The 1 AM runs of the models (06 Z)  show some differences with the earlier evening runs regarding the snow for Friday.  The GFS has much less wrap-around moisture than the NAM.  This run of the NAM delays the changeover to later in the morning or earlier afternoon.

That said, wind-driven rain will change over to wet snow by afternoon, even in Philadelphia.  However, falling snow does NOT necessarily translate into accumulating snow.  Ground temperatures  will be above freezing, as will surface air temperatures.   Solar insolation through clouds is high in March, further reducing the chance of accumulations on roadways and dark surfaces.

So a slushy accumulation at most on roads expected.   The NAM has light snow into the evening, where some roadways and sidewalks may get some accumulation, if this really occurs.

Won’t attempt actual accumulation totals with this storm- meaningless in this scenario at the current time.