
An estimated 200 million Americans are bracing for an icy winter storm that has caused at least 12 deaths ahead of the holiday weekend.
More than 1.5 million people lost power and thousands of flights were canceled on Friday.
The massive storm stretches more than 2,000 miles (3,200 km) from Texas to Quebec.
Much of the country, from British Columbia to Newfoundland, was under extreme cold and winter storm warnings, writes the BBC.
The US National Weather Service (NWS) said its Friday map "depicts one of the largest scales of winter weather warnings and advisories ever."
Temperatures in Elk Park, Montana, fell to -50F (-45C), while the town of Hell, Michigan, froze.
It was 1F (-17C) in the snow-covered community Friday night.
Emily, a barmaid at Smitty's Hell Saloon, told the BBC: "It's very cold in here."
In South Dakota, Native Americans burned clothing to keep warm after running out of fuel, officials said.
Heavy snow is forecast for parts of Pennsylvania and Michigan.
Buffalo, New York, expected at least 89 cm.
More than eight million people remained under storm warnings, the NWS said.
Even milder states Louisiana, Alabama, Florida and Georgia were experiencing hard freeze warnings.
Travel problems across the country were being exacerbated by a shortage of snowplow operators.
More than 5,600 U.S. flights were canceled Friday, according to the tracking site FlightAware.
As of Friday evening, one million customers were without power across the US, according to PowerOutage.us.
Businesses throughout the Tennessee Valley were implementing rolling blackouts to conserve power.