This morning’s NAM data rolling in.  The NAM is beginning to maintain a dry slot area over PHL for this snowfall with the same showing last night.   QPF values have reduced to 0.09 inches for PHL with higher amounts far north and far west.

The snow is minimal before midnight, then the ‘bulk’ of the light snow falls.  With temperatures at or above freezing and a similar QPF as the GFS model from last night, I’m revising the accumulations downward to a coating to 1 inch in Philadelphia and the immediate suburbs, starting late evening and ending early morning Wednesday.