Here is what you need to know. The polar vortex is a large area of low pressure, cold air around the Earth's poles that blows westward during the winter and eastward during the summer. A polar ...

Global sea ice reached a new record low in February, according to the European Union's Copernicus Climate Change Service.

AccuWeather long-range forecasters are warning that a significant shift in the weather pattern could bring a blast of frigid ...

saw a low of -22°F, its coldest day since 2009. Bismarck, N.D., fell to -39°F, six degrees from its all-time coldest day. The cause of the week-long deep freeze? A polar vortex collapse.

The Canadian government has awarded contracts to Chantier Davie Canada (Davie) Inc. and Seaspan’s Vancouver shipyard to ...