Another remarkably strong 10 hPa stratospheric vortex forecast from today's ECMWF extended-range. Ensemble mean is far above model climate mean, effectively a "strong vortex" for the whole forecast (> ~40 m/s) & exceeds 90th percentile of model climate in late Jan/early Feb ‼️ pic.twitter.com/tnX4l5vFyM

— Dr Simon Lee (@SimonLeeWx) December 28, 2021