We are now in the 2nd “strong vortex event” of this extended winter season, with 10 hPa 60°N [U] exceeding the seasonal 80th percentile (41.2 m/s). Forecasts from GFS, GEFS and CFSv2 suggest the vortex will remain strong for quite some time... consistent with seasonal outlooks. pic.twitter.com/78uznZOXEG

— Dr Simon Lee (@SimonLeeWx) December 15, 2019