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

Three separate rounds of Arctic air have already swept across the central and eastern United States through mid-December, ...

Winter hasn't even officially started, but parts of the country are already bracing for what could feel like the deep freeze of January. Mother Nature seems to have something brewing, and it's not ...

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 ...

The Polar vortex is causing temperatures to plummet dangerously across the Philadelphia region, and frostbite could become a ...

A powerful polar vortex slams an already-frozen state as NOAA warns the deep freeze could last for weeks, bringing extreme ...

A Polar Vortex brought temperatures so cold in January 2014 that it froze Niagara Falls. Signals of a rare sudden stratospheric warming in the next two weeks have some forecasting an imminent Arctic ...

The polar vortex is stirring up, bringing the earliest hints that the weather is changing as autumn has officially arrived. In the short term, this means gradual cool-downs and a more active storm ...

An April cold snap is expected to bring unusually cold temperatures to the eastern half of the US next week. The cold snap could impact new spring vegetation and lead to frost in some areas.

According to Dassault, VORTEX is a four-phase project, with Phase 1 aiming at the VORTEX-D demonstrator that's a one-third scale craft about 13 ft (4 m) long with an 8-ft (2.5-m) wingspan that will be ...