Pretty clear in the extended term where guidance is taking the more substantial cold air related to the SSW/#PolarVortex breakdown. The primary lobe of the stratospheric polar vortex is forced into Europe/Asia. -NAO will help, but looking "cool" rather than "cold" for the E. US. pic.twitter.com/rx9RdLNIlM

— Bret Walts (@BretWaltsWx) January 4, 2021