Snow is made with a relatively simple recipe. All it takes is water vapor, cloud condensation nuclei, and an uplift mechanism. This week, the Eastern seaboard has had all the ingredients. Cloud condensation nuclei are almost always bopping around, looking to help water vapor condensate and form a liquid. And there's been a lot of water vapor in the air as a wet, warm storm has been pushing up from the Atlantic for days. But instead of warming the coast, that sea breeze has bumped right into a front of cold air coming down from the Arctic. As the two fronts collide, the warm air is forced on top of the cold air, granting the gales the uplift mechanism they need to become a full blown snowstorm. So long as dueling squalls continue their frigid tango, meteorologists predict everywhere from Maine to Florida can expect the chilly conditions to continue.