We get even colder tonight, with some parts of the area under a frost advisory. Temperatures will fall off rather quickly, with lows in the mid-30s in Loudoun, Fairfax and Prince William counties, which is why these locations are under a frost advisory. But I would not be surprised if these locations eventually ended up under a frost advisory, as well. Mostly clear with calming winds tomorrow night. Low temperatures will range from the upper 30s to low 40s.

Source: Washington Post April 29, 2018 20:50 UTC