NORFOLK, Va. — Have you ever wondered why some winters are mild while others bring freezing temperatures and snowstorms? One of the key players in these dramatic shifts is something called the polar ...

The winter travel season in the U.S. is off to a bone-chilling start. Meteorologists are warning that a polar-vortex–driven blast of arctic air is poised to push unusually cold temperatures and ...

Getting your Trinity Audio player ready... More than 500 flights were delayed or canceled at Denver International Airport on Monday as a polar vortex continued to freeze Colorado. There were 529 ...