Coastal Waters Forecast
Issued by NWS Boston, MA

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688 FZUS51 KBOX 210504 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 103 AM EDT Sat Sep 21 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-211800- 103 AM EDT Sat Sep 21 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 $$ ANZ250-211800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds around 25 kt with gusts up to 35 kt. Seas 11 to 12 ft. Wave Detail: E 11 ft at 10 seconds and NE 5 ft at 7 seconds. Areas of fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 10 to 12 ft. Wave Detail: E 11 ft at 10 seconds and NE 3 ft at 6 seconds. Showers, mainly in the morning. Areas of fog in the morning. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 11 ft, subsiding to 7 to 9 ft after midnight. Wave Detail: E 9 ft at 9 seconds and NE 2 ft at 5 seconds, becoming E 7 ft at 9 seconds and NE 1 foot at 4 seconds. A chance of showers in the evening with vsby 1 to 3 NM. .SUN...NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Seas 7 to 10 ft. Wave Detail: E 7 ft at 9 seconds and NE 1 foot at 4 seconds. .SUN NIGHT AND MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 7 to 10 ft. Wave Detail: E 7 ft at 10 seconds and NE 1 foot at 4 seconds. .MON NIGHT...E winds around 10 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 10 seconds. .TUE THROUGH WED...E winds around 10 kt. Seas 5 to 7 ft. .WED NIGHT...E winds around 10 kt. Seas 5 to 6 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-211800- Massachusetts Bay and Ipswich Bay- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft. Wave Detail: E 10 ft at 10 seconds and NE 5 ft at 6 seconds. Areas of fog. Showers. 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. Showers, mainly in the morning. Areas of fog in the morning. 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. A chance of showers in the evening with vsby 1 to 3 NM. .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. $$ ANZ231-211800- Cape Cod Bay- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds around 25 kt with gusts up to 35 kt. Seas 6 to 8 ft. Wave Detail: E 8 ft at 9 seconds and N 6 ft at 5 seconds. Areas of fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 8 ft. Wave Detail: E 8 ft at 9 seconds and N 6 ft at 5 seconds. Showers. Areas of fog in the morning. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 9 seconds and N 4 ft at 5 seconds. Showers likely in the evening with vsby 1 to 3 NM. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 9 seconds and N 3 ft at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 10 seconds and N 3 ft at 4 seconds. .TUE THROUGH WED...E winds around 10 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 10 seconds and NE 1 foot at 2 seconds. .WED NIGHT...E winds around 10 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-211800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF 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 2 ft at 5 seconds. Areas of fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 10 to 14 ft. Wave Detail: E 12 ft at 10 seconds and NE 2 ft at 5 seconds. Showers. Areas of fog in the morning. Vsby 1 to 3 NM, decreasing to 1 NM or less in the afternoon. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 9 to 12 ft. Wave Detail: E 10 ft at 9 seconds and NE 2 ft at 4 seconds. A chance of showers in the evening with vsby 1 to 3 NM. .SUN...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 8 to 11 ft. Wave Detail: E 8 ft at 9 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 10 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. 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. $$ ANZ255-211800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to 11 ft, except 12 to 13 ft S and E of Nantucket. Wave Detail: E 10 ft at 9 seconds and N 5 ft at 6 seconds. Areas of fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to 11 ft, except 11 to 13 ft S and E of Nantucket. Wave Detail: E 10 ft at 10 seconds and N 5 ft at 5 seconds. Showers. Areas of fog in the morning. Vsby 1 to 3 NM, decreasing to 1 NM or less in the afternoon. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft, except 10 to 13 ft S and E of Nantucket. Wave Detail: E 9 ft at 9 seconds and N 4 ft at 5 seconds. A chance of showers. Vsby 1 to 3 NM. .SUN...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft, except 10 to 12 ft S and E of Nantucket. Wave Detail: E 7 ft at 9 seconds and N 4 ft at 4 seconds. .SUN NIGHT...NE winds around 20 kt with gusts up to 25 kt. Seas 7 to 10 ft. Wave Detail: E 8 ft at 10 seconds and NE 3 ft at 4 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 11 seconds and NE 2 ft at 4 seconds. .TUE AND TUE NIGHT...NE winds 10 to 15 kt. Seas 5 to 7 ft. .WED...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-211800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE 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. Areas of fog. Showers. .SAT...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. