More than 40 million Americans are in the threat zone through Saturday night, stretching from Texas to the Carolinas.

North Texas is facing a significant severe weather event Sunday night, with the potential for widespread damaging winds, large hail, and possible tornadoes.

It's First Alert Weather Day as the team tracks the potential for two rounds of strong to severe storms. The first round develops ahead of a dryline with isolated storms in the Northwest areas starting around 3 p.m. and moving into the Metroplex closer to 6 p.m. - 9 p.m.