Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 201116 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 716 AM EDT Sun May 20 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-210000- 716 AM EDT Sun May 20 2018 .Synopsis for Massachusetts and Rhode Island coastal waters... A cold front will cross the waters late this afternoon and evening. Another round of showers likely later today, and possibly a few rumbles of thunder. Fair weather high pres will bring dry weather across the waters Mon through most of Tue. Rain chances increase Tue night into Wed morning as low pres passes overhead. Dry weather returns Wed and Thu as another high pres begins building E 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. $$ ANZ250-210000- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... .TODAY...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 4 to 6 ft. Areas of fog. Isolated tstms. A slight chance of showers this morning, then showers likely this afternoon. Vsby 1 NM or less. .TONIGHT...NW winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. Areas of fog. Vsby 1 NM or less. .MON...NW winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .TUE...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. A chance of showers. .WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-210000- Massachusetts Bay and Ipswich Bay- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .TODAY...SW winds 10 to 15 kt, becoming W 5 to 10 kt this afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Areas of fog. Isolated tstms. A slight chance of showers this morning, then showers this afternoon. Vsby 1 NM or less. .TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Areas of fog. Vsby 1 NM or less. .MON...NW winds around 5 kt, becoming SW in the afternoon. Seas around 2 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 10 to 15 kt in the afternoon. Seas 2 to 3 ft. .TUE NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. .WED...SW winds around 5 kt. Seas 1 foot or less. .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 5 to 10 kt. Seas 2 to 3 ft. 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. $$ ANZ231-210000- Cape Cod Bay- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Areas of fog. Isolated tstms. A slight chance of showers this morning, then a chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming N after midnight. Seas around 2 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 1 foot or less. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 1 foot or less. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 1 foot or less. .TUE NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...SW winds 5 to 10 kt. Seas 1 foot or less. .WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. .THU...NE winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-210000- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. Areas of fog. Isolated tstms. Showers this morning, then a slight chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt after midnight. Seas 3 to 5 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds 5 to 10 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. .WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. .THU...NE winds 5 to 10 kt. Seas 2 to 4 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. 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. $$ ANZ255-210000- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Areas of fog. A chance of showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 7 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds 5 to 10 kt, becoming W in the afternoon. Seas 3 to 5 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. A chance of showers. .WED...W winds 5 to 10 kt. Seas 2 to 4 ft. .WED NIGHT...NW winds around 10 kt. Seas 2 to 4 ft. .THU...NE winds 5 to 10 kt. Seas 2 to 4 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-210000- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Areas of fog. A chance of showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 7 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds 5 to 10 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 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. A chance of showers. .WED...W winds 5 to 10 kt. Seas 3 to 4 ft. .WED NIGHT...NW winds 10 to 15 kt. Seas 3 to 4 ft. .THU...E winds 5 to 10 kt. Seas 2 to 4 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. 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. $$ ANZ232-210000- Nantucket Sound- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Areas of fog. A chance of showers with isolated tstms. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt after midnight. Seas 2 to 4 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...NE winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-210000- Vineyard Sound- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... .TODAY...SW winds around 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Areas of fog. A slight chance of tstms. A slight chance of showers this morning, then showers likely this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming N after midnight. Seas 2 to 4 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .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 2 to 3 ft. .TUE...S winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds around 10 kt. Seas 2 to 3 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds around 10 kt. Seas around 2 ft. 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. $$ ANZ234-210000- Buzzards Bay- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS EVENING... .TODAY...SW winds 15 to 20 kt, diminishing to 10 to 15 kt this afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Areas of fog. Isolated tstms. A slight chance of showers this morning, then showers likely this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming N after midnight. Seas 2 to 3 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...W winds 5 to 10 kt. Seas around 2 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. .THU...NE winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-210000- Rhode Island Sound- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 7 ft. Areas of fog. A slight chance of tstms. A slight chance of showers this morning, then showers likely this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 6 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .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 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. A chance of showers. .WED...W winds 5 to 10 kt. Seas 2 to 3 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 5 to 10 kt. Seas 2 to 3 ft. 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. $$ ANZ237-210000- Block Island Sound- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Areas of dense fog this morning. Areas of fog this afternoon. A slight chance of tstms. A slight chance of showers this morning, then showers likely this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming N after midnight. Seas 3 to 5 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 4 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 4 ft. .TUE...S winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. A chance of showers. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-210000- Boston Harbor- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .TODAY...SW winds 10 to 15 kt, becoming W 5 to 10 kt this afternoon. Gusts up to 25 kt. Waves around 2 ft. A slight chance of showers with isolated tstms this morning, then showers with a chance of tstms this afternoon. Areas of fog this afternoon. .TONIGHT...NW winds 5 to 10 kt. Waves 1 foot or less. .MON...NW winds around 5 kt, becoming SW in the afternoon. Waves 1 foot or less. .MON NIGHT...SW winds around 5 kt. Waves 1 foot or less. .TUE...S winds 5 to 10 kt. Waves 1 foot or less. .TUE NIGHT...S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Waves 1 foot or less. A chance of showers. .WED...W winds around 5 kt. Waves 1 foot or less. .WED NIGHT...NW winds around 5 kt. Waves 1 foot or less. .THU...E winds around 5 kt. Waves 1 foot or less. .THU NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. 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. $$ ANZ236-210000- Narragansett Bay- 716 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 4 ft. Areas of fog. Isolated tstms. A slight chance of showers this morning, then showers likely this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt, becoming N after midnight. Waves 2 to 4 ft. Areas of fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Waves 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Waves 2 to 3 ft. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Waves around 2 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Waves around 2 ft. A chance of showers. .WED...W winds 5 to 10 kt. Waves 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Waves 2 to 3 ft. .THU...E winds around 5 kt. Waves around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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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