The low-pressure system  will be taking a more northerly track, right  across Pennsylvania. More warm air is expected to be brought into the storm changing the initial snow to rain by daybreak Monday and much of the morning will be rain in and around Philadelphia. Windy and very cold conditions will follow  Monday afternoon and evening.

Lastest NAM data supports only 2-3 inches for PHL from this storm.  I’m sticking to my earlier forecast that this storm will fizzle out for PHL.