Coastal Waters Forecast
Issued by NWS Sterling, VA
Issued by NWS Sterling, VA
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712 FZUS51 KLWX 312037 CWFLWX Coastal Waters Forecast National Weather Service Baltimore MD/Washington DC 437 PM EDT Thu Jul 31 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. ANZ500-010800- 437 PM EDT Thu Jul 31 2025 .SYNOPSIS FOR THE TIDAL POTOMAC AND MD PORTION OF THE CHESAPEAKE BAY... A strong cold front slowly crosses the waters through tonight. High pressure will build to the north through the weekend. $$ ANZ535-010800- Tidal Potomac from Key Bridge to Indian Head- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH FRIDAY EVENING... .REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft. Showers and tstms likely. Vsby 1 NM or less. .TONIGHT...E winds 5 kt...becoming N after midnight. Waves 1 ft. Showers and tstms likely. Vsby 1 NM or less. .FRI...N winds 10 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .SAT...NE winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...NE winds around 5 kt. Waves 1 ft. .SUN...E winds around 5 kt. Waves 1 ft or less. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ536-010800- Tidal Potomac from Indian Head to Cobb Island- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY MORNING... .REST OF THIS AFTERNOON...S winds 5 kt. Waves less than 1 ft. Showers and tstms likely. Vsby 1 NM or less. .TONIGHT...SE winds 5 to 10 kt...becoming N in the late evening and overnight. Waves 1 ft. Showers and tstms likely. Vsby 1 NM or less. .FRI...N winds 10 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...NE winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .SAT...NE winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...NE winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ537-010800- Tidal Potomac from Cobb Island to Smith Point- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY EVENING... .REST OF THIS AFTERNOON...S winds 10 kt. Waves 2 ft. Showers likely with a chance of tstms. Vsby 1 NM or less. .TONIGHT...SE winds 5 to 10 kt...becoming N 10 to 15 kt after midnight. Waves 1 to 2 ft. Showers and tstms likely. Vsby 1 NM or less. .FRI...N winds 10 to 15 kt with gusts to 25 kt. Waves 2 to 3 ft. A chance of showers. .FRI NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. .SAT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 to 3 ft. .SAT NIGHT...NE winds 5 to 10 kt. Waves 2 ft. .SUN...E winds 5 to 10 kt. Waves 1 to 2 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ530-010800- Chesapeake Bay north of Pooles Island- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH FRIDAY EVENING... .REST OF THIS AFTERNOON...W winds 5 kt. Waves less than 1 ft. Showers with tstms likely. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers with a chance of tstms. Vsby 1 NM or less. .FRI...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .FRI NIGHT...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SAT...N winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...NE winds around 5 kt. Waves 1 ft or less. .SUN...E winds around 5 kt. Waves flat. .MON...E winds around 5 kt. Waves flat. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ531-010800- Chesapeake Bay from Pooles Island to Sandy Point- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH FRIDAY EVENING... .REST OF THIS AFTERNOON...SE winds 10 kt. Waves 1 ft. Showers with tstms likely. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt...becoming N 15 to 20 kt late. Waves 1 to 2 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...NE winds 15 to 20 kt. Waves 2 ft. .FRI NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT...NE winds 10 to 15 kt. Waves 1 to 2 ft. .SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ538-010800- Patapsco River including Baltimore Harbor- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH FRIDAY EVENING... .REST OF THIS AFTERNOON...N winds 10 kt. Waves 1 ft. Showers with tstms likely. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .FRI NIGHT...N winds 5 to 10 kt with gusts to 20 kt. Waves 1 ft. .SAT...NE winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...NE winds around 5 kt. Waves 1 ft or less. .SUN...E winds around 5 kt. Waves 1 ft or less. .MON...E winds around 5 kt. Waves 1 ft or less. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ539-010800- Chester River to Queenstown MD- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH FRIDAY EVENING... .REST OF THIS AFTERNOON...W winds 5 kt. Waves less than 1 ft. Showers with tstms likely. Vsby 1 NM or less. .TONIGHT...NE winds 10 to 15 kt...becoming N late. Gusts up to 20 kt. Waves 1 to 2 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .FRI NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT...NE winds 5 to 10 kt. Waves 1 ft. .SAT NIGHT...E winds 5 kt. Waves less than 1 ft. .SUN...E winds around 5 kt. Waves 1 ft or less. .MON...E winds around 5 kt. Waves flat. