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

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 plunging polar vortex brought subfreezing temperatures Tuesday to some ... along Texas’ border with Mexico, to 31 degrees, with an expected wind chill factor ranging from 0 to 15 degrees early Wednesday, according to the National Weather Service.

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

Most of the country will likely be hit by an arctic blast this weekend into early next week as the polar vortex ushers in cold ... between western Texas and Mexico, according to AccuWeather.

The Arctic polar vortex has been pushing icy winds throughout ... States included parts of Texas, Louisiana, New Mexico, Arizona, Nevada, Utah and Colorado, as well as New Jersey, Pennsylvania ...

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 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.

A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans. See maps of the arctic blast.

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People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, a meteorologist says. That includes Kansas City, which is set to host a Chiefs playoffs game this weekend.