Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 210754 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 354 AM EDT Sun Jul 21 2019 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-212015- 354 AM EDT Sun Jul 21 2019 .Synopsis for Massachusetts and Rhode Island coastal waters... Heat and humidity will linger across the waters today. Isolated showers and tstms may develop this afternoon into tonight as a frontal boundary slowly crosses the waters, then stalls near the south coast. Weak low pres will move along the stalled front late Mon into Tue, bringing showers and tstms, some with tropical downpours. Dry and more seasonable conditions return Wed and Thu as high pres building across the waters. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the Current Hazards link above the map on the left. $$ ANZ250-212015- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds around 10 kt. Seas 2 to 3 ft. .TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .MON...N winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. A chance of showers. .MON NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers. Vsby 1 to 3 NM. .TUE NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM. .WED...NE winds around 5 kt. Seas around 2 ft. .WED NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .THU...NE winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-212015- Massachusetts Bay and Ipswich Bay- 354 AM EDT Sun Jul 21 2019 .TODAY...W winds 5 to 10 kt. Seas 1 foot or less. .TONIGHT...NW winds 5 to 10 kt. Seas 1 foot or less. .MON...N winds around 5 kt, becoming E in the afternoon. Seas 1 foot or less. A chance of showers. .MON NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...NE winds 5 to 10 kt. Seas around 2 ft. Showers. Vsby 1 to 3 NM. .TUE NIGHT...W winds around 5 kt. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...E winds around 5 kt. Seas 1 foot or less. .WED NIGHT...SW winds around 5 kt. Seas 1 foot or less. .THU...NE winds around 5 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. 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. $$ ANZ231-212015- Cape Cod Bay- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 5 to 10 kt. Seas around 2 ft. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...NW winds 5 to 10 kt. Seas 1 foot or less. .MON...N winds 5 to 10 kt, becoming E in the afternoon. Seas 1 foot or less. A chance of showers. .MON NIGHT...E winds 5 to 10 kt. Seas around 2 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...N winds 5 to 10 kt. Seas around 2 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...NE winds around 5 kt, becoming NW around 5 kt after midnight. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...NE winds around 5 kt. Seas 1 foot or less. .WED NIGHT...SW winds around 5 kt. Seas 1 foot or less. .THU...N winds around 5 kt. Seas around 2 ft. .THU NIGHT...SW winds around 5 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-212015- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog this morning with vsby 1 to 3 NM. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 4 ft. .MON...N winds 5 to 10 kt, becoming E in the afternoon. Seas 2 to 3 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt. Gusts up to 20 kt after midnight. Seas 2 to 4 ft. Showers likely with a chance of tstms. Vsby 1 to 3 NM. .TUE...NW winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to 5 ft. Showers and tstms. .TUE NIGHT...N winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...E winds around 5 kt. Seas 2 to 4 ft. .WED NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...NW winds around 5 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. 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. $$ ANZ255-212015- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas 2 to 4 ft. Patchy fog this morning with vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 4 ft. .MON...N winds around 5 kt, becoming E in the afternoon. Seas 2 to 3 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt, becoming SW with gusts up to 20 kt after midnight. Seas 3 to 5 ft. Showers likely with a chance of tstms. .TUE...NW winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to 5 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...N winds 5 to 10 kt, becoming NE after midnight. Seas 3 to 5 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...SE winds around 5 kt. Seas 2 to 4 ft. .WED NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 NM. .THU...SW winds around 5 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 NM. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-212015- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 354 AM EDT Sun Jul 21 2019 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 4 ft. Patchy fog this morning with vsby 1 to 3 NM. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 4 ft. .MON...N winds around 5 kt, becoming E in the afternoon. Seas around 3 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 3 to 5 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...NW winds 5 to 10 kt with gusts up to 20 kt. Seas 3 to 5 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...NE winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers. Vsby 1 to 3 NM. .WED...SE winds around 5 kt. Seas 3 to 4 ft. .WED NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. .THU...E winds around 5 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. 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. $$ ANZ232-212015- Nantucket Sound- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas around 2 ft. Patchy fog this morning. A slight chance of showers with isolated tstms this afternoon. Vsby 1 to 3 NM this morning. