* WHAT. Up to one half foot of inundation above ground level possible in low lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. From 2 AM EDT Friday through Friday morning, especially around the time of high tide. * IMPACTS. At 2.8 feet, flooding of some of the parking area near Dock Street in Annapolis may occur, with water surrounding the Alex Haley Memorial. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The affected high tide at Annapolis U.S. Naval Academy will be at 7:42 AM.

* WHAT. Up to one foot of inundation above ground level expected in low lying areas due to tidal flooding. * WHERE. Shoreline in the District of Columbia. * WHEN. From 8 AM to 1 PM EDT Friday, especially around the time of high tide. * IMPACTS. Shoreline inundation is expected along portions of the seawall adjacent to Ohio Drive and the Hains Point Loop Road, and near the Tidal Basin and Jefferson Memorial. * ADDITIONAL DETAILS. Tides one to one and a half feet above normal. The next high tides at Washington Channel are at 10:15 PM and 10:13 AM.

* WHAT. Up to one foot of inundation above ground level expected in low lying areas due to tidal flooding. * WHERE. Shoreline in Anne Arundel County. * WHEN. From 2 AM to noon EDT Friday, especially around the time of high tide. * IMPACTS. At 3.2 feet, water begins to approach businesses on Dock Street in Annapolis. The City Dock parking lot is flooded. Compromise Street is flooded. * ADDITIONAL DETAILS. Tides one and a half to two feet above normal. The next high tide at Annapolis U.S. Naval Academy is at 7:42 AM.

A period of gusty easterly winds is possible this evening. Gusts of 15 to 20 knots are possible. Mariners, especially those who are inexperienced or operating smaller vessels, should exercise extra caution if navigating the waters during this time.

* WHAT. Temperatures around 34 to 37 degrees will result in frost formation. * WHERE. Carroll, Cecil, Northern Baltimore, Northwest Harford, and Southeast Harford Counties. * WHEN. From 2 AM to 8 AM EDT Friday. * IMPACTS. Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.