El Niño's record-breaking force could enter a chaotic dance with another wintertime powerhouse: The polar vortex.

Add Yahoo as a preferred source to see more of our stories on Google. The polar vortex explains why extreme cold still grips parts of the U.S. despite warmer winters overall. (CREDIT: Shutterstock) ...

During certain winter cold snaps, weather stations in the American Midwest and Northeast have recorded temperatures colder ...

The polar vortex just wrecked winter across America—and scientists think it's only getting stronger. Here's the wild science ...

The Mid-Atlantic is in for plummeting temps in the new year. A polar vortex, a massive pocket of frigid air that swirls in place over the North Pole, is expected to spill out and push Arctic temps ...

SEDONA, Ariz. — The rock formation known as Kachina Woman rises like an obelisk out of a cool green canyon. At its base, more than three dozen women are tucked into crevices in the rust-colored stone, ...