Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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941 FZUS51 KBOX 170505 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 104 AM EDT Tue Sep 17 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-171800- 104 AM EDT Tue Sep 17 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres over New England will continue to provide dry, tranquil boating weather through much of Wed. Low pres near the Carolinas and mid-Atlantic coast then spreads a period of enhanced onshore easterly winds, building seas and periods of rain late Wed and into Thurs. High pres then returns for Fri into the weekend, with a continued enhanced east-northeast breeze. $$ ANZ250-171800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 8 seconds. .TUE...SW winds 5 to 10 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot at 3 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SW 1 foot at 3 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...S winds around 5 kt, becoming E in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SW 1 foot at 3 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .WED NIGHT AND THU...NE winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 10 seconds and E 1 foot at 3 seconds. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 3 to 5 ft. Wave Detail: E 5 ft at 9 seconds. A chance of showers. .FRI...NE winds around 15 kt with gusts up to 25 kt. Seas 5 to 7 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-171800- Massachusetts Bay and Ipswich Bay- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and E 2 ft at 7 seconds. .TUE...SW winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SW 1 foot at 2 seconds. .TUE NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 7 seconds and S 1 foot at 3 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...S winds around 5 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds and E 1 foot at 6 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .WED NIGHT THROUGH THU NIGHT...NE winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 7 seconds and E 4 ft at 10 seconds. A chance of showers. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 8 seconds and SE 3 ft at 9 seconds. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 6 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. $$ ANZ231-171800- Cape Cod Bay- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...W winds around 5 kt, becoming SE in the afternoon. Seas 1 foot or less. Wave Detail: W 1 foot at 2 seconds and E 1 foot at 7 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SE 2 ft at 8 seconds and S 1 foot at 2 seconds, becoming SW 1 foot at 2 seconds and E 1 foot at 7 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...E winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 5 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .WED NIGHT THROUGH THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds and E 2 ft at 10 seconds. A chance of showers. Vsby 1 to 3 NM. .FRI...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: N 2 ft at 3 seconds and SE 2 ft at 9 seconds. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-171800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .TUE...S winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 12 seconds. .TUE NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 12 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and SE 2 ft at 12 seconds. A chance of showers in the afternoon. .WED NIGHT...E winds around 10 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and SE 2 ft at 11 seconds. A chance of showers in the evening. Showers likely after midnight. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: NE 5 ft at 7 seconds and SE 4 ft at 8 seconds. A chance of showers. Vsby 1 to 3 NM. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 7 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 8 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. $$ ANZ255-171800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds. .TUE...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds. .TUE NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 12 seconds. .WED...E winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and SE 1 foot at 12 seconds. A chance of showers. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and E 1 foot at 3 seconds. Showers likely. Vsby 1 to 3 NM. .THU...NE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and SE 2 ft at 11 seconds. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt. Seas 4 to 5 ft. A chance of showers. .FRI...NE winds 15 to 20 kt. Seas 4 to 6 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-171800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...E winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds. .TUE...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 9 seconds and SE 1 foot at 13 seconds. .WED...E winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and SE 1 foot at 12 seconds. A chance of showers. Vsby 1 to 3 NM in the afternoon. .WED NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 4 to 6 ft. Wave Detail: SE 5 ft at 8 seconds and SE 1 foot at 12 seconds. Showers likely in the evening. A chance of showers after midnight. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at 8 seconds and NE 2 ft at 4 seconds. A chance of showers. .FRI...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 20 to 25 kt. Seas 5 to 7 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. $$ ANZ232-171800- Nantucket Sound- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...S winds around 5 kt. Seas around 2 ft. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 7 seconds. .TUE...NE winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: E 1 foot at 7 seconds and SE 1 foot at 9 seconds. .TUE NIGHT...SE winds around 5 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SE 1 foot at 4 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...E winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers in the afternoon. .WED NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers in the evening. Showers likely after midnight. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 7 seconds. A chance of showers. .FRI...NE winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-171800- Vineyard Sound- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...S winds around 5 kt. Seas 1 foot or less. Wave Detail: E 1 foot at 7 seconds and SE 1 foot at 9 seconds. .TUE...N winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds and E 1 foot at 7 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...SE winds around 5 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds and S 1 foot at 2 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...E winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. A chance of showers. .WED NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 3 seconds. A chance of showers. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds and NE 1 foot at 3 seconds. A chance of showers. .FRI...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 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. $$ ANZ234-171800- Buzzards Bay- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...S winds around 5 kt. Seas 1 foot or less. Wave Detail: E 1 foot at 7 seconds and SE 1 foot at 9 seconds. Patchy fog. Vsby 1 NM or less. .TUE...N winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SW 1 foot at 3 seconds and E 1 foot at 7 seconds, becoming SE 2 ft at 9 seconds and E 1 foot at 7 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...SE winds around 5 kt. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SE 2 ft at 9 seconds and SE 1 foot at 2 seconds, becoming E 1 foot at 3 seconds and SE 1 foot at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .WED...E winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .WED NIGHT THROUGH THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 3 seconds. A chance of showers. .FRI...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: NE 2 ft at 3 seconds and SE 2 ft at 9 seconds. A chance of showers. .FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .SAT AND SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-171800- Rhode Island Sound- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...SE winds around 5 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds. .TUE...NE winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and SE 1 foot at 13 seconds. .WED...E winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and SE 1 foot at 13 seconds. A chance of showers. .WED NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and NE 1 foot at 3 seconds. A chance of showers. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 7 seconds and NE 2 ft at 3 seconds. A chance of showers. .FRI...NE winds 15 to 20 kt. Seas 3 to 4 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 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. $$ ANZ237-171800- Block Island Sound- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...E winds around 5 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 9 seconds. Patchy fog. Vsby 1 NM or less. .TUE...NE winds around 5 kt, becoming E in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds. .WED...NE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and E 1 foot at 3 seconds. A chance of showers. .WED NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and NE 1 foot at 3 seconds. A chance of showers. Vsby 1 to 3 NM. .THU AND THU NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 7 seconds and NE 1 foot at 4 seconds. A chance of showers. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-171800- Boston Harbor- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .TUE...SW 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. Patchy fog after midnight with vsby 1 to 3 NM. .WED...S winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Patchy fog in the morning with vsby 1 to 3 NM. .WED NIGHT THROUGH THU NIGHT...N winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. 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. $$ ANZ236-171800- Narragansett Bay- 104 AM EDT Tue Sep 17 2024 .REST OF TONIGHT...W winds around 5 kt. Waves around 2 ft. Patchy fog. Vsby 1 NM or less. .TUE...N winds around 5 kt, becoming S in the afternoon. Waves 2 to 3 ft. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...S winds around 5 kt, becoming E around 5 kt after midnight. Waves 2 to 3 ft. Patchy fog after midnight with vsby 1 to 3 NM. .WED...NE winds around 5 kt, becoming E in the afternoon. Waves 2 to 3 ft. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .WED NIGHT THROUGH THU NIGHT...NE winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers. .FRI...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers. .FRI NIGHT THROUGH SAT NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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