Forecasters warn that a split polar vortex is set to bring a 'large supply of cold air' to North America in mid-February as a ...

Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...

A significant meteorological event is poised to impact vast regions of the United States. The polar vortex, a large area of low pressure and cold air surrounding the Earth’s poles, is expected to ...

A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...

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

A lobe of the polar vortex, a stormy ring that typically keeps the coldest air locked up near the North Pole, will dip southward into the United States this weekend into next week. Polar air ...

With last week's freeze being the second time temperatures dipped below freezing this winter, many are wondering if this ...

As we continue to warm moving into February, it appears latest trends suggest a classic "what goes up, must come down" type ...

A strong polar vortex in the stratosphere has brought subzero temperatures to the Midwest, Mid-Atlantic and deep into the South.

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 ... be held inside the United States Capitol Rotunda.

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Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around ...