FZUS51 KLWX 220029 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 829 PM EDT Wed May 21 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. ANZ500-220800- 829 PM EDT Wed May 21 2025 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A strong area of low pressure will move across the region through Thursday, then move offshore at the end of the week. High pressure approaches from the west over the weekend. Small Craft Advisories may be needed at times Thursday through Saturday. $$ ANZ535-220800- Tidal Potomac from Key Bridge to Indian Head- 829 PM EDT Wed May 21 2025 .TONIGHT...E winds 5 to 10 kt...becoming NE late. Waves 1 ft. Showers with a slight chance of tstms early this evening, then a chance of showers after midnight. Patchy fog. .THU...W winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. Showers. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. .SAT...NW winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .SUN...NW winds around 5 kt. Waves 1 ft. A chance of showers through the night. .MON...E winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-220800- Tidal Potomac from Indian Head to Cobb Island- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 10 to 15 kt with gusts to 20 kt... becoming N 5 kt after midnight. Waves 1 to 2 ft. Showers with a slight chance of tstms early this evening, then a chance of showers after midnight. Patchy fog. .THU...W winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft. Showers likely. .THU NIGHT...W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .FRI...W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt. Waves 1 ft. .SAT...NW winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .SUN...NW winds around 5 kt. Waves 1 ft. A chance of showers through the night. .MON...E winds around 5 kt. Waves 1 ft. A chance of showers, then showers likely after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-220800- Tidal Potomac from Cobb Island to Smith Point- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 20 kt with gusts to 25 kt...diminishing to 10 kt after midnight, then becoming NW late. Waves 3 ft...subsiding to 1 ft late. Showers with a slight chance of tstms early this evening, then a chance of showers after midnight. Patchy fog. Vsby 1 to 3 NM after midnight. .THU...W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NW winds 10 to 15 kt...becoming W late. Gusts up to 20 kt. Waves 1 to 2 ft. A chance of showers. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .FRI NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .SAT...NW winds 10 to 15 kt. Waves 1 to 2 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .SUN...N winds 5 kt. Waves less than 1 ft. A chance of showers through the night. .MON...E winds 5 to 10 kt...becoming SE after midnight. Waves 1 ft. A chance of showers, then showers likely after midnight. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-220800- Chesapeake Bay north of Pooles Island- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 15 to 20 kt with gusts to 25 kt... becoming NE 10 kt late. Waves 1 to 2 ft. Showers with a slight chance of tstms. Patchy fog. Vsby 1 to 3 NM. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers. Vsby 1 to 3 NM. .THU NIGHT...NW winds 5 to 10 kt...becoming W after midnight. Waves 1 ft. Showers likely. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .SAT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers after midnight. .MON...NE winds around 5 kt. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-220800- Chesapeake Bay from Pooles Island to Sandy Point- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 20 kt with gusts to 25 kt...diminishing to 10 kt with gusts to 20 kt after midnight. Waves 2 to 3 ft... subsiding to 1 ft late. Showers with a slight chance of tstms. Patchy fog early this evening. Patchy fog after midnight. Vsby 1 to 3 NM early this evening. .THU...NE winds 5 to 10 kt. Waves 1 ft. Showers. Vsby 1 NM or less. .THU NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .FRI NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT...W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves 1 to 2 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers after midnight. .MON...E winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-220800- Patapsco River including Baltimore Harbor- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 10 to 15 kt. Gusts up to 25 kt early this evening. Waves 1 to 2 ft. Showers with a slight chance of tstms. Patchy fog early this evening. Patchy fog after midnight. Vsby 1 to 3 NM early this evening. .THU...N winds 5 to 10 kt. Waves 1 ft. Showers. Vsby 1 NM or less. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...W winds 10 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...W winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .SAT...W winds 10 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 ft or less. .SUN...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. .MON...E winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-220800- Chester River to Queenstown MD- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 15 to 20 kt with gusts to 25 kt... diminishing to 10 kt after midnight. Waves 1 to 2 ft. Showers with a slight chance of tstms. Patchy fog early this evening. Patchy fog after midnight. Vsby 1 to 3 NM early this evening. .THU...N winds 5 to 10 kt. Waves 1 ft. Showers. Vsby 1 NM or less. .THU NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers likely. