Coastal Waters Forecast
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
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234 FZUS51 KLWX 180834 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 434 AM EDT Mon Aug 18 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. ANZ500-182300- 434 AM EDT Mon Aug 18 2025 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A cold front will slowly push south of the area early this morning. This frontal zone will stall off to the south near the Virginia/North Carolina border through the middle of the week. By Thursday, eventually this system pulls away farther to the south and east as a cold front. Weak high pressure returns by late in the week. Small Craft Advisory conditions may linger into Tuesday for portions of the waters. As Hurricane Erin passes well to the east, Small Craft Advisories may be needed late Wednesday into Thursday. Please see National Hurricane Center products for the latest information on Erin. $$ ANZ535-182300- Tidal Potomac from Key Bridge to Indian Head- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF THE OVERNIGHT...NW winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. .TUE NIGHT...E winds 5 kt. Waves less than 1 ft. .WED...E winds 5 kt. Waves less than 1 ft. .WED NIGHT...NE winds 5 kt. Waves less than 1 ft. .THU...N winds 5 to 10 kt. Waves 1 ft. .FRI...SE winds 5 kt. Waves less than 1 ft. $$ ANZ536-182300- Tidal Potomac from Indian Head to Cobb Island- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF THE OVERNIGHT...NW winds 5 kt. Waves less than 1 ft. .TODAY...N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Vsby 1 to 3 NM. .TUE...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. Patchy fog. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .THU...N winds 5 to 10 kt. Waves 1 ft. .FRI...NE winds 5 to 10 kt...becoming SE. Waves 1 ft. $$ ANZ537-182300- Tidal Potomac from Cobb Island to Smith Point- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM NOON EDT TODAY THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...NW winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. A chance of showers. Patchy fog. Vsby 1 NM or less. .TUE...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .TUE NIGHT...E winds 5 to 10 kt. Waves 2 ft. .WED...NE winds 5 to 10 kt. Waves 1 to 2 ft. .WED NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU...NE winds 10 to 15 kt. Waves 2 to 3 ft. .FRI...NE winds 5 to 10 kt...becoming S. Waves 1 to 2 ft. $$ ANZ530-182300- Chesapeake Bay north of Pooles Island- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...N winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TONIGHT...E winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .TUE...E winds 5 to 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...E winds 5 to 10 kt. Waves 1 ft. .THU...NE winds 5 to 10 kt. Waves 1 to 2 ft. .FRI...NE winds 5 to 10 kt...becoming SE. Waves 1 ft. $$ ANZ531-182300- Chesapeake Bay from Pooles Island to Sandy Point- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...N winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TUE...E winds 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...E winds 10 kt. Waves 1 ft. .THU...NE winds 10 to 15 kt. Waves 2 ft. .FRI...E winds 5 to 10 kt...becoming S. Waves 1 ft. $$ ANZ538-182300- Patapsco River including Baltimore Harbor- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF THE OVERNIGHT...N winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .TONIGHT...NE winds 5 to 10 kt. Waves 1 ft. .TUE...E winds 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...E winds 5 to 10 kt. Waves 1 ft. .THU...NE winds 5 to 10 kt. Waves 1 ft. .FRI...E winds 5 to 10 kt...becoming S. Waves 1 ft. $$ ANZ539-182300- Chester River to Queenstown MD- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...N winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .TONIGHT...NE winds 10 kt. Waves 1 ft. .TUE...E winds 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...E winds 5 to 10 kt. Waves 1 ft. .THU...NE winds 10 to 15 kt. Waves 1 ft. .FRI...E winds 5 to 10 kt...becoming S. Waves 1 ft. $$ ANZ532-182300- Chesapeake Bay from Sandy Point to North Beach- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...NW winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Patchy fog. Vsby 1 to 3 NM. .TUE...E winds 10 to 15 kt. Waves 1 to 2 ft. Patchy fog. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .THU...NE winds 10 to 15 kt. Waves 2 ft. .FRI...NE winds 5 to 10 kt...becoming S. Waves 1 to 2 ft. $$ ANZ540-182300- Eastern Bay- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...NW winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .TUE...E winds 10 kt. Waves 1 ft. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...NE winds 10 to 15 kt. Waves 1 ft. .THU...NE winds 10 to 15 kt. Waves 1 ft. .FRI...NE winds 5 to 10 kt...becoming SE. Waves 1 ft. $$ ANZ533-182300- Chesapeake Bay from North Beach to Drum Point- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...NW winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. A chance of showers. Patchy fog. Vsby 1 to 3 NM. .TUE...E winds 10 to 15 kt. Waves 2 ft. A chance of showers. Patchy fog. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .THU...NE winds 10 to 15 kt. Waves 2 to 3 ft. .FRI...NE winds 5 to 10 kt...becoming S. Waves 1 to 2 ft. $$ ANZ541-182300- Choptank River to Cambridge MD and the Little Choptank River- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...NW winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. Patchy fog. Vsby 1 to 3 NM. .TUE...E winds 10 to 15 kt. Waves 1 ft. A chance of showers. Patchy fog. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .THU...NE winds 10 to 15 kt. Waves 2 ft. .FRI...NE winds 5 to 10 kt...becoming SE. Waves 1 to 2 ft. $$ ANZ542-182300- Patuxent River to Broomes Island MD- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF THE OVERNIGHT...NW winds 5 kt. Waves less than 1 ft. .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt. Waves 1 ft. A chance of showers. .TONIGHT...NE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. Patchy fog. Vsby 1 to 3 NM. .TUE...E winds 10 kt. Waves 1 ft. A chance of showers. .TUE NIGHT...E winds 5 to 10 kt. Waves 1 ft. .WED...E winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...NE winds 10 kt with gusts to 20 kt. Waves 1 ft. .THU...NE winds 10 to 15 kt. Waves 1 ft. .FRI...NE winds 5 to 10 kt...becoming S. Waves 1 ft. $$ ANZ534-182300- Chesapeake Bay from Drum Point to Smith Point- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM NOON EDT TODAY THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...NW winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft. A chance of showers. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. A chance of showers. Patchy fog. Vsby 1 NM or less. .TUE...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .TUE NIGHT...E winds 10 to 15 kt. Waves 2 ft. .WED...E winds 10 kt. Waves 1 to 2 ft. .WED NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft. .THU...NE winds 15 to 20 kt. Waves 3 ft. .FRI...NE winds 10 to 15 kt...becoming SE 5 to 10 kt. Waves 2 to 3 ft. $$ ANZ543-182300- Tangier Sound and the inland waters surrounding Bloodsworth Island- 434 AM EDT Mon Aug 18 2025 ...SMALL CRAFT ADVISORY IN EFFECT FROM NOON EDT TODAY THROUGH LATE TONIGHT... .REST OF THE OVERNIGHT...W winds 10 kt. Waves 1 ft. .TODAY...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. Patchy fog. Vsby 1 NM or less. .TUE...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .TUE NIGHT...E winds 10 to 15 kt. Waves 1 ft. .WED...E winds 10 to 15 kt. Waves 1 ft. .WED NIGHT...NE winds 15 to 20 kt. Waves 2 ft. .THU...NE winds 15 to 20 kt. Waves 2 ft. .FRI...NE winds 10 to 15 kt...becoming SE 5 to 10 kt. Waves 1 to 2 ft. $$