As I mentioned last night, the NAM model showed a  westward extent of the snow for Saturday from the coastal low.

Today’s NAM has continued with that trend, with a rapid decrease in QPF values west and north of PHL.   Areas in New Jersey will have significantly more snow.

Currently, the QPF for Philadelphia Airport is 0.25 inches water which translates into 3 inches of snow.  Areas such as Blue Bell, have a lower QPF, closer to 0.18 inches water.

The GFS has joined in with that westward extent of the precipitation shield.

The NAM data for tonight’s run becomes available about 9:40 PM and I’ll update after that time.

Additional info: the snow coverage and amounts with Saturday’s storm is unusually low confidence, especially here in Philadelphia.  Slight differences in the low pressure’s intensification or track will greatly affect the snowfall amounts.