Clipper System (tonight through Monday afternoon):
A mix of rain and snow will develop late this evening across northern Maryland, changing over to heavy snow during the overnight hours. Roads will become snow-covered making for difficult travel conditions.
A mix of rain and snow will develop across northern Virginia, DC, and central Maryland between 4 and 8 AM. The rain/snow mix should transition over to snow as the falling precipitation pulls down colder air aloft. Temperatures may be slower to fall below freezing from DC points south and east on Monday morning, preventing snow from accumulating until the afternoon/evening hours.
Nor’easter (Overnight Monday through Tuesday):
A Nor’easter will track close enough to the coast on Monday night to produce scattered snow squalls across the eastern half of the DC Region. During this time frame temperatures will be cold enough for every flake to stick. Some of these snow bands could easily drop one inch of snow per hour Monday night into Tuesday. For this reason, a Winter Storm Watch remains in effect for the counties in Maryland along the western shore of the Chesapeake Bay. An additional one to three inches of snow could fall Monday night across the DC Area with higher amounts (3″ +) possible to the east.