FZUS51 KBOX 151705 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 105 PM EDT Thu May 15 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-160600- 105 PM EDT Thu May 15 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... Sporadic showers and possibly some embedded thunder continue into the mid-afternoon hours before dissipating after sunset. Areas of dense fog developing over night with east/southeast winds. High pressure supports dry/quiet weather over the coastal waters tomorrow afternoon. $$ ANZ250-160600- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds around 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...SE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and SE 2 ft at 4 seconds. Patchy fog in the morning. Showers likely in the afternoon. Vsby 1 to 3 NM in the morning. .SAT NIGHT...S winds 10 to 15 kt with gusts up to 20 kt, becoming W after midnight. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds and SE 2 ft at 4 seconds. Showers likely, mainly in the evening. .SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-160600- Massachusetts Bay and Ipswich Bay- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 1 foot at 3 seconds and SE 1 foot at 7 seconds. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and E 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 4 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...SE winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and SE 2 ft at 8 seconds. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...S winds around 10 kt, becoming W after midnight. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 4 seconds and SE 1 foot at 7 seconds. Showers likely, mainly in the evening. .SUN THROUGH MON NIGHT...NW 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. $$ ANZ231-160600- Cape Cod Bay- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SE 1 foot at 3 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SE 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 1 foot or less. Wave Detail: E 1 foot at 4 seconds and SE 1 foot at 7 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SE 1 foot at 5 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SE 1 foot at 3 seconds and SE 1 foot at 8 seconds, becoming SE 2 ft at 7 seconds and SE 1 foot at 3 seconds. Patchy fog in the morning. Showers likely in the afternoon. Vsby 1 to 3 NM in the morning. .SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 1 foot at 4 seconds and SE 1 foot at 7 seconds. A chance of showers. .SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-160600- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 105 PM EDT Thu May 15 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 AM EDT FRIDAY... .THIS AFTERNOON...SE winds around 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: S 3 ft at 6 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds. A chance of showers. .SUN THROUGH MON NIGHT...NW 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. $$ ANZ255-160600- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 105 PM EDT Thu May 15 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 AM EDT FRIDAY... .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 8 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less. .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas 3 to 5 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 7 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...N winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-160600- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 105 PM EDT Thu May 15 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 1 AM EDT FRIDAY... .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 8 seconds. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...S winds around 5 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds around 5 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds 5 to 10 kt. Seas around 3 ft. Wave Detail: SE 3 ft at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...SW winds 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and SE 2 ft at 8 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW winds 15 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. $$ ANZ232-160600- Nantucket Sound- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 8 seconds and SE 1 foot at 4 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less. .TONIGHT...S winds around 5 kt. Seas around 2 ft. Wave Detail: S 2 ft at 8 seconds and E 1 foot at 5 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot at 2 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds around 5 kt. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 2 seconds, becoming SW 1 foot at 2 seconds and SE 1 foot at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 1 foot at 7 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 to 3 NM in the morning. .SAT NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-160600- Vineyard Sound- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds around 5 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and SE 1 foot at 3 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and E 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 8 seconds and SW 1 foot at 2 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SW 1 foot at 2 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and S 1 foot at 2 seconds. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW 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. $$ ANZ234-160600- Buzzards Bay- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds around 5 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SE 1 foot at 3 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...S winds around 5 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and E 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: SE 2 ft at 6 seconds, becoming SW 1 foot at 2 seconds and E 1 foot at 4 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and SE 1 foot at 6 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 3 seconds, becoming S 2 ft at 4 seconds and SE 2 ft at 7 seconds. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and SW 1 foot at 3 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-160600- Rhode Island Sound- 105 PM EDT Thu May 15 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON... .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. A chance of showers. Vsby 1 NM or less. .TONIGHT...S winds around 5 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and S 1 foot at 5 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds around 5 kt, becoming S in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds. Patchy fog. Vsby 1 NM or less in the morning. .FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...SW winds 10 to 15 kt. Seas around 3 ft. Wave Detail: SE 3 ft at 7 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW 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. $$ ANZ237-160600- Block Island Sound- 105 PM EDT Thu May 15 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 PM EDT THIS AFTERNOON... .THIS AFTERNOON...SE winds around 5 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. A slight chance of showers. Vsby 1 NM or less. .TONIGHT...SE winds around 5 kt, becoming S after midnight. Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. A chance of showers in the morning. Showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-160600- Boston Harbor- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...E winds 5 to 10 kt. Waves 1 foot or less. Patchy fog. A slight chance of showers. Vsby 1 to 3 NM. .TONIGHT...S winds around 5 kt. Waves 1 foot or less. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. Patchy fog after midnight with vsby 1 to 3 NM. .SAT...SE winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft in the afternoon. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...S winds 5 to 10 kt, becoming W after midnight. Waves around 2 ft in the evening, then 1 foot or less. Showers likely, mainly in the evening. .SUN THROUGH 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. $$ ANZ236-160600- Narragansett Bay- 105 PM EDT Thu May 15 2025 .THIS AFTERNOON...SE winds around 5 kt. Waves 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...S winds around 5 kt. Waves 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .FRI...S winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Waves 2 to 3 ft. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...S winds around 5 kt. Waves around 2 ft. Patchy fog. Vsby 1 to 3 NM. .SAT...S winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers in the morning, then showers likely in the afternoon. Patchy fog in the morning with vsby 1 to 3 NM. .SAT NIGHT...SW winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers in the evening. .SUN THROUGH MON NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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