November updates to ECMWF & UKMO seasonal forecasts of the #PolarVortex.

ECMWF has shifted to suggesting a weaker-than-normal vortex in Dec (especially) & Jan, whilst UKMO remains slightly stronger - but with a very large spread in January. pic.twitter.com/NosAVICKTH

— Dr Simon Lee (@SimonLeeWx) November 14, 2019