Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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597 FZUS51 KBOX 210804 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 404 AM EDT Tue May 21 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-212100- 404 AM EDT Tue May 21 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres remains planted off the Mid Atlantic coast today. The high drifts further southeast on Wed. A cold front moves into New Eng Thu. A weak high builds in on Fri. Unsettled through the weekend into early next week with several lows sliding through. $$ ANZ250-212100- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 404 AM EDT Tue May 21 2024 .TODAY...S winds 10 to 15 kt. Gusts up to 20 kt this afternoon. Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and S 2 ft at 4 seconds. Areas of dense fog this morning with vsby 1 NM or less. .TONIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 3 ft at 9 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 3 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. .THU AND THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. A chance of showers. .FRI THROUGH SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and S 1 foot at 4 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-212100- Massachusetts Bay and Ipswich Bay- 404 AM EDT Tue May 21 2024 .TODAY...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and S 2 ft at 4 seconds. Areas of dense fog this morning with vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and S 2 ft at 4 seconds. Patchy fog after midnight with vsby 1 NM or less. .WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 2 ft at 4 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: S 2 ft at 4 seconds and E 2 ft at 8 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 7 seconds. A chance of showers in the afternoon. .THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and E 1 foot at 7 seconds. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight. .FRI THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. 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. $$ ANZ231-212100- Cape Cod Bay- 404 AM EDT Tue May 21 2024 .TODAY...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 3 seconds. Areas of dense fog this morning with vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and SW 1 foot at 3 seconds. Patchy fog in the evening, then areas of fog after midnight with vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. A chance of showers. .FRI...SW winds 5 to 10 kt. Seas 1 foot or less. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-212100- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 404 AM EDT Tue May 21 2024 .TODAY...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and SW 1 foot at 3 seconds. Areas of dense fog this morning, then patchy fog this afternoon. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and SW 2 ft at 3 seconds. Patchy fog in the evening, then areas of dense fog after midnight. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 8 seconds and SW 2 ft at 4 seconds. Areas of fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. .THU...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and E 1 foot at 7 seconds. A chance of showers. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. 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. $$ ANZ255-212100- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 404 AM EDT Tue May 21 2024 .TODAY...SW winds around 5 kt, increasing to 5 to 10 kt this afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and SW 1 foot at 3 seconds. Areas of dense fog this morning, then patchy fog this afternoon. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and SW 2 ft at 4 seconds. Areas of dense fog. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 3 ft at 8 seconds. Areas of fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 5 seconds and E 2 ft at 8 seconds. .THU...SW winds 15 to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and E 2 ft at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 5 seconds and E 1 foot at 8 seconds. A chance of showers. .FRI...SW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds around 10 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-212100- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 404 AM EDT Tue May 21 2024 .TODAY...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 1 foot at 3 seconds. Areas of dense fog. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and SW 2 ft at 3 seconds. Areas of dense fog. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 3 ft at 9 seconds. Areas of fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 5 seconds and E 1 foot at 8 seconds. A chance of showers. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. .FRI NIGHT AND SAT...SW winds 5 to 10 kt, becoming SE. Seas 2 to 3 ft. .SAT NIGHT...SE winds around 10 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. $$ ANZ232-212100- Nantucket Sound- 404 AM EDT Tue May 21 2024 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SW 1 foot at 3 seconds. Areas of dense fog this morning with vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 9 seconds. Patchy fog in the evening, then areas of fog after midnight. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. Areas of fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds around 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. .THU...SW winds around 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 7 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 7 seconds. A chance of showers. .FRI...SW winds around 10 kt. Seas around 2 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-212100- Vineyard Sound- 404 AM EDT Tue May 21 2024 .TODAY...SW winds 5 to 10 kt. Gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 9 seconds. Areas of dense fog this morning, then patchy fog this afternoon. Vsby 1 NM or less. .TONIGHT...SW winds around 10 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot at 9 seconds. Patchy fog in the evening, then areas of fog after midnight. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 9 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. 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. $$ ANZ234-212100- Buzzards Bay- 404 AM EDT Tue May 21 2024 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas around 2 ft. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 9 seconds. Areas of dense fog this morning, then patchy fog this afternoon. Vsby 1 NM or less. .TONIGHT...SW winds around 10 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E 1 foot at 9 seconds. Patchy fog in the evening, then areas of fog after midnight. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 9 seconds. Areas of fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-212100- Rhode Island Sound- 404 AM EDT Tue May 21 2024 .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. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 9 seconds. Areas of dense fog this morning, then patchy fog this afternoon. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 10 seconds. Patchy fog in the evening, then areas of dense fog after midnight. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. .THU AND THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. 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. $$ ANZ237-212100- Block Island Sound- 404 AM EDT Tue May 21 2024 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. Areas of dense fog this morning, then patchy fog this afternoon. Vsby 1 NM or less. .TONIGHT...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds and SW 1 foot at 4 seconds. Patchy fog in the evening, then areas of fog after midnight. Vsby 1 NM or less. .WED...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 9 seconds. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. A chance of showers in the afternoon. .THU NIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight. .FRI THROUGH SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-212100- Boston Harbor- 404 AM EDT Tue May 21 2024 .TODAY...S winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft this afternoon. Patchy fog this morning with vsby 1 to 3 NM. .TONIGHT...SW winds around 10 kt. Waves around 2 ft. .WED...SW winds 10 to 15 kt. Waves around 2 ft. .WED NIGHT...SW 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...SW winds around 10 kt. Waves 1 foot or less. A chance of showers in the afternoon. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight. .FRI THROUGH SAT NIGHT...SE winds 5 to 10 kt. Waves 1 foot or less. 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. $$ ANZ236-212100- Narragansett Bay- 404 AM EDT Tue May 21 2024 .TODAY...S winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft this afternoon. Areas of dense fog this morning with vsby 1 NM or less. .TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog after midnight with vsby 1 NM or less. .WED...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves around 2 ft. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. .THU...SW winds 10 to 15 kt. Waves around 2 ft. A chance of showers in the afternoon. .THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Showers likely with a chance of tstms in the evening, then a chance of showers after midnight. .FRI THROUGH SAT NIGHT...SE winds 5 to 10 kt. Waves around 2 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/NWSBoston You can follow us on Twitter at @NWSBoston