The slow-moving cool front that is going to take its sweet time to cross the region -- it's going to be a part of our weather through Thursday -- is bringing its first shot of showers to parts of our region later on this evening. Odds favor this round of rain to pass generally to the north/west of Philadelphia -- with the Lehigh Valley, Poconos, and Central Pennsylvania the beneficiaries of showers from the interaction of warmth aloft, a disturbance riding the front, and the boundary itself.
Steadier rains will fall back to our west and northwest -- generally across Western Pennsylvania and into Upstate New York -- but showers will ride northeast to the east of the frontal boundary and impact the I-81 corridor and Lehigh Valley later on tonight -- generally after Midnight into the early morning hours on Tuesday. We can't completely discount the presence of a couple of showers even into Philadelphia late tonight or in the early morning hours on Tuesday -- however, the majority of showers that looks to fall later on tonight should be to our north and west.
In terms of potential accumulations, some parts of the region could see a few inches of snow...mainly higher elevations, with generally anyone north/west of 295 in New Jersey getting a shot at seeing some snow stick on Wednesday night. There's still a lot to look at in the coming runs and it's not a "lock" yet but there's definitely a wintry event to keep an eye on.