A quick update.  Too early to really call this but the latest GFS model has (at least) 12-15 inches of snow starting some time after noon Friday and lasting into Saturday night. Expect changes with this forecast.

Tues 7 PM update:  Snow starts between noon and  5 PM Friday.   Looks more like only snow and less chance of a mix for Philadelphia and north and west.  It may end earlier- early Saturday evening instead of lingering.   That’s the current picture.