The wave expected to form Monday into Tuesday has developed earlier and is currently moving up the coast,  brushing our southern region with light snow.  The GFS still keeps this away from Philadelphia, but the modeling of this wave of low pressure has been anything but accurate.   I had mentioned that the model trends were closer to the coast, but this wave has formed earlier and much more westward.

The latest NAM has 0.07 inches water  (QPF) falling as light snow at PHL airport this afternoon.   This could be an inch of snow if it verifies.  This needs to be watched, since this wave of low pressure was not captured by the models even yesterday to hit us.