When parts of the vortex break down, lobes of Arctic air can drift south, guided by changes in the jet stream. This allows ...

It is now likely that the coldest period of sustained cold weather is behind us after gripping the Eastern U.S. for the first part of December. Warmer temperatures are expected for Christmas and into ...

Climate scientists are confronting a hard truth: some of the most widely used models are struggling to keep up with the pace ...

A Polar vortex has covered the Philadelphia region under a canopy of frigid temperatures, but many people may not realize what a Polar vortex actually is, and the dangers — like frostbite — such ...

Current forecast models show the circulation of the Polar Vortex weakening later this week into the weekend. As this occurs, cold air is expected to spread across much of the Central and Eastern U.S.

A significant disruption of atmospheric patterns around the Arctic is expected to begin any day, potentially allowing cold air to infiltrate farther south into parts of the Northern Hemisphere. The ...

High above the North Pole, in a slice of atmosphere rarely noticed and even less understood, a transformation is underway. Over the next 10 days, changes in the stratosphere will upend weather ...

In yet another sign that winter weather is either here or will be soon, the dreaded polar vortex is making news yet again. Its potential arrival in the United States over the next few weeks is cause ...

Something unusual may be brewing in the stratosphere, and meteorologists say it could change the course of the winter forecast. The atmosphere is at a "critical juncture," and what happens in November ...

CLEVELAND — The temperature outside was so cold that your fingers, toes, nose and cheeks felt like they were burning. A harsh Arctic cold wave brought record-breaking temperatures to the United States ...

A significant disruption of atmospheric patterns around the Arctic is expected to begin any day, potentially allowing cold air to infiltrate farther south into parts of the Northern Hemisphere. The ...