Model outputs that I have been seeing show the snow arriving as light in the predawn hours Sunday and then ramping up. Regarding the GPS do you really think it will verify?
Check out the precip types on that model (RRFS). The totals shown do not match that or reflect the temperatures aloft. The snow totals are way overstated. They are basically another NAM - maybe worse.
We do need to watch the position of the 850 mb low on the Euro AI. These screenshots are from 12z and 18z. It’s getting further north and that will act to promote mid level warming.
18z Euro has a front end thump of 7-10” for coastal areas before going to a lighter wintry mix. Inland areas get 10-15”+. The main feature is SLP that is tucked into the Delmarva and southern NJ coast. This is still a significant storm for the area.