A sweeping storm system moving across the U.S. threatens to bring tornadoes, blizzards and possibly wildfires to different regions of the country.

Over the next week, tens of millions of Americans will be at risk of severe weather as a colossal storm marches across the country, threatening hurricane-force winds, major flooding, blizzard conditions and a possible tornado outbreak.

Another unusually intense March storm is coming this week, and it may cause a bit of déjà vu, with severe thunderstorms, heavy rain, powerful wind gusts, wildfire risks and blizzard conditions possible across the country.