Coastal Waters Forecast
Issued by NWS Boston, MA

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685 FZUS51 KBOX 202004 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 403 PM EDT Fri Sep 20 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-210900- 403 PM EDT Fri Sep 20 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... Rainy and gusty NE winds continue through Saturday due to a low pres SE of Nantucket. Gale force wind gusts continue overnight and possibly into Saturday. Conditions begin to improve Sun with high pressure building in by Mon, lasting through Wed $$ ANZ250-210900- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds around 25 kt with gusts up to 35 kt. Seas 10 to 12 ft. Wave Detail: E 11 ft at 10 seconds and NE 6 ft at 7 seconds. Patchy fog. Showers likely. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .SAT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 10 to 12 ft. Wave Detail: E 11 ft at 10 seconds and NE 3 ft at 6 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 11 ft, subsiding to 7 to 9 ft after midnight. Wave Detail: E 9 ft at 9 seconds and NE 2 ft at 5 seconds, becoming E 8 ft at 9 seconds and NE 1 foot at 4 seconds. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 7 to 10 ft. Wave Detail: E 8 ft at 10 seconds and NE 1 foot at 4 seconds. .SUN NIGHT AND MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 7 to 10 ft. Wave Detail: E 8 ft at 10 seconds and NE 1 foot at 4 seconds. .MON NIGHT...E winds around 10 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 11 seconds. .TUE THROUGH WED...E winds around 10 kt. Seas 5 to 7 ft. .WED NIGHT...E winds around 10 kt. Seas 5 to 6 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-210900- Massachusetts Bay and Ipswich Bay- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft. Wave Detail: E 9 ft at 9 seconds and NE 5 ft at 7 seconds. Patchy fog. Showers likely, mainly this evening. 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 NE 5 ft at 6 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 10 seconds and NE 3 ft at 5 seconds. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 9 seconds and NE 1 foot at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 1 foot at 4 seconds. .TUE THROUGH WED...E winds 5 to 10 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 10 seconds. .WED NIGHT...E winds around 10 kt. Seas 4 to 5 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. $$ ANZ231-210900- Cape Cod Bay- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds around 25 kt with gusts up to 40 kt. Seas 6 to 8 ft. Wave Detail: E 8 ft at 9 seconds and N 6 ft at 5 seconds. Patchy fog. Showers. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 8 ft. Wave Detail: E 8 ft at 10 seconds and N 6 ft at 5 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 9 seconds and N 4 ft at 5 seconds. Patchy fog in the evening. A chance of showers in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 9 seconds and N 3 ft at 5 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 10 seconds and N 3 ft at 4 seconds. .TUE THROUGH WED...E winds around 10 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 10 seconds and NE 1 foot at 2 seconds. .WED NIGHT...E winds around 10 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-210900- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 10 to 14 ft. Wave Detail: NE 13 ft at 10 seconds and NE 3 ft at 6 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .SAT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 10 to 14 ft. Wave Detail: NE 12 ft at 10 seconds and NE 2 ft at 5 seconds. Patchy fog. Showers likely in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 9 to 12 ft. Wave Detail: E 10 ft at 9 seconds and NE 2 ft at 4 seconds. Patchy fog. A chance of showers in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 11 ft. Wave Detail: E 9 ft at 10 seconds and NE 1 foot at 4 seconds. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 9 to 12 ft, subsiding to 8 to 10 ft after midnight. Wave Detail: E 9 ft at 10 seconds and NE 1 foot at 4 seconds, becoming E 9 ft at 11 seconds and NE 1 foot at 3 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt. Seas 7 to 10 ft. Wave Detail: E 9 ft at 11 seconds and NE 1 foot at 3 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 5 to 8 ft. .WED NIGHT...E winds around 10 kt. Seas 5 to 6 ft. A chance of showers. 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. $$ ANZ255-210900- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to 11 ft, except 12 to 13 ft S and E of Nantucket. Wave Detail: E 10 ft at 10 seconds and N 5 ft at 6 seconds. Patchy fog. Showers with isolated tstms. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .SAT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 8 to 11 ft, except 11 to 13 ft S and E of Nantucket. Wave Detail: E 10 ft at 10 seconds and N 5 ft at 5 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft, except 10 to 13 ft S and E of Nantucket. Wave Detail: E 9 ft at 10 seconds and N 4 ft at 5 seconds. Patchy fog. A chance of showers. .SUN...NE winds 20 to 25 kt. Seas 7 to 10 ft, except 10 to 12 ft S and E of Nantucket. Wave Detail: E 7 ft at 10 seconds and N 3 ft at 4 seconds. .SUN NIGHT...NE winds around 20 kt with gusts up to 25 kt. Seas 7 to 10 ft. Wave Detail: E 8 ft at 10 seconds and NE 3 ft at 5 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 11 seconds and NE 2 ft at 4 seconds. .TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas 5 to 7 ft. .WED...