Well this clears things up:
Obviously quite a difference in outcomes and
noted substantial run-to-run variation noted in the deterministic
solutions. While the 12z GFS was a strong and western outlier, the
00z/14th GFS came in weaker and course-corrected east a bit closer
to Nantucket and the eastern MA coast; the 12Z/13th ECMWF on the
other hand was fairly close to the 12z/13th GFS, but it`s 00z/14th
solution also adjusted eastward by a significant margin, leading to
dry weather with a coastal low impacting Nova Scotia. The 00z/14th
Canadian GEM is something of a middle road