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .FRI NIGHT...W winds 10 kt with gusts to 20 kt. Waves 2 ft. .SAT...W winds 10 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. .MON...E winds 5 kt. Waves flat. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-220800- Chesapeake Bay from Sandy Point to North Beach- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 20 kt with gusts to 25 kt...diminishing to 10 kt after midnight. Waves 2 to 3 ft...subsiding to 1 ft late. A slight chance of tstms. Showers. Patchy fog. .THU...N winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves 1 ft. Showers. Vsby 1 NM or less. .THU NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .FRI NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 to 2 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. .MON...E winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-220800- Eastern Bay- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 10 to 15 kt. Gusts up to 25 kt. Waves 1 to 2 ft. A slight chance of tstms. Showers. Patchy fog. .THU...N winds 5 to 10 kt. Waves 1 ft. Showers. Vsby 1 NM or less. .THU NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...W winds 10 kt with gusts to 20 kt. Waves 1 ft. .SAT...W winds 10 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft or less. A chance of showers through the night. .MON...E winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-220800- Chesapeake Bay from North Beach to Drum Point- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 20 kt with gusts to 25 kt...becoming NE 5 to 10 kt after midnight. Waves 2 to 3 ft...subsiding to 1 ft late. Showers with a slight chance of tstms early this evening, then a chance of showers with a slight chance of tstms after midnight. Patchy fog early this evening. Patchy fog after midnight. Vsby 1 to 3 NM early this evening. .THU...NW winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 to 2 ft. Showers. Vsby 1 NM or less. .THU NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .FRI NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night. .MON...NE winds 5 to 10 kt...becoming SE. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-220800- Choptank River to Cambridge MD and the Little Choptank River- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 20 kt with gusts to 25 kt...becoming NE 5 to 10 kt after midnight. Waves 1 to 2 ft. A slight chance of tstms. Showers early this evening, then a chance of showers after midnight. Patchy fog. .THU...NW winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft. A chance of showers. Vsby 1 NM or less. .THU NIGHT...W winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .FRI NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 to 2 ft. .SUN...NW winds 5 to 10 kt. Waves 1 ft. A chance of showers through the night. .MON...NE winds 5 kt...becoming SE after midnight. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-220800- Patuxent River to Broomes Island MD- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 15 kt with gusts to 25 kt...becoming NE 5 kt after midnight. Waves 1 ft. A slight chance of tstms. Showers early this evening, then a chance of showers after midnight. Patchy fog. .THU...NW winds 5 to 10 kt. Gusts up to 20 kt in the late morning and afternoon. Waves 1 ft. Showers likely. Vsby 1 NM or less. .THU NIGHT...W winds 5 to 10 kt. Waves 1 ft. A chance of showers. .FRI...W winds 10 kt. Waves 1 ft. .FRI NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .SAT...NW winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...NW winds 5 to 10 kt. Waves 1 ft. .SUN...NW winds 5 kt. Waves less than 1 ft. A chance of showers through the night. .MON...E winds 5 kt. Waves less than 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-220800- Chesapeake Bay from Drum Point to Smith Point- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 20 kt with gusts to 25 kt...diminishing to 10 kt after midnight, then becoming NW late. Waves 3 ft...subsiding to 1 ft late. Showers with a slight chance of tstms early this evening, then a chance of showers after midnight. Patchy fog. .THU...NW winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft. Showers likely. .THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. A chance of showers. .FRI...W winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .FRI NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 10 to 15 kt. Waves 2 ft. .SUN...NW winds 5 to 10 kt...becoming NE after midnight. Waves 1 ft. A chance of showers through the night. .MON...NE winds 5 to 10 kt...becoming SE. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-220800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 829 PM EDT Wed May 21 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL MIDNIGHT EDT TONIGHT... .TONIGHT...E winds 15 to 20 kt with gusts to 30 kt... becoming NW 10 kt late. Waves 1 to 2 ft. Showers likely with a slight chance of tstms early this evening, then a chance of showers after midnight. Patchy fog. Vsby 1 to 3 NM after midnight. .THU...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. Showers likely. .THU NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. A chance of showers. .FRI...W winds 15 to 20 kt. Waves 2 ft. .FRI NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...NW winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SUN...NW winds 5 to 10 kt...becoming NE after midnight. Waves 1 ft. A chance of showers through the night. .MON...NE winds 5 to 10 kt...becoming SE. Waves 1 ft. A chance of showers. Winds and waves higher and visibilities lower in and near tstms. $$