Here’s the wind chill chart. Notice the four shadings, indicating how long it will take for frostbite. When we get to wind ...

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what ...

A fierce Arctic blast of bitterly cold air is poised to overtake much of the central, eastern and southern U.S. over the next ...

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map ...

A powerful Arctic blast is sending temperatures plunging across the U.S., raising concerns about safety, energy demand, and ...

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

The brief respite of a January thaw is over as a significant pattern shift readies a return to harsh winter conditions across ...

The polar jet stream, which is affected by the polar vortex above it, has become quite wavy, allowing Arctic air to ...

This article originally published at Polar vortex sends another arctic blast barreling toward Texas. In today's edition: ...

Each of these lobes of the Polar Vortex will bring two or three days of bitterly cold, below-normal temperatures. We aren’t ...

Frigid Arctic air will grip Ontario for the remainder of January, with significantly reduced, lake-effect moderation. In some ...