Forecasters have said parts of the U.S. can expect frigid temperatures in December. A first round has arrived, and more cold ...

Such events distort the polar vortex, which causes Arctic air to descend into the U.S. and causes temperatures to plummet.

More than 18 million people across the West and Midwest are under winter weather alerts in the United States.

It was so shockingly cold that there were short-lived fears of a new ice age. Scientists think human activity contributed to ...

Snow leads to chilly Sunday ...

Many viruses, including rhinovirus — the usual culprit in the common cold — and influenza, remain infectious longer and ...

A late-November cold snap sent temperatures in Minneapolis so low that, for a short time, it was actually colder than Mars, ...

By Steve Gorman Dec 5 (Reuters) - A blast of Arctic air gripped much of the central and eastern portions of the U.S. on ...

Around 19 million people across the West and Midwest are under winter alerts as heavy snow and strong winds sweep through the regions ...

Bitter cold is taking hold across the U.S. on Thursday, with millions waking up to freezing temperatures and in some areas, ...

Thousands of U.S. flights have been delayed as a storm system moves across the country. Related Video Above: Flight Delays & ...

The two periods of light snow also will affect two different areas. The first snow shower burst will roll across northern ...