There is not blocking. There is west atlantic ridging, which could still allow for an inland track.. The cold can and will move if it takes that track.
Just check ensembles, though I'm sure GEFS will follow suite like they usually do. Keep in mind that the EURO was a whiff, so plenty to time to sort details out.
One way to pull it off is to have N stream insert as it progresses north...like a hybrid Miller A/B deal. GFS may do that, I am not analyzing H5 at hr 156. I think Feb 2013 did that.
Having H5 close off several hundred miles south of our latitude does not scream "upper end storm" to me. Can still be big, but sell these 20"+ fantasies, which is usually the course of least regret, anyway, but def. with Miller A systems.
Regardless of range, I will sell those high end amounts of the GFS right off the bat because the best we usually do on a Miller A is like 10-20". There is a ceiling on those around here.