It's not the high that's squashing this. It's the confluence over New England and resultant positive tilt. Need that to weaken and s/w to dive down further west. Still time.
Also -- this is mid-day in March. Need some great dynamics (read: phasing between streams) to overcome the laserbeam-like sun angle we've got now.
Total wag, but I'd still be watching if I were east of I-95 in NC or soutwest mountain folks as it comes across. Mighty big lift to get everyone in play.