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 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 ...

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 ...

As they describe it, the polar vortex circles the north pole counterclockwise. the polar jet stream circles at a lower level of the atmosphere, which usually keeps Arctic air corralled in the middle.

(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 ...

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A lobe of the polar vortex will arrive in the United States this weekend, bringing the lowest temperatures in years and snow and ice to the East and Deep South.

The National Weather Service in Springfield said Wednesday afternoon that it is putting Southwest Missouri and Southeast Kansas under a winter weather advisory from 5 p.m. Thursday to 6 p.m.

These severe cold events occur when the polar jet stream – the familiar jet stream of winter that runs along the boundary between Arctic and more temperate air – dips deeply southward, bringing the cold Arctic air to regions that don’t often experience it.