Coastal Waters Forecast
Issued by NWS Boston, MA

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548 FZUS51 KBOX 232316 CWFBOX Coastal Waters Forecast National Weather Service Boston/Norton MA 716 PM EDT Mon Apr 23 2018 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-241200- 716 PM EDT Mon Apr 23 2018 .Synopsis for Massachusetts and Rhode Island coastal waters... High pressure over the waters will shift east tonight and Tuesday. Low pressure will move up the eastern seaboard Tuesday night and Wednesday bringing fog and showers, then crossing the waters by Thursday morning. Another storm will be moving up along the coast Friday night. High pressure will begin to build in from the west Saturday and Sunday. 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. $$ ANZ250-241200- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. .TUE...S winds 5 to 10 kt, increasing to 15 to 20 kt in the afternoon. Seas 2 to 3 ft. .TUE NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. A chance of rain. .WED...SE winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 3 to 5 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt. Gusts up to 35 kt, decreasing to 25 kt after midnight. Seas 5 to 8 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 8 ft. Patchy fog. A chance of showers. .THU NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 4 to 7 ft. .FRI...SW winds around 10 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. .SAT...S winds around 10 kt. Seas 2 to 4 ft. .SAT NIGHT...W winds 10 to 15 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-241200- Massachusetts Bay and Ipswich Bay- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. .TUE...S winds 5 to 10 kt, becoming SE 15 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. Rain likely. .WED...SE winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Patchy fog. A chance of showers. .THU NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming SW 5 to 10 kt after midnight. Seas 2 to 4 ft. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. .FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .SAT...S winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...W 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. $$ ANZ231-241200- Cape Cod Bay- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .TUE...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 1 foot or less. .TUE NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Rain likely. .WED...SE winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 2 to 3 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt with gusts up to 30 kt, becoming S 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 4 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Patchy fog. A chance of showers. .THU NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming SW 5 to 10 kt after midnight. Seas 2 to 3 ft. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .SAT...SW winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...W winds 10 to 15 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-241200- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds around 5 kt. Seas around 2 ft. .TUE...S winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...SE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 4 ft. A chance of rain. .WED...SE winds 10 to 15 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 30 kt. Seas 4 to 7 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 20 to 25 kt, becoming S 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 7 to 10 ft, except 9 to 14 ft S and E of Nantucket. Patchy fog. Rain. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 6 to 9 ft. Patchy fog. .THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt after midnight. Seas 5 to 8 ft. .FRI...SW winds 5 to 10 kt. Seas 4 to 6 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. .SAT...SW winds 5 to 10 kt. Seas 3 to 5 ft. .SAT NIGHT...W winds 10 to 15 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. $$ ANZ255-241200- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .TUE...SE winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...SE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 4 ft. A chance of rain. .WED...SE winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 30 kt. Seas 7 to 10 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 20 to 25 kt, becoming S 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 9 to 12 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 7 to 10 ft. Patchy fog. A chance of showers. .THU NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt after midnight. Seas 5 to 8 ft. .FRI...SW winds 10 to 15 kt. Seas 4 to 6 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. .SAT...SW winds 10 to 15 kt. Seas 3 to 5 ft. .SAT NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-241200- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. .TUE...SE winds 5 to 10 kt. Seas around 2 ft. .TUE NIGHT...SE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 3 to 5 ft. Rain. .WED...SE winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 30 kt. Seas 7 to 10 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt with gusts up to 30 kt, becoming SW 10 to 15 kt with gusts up to 20 kt after midnight. Seas 8 to 13 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 7 to 10 ft. Patchy fog. .THU NIGHT...SW winds 15 to 20 kt, becoming W 10 to 15 kt after midnight. Seas 5 to 8 ft. .FRI...SW winds 10 to 15 kt. Seas 4 to 6 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. A chance of showers. .SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 4 ft. .SAT NIGHT...W winds 10 to 15 kt with gusts up to 20 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. $$ ANZ232-241200- Nantucket Sound- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 3 ft. A chance of rain. .WED...SE winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt with gusts up to 30 kt, becoming S 10 to 15 kt with gusts up to 20 kt after midnight. Seas 3 to 5 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Patchy fog. A chance of showers. .THU NIGHT...SW winds 10 to 15 kt. Gusts up to 25 kt in the evening. Seas 2 to 4 ft. .FRI...SW winds 10 to 15 kt. Seas 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .SAT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...W winds 10 to 15 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-241200- Vineyard Sound- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Patchy frost after midnight. