Coastal Waters Forecast
Issued by NWS Boston, MA

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902 FZUS51 KBOX 151104 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 704 AM EDT Wed May 15 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-160000- 704 AM EDT Wed May 15 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres to our east will maintan a modest southerly flow over the waters today. Low pres to then move E from the Mid Atlc coast tonight into Thu, shifting winds to the SE to E across the waters. This low pres slowly moves farther out to sea through Sat. Weak high pres expected across the waters for Sun. $$ ANZ250-160000- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 704 AM EDT Wed May 15 2024 .TODAY...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 8 seconds. .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and S 1 foot at 3 seconds. A chance of showers after midnight. .THU...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 9 seconds and S 2 ft at 9 seconds. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 9 seconds and E 3 ft at 9 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 9 seconds and E 4 ft at 9 seconds. .SAT THROUGH SUN NIGHT...E winds around 10 kt. Seas 4 to 5 ft. Wave Detail: E 4 ft at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-160000- Massachusetts Bay and Ipswich Bay- 704 AM EDT Wed May 15 2024 .TODAY...S winds 5 to 10 kt. Seas around 2 ft this morning, then 1 foot or less. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 3 seconds, becoming S 1 foot at 3 seconds and E 1 foot at 7 seconds. A slight chance of showers this afternoon. .TONIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 7 seconds and SE 1 foot at 3 seconds. A chance of showers after midnight. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 7 seconds and SE 1 foot at 3 seconds. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 6 seconds and SE 2 ft at 9 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 2 ft at 9 seconds. .SAT AND SAT NIGHT...E winds around 10 kt. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds. .SUN AND SUN NIGHT...NE 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. $$ ANZ231-160000- Cape Cod Bay- 704 AM EDT Wed May 15 2024 .TODAY...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 8 seconds. .TONIGHT...S winds 5 to 10 kt, becoming E after midnight. Seas 1 foot or less, then around 2 ft after midnight. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 7 seconds, becoming E 2 ft at 7 seconds and S 2 ft at 11 seconds. A chance of showers. .THU...E winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 2 ft at 10 seconds and E 1 foot at 4 seconds. Showers likely, mainly in the morning. .THU NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and E 1 foot at 3 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 9 seconds and N 1 foot at 3 seconds. .SAT THROUGH SUN NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: NE 1 foot at 3 seconds and S 1 foot at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-160000- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 704 AM EDT Wed May 15 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY EVENING... .TODAY...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 7 seconds and S 1 foot at 4 seconds. .TONIGHT...SE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts up to 20 kt after midnight. Seas around 2 ft, building to 3 to 5 ft after midnight. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 4 seconds, becoming S 3 ft at 10 seconds and E 2 ft at 9 seconds. A chance of showers. Vsby 1 to 3 NM. .THU...E winds 10 to 15 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: S 6 ft at 10 seconds and E 3 ft at 9 seconds. A chance of showers. Vsby 1 to 3 NM in the morning. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 7 ft. Wave Detail: SE 6 ft at 9 seconds and E 5 ft at 9 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 5 ft at 9 seconds and S 5 ft at 9 seconds. .SAT THROUGH SUN NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: E 5 ft at 8 seconds and S 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. $$ ANZ255-160000- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 704 AM EDT Wed May 15 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH THURSDAY EVENING... .TODAY...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and E 2 ft at 8 seconds. A slight chance of showers. Vsby 1 NM or less this morning. .TONIGHT...SE winds 5 to 10 kt, becoming E 15 to 20 kt with gusts up to 25 kt after midnight. Seas 2 to 3 ft, building to 4 to 6 ft after midnight. Wave Detail: S 2 ft at 5 seconds and E 2 ft at 8 seconds, becoming S 5 ft at 10 seconds and E 3 ft at 8 seconds. A chance of showers in the evening, then showers likely after midnight. Vsby 1 to 3 NM. .THU...E winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 8 ft. Wave Detail: S 7 ft at 10 seconds and E 4 ft at 6 seconds. Showers likely, mainly in the morning with vsby 1 to 3 NM. .THU NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: SE 7 ft at 9 seconds and E 6 ft at 9 seconds. A chance of showers. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 8 seconds and S 2 ft at 9 seconds. .SAT AND SAT NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and S 1 foot at 8 seconds. .SUN...NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. .SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-160000- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 704 AM EDT Wed May 15 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS EVENING THROUGH THURSDAY EVENING... .TODAY...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 2 ft at 8 seconds. A slight chance of showers this morning, then a chance of showers with isolated tstms this afternoon. Vsby 1 NM or less, increasing to 1 to 3 NM this afternoon. .TONIGHT...E winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 25 kt. Seas 2 to 4 ft, building to 5 to 8 ft after midnight. Wave Detail: S 3 ft at 12 seconds and SE 2 ft at 6 seconds, becoming S 6 ft at 10 seconds and E 4 ft at 8 seconds. Showers likely. Vsby 1 to 3 NM after midnight. .THU...NE winds around 20 kt with gusts up to 30 kt. Seas 7 to 9 ft. Wave Detail: S 8 ft at 10 seconds and E 4 ft at 6 seconds. Showers likely. Vsby 1 to 3 NM in the morning. .THU NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 8 seconds and SE 7 ft at 9 seconds. A chance of showers. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 8 seconds and S 2 ft at 9 seconds. .SAT AND SAT NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and S 1 foot at 8 seconds. .SUN AND SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 3 to 4 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. $$ ANZ232-160000- Nantucket Sound- 704 AM EDT Wed May 15 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM THURSDAY MORNING THROUGH THURSDAY EVENING... .TODAY...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E 1 foot at 8 seconds. A slight chance of showers. Vsby 1 NM or less this morning. .TONIGHT...SE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 4 ft. Wave Detail: E 2 ft at 7 seconds and S 2 ft at 11 seconds. A chance of showers in the evening, then showers likely after midnight. .THU...E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 4 seconds and S 2 ft at 10 seconds. Showers likely, mainly in the morning. .THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 5 seconds and S 2 ft at 9 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 4 seconds and S 1 foot at 9 seconds. .SAT THROUGH SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 6 seconds and S 1 foot at 8 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-160000- Vineyard Sound- 704 AM EDT Wed May 15 2024 .TODAY...S winds around 5 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at 8 seconds. A slight chance of showers. .TONIGHT...SE winds 5 to 10 kt, becoming E 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 4 ft. Wave Detail: S 3 ft at 11 seconds and S 1 foot at 4 seconds. A chance of showers in the evening, then showers likely after midnight. .THU...E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 3 ft at 10 seconds and E 2 ft at 4 seconds. Showers likely, mainly in the morning. .THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 9 seconds and NE 2 ft at 4 seconds. A chance of showers. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 4 seconds and S 2 ft at 9 seconds. .SAT AND SAT NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 2 ft at 4 seconds and S 1 foot at 8 seconds. .SUN AND SUN NIGHT...NE winds 10 to 15 kt. 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. $$ ANZ234-160000- Buzzards Bay- 704 AM EDT Wed May 15 2024 .TODAY...S winds around 5 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at 8 seconds. A slight chance of showers. .TONIGHT...SE winds around 5 kt, becoming E 10 to 15 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 2 ft at 11 seconds and S 1 foot at 4 seconds. A chance of showers in the evening, then showers likely after midnight. .THU...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: E 2 ft at 4 seconds and S 2 ft at 10 seconds. Showers likely, mainly in the morning. .THU NIGHT...NE winds 15 to 20 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 9 seconds and NE 2 ft at 3 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: NE 2 ft at 3 seconds and S 2 ft at 9 seconds. .SAT AND SAT NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. Wave Detail: NE 1 foot at 3 seconds and S 1 foot at 9 seconds. .SUN AND SUN NIGHT...NE winds 10 to 15 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-160000- Rhode Island Sound- 704 AM EDT Wed May 15 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY EVENING... .TODAY...S winds around 5 kt. Seas around 2 ft this morning, then 1 foot or less. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at 8 seconds, becoming S 1 foot at 4 seconds and SE 1 foot at 7 seconds. A slight chance of showers. Isolated tstms this afternoon. Vsby 1 to 3 NM this morning. .TONIGHT...E winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: SE 2 ft at 6 seconds and SE 1 foot at 12 seconds, becoming S 5 ft at 10 seconds and SE 1 foot at 4 seconds. A chance of showers in the evening, then showers likely after midnight with vsby 1 to 3 NM. .THU...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft at 10 seconds and E 2 ft at 7 seconds. Showers likely. Vsby 1 to 3 NM in the morning. .THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SE 6 ft at 9 seconds and NE 4 ft at 5 seconds. A chance of showers. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 7 seconds and S 4 ft at 8 seconds. .SAT AND SAT NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 1 foot at 9 seconds. .SUN AND SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 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. $$ ANZ237-160000- Block Island Sound- 704 AM EDT Wed May 15 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM LATE TONIGHT THROUGH THURSDAY EVENING... .TODAY...SE winds around 5 kt. Seas around 2 ft. Wave Detail: S 1 foot at 4 seconds and SE 1 foot at 8 seconds. A chance of showers. Patchy fog this morning with vsby 1 NM or less. .TONIGHT...E winds 5 to 10 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 3 ft, building to 3 to 5 ft after midnight. Wave Detail: SE 2 ft at 6 seconds and SE 2 ft at 12 seconds, becoming S 5 ft at 10 seconds and SE 2 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM after midnight. .THU...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: SE 7 ft at 9 seconds and E 3 ft at 5 seconds. Showers likely. Vsby 1 to 3 NM in the morning. .THU NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SE 6 ft at 9 seconds and E 5 ft at 8 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and S 3 ft at 9 seconds. .SAT AND SAT NIGHT...E winds around 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds and S 1 foot at 8 seconds. .SUN AND SUN NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-160000- Boston Harbor- 704 AM EDT Wed May 15 2024 .TODAY...S winds around 5 kt. Waves 1 foot or less. A slight chance of showers this morning. A chance of showers with isolated tstms this afternoon. .TONIGHT...SE winds around 5 kt. Waves 1 foot or less. A chance of showers after midnight. .THU...E winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .SAT AND SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt. Waves 2 to 3 ft, then 1 foot or less. .SUN AND SUN NIGHT...NE winds around 10 kt. Waves 1 foot or less. A chance of showers. Winds and waves 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. $$ ANZ236-160000- Narragansett Bay- 704 AM EDT Wed May 15 2024 .TODAY...S winds around 5 kt. Waves 1 foot or less. A slight chance of showers. Isolated tstms this afternoon. Patchy fog this morning with vsby 1 NM or less. .TONIGHT...E winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers in the evening, then showers likely after midnight with vsby 1 to 3 NM. .THU...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Showers likely. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .SAT AND SAT NIGHT...NE winds 5 to 10 kt. Waves 2 to 3 ft. .SUN AND SUN NIGHT...NE winds around 10 kt. Waves 2 to 3 ft. A chance of showers. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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