Indications of a Scandi-Greenland dipole event in the latter stages of GEFS & GFS. Associated with a poleward-protruding anticyclonic wave break, this pattern drove the 2018 SSW (https://t.co/wwcB4nXRqS). *However it does not guarantee a major warming* & currently none forecast. pic.twitter.com/T4VAAyT4pb

— Dr Simon Lee (@SimonLeeWx) December 17, 2019