(1/4) For snow-lovers in south-central PA, tomorrow's storm isn't it. There are just too many things "wrong" with the setup. First, surface temps tomorrow afternoon are going to be in the mid 30s N/W of I-81 to low 40s along the MD Line.. too high for much if any snow to stick..
(2/4) Next, a rain/snow mix will overspread the Lower Susquehanna Valley from southwest-to-northeast between ~7-11 AM before changing over to rain from south-to-north after midday. Here's the problem: precip prior to midday should generally be on the light side..
(3/4) Any AM light snow will struggle to overcome the strong March sun and high ground temps, making accumulation difficult if not impossible. Finally, the upper-level low (ULL) will track just to our north, and colder air/steadier precip are found north/east of a ULL's center..
(4/4) To sum it up, roadways will just be wet tomorrow.. great news for motorists! Areas S/E of I-76/Rt 15 will struggle to receive a coating of snow on non-paved surfaces, & 1-2" amounts farther N/W should be confined to higher terrain above 750 ft. Even that isn't a guarantee..