Via Tonight: With sunset, prepare on popular iciness starting to be extra of a difficulty. Any untreated surfaces will be difficult to traverse, and patchy iciness is possible even on formerly addressed spots. Supplied apparent skies, gentle winds and a fresh new snowpack, temperatures are established to slide with simplicity. It is the coldest night in rather some time, with lows approaching 10 levels in the normal cold places to maybe the upper teens in the city. D.C. did not fall beneath 22 possibly of the past two winters, a streak established to end shortly.