Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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475 FZUS51 KBOX 110904 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 404 AM EST Tue Nov 11 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-112200- 404 AM EST Tue Nov 11 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... Strong cold front passes through the region and over the waters tonight with a high chance for W gale force wind gusts on Tue. Another cold front will approach and cross the waters later Wed into Thu. $$ ANZ250-112200- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt. Gusts up to 30 kt, increasing to 40 kt this afternoon. Seas 5 to 7 ft. Wave Detail: W 6 ft at 5 seconds and SE 4 ft at 8 seconds. A slight chance of showers and flurries this afternoon. .TONIGHT...W winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Gusts up to 40 kt. Seas 5 to 8 ft. Wave Detail: W 7 ft at 6 seconds and SE 3 ft at 10 seconds. .WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft, subsiding to 3 to 4 ft in the afternoon. Wave Detail: SW 5 ft at 5 seconds and SE 2 ft at 11 seconds, becoming SW 4 ft at 5 seconds and SE 2 ft at 12 seconds. .WED NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE 1 foot at 11 seconds. .THU...W winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and SE 1 foot at 9 seconds. .THU NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: NW 4 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers in the evening. .FRI THROUGH SAT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. .SAT NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-112200- Massachusetts Bay and Ipswich Bay- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt. Gusts up to 25 kt, increasing to 35 kt this afternoon. Seas 3 to 4 ft. Wave Detail: W 4 ft at 4 seconds and E 3 ft at 8 seconds. A slight chance of flurries this afternoon. .TONIGHT...W winds 25 to 30 kt with gusts up to 40 kt, diminishing to 20 to 25 kt with gusts up to 30 kt after midnight. Seas 3 to 4 ft. Wave Detail: W 4 ft at 4 seconds and E 2 ft at 9 seconds. .WED...SW winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at 12 seconds. .WED NIGHT...W winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and E 1 foot at 12 seconds. .THU AND THU NIGHT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and SE 1 foot at 9 seconds. .FRI THROUGH SAT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft at 5 seconds. .SAT NIGHT...NW winds 15 to 20 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. $$ ANZ231-112200- Cape Cod Bay- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 15 to 20 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 40 kt this afternoon. Seas 3 to 5 ft. Wave Detail: W 4 ft at 4 seconds and SE 2 ft at 7 seconds. A slight chance of showers and flurries this afternoon. .TONIGHT...W winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Gusts up to 40 kt. Seas 3 to 4 ft. Wave Detail: W 4 ft at 5 seconds and S 2 ft at 9 seconds. .WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and S 2 ft at 10 seconds. A chance of showers in the morning. .WED NIGHT...W winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and S 1 foot at 10 seconds. .THU AND THU NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NW 3 ft at 4 seconds and S 1 foot at 10 seconds. .FRI THROUGH SAT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: N 3 ft at 6 seconds. .SAT NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-112200- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 5 to 7 ft, building to 6 to 9 ft this afternoon. Wave Detail: S 6 ft at 9 seconds and W 4 ft at 5 seconds, becoming W 6 ft at 5 seconds and S 5 ft at 9 seconds. A slight chance of showers and flurries this afternoon. .TONIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft, except 9 to 13 ft S and E of Nantucket. Wave Detail: W 7 ft at 6 seconds and S 4 ft at 9 seconds. .WED...