That storm on the Euro/GFS/ensembles in the second week of January is a monster. A bit of a shame that moisture is cut off by the preceding system about 36-48 hours prior, but the ensembles are pretty locked it for high impact potential across a pretty large expanse of real estate.
One may be concerned about the degree of suppression if all of the cold becomes involved at once, the STJ dominates, and/or the surface reflection isn’t as strong initially.