Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 200516 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 116 AM EDT Sun May 20 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-201800- 116 AM EDT Sun May 20 2018 .Synopsis for Massachusetts and Rhode Island coastal waters... A warm front will lift north of the waters overnight, followed by a cold front moving through from west to east Sun afternoon. Both fronts will offer widely scattered showers with possibly a few rumbles of thunder. Fair weather high pressure will bring dry weather across the waters Mon through most of Tue. Rain chances increase Tue night into Wed morning as low pressure lifts overhead. Dry weather returns Wed and Thu as high pressure begins building east over New England. 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. $$ ANZ250-201800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Areas of dense fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Patchy fog. A chance of showers and periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. .MON...NW winds around 5 kt, becoming SW 10 to 15 kt in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 10 to 15 kt, becoming W around 5 kt after midnight. Seas 2 to 3 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM. .WED...SW winds 5 to 10 kt. Seas around 2 ft. .WED NIGHT...N winds 5 to 10 kt. Seas around 2 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-201800- Massachusetts Bay and Ipswich Bay- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .REST OF TONIGHT...SW winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 4 ft. Areas of fog. Periods of drizzle with a chance of showers. Vsby 1 NM or less. .SUN...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .MON...NW winds around 5 kt, becoming S in the afternoon. Seas around 2 ft. .MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Seas 1 foot or less. .TUE...SE winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. Vsby 1 to 3 NM. .WED...SW winds around 5 kt. Seas 1 foot or less. .WED NIGHT...N winds 5 to 10 kt. Seas 1 foot or less. .THU...E winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 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. $$ ANZ231-201800- Cape Cod Bay- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Areas of dense fog. Periods of heavy drizzle and showers likely. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Patchy fog. A chance of showers and periods of drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. A chance of showers. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 1 foot or less. .MON NIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...SW winds around 5 kt. Seas 1 foot or less. .WED NIGHT...NW winds 5 to 10 kt. Seas 1 foot or less. .THU...E winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-201800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Areas of dense fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. Areas of fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt after midnight. Seas 3 to 5 ft. A chance of showers. .MON...N winds around 5 kt, becoming W in the afternoon. Seas 2 to 4 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 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. $$ ANZ255-201800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 4 to 6 ft. Areas of dense fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Areas of fog. Periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 7 ft. .MON...N winds 5 to 10 kt, becoming W in the afternoon. Seas 3 to 5 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM. .WED...W winds 5 to 10 kt. Seas 2 to 4 ft. .WED NIGHT...NW winds around 10 kt. Seas 2 to 4 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-201800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Areas of dense fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Areas of dense fog. Periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 7 ft. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 3 to 5 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 3 to 4 ft. .TUE...S winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. .TUE NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .WED...W winds 5 to 10 kt. Seas 2 to 4 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 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. $$ ANZ232-201800- Nantucket Sound- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 4 ft. Areas of dense fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Areas of dense fog. Periods of heavy drizzle with a chance of showers. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N around 5 kt after midnight. Seas 2 to 4 ft. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...SW winds 5 to 10 kt. Seas around 2 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. .THU...E winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-201800- Vineyard Sound- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 3 ft. Areas of dense fog. Periods of heavy drizzle and showers likely. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt. Gusts up to 30 kt in the morning. Seas 2 to 4 ft. Areas of dense fog. Periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt, becoming N around 5 kt after midnight. Seas 2 to 4 ft. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds 5 to 10 kt. Seas around 2 ft. .WED NIGHT...NW winds around 10 kt. Seas around 2 ft. .THU...E winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds around 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. $$ ANZ234-201800- Buzzards Bay- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 3 ft. Areas of dense fog. Periods of heavy drizzle and showers likely. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt. Gusts up to 30 kt in the morning. Seas 2 to 4 ft. Areas of dense fog. Showers likely with periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt, becoming N around 5 kt after midnight. Seas 2 to 3 ft. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas around 2 ft. .TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. .THU...E winds 5 to 10 kt. Seas 1 foot or less. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-201800- Rhode Island Sound- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Areas of dense fog. Periods of heavy drizzle and showers likely. Vsby 1 NM or less. .SUN...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. Areas of dense fog. Periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 6 ft. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 3 to 5 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. .TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 NM. .WED...W winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. .THU...SE winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds around 10 kt. Seas 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. $$ ANZ237-201800- Block Island Sound- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Areas of dense fog. Periods of heavy drizzle and showers likely. Vsby 1 NM or less. .SUN...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Areas of dense fog. Periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas 3 to 5 ft. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 4 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .TUE...S winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. A chance of showers. Vsby 1 to 3 NM. .TUE NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 NM. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...SE winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-201800- Boston Harbor- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .REST OF TONIGHT...SW winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to 3 ft. Patchy fog. A chance of showers and periods of drizzle. Vsby 1 NM or less. .SUN...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SUN NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. .MON...NW winds around 5 kt, becoming SW in the afternoon. Waves 1 foot or less. .MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Waves 1 foot or less. .TUE...E winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less. .TUE NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds around 5 kt. Waves 1 foot or less. .WED NIGHT...N winds around 5 kt. Waves 1 foot or less. .THU...SE winds around 5 kt. Waves 1 foot or less. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. 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. $$ ANZ236-201800- Narragansett Bay- 116 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .REST OF TONIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 4 ft. Areas of fog. Periods of drizzle and showers likely. Vsby 1 NM or less. .SUN...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 4 ft. Patchy fog. A chance of showers and periods of heavy drizzle. Vsby 1 NM or less. .SUN NIGHT...NW winds 5 to 10 kt. Waves 2 to 4 ft. A chance of showers. .MON...N winds around 5 kt, becoming SW in the afternoon. Waves 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, becoming W after midnight. Waves around 2 ft. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Waves around 2 ft. .TUE NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves around 2 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .WED...W winds around 5 kt. Waves around 2 ft. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...NW winds around 5 kt. Waves around 2 ft. .THU...S winds 5 to 10 kt. Waves around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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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