Coastal Waters Forecast
Issued by NWS Boston, MA

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819 FZUS51 KBOX 051405 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 1004 AM EDT Sun May 5 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-060300- 1004 AM EDT Sun May 5 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... High pressure begins to move east tonight, but dry weather remains through Sunday morning. Weak low pressure and its attending cold front brings rain Sunday afternoon through Monday morning. Dry weather returns Monday evening through Tuesday. Then a frontal boundary sets up over or just south of New England Wednesday into next weekend. A series of lows will likely traverse this front, bringing periods of rain, fog and onshore flow. $$ ANZ250-060300- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 1 ft at 3 seconds. A slight chance of showers with vsby 1 to 3 NM. .TONIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 4 ft. Wave Detail: E 3 ft at 9 seconds and SE 1 ft at 4 seconds. Patchy fog. Showers. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .MON...S winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: E 3 ft at 10 seconds and S 2 ft at 5 seconds. Patchy fog in the morning. A chance of showers in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and S 2 ft at 5 seconds. .TUE AND TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and S 2 ft at 5 seconds. .WED AND WED NIGHT...S winds 5 to 10 kt, becoming N. Gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NE 4 ft at 7 seconds and S 3 ft at 5 seconds. A chance of showers. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-060300- Massachusetts Bay and Ipswich Bay- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and E 2 ft at 6 seconds. A chance of showers with vsby 1 to 3 NM. .TONIGHT...S winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 1 ft at 5 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .MON...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and S 1 ft at 4 seconds. Patchy fog in the morning. A chance of showers in the morning with vsby 1 NM or less. .MON NIGHT...S winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and S 1 ft at 5 seconds. A chance of showers in the evening. .TUE...N winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 10 seconds and S 1 ft at 5 seconds. .TUE NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 11 seconds. .WED AND WED NIGHT...SE winds 5 to 10 kt, becoming N. Gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ231-060300- Cape Cod Bay- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Gusts up to 20 kt. Seas around 2 ft. Wave Detail: E 2 ft at 10 seconds and SE 1 ft at 3 seconds. .TONIGHT...S winds around 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and SE 1 ft at 3 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .MON...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 10 seconds and S 1 ft at 3 seconds. Patchy fog in the morning. Showers in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 10 seconds and S 1 ft at 2 seconds. .TUE...N winds around 5 kt, becoming E in the afternoon. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: E 2 ft at 10 seconds and NE 1 ft at 2 seconds, becoming NE 1 ft at 2 seconds and S 1 ft at 2 seconds. .TUE NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 ft at 2 seconds and N 1 ft at 3 seconds. .WED...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .WED NIGHT...NW winds around 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .THU AND THU NIGHT...NE winds around 10 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-060300- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and E 3 ft at 10 seconds. Patchy fog. Vsby 1 to 3 NM. .TONIGHT...S winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and S 2 ft at 4 seconds. Patchy fog. A chance of showers in the evening, then showers likely after midnight with vsby 1 to 3 NM. .MON...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and E 4 ft at 10 seconds. Showers likely, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 10 to 15 kt, becoming W around 5 kt after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and E 3 ft at 10 seconds. .TUE...N winds 5 to 10 kt, becoming NE in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and S 2 ft at 5 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 3 ft at 11 seconds. .WED...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. .WED NIGHT THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ255-060300- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 5 seconds and E 2 ft at 11 seconds. .TONIGHT...S winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 7 seconds and S 2 ft at 5 seconds. Patchy fog. Showers likely after midnight with vsby 1 to 3 NM. .MON...SW winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 4 seconds and E 3 ft at 10 seconds. Showers. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds and E 3 ft at 10 seconds. A chance of showers in the evening. .TUE...N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 10 seconds and SW 2 ft at 5 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 2 ft at 11 seconds. .WED AND WED NIGHT...S winds 10 to 15 kt, becoming W. Gusts up to 20 kt. Seas 2 to 4 ft. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-060300- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 5 seconds and E 2 ft at 9 seconds. .TONIGHT...S winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and SE 2 ft at 5 seconds. Patchy fog. A chance of showers in the evening, then showers likely after midnight. Vsby 1 to 3 NM. .MON...S winds 15 to 20 kt, becoming SW 10 to 15 kt in the afternoon. Seas around 3 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at 10 seconds. Showers, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and E 2 ft at 10 seconds. .TUE...N winds 5 to 10 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at 10 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 2 ft at 11 seconds. .WED AND WED NIGHT...S winds 10 to 15 kt, becoming W. Gusts up to 20 kt. Seas 2 to 4 ft. