Washington has 2,600 snow-shoveling volunteers.
Up to 50 million people could be affected by what meteorologist Nick Gregory calls a "classic nor'easter."
The 735-foot cargo ship was en route to San Juan, Puerto Rico, from Jacksonville, Florida.
The storm is expected to head toward the U.S. East Coast over the weekend.
East Coast travelers may see their Thanksgiving plans threatened by the bad weather coming Wednesday.