Add Yahoo as a preferred source to see more of our stories on Google. This winter’s harsh run is intensifying, with some of the coldest air so far this season plunging into New Hampshire this weekend ...

A fresh blast of Arctic air is poised to spill across a wide swath of the United States, and the latest polar vortex map makes clear which regions are most exposed. Forecast models show a sharp ...

After a major winter storm swept across the country in late January, a prolonged surge of Arctic air tightened its grip on large areas of the U.S. pushing temperatures well below normal. From the ...