That nipple low is hanging out over E CT still. Should fill in shortly but that's what really screwed Kevin and NE CT overnight. A little tongue of warmth in the boundary layer - you could even see it between 9p and midnight when temperatures rose at IJD and the mesonet sites in E CT while they continued to fall HFD/BDL and points west.
Now we wait for the 700mb low to consolidated and crash the comma head to the south and east. HRRR has ~0.5" liquid from 15z-21z for Hartford!