Temperatures will start free-falling into the single digits after Friday morning, likely the deepest freeze so far this winter.

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 ...

An arctic air mass has descended into the US, and a disrupted polar vortex will keep the nation in the freezer at times deeper into December. More than 200 million people will wake up to freezing ...

Baby, it's colder than normal outside! December is off to a chillier-than-typical start for much of the country. More frosty temperatures hit parts of the north-central U.S. on Thursday, Dec. 4, and ...

What is the polar vortex? It’s a wintertime mainstay capable of flooding Canada with some of the world’s coldest air ...

CLEVELAND — The temperature outside was so cold that your fingers, toes, nose and cheeks felt like they were burning. A harsh Arctic cold wave brought record-breaking temperatures to the United States ...

New England is bracing for bitterly cold temperatures as a strong blast of Arctic air rushes into the region on Thursday, sending temperatures crashing to their coldest levels yet this season — into ...

What distinguishes this weather event from typical winter cold is its structure. Rather than a single frigid episode followed by relief, the nation faces three major cold waves staggered across the ...