The polar vortex is a normal weather feature that usually circles within the arctic…

A Brief Meandering About the Polar Vortex (Bad Astronomy)

The polar vortex is a normal weather feature that usually circles within the arctic area. This year it dipped southward over North America, bringing extreme cold and snow to most of the continent…while Alaska experienced much milder temperatures than normal, California continued its drought, and the southern hemisphere experienced record summer heat.