FZUS51 KLWX 240257 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 1057 PM EDT Sun Aug 23 2026 Tidal Potomac River and Maryland portion of Chesapeake Bay. Forecasts of wave heights do not include effects of wind direction relative to tidal currents. Expect higher waves when winds are blowing against the tidal flow. Waves flat where waters are iced over. ANZ500-240800- 1057 PM EDT Sun Aug 23 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... High pressure will gradually build toward the waters from the west early this week, before shifting offshore later this week. Winds may near low-end SCA levels in southerly flow on Wednesday. $$ ANZ535-240800- Tidal Potomac from Key Bridge to Indian Head- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...W winds around 5 kt. Waves 1 ft or less. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...NW winds around 5 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt. Waves 1 ft. .WED NIGHT...S winds 5 kt. Waves less than 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .FRI...W winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-240800- Tidal Potomac from Indian Head to Cobb Island- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...W winds around 5 kt. Waves 1 ft. .MON NIGHT...NW winds around 5 kt. Waves 1 ft. .TUE...NW winds around 5 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft or less. .WED...S winds around 5 kt. Waves 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .FRI...W winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-240800- Tidal Potomac from Cobb Island to Smith Point- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .MON...W winds around 5 kt. Waves 1 ft or less. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 kt. Waves less than 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves flat. .WED...S winds 5 to 10 kt. Waves 1 ft or less. .WED NIGHT...S winds 10 to 15 kt. Waves 2 ft. A chance of showers. .THU...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers. A chance of tstms through the night. .FRI...SW winds around 5 kt. Waves 1 ft or less. A chance of showers through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-240800- Chesapeake Bay north of Pooles Island- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...W winds 5 kt. Waves less than 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 kt. Waves less than 1 ft. .TUE NIGHT...NW winds around 5 kt. Waves 1 ft. .WED...SE winds around 5 kt. Waves 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely with a chance of tstms. .FRI...W winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-240800- Chesapeake Bay from Pooles Island to Sandy Point- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .WED...NE winds 5 kt...becoming S in the afternoon. Waves 1 ft or less. .WED NIGHT...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers. .THU...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers in the morning, then showers likely with a chance of tstms. .FRI...W winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-240800- Patapsco River including Baltimore Harbor- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...W winds 5 kt. Waves flat. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .TUE...W winds 5 kt. Waves less than 1 ft. .TUE NIGHT...NW winds around 5 kt. Waves 1 ft or less. .WED...NE winds around 5 kt...becoming SE in the afternoon. Waves 1 ft or less. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely with a chance of tstms. .FRI...W winds around 5 kt. Waves flat. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-240800- Chester River to Queenstown MD- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 kt. Waves less than 1 ft. .TUE...W winds 5 kt. Waves less than 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...SE winds around 5 kt. Waves 1 ft or less. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely with a chance of tstms. .FRI...SW winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-240800- Chesapeake Bay from Sandy Point to North Beach- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft. .WED...NE winds 5 kt...becoming S in the afternoon. Waves 1 ft or less. .WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU...S winds 10 to 15 kt. Waves 2 ft. A chance of showers in the morning, then showers likely with a chance of tstms. .FRI...SW winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-240800- Eastern Bay- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...W winds 5 kt. Waves less than 1 ft. .TUE NIGHT...W winds around 5 kt. Waves 1 ft or less. .WED...E winds around 5 kt...becoming S in the afternoon. Waves 1 ft or less. .WED NIGHT...S winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely with a chance of tstms. .FRI...SW winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-240800- Chesapeake Bay from North Beach to Drum Point- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft. .WED...W winds around 5 kt...becoming S 10 to 15 kt in the afternoon. Waves 1 ft or less. .WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU...S winds 10 to 15 kt. Waves 1 to 2 ft. Showers likely. A chance of tstms through the night. .FRI...SW winds around 5 kt. Waves 1ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-240800- Choptank River to Cambridge MD and the Little Choptank River- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds around 5 kt. Waves 1 ft. .MON NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft. .WED...E winds around 5 kt...becoming S in the afternoon. Waves 1 ft or less. .WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU...S winds 10 to 15 kt. Waves 1 ft. Showers likely. A chance of tstms through the night. .FRI...SW winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-240800- Patuxent River to Broomes Island MD- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...W winds around 5 kt. Waves 1 ft. .MON NIGHT...NW winds 5 kt. Waves less than 1 ft. .TUE...NW winds 5 kt. Waves less than 1 ft. .TUE NIGHT...SW winds around 5 kt. Waves 1 ft. .WED...S winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...S winds 5 to 10 kt. Waves 1 ft. A chance of showers. .THU...S winds 5 to 10 kt. Waves 1 ft. Showers likely. A chance of tstms through the night. .FRI...SW winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-240800- Chesapeake Bay from Drum Point to Smith Point- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...W winds 5 kt. Waves less than 1 ft. .MON NIGHT...SW winds 5 kt...becoming N in the late evening and overnight. Waves 1 ft. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds 5 kt. Waves less than 1 ft. .WED...SW winds around 5 kt...becoming S 10 to 15 kt in the afternoon. Waves flat...building to 2 ft in the afternoon. .WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft. A chance of showers. .THU...S winds 10 to 15 kt. Waves 2 to 3 ft. A chance of showers. A chance of tstms through the night. .FRI...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-240800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 1057 PM EDT Sun Aug 23 2026 .REST OF TONIGHT...W winds 5 to 10 kt...becoming N late. Waves 1 ft. .MON...W winds around 5 kt. Waves 1 ft or less. .MON NIGHT...NW winds 5 kt...becoming N after midnight. Waves 1 ft or less. .TUE...NW winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...SW winds 5 kt. Waves less than 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft or less. .WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU...S winds 10 to 15 kt. Waves 1 to 2 ft. A chance of showers through the day. Showers likely with a chance of tstms through the night. .FRI...SW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers in the morning. Winds and waves higher and visibilities lower in and near tstms. $$