Coastal Waters Forecast
Issued by NWS Boston, MA

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899 FZUS51 KBOX 180516 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 116 AM EDT Sun Apr 18 2021 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-181800- 116 AM EDT Sun Apr 18 2021 .Synopsis for Massachusetts and Rhode Island coastal waters... Modest northwesterly winds fall below 10 knots overnight as exiting low pressure continues to make its way over the Atlantic waters. Weak high pressure and drier conditions build into southern New England early next week before another low-pressure system brings the potential for rain and gusty winds by mid-week. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo $$ ANZ250-181800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 116 AM EDT Sun Apr 18 2021 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .REST OF TONIGHT...NW winds 5 to 10 kt with gusts up to 20 kt. Seas 4 to 5 ft. .SUN...NW winds 5 to 10 kt, becoming SW in the afternoon. Seas 3 to 4 ft. .SUN NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas 2 to 3 ft. .MON...W winds around 5 kt, becoming S in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds around 10 kt. Seas around 2 ft. .TUE AND TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of showers. .THU AND THU NIGHT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-181800- Massachusetts Bay and Ipswich Bay- 116 AM EDT Sun Apr 18 2021 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...NW winds 5 to 10 kt. Seas 3 to 5 ft. .SUN...NW winds around 5 kt, becoming SE in the afternoon. Seas 2 to 4 ft. .SUN NIGHT...SW winds around 5 kt. Seas 2 to 3 ft. .MON...W winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED AND WED NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .THU AND THU NIGHT...W winds 15 to 20 kt with gusts up to 35 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. $$ ANZ231-181800- Cape Cod Bay- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. .SUN...NW winds around 5 kt. Seas 2 to 3 ft. .SUN NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .MON...SW winds 5 to 10 kt. Seas 1 foot or less. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .THU AND THU NIGHT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-181800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 116 AM EDT Sun Apr 18 2021 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .REST OF TONIGHT...NW winds around 10 kt with gusts up to 20 kt. Seas 4 to 5 ft. .SUN...W winds 5 to 10 kt. Seas 3 to 5 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 4 ft. .MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of showers. .THU...W winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. .THU NIGHT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 5 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. $$ ANZ255-181800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 116 AM EDT Sun Apr 18 2021 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 8 AM EDT THIS MORNING... .REST OF TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft. .SUN...W winds 5 to 10 kt. Gusts up to 20 kt in the morning. Seas 2 to 4 ft. .SUN NIGHT...W winds around 10 kt. Seas 2 to 4 ft. .MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. A chance of showers. .THU AND THU NIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-181800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. .SUN...NW winds 5 to 10 kt, becoming W in the afternoon. Seas 2 to 4 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 4 ft. .MON...SW winds 5 to 10 kt. Seas 2 to 3 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 7 ft. A chance of showers. .THU AND THU NIGHT...W winds 25 to 30 kt with gusts up to 40 kt. Seas 5 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. $$ ANZ232-181800- Nantucket Sound- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. .SUN...NW winds 5 to 10 kt, becoming W in the afternoon. Seas around 2 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. .MON...SW winds 5 to 10 kt. Seas around 2 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. .THU AND THU NIGHT...W winds 25 to 30 kt, diminishing to 20 to 25 kt. Gusts up to 40 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-181800- Vineyard Sound- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds around 5 kt. Seas around 2 ft. .SUN...W winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. .MON...W winds around 5 kt, becoming SW in the afternoon. Seas around 2 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED AND WED NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .THU AND THU NIGHT...W winds 20 to 25 kt with gusts up to 35 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. $$ ANZ234-181800- Buzzards Bay- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds around 5 kt. Seas around 2 ft. .SUN...W winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas around 2 ft. .MON...SW winds 5 to 10 kt. Seas 1 foot or less. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED AND WED NIGHT...S winds 10 to 15 kt, becoming SW. Gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .THU AND THU NIGHT...W winds 20 to 25 kt with gusts up to 35 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-181800- Rhode Island Sound- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds 5 to 10 kt. Seas around 2 ft. .SUN...NW winds 5 to 10 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. .MON...W winds 5 to 10 kt, becoming SW 10 to 15 kt in the afternoon. Seas around 2 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. .THU AND THU NIGHT...W winds 25 to 30 kt, diminishing to 20 to 25 kt. Gusts up to 40 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. $$ ANZ237-181800- Block Island Sound- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds around 5 kt. Seas around 2 ft. .SUN...NW winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .SUN NIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. .MON...SW winds 5 to 10 kt. Seas around 2 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .WED...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. .THU AND THU NIGHT...W winds 20 to 25 kt with gusts up to 40 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-181800- Boston Harbor- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...NW winds around 5 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .SUN...NW winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .SUN NIGHT...W winds around 5 kt. Waves 1 foot or less. .MON...SW winds 5 to 10 kt. Waves 1 foot or less. .MON NIGHT THROUGH TUE NIGHT...SW winds 5 to 10 kt with gusts up to 20 kt. Waves 1 foot or less. .WED...S winds 5 to 10 kt with gusts up to 25 kt. Waves around 2 ft. A chance of showers. .WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Waves around 2 ft. Showers likely with a chance of tstms. .THU AND THU NIGHT...W winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft. 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. $$ ANZ236-181800- Narragansett Bay- 116 AM EDT Sun Apr 18 2021 .REST OF TONIGHT...W winds around 5 kt. Waves 1 foot or less. .SUN...W winds 5 to 10 kt. Waves around 2 ft. .SUN NIGHT...W winds around 5 kt. Waves around 2 ft. .MON...SW winds 5 to 10 kt. Waves around 2 ft. .MON NIGHT THROUGH TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .WED AND WED NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt. Gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers. .THU AND THU NIGHT...W winds 20 to 25 kt, diminishing to 15 to 20 kt. Gusts up to 35 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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

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