Coastal Flood Advisory issued August 18 at 2:21AM EDT until August 18 at 7:00AM EDT by NWS

...COASTAL FLOOD ADVISORY REMAINS IN EFFECT UNTIL 7 AM EDT THIS MORNING... * LOCATION...DISTRICT OF COLUMBIA. * TIDAL DEPARTURE...AROUND 1 FOOT ABOVE NORMAL. * TIMING...AROUND THE TIME OF HIGH TIDE EARLY THIS MORNING, WHICH WILL OCCUR AT 5:14 AM AT WASHINGTON CHANNEL.

from Current Watches, Warnings and Advisories for the United States Issued by the National Weather Service http://ift.tt/2w88JIE