The storm is not only going to bring heavy rain and snow, it will be high winds to East Coast cities. Gusts to nearly 50 mph may occur in NYC which will also slow air travel.
Here is the National Weather Service's overview as of now:
This is the forecast for 5pm EST today:
Here is AccuWeather's overview for tomorrow, the biggest travel day of the year:
7am Wednesday, the deep reed is heavy snow. Thunderstorms are forecast near New York and Boston along with high winds. Showers at Washington and Philadelphia with gusty winds.
And, here is the 4pm Wednesday weather forecast. Conditions at Boston's Logan will still be a windy, rainy mess. Showers and high winds still occurring in NYC.
Here is AccuWeather's Snowfall Forecast: