Coastal Waters Forecast
Issued by NWS Boston, MA

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364 FZUS51 KBOX 182305 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 704 PM EDT Sat May 18 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-191200- 704 PM EDT Sat May 18 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... Light scattered showers with low ceilings and areas of fog continue this afternoon and evening as low pressure continues to spin well off shore to the east. Shower chances decrease for Sunday. High pressure builds in late Sunday with dry conditions persisting through early next week. $$ ANZ250-191200- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 704 PM EDT Sat May 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE SUNDAY NIGHT... .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 8 seconds and NE 1 foot at 3 seconds. Areas of fog. A chance of rain. Vsby 1 NM or less. .SUN...NE winds around 15 kt with gusts up to 20 kt. Seas 5 to 6 ft. Wave Detail: E 5 ft at 8 seconds. Patchy fog. A chance of rain in the morning with vsby 1 NM or less. .SUN NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 4 to 6 ft. Wave Detail: E 5 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .MON...NE winds 5 to 10 kt, becoming E in the afternoon. Seas 4 to 5 ft. Wave Detail: E 4 ft at 8 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 9 seconds and S 2 ft at 3 seconds. .WED THROUGH THU...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and E 3 ft at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-191200- Massachusetts Bay and Ipswich Bay- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and NE 1 foot at 3 seconds. Areas of fog. Rain likely, mainly this evening. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog. A chance of rain in the morning with vsby 1 NM or less. .SUN NIGHT...NE winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog. Vsby 1 to 3 NM after midnight. .MON...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 9 seconds and S 2 ft at 4 seconds. .WED THROUGH THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 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 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. $$ ANZ231-191200- Cape Cod Bay- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt this evening. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and N 2 ft at 4 seconds. Areas of dense fog. A chance of rain. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and N 2 ft at 4 seconds. Patchy fog. A chance of rain in the morning. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and N 2 ft at 4 seconds. Patchy fog. Vsby 1 to 3 NM. .MON...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and N 1 foot at 4 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at 11 seconds. .WED THROUGH THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-191200- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 704 PM EDT Sat May 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE SUNDAY NIGHT... .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 8 seconds and NE 1 foot at 3 seconds. Areas of dense fog. A chance of rain. Vsby 1 NM or less. .SUN...NE winds around 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 4 to 6 ft. Wave Detail: E 5 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog. Vsby 1 to 3 NM in the evening. .MON...NE winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft at 8 seconds and SE 1 foot at 11 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and SW 2 ft at 3 seconds. .WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E 3 ft at 8 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. $$ ANZ255-191200- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 704 PM EDT Sat May 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and N 2 ft at 4 seconds. Areas of dense fog. A slight chance of rain this evening. A chance of rain after midnight. Vsby 1 NM or less. .SUN...NE winds 15 to 20 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 8 seconds and NE 2 ft at 4 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Seas 3 to 5 ft. Wave Detail: E 4 ft at 8 seconds and NE 2 ft at 4 seconds. Patchy fog. .MON...NE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds and SW 2 ft at 3 seconds. .WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and E 2 ft at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-191200- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 704 PM EDT Sat May 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 PM EDT THIS EVENING... .TONIGHT...NE 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 N 2 ft at 4 seconds. Areas of fog. A slight chance of rain. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and N 2 ft at 4 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds and NE 2 ft at 4 seconds. Patchy fog. .MON...NE winds around 10 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and N 1 foot at 3 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SW 2 ft at 4 seconds. .WED THROUGH THU...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 E 3 ft at 9 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 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. $$ ANZ232-191200- Nantucket Sound- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 3 seconds. Areas of dense fog. A chance of rain. Vsby 1 NM or less. .SUN...NE winds around 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NE 2 ft at 3 seconds and E 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 4 seconds. Patchy fog. Vsby 1 to 3 NM. .MON...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 8 seconds. .WED THROUGH THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-191200- Vineyard Sound- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and N 1 foot at 4 seconds. Areas of fog. A chance of rain. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 1 foot at 4 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and SW 1 foot at 7 seconds. Patchy fog. Vsby 1 to 3 NM in the evening. .MON...NE winds around 10 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and NW 1 foot at 5 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 foot at 8 seconds and SE 1 foot at 11 seconds. .WED THROUGH THU...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 NIGHT...SW winds 10 to 15 kt with gusts up to 20 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. $$ ANZ234-191200- Buzzards Bay- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt this evening. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and N 1 foot at 4 seconds. Areas of fog. A chance of rain. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: N 2 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and E 2 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .MON...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and NE 1 foot at 2 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at 11 seconds. .WED THROUGH THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-191200- Rhode Island Sound- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and N 2 ft at 4 seconds. Areas of fog. A slight chance of rain. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: N 2 ft at 4 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 2 ft at 7 seconds. Patchy fog. Vsby 1 to 3 NM after midnight. .MON...NE winds around 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: NE 2 ft at 3 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 8 seconds. .WED THROUGH THU...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 2 ft at 9 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 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. $$ ANZ237-191200- Block Island Sound- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 9 seconds and NE 2 ft at 3 seconds. Areas of fog. A slight chance of rain. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 3 seconds. Patchy fog. Vsby 1 NM or less in the morning. .SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and NE 2 ft at 4 seconds. Patchy fog. Vsby 1 to 3 NM after midnight. .MON...NE winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SW 1 foot at 3 seconds. .WED THROUGH THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 10 seconds. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-191200- Boston Harbor- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt this evening. Waves 2 to 3 ft. Areas of fog. Rain likely this evening. A chance of rain after midnight. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Patchy fog. A chance of rain in the morning with vsby 1 NM or less. .SUN NIGHT...NE winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. Patchy fog. .MON...E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt. Waves around 2 ft. .WED THROUGH THU...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 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. $$ ANZ236-191200- Narragansett Bay- 704 PM EDT Sat May 18 2024 .TONIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt this evening. Waves around 2 ft. Areas of fog. A chance of rain this evening. A slight chance of rain after midnight. Vsby 1 NM or less. .SUN...NE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. Patchy fog in the morning with vsby 1 NM or less. .SUN NIGHT...NE winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Waves around 2 ft. Patchy fog. Vsby 1 to 3 NM after midnight. .MON...NE winds 5 to 10 kt, becoming E in the afternoon. Waves around 2 ft. Patchy fog in the morning. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. .WED THROUGH THU...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .THU NIGHT...SW winds 10 to 15 kt. Waves around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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