Just finished the run up I-270. Started as rain/snow mix in Bethesda, but changed to all snow north of Rockville as far as I could tell. Intensity varied a lot, heaviest snow at the time was between Germantown and Clarksburg. Probably the highest accumulation so far was around Hyattstown/MD 109/MD 75, but still just a half and inch or so by my eyes. Temps dropped quickly heading northwest. Traffic was very heavy but no issues with the roads of course.