The coastal flood advisory that has been in effect for parts of the Chesapeake Bay the last two mornings is a result of the full moon and sustained winds, according to the National Weather Service.
Tides a foot higher than normal are expected, and have already been seen in lower parts of the bay. The U.S. Naval Academy's first high tide was at 7:47 a.m., Fort McHenry's was at 9 a.m. and Havre de Grace's around noon.
High tides are expected again at 7:51 p.m. in Annapolis, 9:26 p.m. at Fort McHenry, 10:18 p.m. at Bowley's Quarters and 12:46 a.m. at Havre de Grace.
The coastal flood advisory is in effect for Anne Arundel, Baltimore and Harford counties and Baltimore city through 1 a.m.
This weekend's supermoon, a normal full moon coinciding with the moon's perigee, was expected to contribute to higher than normal tides. The moon was a mere 221,800 miles away at its closest Saturday night.
Prolonged easterly and southeasterly winds have also held more water in the bay and pushed it toward shorelines, said Nicole Listemaa, a meteorologist with the National Weather Service in Sterling, Va.