Mostly as forecast, Sunday morning's snowfall was confined mostly to Southern Maryland, with some additional accumulations reported from the Lower Eastern Shore. BWI-Marshall Airport reported light snow from the 3 a.m. hour through the 7 a.m. hour. But forecasters at Sterling say it was melting as it landed, and will be reported as only a "trace."
The Winter Weather Advisories for Southern Maryland were lifted around 10 a.m.
Here's the National Weather Service's updated forecast map through 6 p.m. Sunday. Click to enlarge. This version makes it pretty clear where colder, drier air moving down from the north or northeast prevented enough southern moisture from getting in to produce snow.