Coastal Waters Forecast
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
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428 FZUS51 KLWX 200235 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 1035 PM EDT Sat Jul 19 2025 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. ANZ500-200800- 1035 PM EDT Sat Jul 19 2025 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A stalled front moves north across the waters as a warm front today. A stronger cold front moves through the area Sunday night. Daily shower and thunderstorm chances continue through the weekend, with any stronger thunderstorm posing a risk to mariners. Drier conditions return for the start of next week as Canadian high pressure builds to the north. Small Craft Advisories may be needed Sunday evening into Monday morning. $$ ANZ535-200800- Tidal Potomac from Key Bridge to Indian Head- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...Light winds. Waves flat. Isolated showers and tstms late this evening. .SUN...W winds around 5 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...N winds 5 kt. Waves less than 1 ft. .MON NIGHT...NE winds around 5 kt. Waves 1 ft. .TUE...NE winds 5 kt. Waves less than 1 ft. .TUE NIGHT...E winds around 5 kt. Waves 1 ft. .WED...SE winds around 5 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-200800- Tidal Potomac from Indian Head to Cobb Island- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves less than 1 ft. Isolated showers and tstms late this evening with vsby 1 NM or less. .SUN...W winds around 5 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 kt. Waves less than 1 ft. .MON...N winds 5 kt. Waves less than 1 ft. .MON NIGHT...NE winds around 5 kt. Waves 1 ft. .TUE...NE winds 5 kt. Waves less than 1 ft. .TUE NIGHT...E winds around 5 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt...becoming S after midnight. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-200800- Tidal Potomac from Cobb Island to Smith Point- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves flat. Scattered showers and tstms late this evening, then isolated showers. Vsby 1 NM or less late this evening. .SUN...W winds 5 kt. Waves less than 1 ft. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-200800- Chesapeake Bay north of Pooles Island- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...S winds 5 kt. Waves less than 1 ft. A slight chance of showers with isolated tstms. Patchy fog. Vsby 1 NM or less. .SUN...W winds 5 to 10 kt. Waves 1 ft. Patchy fog. Vsby 1 to 3 NM. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds around 5 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-200800- Chesapeake Bay from Pooles Island to Sandy Point- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves flat. Isolated tstms. Isolated showers. Vsby 1 NM or less. .SUN...W winds 5 to 10 kt. Waves 1 ft or less. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 kt. Waves less than 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-200800- Patapsco River including Baltimore Harbor- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...Light winds. Waves flat. A slight chance of showers with isolated tstms. Vsby 1 NM or less late this evening. .SUN...W winds around 5 kt. Waves 1 ft or less. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...N winds 5 kt. Waves less than 1 ft. .TUE...NE winds 5 kt. Waves less than 1 ft. .TUE NIGHT...E winds around 5 kt. Waves flat. .WED...SE winds 5 to 10 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-200800- Chester River to Queenstown MD- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves flat. Isolated tstms. Scattered showers. Vsby 1 NM or less. .SUN...W winds 5 kt. Waves less than 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 kt. Waves flat. .WED...SE winds 5 to 10 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-200800- Chesapeake Bay from Sandy Point to North Beach- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves less than 1 ft. Isolated tstms. Isolated showers. Vsby 1 NM or less. .SUN...W winds 5 kt. Waves less than 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 kt. Waves less than 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 to 2 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-200800- Eastern Bay- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves flat. Scattered showers and tstms. .SUN...W winds 5 kt. Waves less than 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 kt. Waves flat. .WED...SE winds 5 to 10 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-200800- Chesapeake Bay from North Beach to Drum Point- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves less than 1 ft. Scattered showers and tstms late this evening, then a slight chance of showers with isolated tstms. Vsby 1 NM or less. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 to 2 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 to 2 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-200800- Choptank River to Cambridge MD and the Little Choptank River- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves flat. Scattered showers and tstms. Vsby 1 NM or less...increasing to 1 to 3 NM. .SUN...W winds 5 kt. Waves less than 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 kt. Waves less than 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft or less. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-200800- Patuxent River to Broomes Island MD- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves less than 1 ft. Scattered showers and tstms late this evening, then isolated showers and tstms. Vsby 1 NM or less late this evening. .SUN...W winds around 5 kt. Waves 1 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .MON...N winds 5 to 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 kt. Waves less than 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds around 5 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-200800- Chesapeake Bay from Drum Point to Smith Point- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves less than 1 ft. Scattered showers and tstms late this evening, then a slight chance of showers with isolated tstms. Vsby 1 NM or less late this evening. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 to 2 ft. .MON...N winds 10 kt. Waves 2 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 to 2 ft. .THU...S winds 10 to 15 kt...becoming SW after midnight. Waves 1 to 2 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-200800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 1035 PM EDT Sat Jul 19 2025 .REST OF TONIGHT...SW winds 5 kt. Waves less than 1 ft. Scattered showers and tstms. Vsby 1 NM or less late this evening. .SUN...W winds 5 to 10 kt. Waves 1 ft. .SUN NIGHT...W winds 5 to 10 kt. Waves 1 ft. .MON...N winds 10 kt. Waves 1 ft. .MON NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...SE winds 5 to 10 kt. Waves 1 ft. .THU...S winds 10 to 15 kt...becoming SW after midnight. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$