After a fairly prolonged period of moderate to heavy snow this morning, all precipitation has ceased around the region, and we will be left with mostly cloudy conditions over night. I have to admit, however, the snow was a nice little treat (at least for those of us not traveling on the highway).

By the time you wake up tomorrow morning, temperatures will have slipped into the mid 30s and skies will have begun clearing from west to east.

Massive Cool Down:
While the temperatures over the next two or three days will by and large be above average, a massive arctic intrusion (likely the most intense of the winter season) will make a move on the region Sunday and Monday, as a large dome of high pressure slides southeastward from the Canadian Provinces. I think GFS forecast high temperatures Monday through Wednesday are too low given the strength and position of this incoming polar vortex-which is basically a region of excessively below normal atmospheric heights, and below normal temperatures.

I can see highs on Tuesday struggling to break the freezing mark in most locations, especially north and west of the District as cold, -15 to -20C air around 1500 feet up slides overhead.