Tens of millions of people across the central and southern US are at risk Tuesday of severe thunderstorms and tornadoes and fire weather on the storm’s warm side and blizzard conditions on its cold side.

ET By Karina Tsui, Robert Shackelford, Mary Gilbert and Zoe Sottile, CNN (CNN) — A powerful and sprawling storm is moving across the country and spawning severe thunderstorms with hurricane-force wind gusts that are knocking out power and causing damage Tuesday morning.