The latest NAM data just became available.   It shows a QPF of 0.06 before 1 pm and a QPF of 0.20 water between 1 pm and 7 pm.   Temperatures at mid levels of the atmosphere rise above freezing in the late afternoon, changing the snow to sleet.  So all of this QPF won’t fall as snow.

Based on this data and the latest HRRR and GFS LAMPS  forecast, it looks light snow flurries in the mid morning, then light to moderate snow early afternoon.  Approximately 2 maybe 3 inches of snow before mixing with sleet and then rain early evening. The NAM data still suggests a period of sleet and freezing rain in PHL late afternoon and evening with an extended period of the same north and west of the city.  A full transition to rain by midnight as temperatures rise.

Again, the major impact will not be snow accumulation, but rather the potential for icy conditions during the late afternoon and early evening, especially areas north and west of the city.