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A polar vortex is set to grip much of the U.S. What does that mean?
People living "basically anywhere from the Rockies eastward" will see extremely cold temperatures over the next several days, ...
120 million people could experience subzero temps soon. Where the cold will be worst.
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.
Polar vortex keeps a huge swath of the US in its icy grip
A major winter blast of snow, ice, wind and plunging temperatures in the U.S. stirred dangerous travel conditions from ...
Polar vortex keeps much of the U.S. in its icy grip
People in the U.S., Europe and Asia experience the polar vortex intense cold when it escapes the North Pole and plunges ...