The National Weather Service in Sterling has extended the tropical storm watch to cover much of the immediate D.C. metro region but it does not include the far western suburbs of Frederick, Loudoun and Fauquier counties.
A tropical storm watch means tropical storm conditions are possible within the watch area generally within 48 hours.
Further east, southeast and northeast, a hurricane watch has been issued from the Virginia/North Carolina border northward to Sandy Hook New Jersey, including Delaware Bay, and the Chesapeake Bay south of Smith point.
A hurricane watch means hurricane conditions are possible within the watch area generally within 48 hours.
OVERVIEW OF WHAT TO EXPECT LOCALLY: Hurricane Irene to sock beaches, sweep D.C. metro region