US forecasters are warning that the freezing weather is heading east
North America's brutal cold snap is heading east, ushering in dangerous temperatures not seen in two decades, warn forecasters.
From Montana to Maryland, about half of the US population has been placed under a wind chill warning or advisory.
In Canada, the province of Ontario is facing temperatures of -40C (-40F) with wind chill.
Thousands of flights have been grounded, and residents told their skin could freeze if they go outside.
People on the US north-east coast were warned to
prepare themselves for the cold front sweeping in on Tuesday from the Midwest.
Temperatures were set to plummet overnight in New York and Washington DC by as much as 45 degrees, from unseasonably clement highs a day earlier.
New York Governor Andrew Cuomo announced that parts of major highways would be closed in preparation for the extreme weather, which could see the mercury plummet to -26C (-15F) overnight with wind chill.
The polar blast was threatening crops and livestock across the American farm belt, even in the usually temperate Deep South.
The sub-zero snap was expected to reach as far south as Texas and central Florida, the National Weather Service said.
Tennessee and Kentucky were forecast to receive several inches of snow.
The weather has been blamed for at least 16 deaths in recent days, including:
- A one-year-old boy in Missouri who was killed in a car collision with a snowplough
- A worker at a Philadelphia salt storage facility who died when a 100-ft (30-m) pile of road salt collapsed on him
- An elderly Indiana woman who was found dead outside her home
- An Oklahoma man who was killed when his vehicle skidded off an icy road
- An elderly woman suffering from Alzheimer's disease who froze to death after getting lost in New York state
- Four men across Illinois who suffered fatal heart attacks while shovelling snow
Meteorologists said some 187 million people in all would be able to feel the effects of the cold snap by Tuesday.
It has been widely blamed on a shift in the weather pattern known as the "polar vortex".
In Comertown, Montana, on Monday the temperature sank to -53C (-63F) with wind chill.
The state of Minnesota saw the mercury plummet to -48C (-56F) by the same measure.
The South Pole, and Irkutsk, Siberia, by comparison, jointly basked in a relatively balmy -33C.
More than 4,500 US flights were cancelled just on Monday in the US because of the extreme weather.
JetBlue Airways suspended nearly all operations at airports in Boston and around New York City until midday on Tuesday.
The state of Minnesota and the city of Chicago, Illinois, have ordered all schools closed.
It was so cold that even the polar bear at Chicago's Lincoln Park Zoo was kept indoors, CNN reports.
Public parks were also shut as officials warned that exposed flesh could become frostbitten.
In Illinois, the National Guard used 10-tonne military vehicles to clear up after several lorries jackknifed, stranding nearly 400 vehicles. There were no fatalities or injuries reported in those incidents.
Freezing rain also caused hundreds of flight cancellations at airports in Toronto and Ottawa.
Nearly 1,000 homes in Newfoundland, Canada, were still without electricity on Monday after a power outage.
Environment Canada senior climatologist David Phillips told the Globe and Mail newspaper: "The weather gods are out to punish you."
Some parts of Canada could see as much as 23in of snow over just a few days, he said.
Ice builds up along Lake Michigan in Chicago, Illinois
A horse drinks water from a hole in a frozen water tank in Oklahoma
A woman attempts to plough her driveway in New York
A shopper fights the elements in a grocery store car park in Michigan
A lorry stranded in a ditch in Illinois
A worker in Muskegon, Michigan, clears snow from the front of local businesses
Homeless men use donated firewood to beat cold temperatures in Knoxville, Tennessee
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