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

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.

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.

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

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.

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

Find out which flights have been canceled or delayed at Sacramento International Airport as a winter storm rages across much of the rest of the United States.

A number of Florida cities, including Tallahassee, deployed crews as Winter Storm Fern dumps snow and ice over more than two dozen states.