Tropical Storm Hanna is expected to dump several inches of rain on the coastal areas of the Carolinas through central Virginia, Maryland and southeastern Pennsylvania.
Forecasters say some spots could see up to ten inches of rain, and there's a potential for flash flooding in the northern mid-Atlantic states and southern New England.
Hanna is expected to make landfall on the northern coast of South Carolina early Saturday.
Tropical storm watches or warnings are in effect from Georgia to Rhode Island, and include all of Chesapeake Bay, the Washington D.C. area and Long Island.
As of 5 p.m. Friday, Hanna had maximum sustained winds near 70 miles per hour and is centered about 240 miles south of Wilmington, North Carolina. It's moving at nearly 20 miles per hour.
Disaster planners also are keeping an eye on Hurricane Ike, which could hit Florida by the middle of next week.