According to a forecast map shared by the agency, the states with the highest probability of seeing below average ...

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

A combination of weather conditions may make it colder than usual across parts of the Central and Northern U.S. next week.

As we head into the polar vortex, meteorologists are calling for up to a foot of snow in some parts of the U.S.

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

Thanks to the polar vortex, the first half of December will bring multiple waves of Arctic air to the U.S. Here's what to ...

After Tuesday’s snow and rain, an icy blast tied to a weakened polar vortex is about to directly strike New England, sending ...

Temperatures across Michigan are forecast to plunge to the some of the coldest in the U.S., dipping well below zero in place ...

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 ...

For folks who long for cold, the weeks after Thanksgiving might just be a tease for some intense Arctic cold that could arrive later in December.