After an early spring, a late season Nor'easter moved up the East Coast today through Monday bringing torrential rain, strong winds, high waves and snow.
Parts of 10 states are under flood watch advisories from New Hampshire and southern Vermont and Massachusetts, south to New Jersey, Delaware and eastern Pennsylvania. Big cities under flood watches through early Monday include Boston, Hartford, New York City, Philadelphia, and Wilmington, Del., which may see two to four inches of rain.
Areas further inland, from western New York and western Pennsylvania down into West Virginia and Maryland, could see winds from 20 to 40 miles per hour and major snow fall.
In high mountain areas like northwest Pennsylvania's Allegheny Mountains, snowfall could exceed a foot. Counties in and around Pittsburgh could see 3-4 inches of snow.
The worst of the storm is expected to hit late today and continue into Monday.
Accuweather meteorologist Bernie Rayno said the storm will reach its peak tonight into early Monday morning.
"Well, the storm that's coming up the coast Sunday night into Monday will have everything associated with it, from heavy rain and strong winds along the coast to heavy wet snow on the western side of the storm," Rayno said.
ABC News Meteorologist Max Golembo contributed to this report.