Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 220212 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 1012 PM EDT Mon May 21 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-221515- 1012 PM EDT Mon May 21 2018 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres will build SE of the waters overnight, then head farther E Tue. Low pres approaches the waters from the SW late Tue, lifting NE Tue night. High pres builds E over New England Wed and Thu, then SE of the waters Fri and Sat. For information on possible hazardous weather beyond the 24-36 hour forecast period, please visit www.weather.gov/boston and follow the Current Hazards link above the map on the left. $$ ANZ250-221515- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft. .TUE...SE winds around 5 kt, becoming S in the afternoon. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Patchy fog. Showers likely. Vsby 1 NM or less. .WED...NW winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds 5 to 10 kt, becoming NE 10 to 15 kt with gusts up to 25 kt after midnight. Seas 2 to 3 ft. .THU...NE winds 5 to 10 kt, becoming SE with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. .SAT...SW winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers. .SAT NIGHT...NE winds 5 to 10 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-221515- Massachusetts Bay and Ipswich Bay- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...W winds 5 to 10 kt. Seas 2 to 3 ft. .TUE...W winds around 5 kt, becoming S in the afternoon. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Showers likely. Vsby 1 NM or less. .WED...NW winds around 5 kt, becoming E in the afternoon. Seas around 2 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...SW winds 5 to 10 kt, becoming NE 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. .THU...NE winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. .FRI...SW winds around 10 kt. Seas 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. .SAT...SW winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. .SAT NIGHT...E winds 5 to 10 kt. Seas around 2 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. $$ ANZ231-221515- Cape Cod Bay- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas 1 to 2 ft. .TUE...SW winds around 5 kt, becoming S in the afternoon. Seas 1 to 2 ft. A chance of showers. .TUE NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 1 to 2 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...NW winds around 5 kt, becoming NE in the afternoon. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds around 5 kt, becoming N after midnight. Seas around 2 ft. Patchy fog. Vsby 1 to 3 NM. .THU...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. .THU NIGHT...S winds 5 to 10 kt with gusts up to 20 kt, becoming SW 10 to 15 kt after midnight. Seas around 2 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .SAT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-221515- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...NW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...W winds around 5 kt, becoming N with gusts up to 20 kt after midnight. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 NM. .THU...NE winds 10 to 15 kt with gusts up to 20 kt, becoming E 5 to 10 kt in the afternoon. Seas 2 to 4 ft. .THU NIGHT...S winds 5 to 10 kt with gusts up to 20 kt, becoming SW 10 to 15 kt after midnight. Seas 2 to 4 ft. .FRI...SW winds 15 to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 15 to 20 kt. Seas 5 to 8 ft. .SAT...SW winds 10 to 15 kt. Seas 4 to 7 ft. .SAT NIGHT...SE winds 5 to 10 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. $$ ANZ255-221515- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...NW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 NM or less. .WED NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 NM. .THU...NE winds 10 to 15 kt with gusts up to 20 kt, becoming SE 5 to 10 kt in the afternoon. Seas 2 to 4 ft. .THU NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt after midnight. Seas 3 to 4 ft. .FRI...SW winds 15 to 20 kt. Seas 4 to 6 ft. .FRI NIGHT...SW winds 15 to 20 kt. Seas 6 to 9 ft. .SAT...SW winds 10 to 15 kt. Seas 5 to 8 ft. .SAT NIGHT...S winds around 10 kt. Seas 4 to 7 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-221515- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. .TUE...SW winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Showers. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 3 to 4 ft. .THU...NE winds 10 to 15 kt with gusts up to 20 kt, becoming SE in the afternoon. Seas 2 to 4 ft. .THU NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt after midnight. Seas 3 to 4 ft. .FRI...SW winds 15 to 20 kt. Seas 4 to 6 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. .SAT...SW winds 10 to 15 kt. Seas 5 to 8 ft. .SAT NIGHT...SE winds 10 to 15 kt. Seas 4 to 7 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. $$ ANZ232-221515- Nantucket Sound- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas 1 to 2 ft. A chance of showers. .TUE NIGHT...S winds 5 to 10 kt. Seas 1 to 2 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...W winds 5 to 10 kt. Seas 1 to 2 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds around 5 kt, becoming N after midnight. