This morning’s GFS model continues with the trend of low QPF of 0.09 inches water, similar to the NAM.  This translates into about an inch of snow, assuming colder temperatures.  But surface temperatures may be at or just above freezing for some of the time, reducing accumulations even further.  So a coating to 1 inch of wet snow is still the best guess for PHL and surrounding suburbs, more north and west.

Still a lower than usual confidence forecast, since the higher resolution NAM shows greater QPF values and some of the other models suggest the same.

Whatever falls likely causes icy conditions, as temperatures are expected to drop early Wednesday morning.