Polar vortex to bring triple whammy of Arctic cold to US through mid-December

The polar vortex is on the move and will take up a position near Hudson Bay, Canada, directing rounds of Arctic air southward from the North Pole to parts of the central and eastern United States through the middle of the month. The waves of Arctic air will trigger rounds of flurries and squalls in some areas and may help fuel storms with more widespread snow. The Arctic air is expected to deliver subzero temperatures from the Dakotas and...