I can explain the 2.5 inches by the airport and nothing in the city Sunday evening. With the system on Sunday evening, there was a band of moderate snow that was able to accumulate 1 to 2 inches in areas of far western Allegheny County and to the west of that because it basically held stationary over the same areas. By the time the banding finally shifted east towards the city around midnight, the best dynamics were over, so what snow did fall here had a much harder time accumulating, because it wasn't as heavy and the temps were marginal.