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

High above the Arctic, scientists are tracking a major change in the atmosphere this January, an event similar to what ...

The displaced polar vortex will bring prolonged periods of cold to the eastern portion of the Lower 48 through the end of ...

A fierce Arctic blast of bitterly cold air is poised to overtake much of the central, eastern and southern U.S. over the next ...

Michigan is set for several days of frigid temperatures and heavy lake-effect snow as Arctic air continues its slow march across the eastern U.S.

Severe winter chill is expected to plunge central and eastern states into below average temperatures as the polar vortex ...

Major cities across the Northeast and Midwest are facing temperatures 10-20 degrees below average, according to forecasters.

The Arctic Oscillation is a metric used to describe the strength of the polar vortex, or mass of arctic air that rotates ...

The brief respite of a January thaw is over as a significant pattern shift readies a return to harsh winter conditions across ...

Each of these lobes of the Polar Vortex will bring two or three days of bitterly cold, below-normal temperatures. We aren’t ...

During winter, as the Arctic falls into 24-hour darkness, extreme cold builds over the Pole. This helps to create a ...

Arctic air originates near the polar regions and is among the coldest air masses on Earth. It typically stays locked in ...