The intense cold snap about to settle over most of Canada and the U.S. has been dubbed a “polar vortex’, but Environment Canada Senior Climatologist David Phillips says it could just as easily be called “Arctic air or Siberian air.”

The most unusually cold air in the Northern Hemisphere will be over the United States early next week, bringing dangerously frigid conditions.

Some areas of the U.S. may see temperatures as low as -20 or -30 degrees early next week as arctic air from Siberia rolls in.

The polar vortex will soon elongate over North America with a dangerous cold moving into sections of Canada and the U.S.

The plunging polar vortex brought subfreezing temperatures ... along Texas’ border with Mexico, to 31 degrees, with an expected wind chill factor ranging from 0 to 15 degrees early Wednesday ...

A mix of sleet, snow and freezing rain is expected to fall on a stretch of the U.S. from New Mexico to Alabama starting ... with employees working remotely. The polar vortex of ultra-cold air ...

A mix of sleet, snow and freezing rain is expected to fall on a stretch of the U.S. from New Mexico to Alabama starting ... and North Carolina coasts. The polar vortex of ultra-cold air usually ...

(AP) — The plunging polar vortex brought subfreezing temperatures ... along Texas’ border with Mexico, to 31 degrees (minus 0.5 Celsius), with an expected wind chill factor ranging from ...

A lobe of the polar vortex, a stormy ring that typically keeps ... moist air of the Gulf of Mexico and the western Atlantic Ocean. After a slow start to the snow season in December, parts of ...

A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar vortex invades the nation and sends temperatures tumbling to levels not seen in years.

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However, a deep freeze, thanks to the polar vortex dipping down from Siberia, is about to bring even harsher arctic blast to nearly 300 million Americans starting this weekend. Maps show where and when the cold front will arrive.