A severe winter storm that brought freezing rain, sleet and snow to a large part of the U.S. was intensified by the polar ...

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

Water, salt, and heat all get mixed within eddies with important climate consequences, but the boundary of an eddy is hard to ...

This winter, the Northern Hemisphere has been suffering from extreme cold. In South Korea, an unusually prolonged cold wave ...

The sudden blast may come as a shock to many Americans after a mostly mild start to winter, but that warmth may be partly ...