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

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

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 ...

A giant chunk has broken off the largest iceberg in the world, which may be the first sign of its deterioration. The behemoth ...

About 230 million people will face temperatures of 20 degrees or colder and about 150 million likely will be hit by snow and ...