Image above (tropicaltibits.com): North American Model showing cold front blasting through the DC Region with rain showers and some scattered snow flurries possible in the higher elevations and across northeastern Maryland. 

Image above (tropicaltidbits.com):  Temperatures drop close to 40 degrees between now and Sunday morning!

Image above (tropicaltidbits.com): Potential Snowfall Accumulation through 7pm Monday