A massive winter storm driven by a weakened polar vortex has swept across the United States, killing at least seven people ...

"Potentially hundreds of thousands of people may go without electricity and heat for days, one meteorologist said ...

The North Pole is surrounded by a massive circular upper-air weather phenomenon in the Arctic called the polar vortex. It is ...

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

Despite being notorious for bringing brutal cold and dangerous wind chills, the polar vortex has a surprising upside.

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

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

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

The United States is facing a storm unlike any seen in a long time. The National Weather Service has confirmed a blast of ...

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

"Bitter cold could linger through the end of the month," the Weather Prediction Center said in an update on Monday.

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