The polar vortex is a broad, fast ribbon of cold air that encapsulates the Arctic high in the stratosphere. Stable, it confines cold air near the North Pole. Unstable, it is rocked and stretched out ...

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 ...

The mean first frost in the Providence is Oct. 23, but that varies by town. See the cities and towns the National Weather ...

The polar vortex is stirring up, bringing the earliest hints that the weather is changing as autumn has officially arrived. In the short term, this means gradual cool-downs and a more active storm ...

The Earth's polar vortex is stirring up, bringing the first hints of changing weather as the autumn foliage starts to turn and the temperatures begin to drop. The movement means gradual cooling and a ...

The polar vortex is a large region of low pressure and cold air that has always existed around Earth's poles. While the polar vortex is weakening for the season, it does not directly cause winter ...

Indiana can expect dry temperatures around the state at the beginning of October. Although fall kicked off earlier this week, it'll be a little while before we are affected by a polar vortex. Hoosiers ...

The polar vortex is beginning to stir, signaling a gradual shift toward cooler fall weather in the northern U.S. Tennessee is expected to see mild temperatures through December, with the average first ...

Bitingly cold Arctic air keeps pummeling the U.S. with ruthless cold snaps—despite warming winters nationwide. A study explains why: the solution lies far above your head, in the upper atmosphere ...