Add Yahoo as a preferred source to see more of our stories on Google. Get ready for some much colder weather. Forecasters are calling for a return of the polar vortex in the coming days and weeks.

You’ve almost certainly heard of the polar vortex. But what about "sudden stratospheric warming," a weather term that’s started making the rounds on social media? They’re related to one another, and ...

President Trump delivers the State of the Union to Congress. by SETH BORENSTEIN AP Science Writer It's as if the world has been turned upside-down, or at least its weather. You can blame the ...