Bitter temperatures are forecast to hit swathes of the U.S. this weekend as a polar vortex—the area of cold air that ...

A wave of arctic air is infiltrating the United States, but forecasters say it will soon clear out in a warmup that will send temperatures soaring before Christmas. A winter storm is expected to bring ...

Weather alerts were in effect for several parts of the country as of Tuesday morning, as multiple states have faced snow and plunging temperatures early this week. Much of the eastern U.S. has been ...

Iowa is expected to experience the coldest temperatures in the Lower 48 due to a surge of Arctic air. A weakened polar vortex is allowing frigid air to spill into the U.S., creating a winter-like ...