Comparing 18z -> 00z -> 06z I see two trends emerging, both of which may be in our favor:
1.) High pressure over New England appears to be trending west and stronger. This will absolutely help to lock in cold air.
2.) The ensembles are trying to throw more emphasis on the coastal low, which would cut off warm air intrusion and reduce the mix or sleet risk north of US 50.
Let's see if these trends hold or improve today.