National Weather Service United States Department of Commerce

Here's a snowfall map of reports we received at the NWS for the storm of the 8th of Dec, 2013. 

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The tight gradient along the Mason-Dixon Line was due to a very intense west-to-east band of snow which set up during the morning and early afternoon, producing 1-2" per hour rates.  Those rates are quite unusual.  As a note, the 7.5 inch report in West York is highly suspect, though, as a meteorologist from West York also sent a report of less than 5 inches.

snow map from public and spotter reports for 8Dec2013