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 NM. .THU...NE winds 5 to 10 kt with gusts up to 20 kt, becoming S in the afternoon. Seas 2 to 3 ft. .THU NIGHT...S winds 5 to 10 kt, becoming SW 10 to 15 kt after midnight. Seas 2 to 3 ft. .FRI...SW winds 15 to 20 kt. Seas 2 to 4 ft. .FRI NIGHT...SW winds 15 to 20 kt. Seas 3 to 5 ft. .SAT...SW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. .SAT NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-221515- Vineyard Sound- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas 1 to 2 ft. .TUE...S winds 5 to 10 kt. Seas 1 to 2 ft. Showers likely. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 to 2 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...W winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. .THU...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. .THU NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .SAT...SW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. .SAT NIGHT...S winds 5 to 10 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. $$ ANZ234-221515- Buzzards Bay- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas around 2 ft. Showers likely. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...W winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. .THU...NE winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .SAT...SW winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers. .SAT NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-221515- Rhode Island Sound- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas around 3 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. Showers. .TUE NIGHT...SE winds 5 to 10 kt with gusts up to 20 kt, becoming SW after midnight. Seas 2 to 3 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .WED NIGHT...SW winds 5 to 10 kt, becoming NW 10 to 15 kt after midnight. Seas 2 to 4 ft. .THU...NE winds 10 to 15 kt, becoming SE in the afternoon. Seas 2 to 4 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 3 ft. .FRI...SW winds 15 to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 15 to 20 kt. Seas 5 to 8 ft. .SAT...SW winds 10 to 15 kt. Seas 4 to 7 ft. .SAT NIGHT...SE winds 5 to 10 kt. Seas 3 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. $$ ANZ237-221515- Block Island Sound- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. Showers. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 4 ft. .THU...NE winds 5 to 10 kt, becoming SE 10 to 15 kt in the afternoon. Seas 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 7 ft. .SAT...SW winds 5 to 10 kt. Seas 4 to 6 ft. .SAT NIGHT...SE winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-221515- Boston Harbor- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...W winds 5 to 10 kt. Waves 1 foot or less. .TUE...W winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less. Showers likely. .TUE NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. Showers likely. Vsby 1 NM or less. .WED...NW winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...W winds 5 to 10 kt, becoming NE with gusts up to 20 kt after midnight. Waves around 2 ft. .THU...NE winds 5 to 10 kt, becoming SE in the afternoon. Waves 1 foot or less. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .FRI...W winds 5 to 10 kt. Waves 1 foot or less. .FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .SAT...SW winds around 5 kt. Waves 1 foot or less. A chance of showers. .SAT NIGHT...E winds around 5 kt. Waves 1 foot or less. 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. $$ ANZ236-221515- Narragansett Bay- 1012 PM EDT Mon May 21 2018 .OVERNIGHT...SW winds 5 to 10 kt. Waves 2 to 3 ft. .TUE...S winds 5 to 10 kt. Waves around 2 ft. Showers. .TUE NIGHT...SE winds around 5 kt, becoming SW after midnight. Waves around 2 ft. Patchy fog. Showers. Vsby 1 NM or less. .WED...NW winds around 5 kt, becoming SW in the afternoon. Waves around 2 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...SW winds 5 to 10 kt, becoming N after midnight. Waves 2 to 3 ft. .THU...NE winds 5 to 10 kt, becoming SE in the afternoon. Waves 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Waves 2 to 3 ft. .FRI...SW winds 10 to 15 kt. Waves 2 to 4 ft. .FRI NIGHT...SW winds 10 to 15 kt. Waves 2 to 4 ft, except 4 to 7 ft at the bay entrance. .SAT...SW winds 5 to 10 kt. Waves 2 to 4 ft. A chance of showers. .SAT NIGHT...SE winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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

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