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

Reporters from across the NPR Network are covering the storm in each state — the impact and how officials are responding.

Deep snow extending from Arkansas to New England halted traffic, canceled flights and triggered wide school cancellations Monday.

While some additional snow is expected to fall Monday, frigid conditions will be the primary concern in the coming days.

A colossal winter storm that hit the United States on Friday is causing severe disruption and traffic chaos across the country. View on euronews

By Shivansh Tiwary Jan 26 (Reuters) - A powerful winter storm sweeping across much of the United States forced airlines to cancel thousands of flights and delayed hundreds on Monday, as freezing rain and heavy snowfall disrupted travel and snarled transportation networks.

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.

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.