Nearly 200 million Americans are feeling the icy grip of a major winter storm linked to 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 stretched more than 2,000 miles (3,200 km) from Texas to Quebec.
A bomb cyclone, when atmospheric pressure drops, brings blizzard conditions to the Great Lakes along the US-Canada border.
In Canada, Ontario and Quebec are under the brunt of the Arctic blast, with millions without power.
Much of the country, from British Columbia to Newfoundland, was under severe cold and winter storm warnings.
The US National Weather Service (NWS) said its Friday map “shows one of the largest ranges of winter weather warnings and advisories on record”.
Temperatures fell to minus 50F (-45C) in Elk Park, Montana, while the Michigan town of Hale froze.
It was 1F (-17C) in the snow-covered community Friday night. Emily, a bartender at Smitty’s Hell Saloon, told JEE News: “It’s pretty cold here, but we’re having a hell of a time.”
In South Dakota, blizzard-stricken Native Americans burned clothing for warmth after running out of fuel, tribal officials said.
Heavy snow was forecast for parts of Pennsylvania and Michigan. Buffalo, New York, was expecting at least 35 inches (89 cm). More than eight million people remained under blizzard warnings, the NWS said.
Coastal flooding has been observed in New England, New York and New Jersey.
