A rare "daughter polar vortex" is set to plunge millions of Americans into freezing temperatures as a prolonged period of ...

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

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 ...

The vortex is essentially an area of low pressure in the upper layers of the atmosphere over the polar region up north. This ...

Most of the US will enjoy milder temperatures on Thursday, but the warmup will be brief as a polar vortex will send temperatures tumbling below freezing for most of the nation starting this ...

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

The weather flow is gradually changing now and as we head into early February. Our storm systems will come from the west and ...

The long-range data shows we may be done with a true Arctic air mass similar to what we experienced in January. But we ...

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

A strong polar vortex — and one that stays swirling tightly above the pole — depends on a dramatic contrast between frigid polar temperatures and milder conditions across midlatitudes.

The upcoming midweek storm is one of several systems that promises to bring precipitation and eventually the month's coldest ...

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