But, today, it’s all about the cold. Temperatures plunged into the teens and single digits in some spots, and the snow-dusted ...

It’s the "Bleak Midwinter" in the Northern Hemisphere – so, in case you’ve been living under a well-insulated rock, cold ...

Frigid air that normally stays trapped in the Arctic has escaped, plunging deep into the United States for an extended visit ...

The polar vortex of ultra-cold air usually spins around the North Pole, but it sometimes plunges south into the U.S., Europe and Asia. Studies show that a fast-warming Arctic is partly to blame for ...

Seven US states declared emergencies owing to the polar vortex of icy air that usually circles the North Pole.