Tens of millions of people are in the path of a major winter storm. Federal cuts threaten efforts to understand the causes of such weather.

Strong winds, frigid temperatures, and snowfall moved across several states during the course of the last few days, and for ...

Much below normal temperatures should persist across the eastern U.S. into early February before moderating slightly.

The bitter cold temperatures that have left a chill over the eastern half of the country aren’t going anywhere, as a major disruption to the Polar Vortex is coming this month.

Sudden stratospheric warming is expected to keep a weakened vortex splintered, plunging the region back to record-breaking ...

A dramatic blast of cold air may be coming for the United States in late January, courtesy of the polar vortex. Here's what could happen.

Forecasters are warning that the breakdown of the polar vortex high above the Arctic will not bring relief from winter, but ...

Meteorologists warn that a stretched polar vortex could bring severe winter weather to much of the United States.

The majority of the United States will experience chilling temperatures due to a blast of arctic air from Canada. The Midwest, Mid-Atlantic and Southern U.S. are expected to see below-freezing ...

Michigan is experiencing frigid temperatures and heavy snow due to a dip in the jet stream, not the polar vortex. The polar vortex is a large-scale cyclone of cold air that typically stays far north ...