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

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest ...

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

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

A collapse in the polar vortex is letting Artic air come here. What that means, and why it happens.

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

Temperatures could fall below -20 F across certain parts of North Dakota and Minnesota.

The meteorologists said the polar vortex system is set up due north of Michigan over Canada's Hudson Bay. It's at least ...

Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of such weather.

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

Niagara Falls turns into a frozen wonderland as a powerful polar vortex pushes temperatures below -20°C, freezing mist ...