennessee, Texas, Louisiana, and Georgia, according to media forecasting company AccuWeather. It said that showers with thunder and lightning may move toward the Southeast and mid-Atlantic by the weekend’s end.