To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of ...

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

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

As the U.S. prepares to take on another bout of cold weather, the term "polar vortex" is getting thrown around. But what is ...

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

What is polar vortex and how much snow is expected in US? A winter storm linked to polar vortex disruption has impacted ...