Some continuing suggestions from extended-range models of a weakening trend in the stratospheric vortex mid-December. Today's CFSv2 has 3 members going for a major SSW in January, but more importantly a below-average mean. Eagerly awaiting tonight's ECMWF extended-range! pic.twitter.com/Hf67uyr34K

— Dr Simon Lee (@SimonLeeWx) November 26, 2020