FZUS51 KBOX 161102 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 702 AM EDT Thu Apr 16 2026 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-170000- 702 AM EDT Thu Apr 16 2026 .Synopsis for Massachusetts and Rhode Island coastal waters... A backdoor cold front remains over northern New England that may cross through the northern MA waters again today. A cold front likely crosses waters sometime Fri/Fri night followed by a stronger cold front sometime Sun/Sun night. Early next week, high pres builds from the Great Lakes to the Mid Atlantic. $$ ANZ250-170000- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 702 AM EDT Thu Apr 16 2026 .TODAY...E winds 5 to 10 kt. Seas around 2 ft. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .FRI...W winds 5 to 10 kt, becoming NE in the afternoon. Seas around 2 ft. A chance of rain in the morning, then a chance of showers in the afternoon. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of rain in the evening. .SAT...NE winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 15 to 20 kt, becoming W. Gusts up to 25 kt. Seas 2 to 4 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-170000- Massachusetts Bay and Ipswich Bay- 702 AM EDT Thu Apr 16 2026 .TODAY...NE winds 5 to 10 kt. Seas 1 foot or less. Patchy fog. A slight chance of showers this afternoon. Vsby 1 NM or less. .TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Patchy fog. A chance of showers in the evening. Vsby 1 to 3 NM. .FRI...W winds 5 to 10 kt, becoming NE in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. A chance of rain in the morning, then a chance of showers in the afternoon. Patchy fog in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of rain in the evening. .SAT...NE winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 15 to 20 kt, becoming W. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 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. $$ ANZ231-170000- Cape Cod Bay- 702 AM EDT Thu Apr 16 2026 .TODAY...S winds around 5 kt, becoming SE this afternoon. Seas 1 foot or less. Patchy fog. Vsby 1 NM or less. .TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM after midnight. .FRI...W winds 5 to 10 kt, becoming N in the afternoon. Seas 1 foot or less. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. A chance of rain in the evening. .SAT...NE winds 5 to 10 kt. Seas 1 foot or less. .SAT NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-170000- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 5 to 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Patchy fog. A slight chance of showers this morning. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 NM or less. .FRI...W winds 5 to 10 kt, becoming N in the afternoon. Seas 2 to 4 ft. Patchy fog. A chance of showers in the afternoon. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. .SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. .SUN...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Showers likely. .SUN NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Showers likely. .MON...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. .MON NIGHT...NW winds 15 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. $$ ANZ255-170000- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Patchy fog. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Patchy fog. Vsby 1 NM or less. .FRI...W winds 10 to 15 kt, diminishing to 5 to 10 kt in the afternoon. Seas 3 to 5 ft. Patchy fog. Vsby 1 NM or less. .FRI NIGHT...NE winds 5 to 10 kt. Seas 3 to 4 ft. .SAT...NE winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. .SUN...S winds 15 to 20 kt. Seas 3 to 5 ft. Showers likely. .SUN NIGHT...W winds 20 to 25 kt. Seas 4 to 6 ft. Showers likely. .MON...W winds 20 to 25 kt. Seas 4 to 6 ft. .MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-170000- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 10 to 15 kt. Seas 3 to 4 ft. Patchy fog. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .FRI...W winds 5 to 10 kt. Seas 4 to 5 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds around 10 kt. Seas 3 to 4 ft. A chance of showers in the evening. .SAT...NE winds 10 to 15 kt. Seas 2 to 3 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas 2 to 3 ft. .SUN...SW winds 15 to 20 kt. Seas 2 to 4 ft. Showers likely. .SUN NIGHT...W winds 20 to 25 kt. Seas 4 to 5 ft. Showers likely. .MON AND MON NIGHT...NW winds 20 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. $$ ANZ232-170000- Nantucket Sound- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Patchy fog. Vsby 1 to 3 NM. .FRI...W winds 5 to 10 kt, becoming NW in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the evening. .SAT...NE winds 5 to 10 kt. Seas around 2 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-170000- Vineyard Sound- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM this afternoon. .TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Patchy fog after midnight with vsby 1 NM or less. .FRI...SW winds 5 to 10 kt, becoming NW in the afternoon. Seas 2 to 3 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT...NE winds around 10 kt. Seas around 2 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Gusts up to 25 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 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. $$ ANZ234-170000- Buzzards Bay- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Seas around 2 ft. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM this afternoon. .TONIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...SW winds 5 to 10 kt, becoming NW in the afternoon. Seas around 2 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas around 2 ft. A chance of rain in the evening. .SAT...NE winds around 10 kt. Seas around 2 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft in the evening, then 1 foot or less. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...W winds 15 to 20 kt, becoming NW 10 to 15 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-170000- Rhode Island Sound- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 10 to 15 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .FRI...W winds 5 to 10 kt. Seas 3 to 4 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .FRI NIGHT...NE winds around 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT...NE winds around 10 kt. Seas 2 to 3 ft. .SAT NIGHT...E winds 5 to 10 kt, becoming SE after midnight. Seas around 2 ft. .SUN...SW winds 15 to 20 kt. Seas 2 to 4 ft. Showers likely. .SUN NIGHT...W winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Showers likely. .MON AND MON NIGHT...NW 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. $$ ANZ237-170000- Block Island Sound- 702 AM EDT Thu Apr 16 2026 .TODAY...SW winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Seas 2 to 3 ft. Patchy fog this morning with vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Gusts up to 20 kt. Seas 2 to 4 ft. Patchy fog after midnight with vsby 1 to 3 NM. .FRI...W winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers in the evening. .SAT...E winds 5 to 10 kt. Seas 2 to 3 ft. .SAT NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming NW 15 to 20 kt. Seas 2 to 3 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-170000- Boston Harbor- 702 AM EDT Thu Apr 16 2026 .TODAY...E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A slight chance of showers this afternoon. Vsby 1 NM or less, increasing to 1 to 3 NM this afternoon. .TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. Patchy fog. A chance of showers in the evening. Vsby 1 to 3 NM. .FRI...W winds around 5 kt, becoming NE in the afternoon. Waves 1 foot or less. A chance of rain in the morning, then a chance of showers in the afternoon. Patchy fog in the morning. .FRI NIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. A chance of rain in the evening. .SAT...NE winds 5 to 10 kt. Waves 1 foot or less. .SAT NIGHT...E winds 5 to 10 kt, becoming S after midnight. Waves 1 foot or less. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W 15 to 20 kt. Waves around 2 ft. Showers likely. .MON AND MON NIGHT...NW winds 15 to 20 kt, diminishing to 10 to 15 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. $$ ANZ236-170000- Narragansett Bay- 702 AM EDT Thu Apr 16 2026 .TODAY...S winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Waves around 2 ft. Patchy fog this morning with vsby 1 NM or less. .TONIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after midnight. Waves around 2 ft. Patchy fog after midnight. .FRI...SW winds around 5 kt, becoming NW in the afternoon. Waves around 2 ft. A chance of showers in the afternoon. .FRI NIGHT...NE winds 5 to 10 kt. Waves around 2 ft. A chance of rain in the evening. .SAT...NE winds 5 to 10 kt. Waves around 2 ft. .SAT NIGHT...SE winds 5 to 10 kt. Waves around 2 ft. .SUN AND SUN NIGHT...SW winds 10 to 15 kt, becoming W. Gusts up to 20 kt. Waves around 2 ft. Showers likely. .MON AND MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ For the latest updates...please visit our webpage at www.weather.gov/boston You can follow us on Facebook at www.facebook.com/us.nationalweatherservice.boston.gov You can follow us on Twitter at @NWSBoston