The cause of the week-long deep freeze? A polar vortex collapse. Now, meteorologists are calling for another collapse in the middle of March, one that could plunge the U.S., Canada, and parts of ...

It's similar to the polar vortex pattern from the winter that turned ... though people in Oklahoma and Arkansas will need to break out pants, too. Meanwhile, the usually temperate Pacific ...

Some computer models are hinting at a potentially far more formidable shot of cold weather during the second week of December, with a lobe of the polar vortex rotating south out of Canada ...

A satellite image shows the entry of a large area of low pressure, from the Polar Vortex, into the Northern U.S., on Jan. 6, 2014. (Bloomberg) -- High in the atmosphere above the North Pole ...