The tenth and coldest polar vortex of the season is blasting across the US this week. More than 58million Americans are under National Weather Service cold warnings from the US-Canada border to as ...

There's also some debate in the weather community if this a true polar vortex: The weather service forecast offices in Chicago and State College, Pa., both specifically called it a polar vortex ...

Every U.S. state but Hawaii, California and Florida have some or all parts forecast to have a good chance of windchills of 20 degrees or below sometime next week, the National Weather Service ...

So far, the National Weather Service is predicting that temperatures from October to December in the Northeast will be above normal, said John Quinlan, with the service's Albany office.

The Weather Channel explained on its site that what's popularly known as the polar vortex exists at a level much higher up in the atmosphere than the weather closer to the surface: "Laying the ...

Sometime next week, 89% of the contiguous United States will be below the freezing mark and 27% of the Lower 48 will be below zero (minus 18 degrees Celsius), according to National Weather Service ...