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: W 5 ft at 6 seconds and S 5 ft at 11 seconds. A chance of showers. .WED NIGHT...W winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft at 10 seconds and W 3 ft at 5 seconds. .THU...W winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 4 ft at 10 seconds and NW 3 ft at 4 seconds. A chance of showers in the afternoon. .THU NIGHT...NW winds 20 to 25 kt. Seas 5 to 7 ft. Wave Detail: NW 5 ft at 5 seconds and S 2 ft at 9 seconds. A chance of showers in the evening. .FRI...NW winds 20 to 25 kt. Seas 4 to 6 ft. A chance of showers. .FRI NIGHT...NW winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers. .SAT...NW winds 15 to 20 kt. Seas 3 to 4 ft. .SAT NIGHT...NW winds around 15 kt with gusts up to 20 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. $$ ANZ255-112200- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 25 to 35 kt with gusts up to 40 kt. Seas 7 to 10 ft. Wave Detail: SW 10 ft at 8 seconds and S 6 ft at 10 seconds. A chance of showers this afternoon. .TONIGHT...W winds 30 to 40 kt, diminishing to 25 to 35 kt after midnight. Seas 9 to 12 ft, subsiding to 7 to 10 ft after midnight. Wave Detail: W 12 ft at 9 seconds and S 3 ft at 9 seconds, becoming W 10 ft at 9 seconds and S 3 ft at 10 seconds. .WED...SW winds 25 to 30 kt, becoming W 20 to 25 kt in the afternoon. Seas 6 to 9 ft. Wave Detail: SW 9 ft at 9 seconds and S 9 ft at 11 seconds. A chance of showers. .WED NIGHT...W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: SW 8 ft at 9 seconds and W 1 foot at 5 seconds. .THU...W winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Seas 5 to 8 ft. Wave Detail: SW 7 ft at 9 seconds. A chance of showers in the afternoon. .THU NIGHT...NW winds 25 to 30 kt. Seas 6 to 9 ft. Wave Detail: W 8 ft at 8 seconds and SW 3 ft at 9 seconds. .FRI...NW winds 20 to 25 kt. Seas 5 to 7 ft. .FRI NIGHT AND SAT...NW winds 20 to 25 kt, diminishing to 15 to 20 kt. Seas 3 to 5 ft. .SAT NIGHT...NW winds 15 to 20 kt. Seas 2 to 3 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-112200- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 25 to 35 kt with gusts up to 40 kt. Seas 7 to 8 ft, building to 8 to 11 ft this afternoon. Wave Detail: W 8 ft at 7 seconds and S 5 ft at 9 seconds, becoming W 11 ft at 8 seconds and S 4 ft at 9 seconds. A chance of showers this afternoon. .TONIGHT...W winds 30 to 40 kt, diminishing to 25 to 30 kt after midnight. Seas 9 to 12 ft, subsiding to 7 to 10 ft after midnight. Wave Detail: W 12 ft at 9 seconds and S 4 ft at 10 seconds, becoming W 10 ft at 9 seconds and S 5 ft at 10 seconds. .WED...W winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 8 ft. Wave Detail: SW 8 ft at 8 seconds and S 8 ft at 10 seconds. A chance of showers in the morning. .WED NIGHT...W winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 7 ft. Wave Detail: SW 7 ft at 9 seconds and W 2 ft at 5 seconds. .THU AND THU NIGHT...NW winds 25 to 30 kt. Seas 5 to 8 ft. Wave Detail: W 7 ft at 7 seconds and SW 7 ft at 9 seconds. .FRI...NW winds 20 to 25 kt. Seas 4 to 6 ft. Wave Detail: NW 6 ft at 6 seconds and SE 1 foot at 10 seconds. .FRI NIGHT...NW winds 20 to 25 kt. Seas 3 to 5 ft. .SAT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .SAT NIGHT...NW winds 15 to 20 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. $$ ANZ232-112200- Nantucket Sound- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 4 to 6 ft. Wave Detail: W 5 ft at 5 seconds and SE 2 ft at 9 seconds. A slight chance of showers this afternoon. .TONIGHT...W winds 30 to 35 kt, diminishing to 25 to 30 kt after midnight. Seas 4 to 6 ft. Wave Detail: W 6 ft at 5 seconds and S 2 ft at 10 seconds. .WED...W winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: W 4 ft at 5 seconds and S 3 ft at 10 seconds. A chance of showers. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: W 3 ft at 4 seconds and S 3 ft at 10 seconds. .THU AND THU NIGHT...NW winds 20 to 25 kt. Seas 3 to 5 ft. Wave Detail: W 4 ft at 4 seconds and SW 2 ft at 9 seconds. .FRI THROUGH SAT...NW winds 20 to 25 kt. Seas 2 to 4 ft. Wave Detail: W 4 ft at 4 seconds and S 1 foot at 9 seconds. .SAT NIGHT...NW winds 15 to 20 kt. Seas around 2 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-112200- Vineyard Sound- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and S 4 ft at 9 seconds. A slight chance of showers this afternoon. .TONIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: W 7 ft at 7 seconds and SW 5 ft at 9 seconds. .WED...W winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 9 seconds and SW 4 ft at 6 seconds. A chance of showers. