Snow will break out across the Washington Region on Saturday morning from southwest to northeast. The snow will become moderate during the afternoon and evening hours before mixing with and changing to sleet and Freezing Rain.
Latest Snowfall Forecasts (Various Models):
The criteria for a Winter Storm Watch in the Washington Area is either the potential for 5 or more inches of snow OR 1/4″ of ice accretion.
Winter Storm Watches will likely be issued for portions of the DC Area tonight or Friday morning as locations just north and west of the Capital Beltway may receive several inches of snow with ice accumulation on top before a change over to rain pre-dawn on Sunday.
DC Storms 
I wonder what the chances are the Rain/Snow line stays further south? Or will there be a change from rain back to snow? The evening temp looks to be around 29/30’s