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 to 3 ft. Rain. .WED...SE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt with gusts up to 30 kt, becoming S 10 to 15 kt after midnight. Seas 4 to 6 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 3 to 5 ft. Patchy fog. .THU NIGHT...W winds 15 to 20 kt, diminishing to around 10 kt after midnight. Seas 2 to 4 ft. .FRI...SW winds 10 to 15 kt. Seas 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .SAT...SW winds 10 to 15 kt. Seas around 2 ft. .SAT NIGHT...W 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. $$ ANZ234-241200- Buzzards Bay- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .TUE...S winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Rain. .WED...SE winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 30 kt. Seas 2 to 4 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt with gusts up to 25 kt, becoming S 10 to 15 kt after midnight. Seas 2 to 4 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .THU NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, becoming SW 5 to 10 kt after midnight. Seas 2 to 3 ft. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. A chance of showers. .SAT...SW winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...W winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-241200- Rhode Island Sound- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .TUE...SE winds 5 to 10 kt. Seas 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 4 ft. Rain. .WED...SE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 8 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 15 to 20 kt with gusts up to 30 kt, becoming S 10 to 15 kt with gusts up to 20 kt after midnight. Seas 7 to 10 ft. Patchy fog. Rain. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 5 to 8 ft. Patchy fog. .THU NIGHT...W winds 15 to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 4 to 6 ft. .FRI...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. .SAT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .SAT NIGHT...W 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. $$ ANZ237-241200- Block Island Sound- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 1 foot or less. .TUE...SE winds around 5 kt, becoming E in the afternoon. Seas 1 foot or less. .TUE NIGHT...E winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up to 20 kt after midnight. Seas 2 to 4 ft. Rain. .WED...SE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 8 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 10 to 15 kt, becoming SW 5 to 10 kt after midnight. Gusts up to 25 kt. Seas 6 to 9 ft. Patchy fog. A chance of rain. Vsby 1 NM or less. .THU...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 7 ft. .THU NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas 4 to 6 ft. .FRI...SW winds 10 to 15 kt. Seas 3 to 5 ft. .FRI NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. A chance of showers. .SAT...SW winds 10 to 15 kt. Seas 2 to 4 ft. .SAT NIGHT...W winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-241200- Boston Harbor- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 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. Waves 1 foot or less. Rain. .WED...SE winds 5 to 10 kt with gusts up to 20 kt. Waves 2 to 3 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 2 to 3 ft. Patchy fog. Rain likely. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Waves around 2 ft. .THU NIGHT...W winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. .FRI...SW winds 5 to 10 kt. Waves 1 foot or less. .FRI NIGHT...S winds 5 to 10 kt. Waves around 2 ft. A chance of showers. .SAT...SW winds 5 to 10 kt. Waves 1 foot or less. .SAT NIGHT...W 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. $$ ANZ236-241200- Narragansett Bay- 716 PM EDT Mon Apr 23 2018 .TONIGHT...S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Waves 1 foot or less. .TUE...S winds 5 to 10 kt. Waves 1 foot or less. .TUE NIGHT...SE winds 5 to 10 kt. Waves around 2 ft. Rain. .WED...SE winds 10 to 15 kt with gusts up to 30 kt. Waves 3 to 5 ft. Patchy fog. Rain. Vsby 1 NM or less. .WED NIGHT...SE winds 10 to 15 kt with gusts up to 25 kt, becoming S 5 to 10 kt after midnight. Waves 3 to 5 ft, except 5 to 8 ft at the bay entrance. Patchy fog. A chance of rain. Vsby 1 NM or less. .THU...SW winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Gusts up to 20 kt. Waves 2 to 4 ft. .THU NIGHT...W winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Waves 2 to 4 ft. .FRI...SW winds 5 to 10 kt. Waves 2 to 3 ft. .FRI NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. A chance of showers. .SAT...SW winds 5 to 10 kt. Waves around 2 ft. .SAT NIGHT...W winds 5 to 10 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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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