Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 200744 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 344 AM EDT Thu Sep 20 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-202015- 344 AM EDT Thu Sep 20 2018 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres over the Canadian maritimes builds south over the waters tonight, then moves east Fri. A cold front will sweep across the waters early Sat with pre-frontal S-SW winds approaching gale force Fri night. High pres will build east from the Great Lakes this weekend and be followed by a reinforcing high pres area from Ontario on Mon. 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. $$ ANZ250-202015- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 344 AM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY MORNING... .TODAY...NE winds 15 to 20 kt, diminishing to 10 to 15 kt this afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. A slight chance of showers this morning. .TONIGHT...E winds 5 to 10 kt. Seas 4 to 6 ft. .FRI...SE winds 10 to 15 kt, becoming S 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 4 to 7 ft. .FRI NIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after midnight. Gusts up to 35 kt. Seas 4 to 7 ft. A chance of showers. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. A chance of showers. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-202015- Massachusetts Bay and Ipswich Bay- 344 AM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THIS EVENING... .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Seas 3 to 5 ft. .TONIGHT...E winds 5 to 10 kt. Seas 3 to 5 ft. .FRI...S winds 5 to 10 kt, increasing to 15 to 20 kt with gusts up to 25 kt in the afternoon. Seas 4 to 6 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. .SAT...W winds 10 to 15 kt, becoming N 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. .SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. .MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .MON NIGHT...E 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. $$ ANZ231-202015- Cape Cod Bay- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A slight chance of showers. .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 2 to 4 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. .SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-202015- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 344 AM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY MORNING... .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. A slight chance of showers this morning. .TONIGHT...NE winds 10 to 15 kt, becoming E 5 to 10 kt after midnight. Seas 4 to 6 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 4 to 6 ft. .FRI NIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after midnight. Gusts up to 35 kt. Seas 4 to 6 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. .SAT NIGHT...NE winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt. Seas 2 to 4 ft. .MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 4 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. $$ ANZ255-202015- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 344 AM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM EDT THIS MORNING... .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A slight chance of showers this morning. .TONIGHT...NE winds 10 to 15 kt, becoming E 5 to 10 kt after midnight. Seas 3 to 5 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. .FRI NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Patchy fog. Vsby 1 to 3 NM. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Patchy fog. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. .SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. .SUN NIGHT...NE winds around 10 kt with gusts up to 20 kt. Seas 2 to 4 ft. .MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-202015- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 344 AM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 10 AM EDT THIS MORNING... .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 4 to 6 ft. Patchy fog. .SAT NIGHT...E winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .MON...E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 30 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. $$ ANZ232-202015- Nantucket Sound- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Seas 2 to 3 ft. A slight chance of showers this morning. .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. .MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-202015- Vineyard Sound- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Seas around 2 ft. A slight chance of showers this morning. .TONIGHT...E winds 5 to 10 kt. Seas 1 foot or less. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. .MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .MON NIGHT...E winds around 15 kt with gusts up to 25 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. $$ ANZ234-202015- Buzzards Bay- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Seas around 2 ft. .TONIGHT...E winds 5 to 10 kt. Seas 1 foot or less. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N around 10 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. .SAT NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. .MON...NE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-202015- Rhode Island Sound- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .TONIGHT...NE winds 10 to 15 kt, becoming E 5 to 10 kt after midnight. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. .FRI NIGHT...SW winds 15 to 20 kt, increasing to 20 to 25 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. .SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. .MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 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. $$ ANZ237-202015- Block Island Sound- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Seas 2 to 4 ft. .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. .FRI NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 5 to 10 kt in the afternoon. Seas 2 to 4 ft. Patchy fog. .SAT NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. .MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-202015- Boston Harbor- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .TONIGHT...E winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 25 kt in the afternoon. Waves around 2 ft. .FRI NIGHT...SW winds around 15 kt with gusts up to 30 kt. Waves around 2 ft, except 3 to 5 ft at the outer harbor entrance. A chance of showers. .SAT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt in the afternoon. Waves around 2 ft. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. .SUN...NE winds around 5 kt. Waves 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. .MON...NE winds 5 to 10 kt. Waves 1 foot or less. .MON NIGHT...E 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. $$ ANZ236-202015- Narragansett Bay- 344 AM EDT Thu Sep 20 2018 .TODAY...NE winds 10 to 15 kt. Gusts up to 20 kt this morning. Waves around 2 ft. .TONIGHT...E winds 5 to 10 kt. Waves around 2 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 kt in the afternoon. Waves 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 30 kt. Waves 2 to 3 ft. .SAT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N 5 to 10 kt in the afternoon. Waves 2 to 3 ft. .SAT NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. .SUN...NE winds 5 to 10 kt. Waves 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. .MON...NE winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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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