No, they're not filming Dante's Peak 2: Return to Dante's Peak. That is actual snow falling from the sky. As in all natural disasters, we turn to El Bloombito for guidance: "Yo will plow los snow en Brooklyn, El Bronxico, Queeños, y Manhattando. Yo feel like I'm forgettingo somethingador."
The snow is supposed to continue until late tonight, and the wind advisory is in effect until 6 a.m. So unless you have a totally KILLER Halloween costume, why risk it? Nights like these are what raw cookie dough and Lifetime movies are made for.