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 3 ft. .MON...N winds around 5 kt, becoming E in the afternoon. Seas around 2 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt, becoming S with gusts up to 20 kt after midnight. Seas 2 to 3 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...W winds 5 to 10 kt with gusts up to 20 kt, becoming N in the afternoon. Seas 2 to 3 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...N winds 5 to 10 kt, becoming NE after midnight. Seas 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...E winds around 5 kt. Seas around 2 ft. .WED NIGHT...SW winds around 5 kt. Seas around 2 ft. .THU...N winds around 5 kt. Seas around 2 ft. .THU NIGHT...SW winds around 5 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-212015- Vineyard Sound- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Patchy fog this morning. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW around 5 kt after midnight. Seas 2 to 3 ft. .MON...N winds around 5 kt, becoming E in the afternoon. Seas around 2 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...NW winds 5 to 10 kt. Seas 2 to 3 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...N winds around 5 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds around 5 kt. Seas around 2 ft. .WED NIGHT...SW winds around 5 kt. Seas around 2 ft. .THU...SW winds around 5 kt. Seas around 2 ft. .THU NIGHT...SW winds around 5 kt. Seas around 2 ft. Winds and seas higher in and near tstms. 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. $$ ANZ234-212015- Buzzards Bay- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas around 2 ft. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW around 5 kt after midnight. Seas around 2 ft. .MON...N winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...NW winds 5 to 10 kt. Seas 2 to 3 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...N winds around 5 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds around 5 kt. Seas around 2 ft. .WED NIGHT...SW winds around 5 kt. Seas around 2 ft. .THU...SE winds around 5 kt. Seas 1 foot or less. .THU NIGHT...SW winds around 5 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-212015- Rhode Island Sound- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Patchy fog this morning. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 3 ft. .MON...N winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. A chance of showers. .MON NIGHT...SE winds 5 to 10 kt. Seas 2 to 4 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE...NW winds 5 to 10 kt. Seas 2 to 4 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...N winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds around 5 kt. Seas 2 to 3 ft. .WED NIGHT...SW winds around 5 kt. Seas around 2 ft. .THU...SW winds around 5 kt. Seas around 2 ft. .THU NIGHT...SW winds around 5 kt. Seas around 2 ft. Winds and seas higher in and near tstms. 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. $$ ANZ237-212015- Block Island Sound- 354 AM EDT Sun Jul 21 2019 .TODAY...W winds 5 to 10 kt, becoming SW 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 3 ft. .MON...N winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Showers likely with a chance of tstms. .MON NIGHT...SE winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 4 ft. Patchy fog. Showers and tstms. Vsby 1 to 3 NM. .TUE...NW winds 5 to 10 kt. Seas 2 to 4 ft. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...N winds around 5 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...SE winds around 5 kt. Seas 2 to 3 ft. .WED NIGHT...W winds around 5 kt. Seas around 2 ft. .THU...SE winds around 5 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-212015- Boston Harbor- 354 AM EDT Sun Jul 21 2019 .TODAY...W winds 5 to 10 kt. Waves 1 foot or less. .TONIGHT...NW winds 5 to 10 kt. Waves 1 foot or less. .MON...N winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. A chance of showers. .MON NIGHT...NE winds around 5 kt. Waves 1 foot or less. Patchy fog. Showers. Vsby 1 to 3 NM. .TUE...NE winds around 5 kt. Waves 1 foot or less. Showers. Vsby 1 to 3 NM. .TUE NIGHT...E winds around 5 kt, becoming W around 5 kt after midnight. Waves 1 foot or less. A chance of showers. Vsby 1 to 3 NM. .WED...E winds around 5 kt. Waves 1 foot or less. .WED NIGHT...SW winds around 5 kt. Waves 1 foot or less. .THU...NE winds around 5 kt. Waves 1 foot or less. .THU NIGHT...SW winds around 5 kt. Waves 1 foot or less. 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. $$ ANZ236-212015- Narragansett Bay- 354 AM EDT Sun Jul 21 2019 .TODAY...SW winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Waves around 2 ft. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...NW winds 5 to 10 kt. Waves around 2 ft. .MON...N winds around 5 kt, becoming SE in the afternoon. Waves around 2 ft. Showers likely with a chance of tstms. .MON NIGHT...SE winds 5 to 10 kt, becoming N after midnight. Waves around 2 ft. Patchy fog. Showers and tstms. Vsby 1 to 3 NM. .TUE...N winds around 5 kt. Waves 2 to 3 ft. Patchy fog. Showers and tstms. Vsby 1 to 3 NM. .TUE NIGHT...NW winds around 5 kt. Waves around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds around 5 kt. Waves around 2 ft. .WED NIGHT...W winds around 5 kt. Waves around 2 ft. .THU...W winds around 5 kt. Waves around 2 ft. .THU NIGHT...SW winds around 5 kt. Waves around 2 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/us.nationalweatherservice.boston.gov You can follow us on Twitter at @NWSBoston

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