Bundle up! Coldest air in a decade as a weakening polar vortex brings plummeting temperatures to Ontario. The polar vortex, containing some of the globe's coldest air, is descending into Ontario.

The polar vortex is set to push a blast of extreme cold into Mississippi over the weekend. Some parts of the state will see snow and ice as part of the winter storm, and Arctic air could affect the ...

Warm Arctic waters and cold continental land are combining to stretch the dreaded polar vortex in a way that will send much of the United States a devastating dose of winter weather later this week ...

This story has been edited to correct an error. Judah Cohen is affiliated with the Massachusetts Institute of Technology. Our old wintertime friend the polar vortex ...

Sedona, Arizona is known for many things: huge buttes that rise from the earth, spas, skiing, alien paraphernalia, and most interestingly, alternative healing and crystals. It's hard to miss the sheer ...

The new Midnight transmog system is here, and navigating the user interface can be a bit tricky -- luckily, we're here to ...

To understand what Americans are experiencing with this winter blast, we need to look more than 20 miles above the surface of ...

The first crewed mission around the moon in more than 50 years is coming up. Here’s how to see it at sites in and around the ...

Don't be fooled by the string of uneventful weather — the polar vortex is rebooting and will take another swing, or several, at the greater Philadelphia region, leading to a turbulent weather pattern ...

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

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