A polar vortex dipping down from Siberia is bringing a cold front with frigid temperatures to millions Americans. See maps of ...
According to the NWS, the Arctic polar vortex is a powerful band of west-to-east winds that develops in the stratosphere, ...
A sweeping Arctic frontal boundary blasted out of the Rocky Mountains and northern Plains and into the Midwest on Saturday, heading toward the Gulf Coast ... mid-Atlantic United States and ...