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 9 seconds and N 5 ft at 5 seconds. A chance of showers in the evening with vsby 1 to 3 NM. .SUN...NE winds 20 to 25 kt, diminishing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: E 7 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 and NE 1 foot at 3 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. $$ ANZ232-211800- Nantucket Sound- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 9 seconds and N 5 ft at 6 seconds. Areas of fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 10 seconds and N 4 ft at 5 seconds. Showers. Areas of fog in the morning. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 10 seconds. A chance of showers. Vsby 1 to 3 NM. .SUN...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 4 seconds and E 3 ft at 9 seconds. .SUN NIGHT AND MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 4 ft at 11 seconds and NE 3 ft at 4 seconds. .MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 5 ft. Wave Detail: E 4 ft at 11 seconds and NE 3 ft at 4 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 3 to 5 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-211800- Vineyard Sound- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF 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 2 ft at 9 seconds. Areas of fog. Showers. .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. Showers. Areas of fog in the morning. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 30 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. Vsby 1 to 3 NM 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 10 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. $$ ANZ234-211800- Buzzards Bay- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. Areas of fog. Showers. .SAT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. Showers. Areas of fog in the morning. Vsby 1 to 3 NM. .SAT NIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 10 seconds. A chance of showers. Vsby 1 to 3 NM in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and N 2 ft at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and NE 2 ft at 4 seconds. .TUE THROUGH WED...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 11 seconds and NE 1 foot at 2 seconds. .WED NIGHT...E winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-211800- Rhode Island Sound- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE 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. Areas of fog. Showers. .SAT...N winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 5 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SE 4 ft at 9 seconds. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...N winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. 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. A chance of showers. Vsby 1 to 3 NM 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 9 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: E 4 ft at 11 seconds and NE 3 ft at 4 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. $$ ANZ237-211800- Block Island Sound- 103 AM EDT Sat Sep 21 2024 ...GALE WARNING IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 9 seconds. A chance of showers. .SAT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 9 seconds and N 4 ft at 5 seconds. A chance of showers. Vsby 1 to 3 NM in the afternoon. .SAT NIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 9 seconds and NE 3 ft at 5 seconds. A chance of showers in the evening with vsby 1 to 3 NM. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and NE 3 ft at 4 seconds. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 11 seconds and NE 2 ft at 5 seconds. .TUE THROUGH WED...E winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 11 seconds and NE 1 foot at 4 seconds. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-211800- Boston Harbor- 103 AM EDT Sat Sep 21 2024 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. Areas of fog. Showers likely. .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. Showers, mainly in the morning. Areas of fog in the morning. Vsby 1 to 3 NM in the afternoon. .SAT NIGHT...NE winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. A chance of showers in the evening with vsby 1 to 3 NM. .SUN...NE winds 15 to 20 kt with gusts up to 25 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. $$ ANZ236-211800- Narragansett Bay- 103 AM EDT Sat Sep 21 2024 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Waves around 3 ft, except 4 to 6 ft at the bay entrance. A chance of showers. .SAT...N winds 15 to 20 kt with gusts up to 30 kt. Waves around 3 ft, except 4 to 6 ft at the bay entrance. Showers likely. Vsby 1 to 3 NM in the afternoon. .SAT NIGHT...N winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM in the evening. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .SUN NIGHT THROUGH MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TUE THROUGH WED...E winds 5 to 10 kt. Waves 2 to 4 ft. .WED NIGHT...E winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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