Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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662 FZUS51 KBOX 200804 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 404 AM EDT Fri Sep 20 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-202100- 404 AM EDT Fri Sep 20 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... Low pres SE of Nantucket will continue to combine with high pres over SE Quebec to generate gusty NE winds and building seas with periods of rain into early Sun. This low pres then move farther out to sea as high pres moves S from Quebec. Improving weather Sun into early next week. $$ ANZ250-202100- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 7 to 9 ft, building to 8 to 11 ft this afternoon. Wave Detail: E 8 ft at 9 seconds and NE 4 ft at 5 seconds, becoming E 8 ft at 9 seconds and NE 6 ft at 6 seconds. Showers likely. Vsby 1 to 3 NM. .TONIGHT...NE winds around 25 kt with gusts up to 35 kt. Seas 9 to 11 ft. Wave Detail: E 10 ft at 10 seconds and NE 6 ft at 7 seconds. Showers likely, mainly in the evening with vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 8 to 11 ft. Wave Detail: E 10 ft at 10 seconds and N 5 ft at 6 seconds. A chance of showers. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 7 to 9 ft. Wave Detail: E 9 ft at 9 seconds and NE 4 ft at 7 seconds. A chance of showers. .SUN AND SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 7 to 9 ft. Wave Detail: E 8 ft at 10 seconds and NE 1 foot at 5 seconds. .MON THROUGH TUE...E winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 8 ft. Wave Detail: E 8 ft at 11 seconds and NE 1 foot at 3 seconds. .TUE NIGHT...E winds around 10 kt. Seas 5 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-202100- Massachusetts Bay and Ipswich Bay- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...NE winds 15 to 20 kt, increasing to 20 to 25 kt this afternoon. Gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 8 ft at 9 seconds and NE 5 ft at 6 seconds. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 9 ft. Wave Detail: E 9 ft at 9 seconds and NE 5 ft at 6 seconds. A chance of showers. Vsby 1 to 3 NM in the evening. .SAT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 9 ft. Wave Detail: E 9 ft at 10 seconds and NE 5 ft at 6 seconds. A chance of showers. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 7 ft. Wave Detail: E 7 ft at 9 seconds and NE 3 ft at 6 seconds. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 2 ft at 4 seconds. .MON AND MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 5 to 7 ft. Wave Detail: E 7 ft at 10 seconds and NE 1 foot at 4 seconds. .TUE AND TUE NIGHT...E winds around 10 kt. Seas 4 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. $$ ANZ231-202100- Cape Cod Bay- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...NE winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft, building to 5 to 8 ft this afternoon. Wave Detail: E 6 ft at 8 seconds and N 4 ft at 4 seconds, becoming E 6 ft at 9 seconds and N 5 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM. .TONIGHT...NE winds 20 to 25 kt with gusts up to 40 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 9 seconds and N 6 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM in the evening. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 9 seconds and N 6 ft at 6 seconds. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: NE 6 ft at 9 seconds and N 5 ft at 6 seconds. Showers likely, mainly in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 6 ft. Wave Detail: E 5 ft at 10 seconds and N 4 ft at 6 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 5 to 6 ft. Wave Detail: E 5 ft at 10 seconds and N 3 ft at 4 seconds. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. .TUE AND TUE NIGHT...E winds around 10 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-202100- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 404 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .TODAY...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 9 to 12 ft. Wave Detail: NE 11 ft at 9 seconds and N 4 ft at 5 seconds. Showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 10 to 13 ft. Wave Detail: NE 12 ft at 10 seconds and N 5 ft at 6 seconds. Showers. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 9 to 12 ft. Wave Detail: NE 12 ft at 10 seconds and N 3 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 8 to 10 ft. Wave Detail: NE 10 ft at 9 seconds and NE 3 ft at 5 seconds. A chance of showers. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 10 ft. Wave Detail: E 9 ft at 10 seconds and NE 2 ft at 5 seconds. A chance of showers. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 10 ft. Wave Detail: E 9 ft at 10 seconds and NE 1 foot at 4 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt. Gusts up to 25 kt. Seas 7 to 10 ft. .TUE AND TUE NIGHT...E winds 10 to 15 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. $$ ANZ255-202100- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 404 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .TODAY...NE winds 25 to 35 kt with gusts up to 40 kt. Seas 8 to 11 ft. Wave Detail: NE 9 ft at 7 seconds. Showers. Vsby 1 to 3 NM. .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to 11 ft. Wave Detail: E 10 ft at 9 seconds and N 5 ft at 6 seconds. Showers likely. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 7 to 10 ft. Wave Detail: E 10 ft at 10 seconds and N 5 ft at 6 seconds. Showers likely. Vsby 1 to 3 NM in the morning. .SAT NIGHT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Seas 6 to 9 ft. Wave Detail: E 9 ft at 9 seconds and N 4 ft at 5 seconds. Showers likely, mainly in the evening. .SUN...NE winds 20 to 25 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 10 seconds and NE 4 ft at 5 seconds. A chance of showers. .SUN NIGHT...NE winds around 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 11 seconds and NE 3 ft at 5 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-202100- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 404 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .TODAY...N winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. Wave Detail: E 6 ft at 8 seconds and N 5 ft at 5 seconds. A chance of showers. Vsby 1 to 3 NM this afternoon. .