Well this is interesting!
— Marco Petagna (@Petagna) January 6, 2021
Following the very recent #SSW sudden stratospheric warming event 10hpa above N Pole there's continued support for a 2nd less dramatic warming in ~week's time
More significantly & one to 👀 is today's 12z GFS showing extreme warming again week 3 of Jan pic.twitter.com/9YL7M7wTpu