Coastal Waters Forecast
Issued by NWS Boston, MA

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490 FZUS51 KBOX 100806 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 406 AM EDT Fri May 10 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-102100- 406 AM EDT Fri May 10 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... Light rain showers continue this morning, heaviest for the southern waters. Rain linger into the afternoon before tapering off overnight. Mainly dry Saturday and Sunday with cool onshore flow. Unsettled wet weather returns late Monday and lasts through Wednesday with the arrival of a warm front. $$ ANZ250-102100- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 10 seconds. A slight chance of showers this morning. .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 4 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 10 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 6 seconds and SE 1 foot at 9 seconds. .SAT NIGHT...NE winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 7 seconds and SE 1 foot at 10 seconds. .SUN...NE winds 5 to 10 kt. Seas around 4 ft. Wave Detail: E 4 ft at 8 seconds and S 1 foot at 8 seconds. .SUN NIGHT...S winds 5 to 10 kt, becoming W after midnight. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and W 1 foot at 3 seconds. .MON THROUGH TUE...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-102100- Massachusetts Bay and Ipswich Bay- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 6 seconds and E 1 foot at 10 seconds. A slight chance of showers this morning. .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. Wave Detail: E 3 ft at 7 seconds and E 1 foot at 11 seconds. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Seas around 3 ft. Wave Detail: NE 3 ft at 6 seconds and S 1 foot at 8 seconds. .SAT NIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 7 seconds and S 1 foot at 9 seconds. .SUN...NE winds 5 to 10 kt, becoming E in the afternoon. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and S 1 foot at 8 seconds. .SUN NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds and SW 1 foot at 3 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .TUE...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of rain. 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. $$ ANZ231-102100- Cape Cod Bay- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 6 seconds. A chance of showers this morning. A slight chance of showers this afternoon. .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 8 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 3 seconds and S 1 foot at 8 seconds. .SAT NIGHT...NE winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 9 seconds. .SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 8 seconds. .SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 6 seconds and S 1 foot at 8 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .TUE...SW winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-102100- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 406 AM EDT Fri May 10 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH SATURDAY EVENING... .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 7 seconds and S 2 ft at 7 seconds. A chance of showers, mainly this morning. .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 7 seconds and S 2 ft at 9 seconds. .SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft at 7 seconds and S 2 ft at 9 seconds. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 4 to 6 ft. Wave Detail: E 5 ft at 7 seconds and S 2 ft at 9 seconds. .SUN...NE winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft at 8 seconds and S 1 foot at 8 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 8 seconds and S 2 ft at 9 seconds. .MON THROUGH TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of rain. 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. $$ ANZ255-102100- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 406 AM EDT Fri May 10 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH SATURDAY EVENING... .TODAY...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 4 seconds and S 2 ft at 7 seconds. Showers likely, mainly this morning. .TONIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and S 2 ft at 8 seconds. A chance of showers after midnight. .SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 5 ft at 5 seconds and S 2 ft at 9 seconds. .SAT NIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 5 ft. Wave Detail: NE 5 ft at 7 seconds and S 2 ft at 8 seconds. A chance of showers in the evening. .SUN...NE winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: E 4 ft at 8 seconds and S 2 ft at 8 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds and S 2 ft at 8 seconds. .MON THROUGH TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-102100- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 406 AM EDT Fri May 10 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM 8 AM EDT THIS MORNING THROUGH SATURDAY EVENING... .TODAY...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 5 seconds and S 2 ft at 7 seconds. Showers likely, mainly this morning. .TONIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and S 2 ft at 9 seconds. .SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and S 2 ft at 9 seconds. .SAT NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 6 seconds and S 1 foot at 8 seconds. .SUN...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and S 1 foot at 8 seconds. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and W 1 foot at 2 seconds. .MON THROUGH TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. A chance of rain. 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. $$ ANZ232-102100- Nantucket Sound- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt, increasing to 15 to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 4 seconds and S 1 foot at 7 seconds. A chance of showers, mainly this morning. .TONIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 4 seconds and S 1 foot at 8 seconds. .SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 4 seconds and S 1 foot at 9 seconds. .SAT NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 6 seconds and S 1 foot at 9 seconds. A chance of showers in the evening. .SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 8 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and W 1 foot at 4 seconds. .MON THROUGH TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-102100- Vineyard Sound- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt, increasing to 15 to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 7 seconds. Showers likely, mainly this morning. .TONIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 8 seconds. .SAT...NE winds 15 to 20 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 9 seconds. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 8 seconds. .SUN...E winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NE 1 foot at 4 seconds and S 1 foot at 8 seconds. .SUN NIGHT...W winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and SE 1 foot at 7 seconds. .MON...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .MON NIGHT AND TUE...SW winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain. 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. $$ ANZ234-102100- Buzzards Bay- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt, increasing to 15 to 20 kt this afternoon. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 7 seconds. A chance of showers, mainly this morning. .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 8 seconds. .SAT...NE winds 15 to 20 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 9 seconds. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and S 1 foot at 8 seconds. .SUN...E winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NE 1 foot at 2 seconds and S 1 foot at 8 seconds. .SUN NIGHT...W winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 5 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .TUE...SW winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-102100- Rhode Island Sound- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and S 2 ft at 7 seconds. Showers likely, mainly this morning. .TONIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: NE 4 ft at 5 seconds and S 2 ft at 9 seconds. .SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: NE 3 ft at 4 seconds and S 2 ft at 9 seconds. .SAT NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 5 seconds and S 1 foot at 8 seconds. .SUN...NE winds around 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: NE 2 ft at 7 seconds and S 2 ft at 8 seconds. .SUN NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 8 seconds and E 2 ft at 8 seconds. .MON THROUGH TUE...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of rain. 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. $$ ANZ237-102100- Block Island Sound- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 5 seconds and S 2 ft at 7 seconds. Showers likely, mainly this morning. .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 5 seconds and S 2 ft at 9 seconds. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 5 seconds and S 2 ft at 8 seconds. .SAT NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 6 seconds and S 1 foot at 8 seconds. .SUN...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SE 1 foot at 14 seconds. .SUN NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and W 1 foot at 2 seconds. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. .TUE...SW winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of showers. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-102100- Boston Harbor- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Waves around 2 ft. A slight chance of showers this morning. .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. .SAT...NE winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves 2 to 3 ft. .SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Waves around 2 ft in the evening, then 1 foot or less. .SUN...NE winds 5 to 10 kt, becoming E in the afternoon. Waves 1 foot or less. .SUN NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .TUE...SW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft. A chance of showers. .TUE NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft. A chance of rain. 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. $$ ANZ236-102100- Narragansett Bay- 406 AM EDT Fri May 10 2024 .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers, mainly this morning. .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. .SAT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Waves 2 to 3 ft. .SUN...NE winds 5 to 10 kt, becoming SE in the afternoon. Waves around 2 ft. .SUN NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .MON AND MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TUE...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds around 15 kt with gusts up to 25 kt. Waves 2 to 4 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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