Anytime we get an Arctic air blast down this far south, this is an artifact of the polar vortex rearing its ugly head,” said climatologist Barry Keim .

Yes. Although this blast of Arctic air sweeping the nation has thrown Bostonians scrounging through closets to find hats, ...

Within those lobes, cold Arctic air spills over landmasses like Asia and North America. Disruptions in the polar vortex can combine with deviations in the polar jet, leading to more cold air ...