Mr. Bloomberg said at a news briefing.New York was a city of apocalyptic silence in the morning. The choreography of traffic, commuter trains and pedestrian hordes was missing. In its place, a plow scraped by now and then and a car or two churned past on deserted thoroughfares. Cabs were a myth. Side streets were impassable, and people muffled to the eyes slogged over huge drifts and mountains of curbside snow, trying to keep their footing.By late morning, the sun broke through and the skies cleared to pristine blue.