NAM seems reasonable think it may be accounting for the cold air crashing and also elevation. I am very interested to see what the GFS says, but honestly it is time for short range dynamic models. Anymore shifts to the SE and region wide north and west of the Delaware River gets pasted. What is tricky in this situation you cannot salt the roads in the rain and this is CLEARLY a rain to snow event.
The rain snow line will be monitored like a hawk! The earlier the changeover the more snow you get I would think in this case.