A polar vortex dipping down from Siberia will bring a cold front with frigid temperatures to nearly 300 million Americans.

The most potent blast will enter the north-central U.S. on Friday, the National Weather Service warned, before roaring across much of the rest of the nation over the weekend. Arctic air will ...

Seven states are expecting heavy snow ahead of an Arctic blast that is set to descend across the U.S. beginning on Friday and lasting until early next week. On Thursday, winter weather advisories ...