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. Wave Detail: N 6 ft at 6 seconds and E 6 ft at 9 seconds. A chance of showers. Vsby 1 to 3 NM in the evening. .SAT...N winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 6 to 9 ft. Wave Detail: N 6 ft at 6 seconds and E 6 ft at 10 seconds. A chance of showers. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 6 ft at 9 seconds and N 5 ft at 5 seconds. A chance of showers. .SUN...NE winds 20 to 25 kt. Seas 5 to 7 ft. Wave Detail: E 7 ft at 10 seconds and NE 4 ft at 5 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 3 ft at 5 seconds. .MON THROUGH TUE...NE winds 15 to 20 kt. Seas 5 to 7 ft. .TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 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. $$ ANZ232-202100- Nantucket Sound- 404 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH THIS EVENING... .TODAY...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: N 5 ft at 5 seconds and E 5 ft at 9 seconds. Showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 5 ft at 9 seconds and N 4 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM in the evening. .SAT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 5 ft at 10 seconds and N 4 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM in the morning. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 10 seconds. Showers likely, mainly in the evening. .SUN...NE winds 20 to 25 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 4 seconds and E 3 ft at 10 seconds. A chance of showers. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 4 ft at 10 seconds and NE 3 ft at 4 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-202100- Vineyard Sound- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 8 seconds. Showers likely. Vsby 1 to 3 NM. .TONIGHT...N winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 9 seconds. Showers likely. Vsby 1 to 3 NM in the evening. .SAT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 10 seconds. Showers likely. .SAT NIGHT...NE winds 15 to 20 kt. Gusts up to 30 kt in the evening. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 10 seconds. Showers likely, mainly in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: NE 2 ft at 4 seconds and E 2 ft at 10 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: NE 2 ft at 4 seconds and E 2 ft at 10 seconds. .MON THROUGH TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 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. $$ ANZ234-202100- Buzzards Bay- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 8 seconds. Showers likely. Vsby 1 to 3 NM this afternoon. .TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. A chance of showers in the evening, then showers likely after midnight. Vsby 1 to 3 NM in the evening. .SAT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 10 seconds. Showers likely. .SAT NIGHT...NE winds 15 to 20 kt. Gusts up to 30 kt in the evening. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 10 seconds. Showers likely, mainly in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and N 2 ft at 4 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and NE 2 ft at 4 seconds. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-202100- Rhode Island Sound- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and SE 3 ft at 8 seconds. A chance of showers. .TONIGHT...N winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SE 3 ft at 9 seconds. A chance of showers. Vsby 1 to 3 NM in the evening. .SAT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SE 3 ft at 9 seconds. A chance of showers. .SAT NIGHT...N winds 20 to 25 kt with gusts up to 30 kt, becoming NE 15 to 20 kt after midnight. Seas 4 to 5 ft. Wave Detail: N 4 ft at 5 seconds and SE 3 ft at 9 seconds. A chance of showers. .SUN...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 E 3 ft at 10 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and SE 3 ft at 11 seconds. .MON THROUGH TUE NIGHT...E winds 15 to 20 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. $$ ANZ237-202100- Block Island Sound- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...N winds 15 to 20 kt, increasing to 20 to 25 kt this afternoon. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: E 4 ft at 8 seconds and N 3 ft at 5 seconds. A chance of showers. .TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 9 seconds. A chance of showers. .SAT...N winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and N 3 ft at 5 seconds. A chance of showers. .SAT NIGHT...NE winds 15 to 20 kt. Gusts up to 30 kt, decreasing to 20 kt after midnight. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and N 3 ft at 5 seconds. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and NE 3 ft at 5 seconds. .MON THROUGH TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 11 seconds and E 3 ft at 5 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-202100- Boston Harbor- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...NE winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. A chance of showers. Vsby 1 to 3 NM in the evening. .SAT...NE winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft, except 4 to 6 ft at the outer harbor entrance. A chance of showers. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt after midnight. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. A chance of showers. .SUN AND SUN 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. .MON THROUGH TUE NIGHT...E winds 5 to 10 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. $$ ANZ236-202100- Narragansett Bay- 404 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TODAY...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. A chance of showers. .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. A chance of showers. .SAT...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. A chance of showers. .SAT NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .MON THROUGH TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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