New year, same overall story with regard to the strength of the stratospheric polar vortex: the latest run of the subseasonal ECMWF prediction system has a stronger-than-average vortex all the way into February -- with no ensemble members showing an SSW in the next 4 weeks. pic.twitter.com/nRU8kJRyfC

— Dr Simon Lee (@SimonLeeWx) January 2, 2023