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Temperatures plunged to -30 ° C (-22 ° F) and less in parts of North America because of the extreme cold known as the polar vortex that strikes the region.
At least eight people are reported to have died in weather incidents.
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The American city of Chicago has experienced extreme cold
Unusual side effects of the American polar vortex
People working in a "polar vortex"
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Temperatures are so low that some locals are releasing images of themselves that are boiling in the air and see it instantly turning into ice.
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Temperatures of -37 ° C were recorded in North Dakota. Here, trucks are seen in icy conditions near the city of Fargo
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Chicagoers and others were asked to stay indoors if they could.
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Those who braved the elements, such as this suburb of downtown Chicago, stayed as hot as possible.
Chicago is also using fire to melt snow on the railroad to keep trains running.
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The freezing temperatures in the Great Lakes region between the United States and Canada have resulted in the formation of "cloudy streets" – parallel rows of cumulus dripping on the surface of lakes, as shown by this US weather satellite image.
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Parts of Niagara Falls in Ontario, Canada froze
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Still in Ontario, the city of Kingston has experienced snowfall. Wind chill temperatures were expected to be about -30 ° C Thursday
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The cold snap would now be heading east. Here, the Canadian city of Montreal is covered in snow
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