For the most part snow doesn’t get a chance to even stick in Manhattan. There is never a second when there isn’t people walking and vehicles moving.
As for snow accumulating in Manhattan, it usually doesn't because of all the heat beneath the streets and sidewalks. But it does accumulate sometimes; and if they are correct about the intensity of this storm, it will accumulate today.
ML/NJ
Yeah, you’ve got plenty of underground heating vents and tunnels melting the sidewalks in Manhattan, too. But if it comes down fast enough it does pile up on the plowed street corners—and then they come and truck it away pretty quickly.
My point really was that in part because of its efficiency NYC doesn’t shut down its schools and existence as quickly as other areas in the region.