December update to the 8 seasonal prediction systems contributing to @CopernicusECMWF. All the models have now converged on a positive Arctic Oscillation pattern for JFM 2022. These are very strong ensemble mean anomalies, similar in amplitude to those from Dec 2019. pic.twitter.com/882Cw5l4Tp

— Dr Simon Lee (@SimonLeeWx) December 14, 2021