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 9 seconds and W 2 ft at 5 seconds. .THU AND THU NIGHT...NW winds 20 to 25 kt. Seas 3 to 5 ft. Wave Detail: W 4 ft at 7 seconds and SW 4 ft at 9 seconds. .FRI AND FRI NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: W 4 ft at 6 seconds. .SAT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .SAT NIGHT...NW winds 10 to 15 kt. Seas 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. $$ ANZ234-112200- Buzzards Bay- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and S 3 ft at 9 seconds. A slight chance of showers and flurries this afternoon. .TONIGHT...W winds 25 to 30 kt with gusts up to 40 kt, diminishing to 20 to 25 kt with gusts up to 30 kt after midnight. Seas 4 to 6 ft. Wave Detail: W 5 ft at 6 seconds and SW 5 ft at 9 seconds. .WED...W winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and SW 4 ft at 9 seconds. A chance of showers in the morning. .WED NIGHT...W winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 9 seconds and W 2 ft at 5 seconds. .THU AND THU NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 9 seconds and W 3 ft at 6 seconds. .FRI THROUGH SAT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 6 seconds and S 1 foot at 9 seconds. .SAT NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-112200- Rhode Island Sound- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 5 to 7 ft, building to 6 to 9 ft this afternoon. Wave Detail: W 6 ft at 7 seconds and S 6 ft at 9 seconds, becoming W 7 ft at 7 seconds and S 7 ft at 9 seconds. A slight chance of showers this afternoon. .TONIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft, subsiding to 5 to 7 ft after midnight. Wave Detail: SW 8 ft at 9 seconds and W 7 ft at 7 seconds, becoming SW 7 ft at 9 seconds and W 5 ft at 6 seconds. .WED...W winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 9 seconds and SW 5 ft at 6 seconds. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 9 seconds and W 2 ft at 5 seconds. .THU AND THU NIGHT...NW winds 20 to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 9 seconds and W 5 ft at 6 seconds. .FRI THROUGH SAT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: W 4 ft at 6 seconds and S 1 foot at 10 seconds. .SAT NIGHT...NW winds around 15 kt. Seas 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. $$ ANZ237-112200- Block Island Sound- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH WEDNESDAY MORNING... .TODAY...W winds 20 to 25 kt with gusts up to 30 kt, increasing to 25 to 30 kt with gusts up to 40 kt this afternoon. Seas 4 to 6 ft, building to 5 to 8 ft this afternoon. Wave Detail: W 5 ft at 5 seconds and S 4 ft at 9 seconds, becoming W 6 ft at 5 seconds and S 4 ft at 9 seconds. A slight chance of showers this afternoon. .TONIGHT...W winds 25 to 30 kt with gusts up to 40 kt, diminishing to 20 to 25 kt with gusts up to 30 kt after midnight. Seas 5 to 7 ft. Wave Detail: W 6 ft at 6 seconds and S 4 ft at 9 seconds. .WED...W winds around 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 9 seconds and W 4 ft at 5 seconds. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 9 seconds and W 3 ft at 4 seconds. .THU AND THU NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 4 ft at 9 seconds and W 3 ft at 4 seconds. .FRI THROUGH SAT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 4 seconds and S 1 foot at 9 seconds. .SAT NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-112200- Boston Harbor- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .TODAY...W winds 15 to 20 kt with gusts up to 25 kt, increasing to 20 to 25 kt with gusts up to 35 kt this afternoon. Waves around 2 ft. A slight chance of flurries this afternoon. .TONIGHT...W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 35 kt. Waves around 2 ft. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .WED NIGHT...W winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft in the evening, then 1 foot or less. .THU AND THU NIGHT...W winds 15 to 20 kt. Waves around 2 ft. .FRI THROUGH SAT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .SAT NIGHT...NW winds 10 to 15 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. $$ ANZ236-112200- Narragansett Bay- 404 AM EST Tue Nov 11 2025 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .TODAY...W winds 15 to 20 kt, increasing to 20 to 25 kt this afternoon. Gusts up to 35 kt. Waves 3 to 5 ft. A slight chance of showers and flurries this afternoon. .TONIGHT...W winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 35 kt. Waves 3 to 5 ft. .WED...W winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 3 ft. .WED NIGHT...W winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves 2 to 3 ft. .THU AND THU NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .FRI THROUGH SAT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .SAT NIGHT...NW winds around 10 kt. Waves 1 foot or less. A chance of rain. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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