In my posts earlier yesterday I discussed the key features, mostly upstream, that would influence the shortwave and the opportunity for it to turn the corner enough. The Canadian ens was depicting the best outcome, but has since trended towards the GEFS. The latest Euro/EPS gets it done by bringing a vortex in over the top- perfectly timed so as not to dampen the wave- and provides confluence that places HP at the surface in a favorable spot so it's a bit colder as the wave comes up along the coast. Thread the needle type deal. The big picture synoptics at that time are the strengthening vortex near AK with the PNA ridge shifting east and evolving into a large area of +heights over the eastern half of the US with moderating temps. The pattern is transitioning from cold to mild over the east. At this range nothing is etched in stone, so there is still a chance this could work out.