5:30 pm Update: This afternoon's model runs confirm the earlier trend away from late Sunday/early Monday precipitation, although it can't be completely ruled out.
The computer models have continued to disagree overnight over the prospects of snow Sunday night/Monday morning, but each of the major U.S. models has remained consistent with its own previous snow vs. no-snow forecasts. The lack of consistency between models at the 36-hour range weakens the pro-precipitation case, however, so the chances of a wintry event are diminishing. The main effect on the Inauguration of such an event would be to reduce temperatures on Tuesday, increasing the likelihood that readings would remain below freezing.
Happy New Year!
3 weeks ago