Frigid air that normally stays trapped in the Arctic has escaped, plunging deep into the United States for an extended visit that is expected to provoke teeth-chattering but not be record-shattering.

Batteries that power electric cars are tested rigorously in the lab and in real-world conditions before the electric vehicle ...

Donald Trump’s announcement that he not only wants the Danish territory of Greenland but that he might use military force and ...

Arctic air remains settled over southern Colorado on Wednesday with negative morning wind chills and freezing fog giving way to chilly afternoon sunshine. Another weak snowstorm arrives Thursday.

Chile, Argentina, the U.K., Norway, Australia, New Zealand and France—maintain territorial claims on the continent.

A developing winter storm is threatening to drop snow, sleet and freezing rain on parts of Texas, Oklahoma and Arkansas ...

President-elect Donald Trump wouldn't rule out military or economic coercion, saying the U.S. needs to stop China. Also a ...

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

It's a term you hear every couple of winters, when we get stuck in the coldest of cold patterns – polar vortex. But what exactly is it?