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ532-010800- Chesapeake Bay from Sandy Point to North Beach- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH SATURDAY MORNING... .REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Showers with tstms likely. Vsby 1 NM or less. .TONIGHT...E winds 10 kt...becoming N after midnight. Gusts up to 20 kt. Waves 2 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...NE winds 15 to 20 kt. Waves 2 to 3 ft. .FRI NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ540-010800- Eastern Bay- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH SATURDAY MORNING... .REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Showers with tstms likely. Vsby 1 NM or less. .TONIGHT...E winds 5 to 10 kt...becoming N 10 to 15 kt after midnight. Gusts up to 20 kt. Waves 1 to 2 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .FRI NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft or less. .MON...E winds 5 kt. Waves less than 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ533-010800- Chesapeake Bay from North Beach to Drum Point- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH SATURDAY MORNING... .REST OF THIS AFTERNOON...S winds 10 kt. Waves 2 ft. Showers likely with a chance of tstms. Vsby 1 NM or less. .TONIGHT...E winds 10 kt...becoming N after midnight. Gusts up to 20 kt. Waves 2 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...N winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. .FRI NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. .SAT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 to 3 ft. .SAT NIGHT...E winds 5 to 10 kt. Waves 1 to 2 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ541-010800- Choptank River to Cambridge MD and the Little Choptank River- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM MIDNIGHT EDT TONIGHT THROUGH SATURDAY MORNING... .REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Showers likely with a chance of tstms. Vsby 1 NM or less. .TONIGHT...S winds 10 kt...becoming NE in the late evening and early morning, then becoming N late. Gusts up to 20 kt. Waves 1 to 2 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...N winds 15 to 20 kt. Waves 2 ft. .FRI NIGHT...NE winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. .SAT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SAT NIGHT...E winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds 5 kt. Waves less than 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ542-010800- Patuxent River to Broomes Island MD- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY MORNING... .REST OF THIS AFTERNOON...S winds 10 kt. Waves 1 ft. Showers likely with a chance of tstms. Vsby 1 NM or less. .TONIGHT...SE winds 5 to 10 kt...becoming N after midnight. Waves 1 ft. Showers with tstms likely. Vsby 1 NM or less. .FRI...N winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. A chance of showers. .FRI NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SAT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 ft. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 ft. .SUN...E winds 5 to 10 kt. Waves 1 ft. .MON...E winds around 5 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ534-010800- Chesapeake Bay from Drum Point to Smith Point- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY EVENING... .REST OF THIS AFTERNOON...S winds 15 kt. Waves 2 ft. A chance of showers and tstms. Vsby 1 NM or less. .TONIGHT...S winds 10 to 15 kt...becoming N after midnight. Waves 2 ft. A chance of showers and tstms. Vsby 1 NM or less. .FRI...N winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. A chance of showers. .FRI NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. .SAT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 3 ft. .SAT NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 2 ft. .SUN...E winds 10 to 15 kt. Waves 1 to 2 ft. .MON...E winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$ ANZ543-010800- Tangier Sound and the inland waters surrounding Bloodsworth Island- 437 PM EDT Thu Jul 31 2025 ...SEVERE THUNDERSTORM WATCH 562 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY MORNING THROUGH SATURDAY EVENING... .REST OF THIS AFTERNOON...S winds 15 kt. Waves 2 ft. A chance of showers and tstms. Vsby 1 NM or less. .TONIGHT...S winds 10 to 15 kt...becoming N after midnight. Waves 1 to 2 ft. Showers with a chance of tstms. Vsby 1 NM or less. .FRI...N winds 10 to 15 kt with gusts to 25 kt. Waves 2 ft. A chance of showers. Patchy fog. Vsby 1 to 3 NM. .FRI NIGHT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. A chance of showers. .SAT...NE winds 15 to 20 kt with gusts to 25 kt. Waves 2 ft. .SAT NIGHT...NE winds 10 to 15 kt with gusts to 20 kt. Waves 1 to 2 ft. .SUN...E winds 10 to 15 kt. Waves 1 ft. .MON...NE winds 5 to 10 kt. Waves 1 ft. Winds and waves higher and visibilities lower in and near tstms. $$