I fight it even around 400' inside the Beltway. Last decent snow in Jan 19, DC more or less jackpotted, which Just Doesn't Happen. So on that basis alone, I am fully expecting a sloppy few inches while the Catoctins and the north Jersey shore do their usual epic nukage dance. It's the way our little corner of the snowiverse works.
The solution would be to displace Sugarloaf Mountain 35 miles or so to the SE, but that might create other problems. Or, thinking real big, get rid of the Bay, Alleghenies, and Blue Ridge, and move DC 100 or so miles upriver. We'd probably still average under 20" a year.