The polar vortex split will help cause temperatures to plummet and potentially set the stage for some snowstorms. A recent strong "sudden stratospheric warming" event has caused the vortex to weaken. ...

We can thank an unusually strong polar vortex for our mild winter. The first two months of winter were the warmest on record across the U.S. The stronger the polar vortex, the milder our winter is. If ...

A major snowstorm pounding parts of the Midwest on Monday will give way to record-smashing cold this week as a powerful Polar Vortex drives a deep freeze across the nation. A major snowstorm pounding ...

To say that January has been a tumultuous month weather-wise would be an understatement. The month has featured a string of severe winter storms, wild temperature swings and even a few bouts of ...

NORFOLK, Va. — The plunging polar vortex brought subfreezing temperatures Tuesday to some of the southernmost points of the U.S., threatening to dump snow on parts of Texas and Oklahoma in the coming ...

ANNAPOLIS, Md. -- The United States continued to freeze through a polar vortex that brought rare cold to the southern United States and chances of freezing weather through much of the country. Ice, ...

The polar dance that caused snow to fall across the South in January has been studied for decades, but scientists still hope to answer many remaining questions. Miles above the Earth, two bands of ...

LOUISVILLE, Ky. (AP) — Harsh weather moved west on Monday as a polar vortex was expected to grip the Rockies and the northern Plains after winter storms pummeled the eastern U.S. over the weekend, ...

Winter got off to a fast start in the Lower 48 even before it was technically winter. Waves of cold gripped the eastern two-thirds of the United States and several winter storms tracked across the ...