As of the noon hour, it is snowing from Harrisburg, PA to Winchester, VA and the precipitation is progressing steadily to the east. Rain and/or snow should begin in the early-to-mid afternoon hours across the DC metro region, but the late afternoon and early evening should feature all snow at varying intensities. Temperatures will drop from the upper 30’s once the precipitation begins towards the freezing mark by the evening rush hour and there can be some slippery spots; especially, in the northern and western suburbs. The snow continues into the evening hours before winding down by midnight, but slippery spots may continue on untreated surfaces even after the snow ends as temperatures drop to well below freezing. Snow accumulations by late this evening should range from a coating to an inch or so from the District and points to the S and E and up to 2 inches or so in the northern and western suburbs. As far as the weekend goes, a cold blast invades the region on Saturday and some snow is likely to accompany that intrusion of Arctic air.