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ232-060300- Nantucket Sound- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 10 seconds. .TONIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 9 seconds. Patchy fog. A chance of showers in the evening, then showers after midnight. Vsby 1 to 3 NM. .MON...S winds 15 to 20 kt, becoming SW 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 10 seconds. Showers, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 10 to 15 kt, becoming W around 5 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 2 ft at 10 seconds. .TUE...N winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: E 2 ft at 11 seconds and NE 1 ft at 2 seconds, becoming NE 1 ft at 2 seconds and S 1 ft at 5 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: E 1 ft at 2 seconds and S 1 ft at 5 seconds. .WED THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-060300- Vineyard Sound- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Seas 1 foot or less. Wave Detail: SE 1 ft at 4 seconds and SE 1 ft at 10 seconds. .TONIGHT...S winds 10 to 15 kt. Seas 1 foot or less. Wave Detail: SE 1 ft at 4 seconds and E 1 ft at 9 seconds. Patchy fog. A chance of showers in the evening, then showers after midnight. Vsby 1 to 3 NM. .MON...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E 1 ft at 5 seconds. Showers, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SW 2 ft at 5 seconds and E 1 ft at 10 seconds, becoming SW 1 ft at 5 seconds and E 1 ft at 10 seconds. .TUE...N winds 5 to 10 kt, becoming SE in the afternoon. Seas 1 foot or less. Wave Detail: N 1 ft at 2 seconds and SW 1 ft at 5 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 ft at 6 seconds and E 1 ft at 10 seconds. .WED THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ234-060300- Buzzards Bay- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Seas 1 foot or less. Wave Detail: SE 1 ft at 4 seconds and SE 1 ft at 10 seconds. .TONIGHT...S winds 10 to 15 kt. Seas 1 foot or less. Wave Detail: SE 1 ft at 3 seconds and E 1 ft at 9 seconds. Patchy fog. A chance of showers in the evening, then showers likely after midnight. Vsby 1 to 3 NM. .MON...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E 1 ft at 10 seconds. Showers, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SW 2 ft at 5 seconds and E 1 ft at 10 seconds, becoming SW 1 ft at 5 seconds and E 1 ft at 10 seconds. .TUE...N winds 5 to 10 kt, becoming S in the afternoon. Seas 1 foot or less. Wave Detail: N 1 ft at 2 seconds and SW 1 ft at 5 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 ft at 4 seconds and E 1 ft at 11 seconds. .WED THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-060300- Rhode Island Sound- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Gusts up to 20 kt. Seas around 2 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 6 seconds. .TONIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and SE 1 ft at 10 seconds. Patchy fog. A chance of showers in the evening, then showers after midnight. Vsby 1 to 3 NM. .MON...SW winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 2 ft. Wave Detail: SE 2 ft at 5 seconds and E 1 ft at 10 seconds. Showers likely, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds around 10 kt, becoming W after midnight. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds and E 1 ft at 10 seconds. .TUE...N winds 5 to 10 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and NE 1 ft at 5 seconds. .TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SE 1 ft at 10 seconds. .WED THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ237-060300- Block Island Sound- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 5 seconds and SE 1 ft at 10 seconds. .TONIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 5 seconds and SE 1 ft at 9 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .MON...SW winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 4 seconds and E 2 ft at 9 seconds. Showers likely, mainly in the morning. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at 10 seconds. .TUE AND TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds and E 2 ft at 10 seconds. .WED THROUGH THU NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 5 seconds and S 3 ft at 7 seconds. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-060300- Boston Harbor- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Gusts up to 20 kt. Waves 1 foot or less. A chance of showers. .TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 foot or less. Patchy fog. Showers. Vsby 1 to 3 NM. .MON...SW winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less. Patchy fog in the morning. A chance of showers in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Waves 1 foot or less. .TUE...N winds 5 to 10 kt, becoming SE in the afternoon. Waves 1 foot or less. .TUE NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. .WED AND WED NIGHT...S winds 5 to 10 kt, becoming N. Gusts up to 20 kt. Waves around 2 ft. A chance of showers. .THU AND THU NIGHT...NE winds around 10 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ236-060300- Narragansett Bay- 1004 AM EDT Sun May 5 2024 .THIS AFTERNOON...SE winds around 10 kt. Gusts up to 20 kt. Waves around 2 ft. .TONIGHT...S winds around 10 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM. .MON...S winds 5 to 10 kt. Waves around 2 ft. Patchy fog in the morning. Showers likely in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Waves around 2 ft. .TUE AND TUE NIGHT...SW winds 10 to 15 kt. Waves around 2 ft. .WED THROUGH THU NIGHT...NE winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/NWSBoston You can follow us on Twitter at @NWSBoston