A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans. See maps of the arctic blast.

According to the National Weather Service, a polar vortex will impact most of the country this weekend, here is what you need to know.

A polar vortex is slated to sweep most of the continental US bringing winter storm warnings and a hazardous freeze to millions.

A polar vortex is currently hitting the United States, with schools closed in many areas and at least four deaths caused by treacherous conditions.

Some experts say the Frigid air that normally stays trapped in the Arctic escaping is happening more frequently because of a warming world.

Then, catastrophe in California, with wind-whipped flames ... That means more energy bouncing off and warping or moving the polar vortex, scientists say. And climate change is also messing with ...

A blast of Arctic air is set to cover much of the United States with temperatures below freezing starting on Friday and into next week, impacting millions of Americans in nearly all of the contiguous states.

The polar vortex is a long-established weather term ... To the west of that plunge, in California, it's hot and dry. But to the east and just above the dip, it's a taste of the North Pole.

A huge swathe of the US has been hit with ice, snow and wind as the polar vortex that dipped south over the weekend kept much of the country in its frigid grip, making many roads treacherous, forcing school closures,

Southern California had two decades of drought that ... snow and wind as the polar vortex that dipped south over the weekend kept much of the country in its frigid grip, making many roads ...

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A dangerous and potentially life-threatening stretch of cold weather has much of the U.S. on alert as a lobe of the polar vortex invades the nation and sends temperatures tumbling to levels not seen in years.