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

Meteorologists warn that the coldest burst of Arctic air this season is coming to put an icy and prolonged exclamation point ...

A cooler day is expected as clouds continue to hang over the region. A polar jet stream from the north has dropped into the ...

The coldest weather of the season to date will be due to a phenomenon called a polar vortex, an upper-level jet stream that typically circulates around both the North and South Poles, but can push ...

WASHINGTON, Jan 21 (Reuters) - In Earth's upper atmosphere, a fast-moving band of air called the jet stream blows with winds ... degrees Celsius), with its polar regions less hot than the rest.

The coldest weather of the season to date will be due to a phenomenon called a polar vortex, an upper-level jet stream that typically circulates around both the North and South Poles, but can push ...

Brits could face several inches of snow in the coming days according to shocking new weather maps, with forecasters also ...

As the jet stream swung south ... This puts more moisture into the atmosphere. "When a cold front or polar air mass moves into a region like Florida, this excess moisture can translate into ...

Maps show what to expect as the cold front arrives. The polar vortex is a large area ... During the winter months and when the jet stream allows, this cold air can drop farther down into lower ...