Very cold Arctic air is plunging down from Canada across the Midwest and the Northeast tonight through Saturday.  Some moderation is forecast for Sunday but more cold air will move down again for Tuesday. Rain and snow is likely on Wednesday for the New York City metropolitan area. 
George Wright is a Certified Consulting Meteorologist for Wright Weather Consulting, LLC. Visit our website at WrightWeather.com. Follow George Wright on Twitter @gwweather.