The first of three rounds of bitter air has arrived, threatening record lows in cities from the Midwest to the Northeast.

The Upper Midwest and Northern Plains have been hit by Canada's freezing temperatures. On Thursday, Dec. 4, wind chills ...

A strong polar vortex doesn't cause cold weather — it does the opposite. Here's what to know about polar vortices, how they ...

A polar vortex broke, and severe temperatures are set to dominate most of the United States, including the Midwest, in the ...

Polar vortex disturbance is causing frigid Artic air to surge southward, bringing cold temperatures and possibly snow to many ...

The culprit behind the country’s somewhat wacky weather, or at least part of it, is the (aforementioned) probable sudden ...

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

High above the North Pole, about 10 to 30 miles above Earth’s surface, sits a massive whirlpool of icy air known as the polar vortex. Think of it as a giant spinning top of frigid air trapped by ...