The GEFS from Dec 19 said we'd be in major #SSW territory today - whilst the GFS sat out on its own with zonal winds ~15 m/s.
— Dr Simon Lee (@SimonLeeWx) December 26, 2018
Only one was going to be correct - it turned out to be the GFS!
The good news is the GFS & GEFS now do agree on a major SSW on Dec 31 or Jan 1. pic.twitter.com/VObWsBK9tb