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

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 ...

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 ...

Rising Arctic temperatures and melting sea ice could be causing cold air to flow into the Northern Hemisphere. But not all ...

The polar vortex, a mass of cold air over the Arctic, is beginning its seasonal strengthening. A strong polar vortex typically keeps the coldest air locked near the North Pole. A weaker or wobbling ...

Much of the nation east of the Rocky Mountains is hunkered down for what could be the worst winter storm of the season.

A highly unusual disruption of the polar vortex is taking shape in the upper atmosphere this November, raising the odds of a more volatile and wintry pattern as the season ramps up. Instead of the ...

Nearly all of New England has seen its share of frigid cold days and record mountain snow so far this November — and looking ahead, we’re about to get hit with another blast of Arctic air from a ...