Coastal Waters Forecast
Issued by NWS Boston, MA

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000 FZUS51 KBOX 201922 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 322 PM EDT Thu Sep 20 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-210830- 322 PM 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, which will shift east toward Nova Scotia on Tue. 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. $$ ANZ250-210830- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING... ...GALE WATCH IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Seas 4 to 6 ft. .FRI...SE winds 5 to 10 kt, becoming S 15 to 20 kt with gusts up to 25 kt in the afternoon. Seas 4 to 6 ft. .FRI NIGHT...S winds 15 to 20 kt, becoming SW 20 to 25 kt after midnight. Gusts up to 35 kt. Seas 5 to 7 ft. A chance of showers. Vsby 1 to 3 NM. .SAT...W winds 20 to 25 kt with gusts up to 30 kt, becoming N 15 to 20 kt in the afternoon. Seas 4 to 6 ft. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. .SUN...N winds 5 to 10 kt. Seas 2 to 3 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 15 to 20 kt with gusts up to 25 kt after midnight. Seas 2 to 4 ft. .MON...NE winds 20 to 25 kt. Seas 4 to 6 ft. .MON NIGHT...E winds 15 to 20 kt. Seas 3 to 5 ft. .TUE...SE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. A chance of showers. .TUE NIGHT...S winds 25 to 30 kt. Seas 4 to 7 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-210830- Massachusetts Bay and Ipswich Bay- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING... ...GALE WATCH IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Seas 3 to 5 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 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 35 kt. Seas 3 to 5 ft. A chance of showers. 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 2 to 4 ft. A chance of showers. .SAT NIGHT...NE winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Seas 2 to 3 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 4 ft. .MON...NE winds 15 to 20 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .TUE...SE winds 15 to 20 kt. Seas 2 to 4 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 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. $$ ANZ231-210830- Cape Cod Bay- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING... ...GALE WATCH IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 35 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N in the afternoon. Seas 2 to 4 ft. A chance of showers. .SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. .SUN...N winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. .MON...NE winds 15 to 20 kt. Seas 2 to 4 ft. .MON NIGHT...E winds 15 to 20 kt. Seas 2 to 4 ft. .TUE...E winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-210830- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH FRIDAY EVENING... ...GALE WATCH IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY 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...SW winds 15 to 20 kt with gusts up to 35 kt. Seas 4 to 7 ft. .SAT...W winds 20 to 25 kt, becoming N 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 4 to 7 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...N winds 5 to 10 kt. Seas 2 to 3 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 15 to 20 kt after midnight. Seas 3 to 5 ft. .MON...NE winds 20 to 25 kt. Seas 4 to 7 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. .TUE...E winds around 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. .TUE NIGHT...SE winds 20 to 25 kt. Seas 5 to 8 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. $$ ANZ255-210830- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .TONIGHT...NE winds 10 to 15 kt, becoming E 5 to 10 kt after midnight. Seas 3 to 5 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 25 kt in the afternoon. Seas 2 to 4 ft. .FRI NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 4 to 7 ft. .SAT...W winds 20 to 25 kt with gusts up to 30 kt, becoming N 15 to 20 kt in the afternoon. Seas 4 to 6 ft. .SAT NIGHT...NE winds 15 to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 4 ft. .SUN...NE winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. .SUN NIGHT...NE winds around 10 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 4 ft. .MON...NE winds 20 to 25 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 20 to 25 kt. Seas 4 to 6 ft. .TUE...E winds 20 to 25 kt. Seas 4 to 6 ft. .TUE NIGHT...SE winds 20 to 25 kt. Seas 4 to 7 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-210830- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .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 25 kt in the afternoon. Seas 2 to 4 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 7 ft. .SAT...W winds 20 to 25 kt with gusts up to 30 kt, becoming N 15 to 20 kt in the afternoon. Seas 4 to 6 ft. .SAT NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 4 ft. .SUN...NE winds 5 to 10 kt. Seas 2 to 3 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 15 to 20 kt after midnight. Seas 2 to 4 ft. .MON...NE winds 20 to 25 kt. Seas 4 to 6 ft. .MON NIGHT...E winds 20 to 25 kt. Seas 5 to 7 ft. .TUE...E winds 20 to 25 kt. Seas 5 to 7 ft. A chance of showers. .TUE NIGHT...S winds 20 to 25 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. $$ ANZ232-210830- Nantucket Sound- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .FRI NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N in the afternoon. Seas 2 to 4 ft. A chance of showers. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. .MON...NE winds 20 to 25 kt. Seas 2 to 4 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .TUE...E winds 20 to 25 kt. Seas 2 to 4 ft. A chance of showers. .TUE NIGHT...SE winds 20 to 25 kt. Seas 2 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-210830- Vineyard Sound- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY 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...S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 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 2 to 4 ft. .SAT NIGHT...NE winds 10 to 15 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 10 to 15 kt. Seas around 2 ft. .MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...E winds 15 to 20 kt. Seas 2 to 3 ft. .TUE...E winds around 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds around 20 kt with gusts up to 25 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. $$ ANZ234-210830- Buzzards Bay- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Seas 1 foot or less. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. .FRI NIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. A chance of showers. .SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. .SUN...NE winds 5 to 10 kt. Seas 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Seas around 2 ft. .MON...NE winds 15 to 20 kt. Seas around 2 ft. .MON NIGHT...E winds 15 to 20 kt. Seas around 2 ft. .TUE...E winds 15 to 20 kt. Seas around 2 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-210830- Rhode Island Sound- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .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 3 ft. .FRI NIGHT...S winds 10 to 15 kt, becoming SW 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. A chance of showers. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N in the afternoon. Seas 3 to 5 ft. A chance of showers. .SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. .MON...NE winds 20 to 25 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .TUE...E winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 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. $$ ANZ237-210830- Block Island Sound- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt, increasing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 3 to 5 ft. .SAT...W winds 15 to 20 kt with gusts up to 30 kt, becoming N 10 to 15 kt in the afternoon. Seas 3 to 5 ft. A chance of showers. .SAT NIGHT...NE winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. .SUN...NE winds 5 to 10 kt. Seas around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. .MON...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .TUE...E winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-210830- Boston Harbor- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves around 2 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 30 kt. Waves around 2 ft. A chance of showers. Vsby 1 to 3 NM. .SAT...NW winds 10 to 15 kt. Gusts up to 25 kt in the morning. Waves around 2 ft. A chance of showers. .SAT NIGHT...N winds 5 to 10 kt. Waves 1 foot or less. .SUN...N winds around 5 kt. Waves 1 foot or less. .SUN NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. .MON...NE winds around 10 kt with gusts up to 20 kt. Waves 2 to 3 ft. .MON NIGHT...E winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. .TUE...SE winds around 10 kt. Waves 1 foot or less. A chance of showers. .TUE NIGHT...S winds 10 to 15 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. $$ ANZ236-210830- Narragansett Bay- 322 PM EDT Thu Sep 20 2018 ...SMALL CRAFT ADVISORY IN EFFECT FROM FRIDAY EVENING THROUGH SATURDAY MORNING... .TONIGHT...E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...SE winds 5 to 10 kt, becoming S 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 30 kt. Waves 2 to 4 ft. A chance of showers. .SAT...W winds 10 to 15 kt with gusts up to 25 kt, becoming N in the afternoon. Waves 2 to 4 ft. A chance of showers. .SAT NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. .SUN...NE winds 5 to 10 kt. Waves around 2 ft. .SUN NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. .MON...NE winds 15 to 20 kt. Waves 2 to 3 ft. .MON NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .TUE...E winds 15 to 20 kt. Waves 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt. Waves 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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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