Officials urge Americans to stay indoors as historic winter storm creates "catastrophic" ice conditions and triggers the largest weather alert ever.

The winter storm is moving offshore but much of the eastern part of the country faces ice, bitterly cold temperatures and wind chill.

Roughly a million power outages were reported on Jan. 25 as a massive winter storm raged across the country, bringing "catastrophic" ice accumulation that downed power lines and created treacherous road conditions.

A massive winter storm headed towards the northeast United States on Sunday after sweeping across much of the country, threatening tens of millions of Americans with blackouts, transportation chaos and bone-chilling cold.

Winter storm: Death toll rises as winter storm continues dumping snow across the U.S Heavy snow, sleet and freezing rain are slamming large parts of the U.S. as the dangerously cold weather causes major power outages and travel disruptions.

An estimated 10,000 flights have been canceled and more than 600,000 people are without power as a wicked weekend winter storm rolls across the country.

There have been flight cancellations and delays since Friday at Fresno Yosemite International, according to the airport spokesperson.

More than 200 million people are under winter storm threats as officials brace for power outages and travel difficulties.

Experts tell TIME there's a thin line between being prepared and panic buying, and other people have a lot to do with it