Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 200821 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 421 AM EDT Sun May 20 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-202115- 421 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. $$ ANZ250-202115- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .TODAY...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 4 to 6 ft. Patchy fog. A chance of showers with isolated tstms this afternoon. Vsby 1 to 3 NM, decreasing to 1 NM or less this afternoon. .TONIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 NM or less. .MON...NW winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .TUE...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .TUE NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. A chance of showers. .WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-202115- Massachusetts Bay and Ipswich Bay- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Patchy fog. Showers likely with isolated tstms this afternoon. Vsby 1 to 3 NM. .TONIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Patchy 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. $$ ANZ231-202115- Cape Cod Bay- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 3 PM EDT THIS AFTERNOON... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Patchy fog. Showers with isolated tstms this morning, then a chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. Patchy fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 1 foot or less. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 1 foot or less. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 1 foot or less. .TUE NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...SW winds 5 to 10 kt. Seas 1 foot or less. .WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. .THU...NE winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-202115- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 421 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. Patchy fog. Showers with isolated tstms this morning. A 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. Patchy 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. $$ ANZ255-202115- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH MONDAY AFTERNOON... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Patchy fog. Showers with isolated tstms this morning. A slight chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt after midnight. Seas 4 to 7 ft. Patchy fog. Vsby 1 NM or less. .MON...N winds 5 to 10 kt, becoming W in the afternoon. Seas 3 to 5 ft. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .TUE...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. A chance of showers. .WED...W winds 5 to 10 kt. Seas 2 to 4 ft. .WED NIGHT...NW winds around 10 kt. Seas 2 to 4 ft. .THU...NE winds 5 to 10 kt. Seas 2 to 4 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-202115- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 421 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. Patchy fog. A chance of showers with isolated tstms this morning. 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 4 to 7 ft. Patchy fog. 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. $$ ANZ232-202115- Nantucket Sound- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Patchy fog. Showers likely with isolated tstms this morning, then a slight chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N 5 to 10 kt after midnight. Seas 2 to 4 ft. Patchy fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...SW winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. .THU...NE winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-202115- Vineyard Sound- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .TODAY...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Patchy fog. Showers likely with isolated tstms this morning, then a chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming N around 5 kt after midnight. Seas 2 to 4 ft. Patchy 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. $$ ANZ234-202115- Buzzards Bay- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS AFTERNOON... .TODAY...SW winds 10 to 15 kt with gusts up to 30 kt. Seas 2 to 4 ft. Patchy fog. Showers likely with a slight chance of tstms this morning, then a chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 10 to 15 kt, becoming N around 5 kt after midnight. Seas 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 1 foot or less. A chance of showers. .WED...W winds 5 to 10 kt. Seas around 2 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. .THU...NE winds 5 to 10 kt. Seas around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-202115- Rhode Island Sound- 421 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. Patchy fog. A chance of showers with isolated tstms this morning. A slight chance of showers 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. Patchy fog. 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. $$ ANZ237-202115- Block Island Sound- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH LATE TONIGHT... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Patchy fog. A slight chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt with gusts up to 20 kt, becoming N after midnight. Seas 3 to 5 ft. Patchy fog. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Seas 2 to 4 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 2 to 4 ft. .TUE...S winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas 2 to 3 ft. A chance of showers. .WED...W winds 5 to 10 kt. Seas 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. .THU...E winds 5 to 10 kt. Seas 2 to 3 ft. .THU NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-202115- Boston Harbor- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL NOON EDT TODAY... .TODAY...SW winds 10 to 15 kt, diminishing to 5 to 10 kt this afternoon. Gusts up to 25 kt. Waves around 2 ft. A chance of showers with isolated tstms this afternoon with vsby 1 to 3 NM. .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. $$ ANZ236-202115- Narragansett Bay- 421 AM EDT Sun May 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 4 ft. Patchy fog. A slight chance of showers. Isolated tstms this morning. Vsby 1 NM or less. .TONIGHT...W winds 5 to 10 kt, becoming N after midnight. Waves 2 to 4 ft. Patchy fog. Vsby 1 NM or less. .MON...N winds around 5 kt, becoming SW in the afternoon. Waves 2 to 3 ft. .MON NIGHT...SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Waves 2 to 3 ft. .TUE...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Waves around 2 ft. .TUE NIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Waves around 2 ft. A chance of showers. .WED...W winds 5 to 10 kt. Waves 2 to 3 ft. .WED NIGHT...NW winds 5 to 10 kt. Waves 2 to 3 ft. .THU...E winds around 5 kt. Waves around 2 ft. .THU NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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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