FZUS51 KLWX 192210 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 610 PM EDT Tue May 19 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. ANZ500-200800- 610 PM EDT Tue May 19 2026 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... Winds subside late tonight. Additional Small Craft Advisories may be needed through Thursday as a cold front crosses the waters. The front will bring scattered to numerous showers and thunderstorms Wednesday afternoon and evening. Special Marine Warnings may be needed for stronger thunderstorms during this time. No marine hazards are expected Thursday with Small Craft conditions returning Friday into the weekend. $$ ANZ535-200800- Tidal Potomac from Key Bridge to Indian Head- 610 PM EDT Tue May 19 2026 .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. Showers and scattered tstms this evening. .WED...W winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 kt. Waves 1 ft. Showers. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers. .FRI NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers, mainly in the morning. .SUN...E winds around 5 kt. Waves 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-200800- Tidal Potomac from Indian Head to Cobb Island- 610 PM EDT Tue May 19 2026 .TONIGHT...S winds 10 kt. Waves 1 ft. Scattered showers this evening. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 5 to 10 kt. Waves 1 ft. A chance of showers. .THU NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 kt. Waves 1 ft. Showers likely. .FRI NIGHT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .SAT...NE winds 5 kt. Waves less than 1 ft. Showers likely. .SUN...E winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-200800- Tidal Potomac from Cobb Island to Smith Point- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. A chance of showers and tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .SUN...E winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-200800- Chesapeake Bay north of Pooles Island- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...SW winds 5 to 10 kt. Waves 1 ft. .WED...W winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .FRI NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers through the day, then showers likely through the night. .SUN...E winds around 5 kt. Waves 1 ft. A chance of showers through the day. Showers likely through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-200800- Chesapeake Bay from Pooles Island to Sandy Point- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 5 to 10 kt. Waves 1 to 2 ft. Numerous showers and scattered tstms this evening. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SUN...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-200800- Patapsco River including Baltimore Harbor- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 to 15 kt...becoming SW 5 kt after midnight. Waves 1 ft or less. Numerous showers and scattered tstms this evening. .WED...W winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .THU NIGHT...E winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SUN...E winds around 5 kt. Waves 1 ft or less. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-200800- Chester River to Queenstown MD- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 kt. Waves 1 ft. Scattered showers with isolated tstms this evening. .WED...SW winds 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...E winds 10 kt. Waves 1 ft. A chance of showers. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SUN...E winds 5 kt. Waves less than 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-200800- Chesapeake Bay from Sandy Point to North Beach- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Scattered showers with isolated tstms this evening. .WED...SW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NE winds 10 kt. Waves 1 to 2 ft. Showers likely. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SUN...E winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-200800- Eastern Bay- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 kt. Waves 1 ft. Scattered showers this evening. .WED...SW winds 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NE winds 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers. .SUN...E winds 5 kt. Waves less than 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-200800- Chesapeake Bay from North Beach to Drum Point- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 to 15 kt. Waves 1 to 2 ft. Scattered showers this evening. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .SUN...E winds 5 to 10 kt. Waves 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-200800- Choptank River to Cambridge MD and the Little Choptank River- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 to 15 kt. Waves 1 to 2 ft. Scattered showers this evening. .WED...SW winds 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...NW winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .SUN...E winds 5 kt. Waves less than 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-200800- Patuxent River to Broomes Island MD- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... .TONIGHT...S winds 10 kt. Waves 1 ft. .WED...SW winds 5 to 10 kt. Waves 1 ft. A chance of showers. .WED NIGHT...N winds 5 to 10 kt. Waves 1 ft. Showers likely with a chance of tstms. .THU...NE winds 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .THU NIGHT...NE winds 10 kt. Waves 1 ft. Showers likely. .FRI...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI NIGHT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. .SAT...NE winds 5 to 10 kt. Waves 1 ft. Showers likely. .SUN...E winds 5 kt. Waves less than 1 ft. A chance of showers in the morning, then showers likely through the night. A chance of showers after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-200800- Chesapeake Bay from Drum Point to Smith Point- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING... .TONIGHT...S winds 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .WED...SW winds 10 to 15 kt...becoming S late. Gusts up to 20 kt. Waves 2 ft. .WED NIGHT...SE winds 10 to 15 kt with gusts to 20 kt...becoming N 5 to 10 kt in the late evening and overnight. Waves 1 to 2 ft. A chance of showers. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 3 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI...E winds 15 kt with gusts to 25 kt. Waves 3 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. A chance of tstms through the night. .SUN...E winds 5 to 10 kt...becoming S after midnight. Waves 1 ft. Showers likely in the morning, then a chance of showers in the afternoon. Showers likely through the night. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-200800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 610 PM EDT Tue May 19 2026 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 2 AM EDT WEDNESDAY... ...SMALL CRAFT ADVISORY IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING... .TONIGHT...S winds 15 kt with gusts to 20 kt. Waves 2 ft. .WED...S winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .WED NIGHT...S winds 10 to 15 kt with gusts to 20 kt...becoming N 5 to 10 kt in the late evening and overnight. Waves 1 to 2 ft. A chance of showers. .THU...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .FRI...E winds 15 kt with gusts to 25 kt. Waves 2 ft. Showers likely. .FRI NIGHT...E winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. Showers likely. .SAT...E winds 5 to 10 kt. Waves 1 ft. Showers likely. A chance of tstms through the night. .SUN...E winds 5 to 10 kt...becoming S after midnight. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$