Research has found that rising temperatures in the Arctic are weakening weather systems that normally trap the cold around the poles, making winter weather more chaotic.

The polar vortex can be a powerful source of winter weather, but it's not the only cause of severe cold and snow in regions better known for warmth and sunshine. The Gulf Coast states are still digging out of the snowdrifts, but at least warmer temperatures are on tap heading into the weekend.

A winter storm sweeping through the U.S. South on Tuesday was dumping snow at levels millions of residents haven’t seen before. Moisture from the Gulf of Mexico was combining with a

BOSTON (AP) — Residents across the country from the Northern Plains to the tip of Maine are bracing for dangerously low temperatures as tens of millions of residents along the East Coast contend with a thick blanket of snow — and more snowfall in the forecast.

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A rare winter storm is expected to bring heavy snow, sleet and freezing rain to Florida, Texas and other parts of the South next week. While some uncertainty remains over exactly how much snow will fall,

As happened earlier this month, this latest cold snap comes from a disruption in the polar vortex, the ring of cold air usually trapped about the North Pole. The cold air will moderate as it moves southward and eastward, but the central and eastern U.S ...

These conditions are all thanks to a familiar sounding occurrence: the polar vortex, a large area of low pressure and cold air that surrounds the Earth's poles. The "vortex" is the ...