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-210900- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. Wave Detail: E 7 ft at 9 seconds and N 6 ft at 6 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt with gusts up to 35 kt. Seas 6 to 9 ft. Wave Detail: E 7 ft at 9 seconds and N 6 ft at 6 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 10 seconds and N 5 ft at 5 seconds. A chance of showers. Patchy fog in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 9 seconds and N 4 ft at 5 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 3 ft at 5 seconds. .TUE THROUGH WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 11 seconds. .WED NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 5 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. $$ ANZ232-210900- Nantucket Sound- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 9 seconds and N 5 ft at 5 seconds. Patchy fog. Showers. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .SAT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 5 to 7 ft. Wave Detail: E 6 ft at 10 seconds and N 4 ft at 5 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 10 seconds. A chance of showers. Patchy fog in the evening. .SUN...NE winds around 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: NE 4 ft at 4 seconds and E 3 ft at 10 seconds. .SUN NIGHT AND MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 4 ft at 10 seconds and NE 3 ft at 4 seconds. .MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 5 ft. Wave Detail: E 5 ft at 11 seconds and NE 3 ft at 4 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 3 to 5 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-210900- Vineyard Sound- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 25 to 30 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. Patchy fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. Patchy fog. Showers likely in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: N 3 ft at 4 seconds and E 2 ft at 10 seconds. A chance of showers. Patchy fog in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: N 2 ft at 4 seconds and E 2 ft at 10 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 11 seconds and NE 2 ft at 4 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 11 seconds and NE 1 foot at 3 seconds. .WED NIGHT...E winds 10 to 15 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. $$ ANZ234-210900- Buzzards Bay- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. Patchy fog. Showers likely in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 10 seconds. Patchy fog in the evening. A chance of showers in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and N 2 ft at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and NE 2 ft at 4 seconds. .TUE THROUGH WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 11 seconds and NE 1 foot at 2 seconds. .WED NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-210900- Rhode Island Sound- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SE 4 ft at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SE 4 ft at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 5 ft. Wave Detail: N 4 ft at 5 seconds and SE 4 ft at 9 seconds. Patchy fog in the evening. A chance of showers in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: E 4 ft at 10 seconds and NE 3 ft at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and E 4 ft at 12 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 11 seconds and NE 1 foot at 3 seconds. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 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. $$ ANZ237-210900- Block Island Sound- 403 PM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 9 seconds and N 4 ft at 5 seconds. Patchy fog. A slight chance of showers this evening. A chance of showers after midnight. .SAT...N winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 9 seconds and NE 4 ft at 5 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM in the morning. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 9 seconds and NE 3 ft at 5 seconds. A chance of showers in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and NE 3 ft at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 12 seconds and NE 3 ft at 5 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 11 seconds and NE 1 foot at 4 seconds. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-210900- Boston Harbor- 403 PM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .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. Patchy fog. Showers likely this evening. A chance of showers after midnight. Vsby 1 to 3 NM. .SAT...NE winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 3 ft, except 5 to 7 ft at the outer harbor entrance. Patchy fog. A chance of showers. Vsby 1 to 3 NM in the morning. .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. A chance of showers in the evening. .SUN...NE winds around 15 kt with gusts up to 20 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TUE AND TUE NIGHT...E winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .WED AND WED NIGHT...E winds 5 to 10 kt. Waves 2 to 3 ft, then 1 foot or less. At the outer harbor entrance, waves 2 to 4 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. $$ ANZ236-210900- Narragansett Bay- 403 PM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Waves around 3 ft, except 4 to 6 ft at the bay entrance. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT...N winds 15 to 20 kt with gusts up to 30 kt. Waves around 3 ft, except 4 to 6 ft at the bay entrance. Patchy fog. A chance of showers. Vsby 1 to 3 NM in the morning. .SAT NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers in the evening. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TUE THROUGH WED...E winds 5 to 10 kt. Waves 2 to 4 ft. .WED NIGHT...E winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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