@DCTeacherman...I have been looking at SPC mesoanalyis to see what might have caused this snow band. Best I can see, the 700mb low seemed to extend south and/or reform a bit over the southern tip of the Delmarva. Lift is usually maximized on the N/NW fringe of the 700mb low, which yesterday was over northern NJ/NYC/NE PA. Then there was also wind and moisture convergence around 850mb.
Here's 700mb:
I can't post the -2hr (2 hours ago) map it seems..., but here's the link to the 850mb plot and just click the -4 or -2 button at the top right (time sensitive obviously):
https://www.spc.noaa.gov/exper/mesoanalysis/new/viewsector.php?sector=17#