A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.

Around 40 million people in the U.S. are under a winter storm warning from an unusual blast of severe winter weather.

Millions of people living along the Gulf Coast and into the Southeast are bracing for a rare, significant winter storm that’s expected to significantly impact travel and lead to power outages due to heavy snow and ice starting Monday evening.