Wrt the end of week event.. We have discussed the general setup here for awhile, and while not as cold a period as was suggested 4-5 days ago, there is still potential for a little frozen (for some). A strong HP building over eastern Canada should allow some colder air to push southward ahead of the approaching shortwave. The shortwave/ associated surface low generally looks to track NW into the OV on most guidance, GFS being further NW. At this point it appears redevelopment may occur off the MA coast- more likely if that HP is stronger/stays in place longer. It's a complex setup but one that could produce some frozen at least for a time, further N being favored ofc. That high will be sliding northeastward (quicker on the GFS) and this is right at the beginning stages of a major pattern change with limited cold available, so keep expectations in check lol.
Using the Euro(better outcome) for illustrative purposes-