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

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 WASHINGTON -- Warm Arctic waters and cold continental land are combining to stretch the ...

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

Warm Arctic waters and cold continental land are combining to stretch the dreaded polar vortex in a way that will send much of the United States a devastating dose of winter weather later this week ...