


Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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135 FZUS51 KBOX 022305 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 704 PM EDT Tue Sep 2 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-031200- 704 PM EDT Tue Sep 2 2025 .Synopsis for Massachusetts and Rhode Island coastal waters... High pressure will continue to dominate through the middle of next week before a cold front approaches from the west.Expect dry conditions and winds less than 25 kts through Thursday, although seas may start to build tonight into Tuesday to around 4 feet on the outer waters. Next chance for precipitation comes Friday and Saturday as the cold front moves through. $$ ANZ250-031200- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 704 PM EDT Tue Sep 2 2025 .TONIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 2 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 1 foot at 2 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .THU...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 2 ft at 3 seconds. Patchy fog. Vsby 1 NM or less. .THU NIGHT AND FRI...S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds and E 3 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds and SE 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Patchy fog. Vsby 1 NM or less. .SAT NIGHT AND SUN...SW winds 15 to 20 kt, becoming W 10 to 15 kt. Gusts up to 25 kt. Seas 2 to 3 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...W winds around 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Patchy dense fog. Vsby 1 NM or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-031200- Massachusetts Bay and Ipswich Bay- 704 PM EDT Tue Sep 2 2025 .TONIGHT...S winds 5 to 10 kt, becoming SW after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and E 1 foot at 3 seconds. .WED...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at 3 seconds. .WED NIGHT...S winds 10 to 15 kt, becoming SW 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 1 foot at 3 seconds. Patchy fog after midnight with vsby 1 NM or less. .THU...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and SE 2 ft at 4 seconds. Patchy fog. Vsby 1 NM or less. .THU NIGHT AND FRI...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and E 2 ft at 8 seconds. Patchy dense fog. Vsby 1 NM or less. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 7 seconds. Widespread dense fog. Vsby 1 NM or less. .SAT AND SAT NIGHT...S winds 15 to 20 kt, becoming W. Gusts up to 25 kt. Seas 2 to 3 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN...W winds around 10 kt. Seas around 2 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...W winds around 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. $$ ANZ231-031200- Cape Cod Bay- 704 PM EDT Tue Sep 2 2025 .TONIGHT...SE winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and E 1 foot at 2 seconds. .WED...E winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at 2 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SE 1 foot at 2 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .THU...S winds around 5 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 2 seconds. .THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and SW 1 foot at 3 seconds. .FRI AND FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 4 seconds and E 2 ft at 8 seconds. Patchy dense fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Patchy dense fog. Vsby 1 NM or less. .SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN...NW winds around 10 kt. Seas around 2 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...W winds around 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-031200- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. .WED...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .WED NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds and S 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less. .THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and S 2 ft at 3 seconds. Patchy dense fog. Vsby 1 NM or less. .FRI AND FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and E 3 ft at 8 seconds. Patchy dense fog in the morning. Widespread dense fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Widespread dense fog. Vsby 1 NM or less. .SAT NIGHT THROUGH SUN NIGHT...W winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Widespread dense fog. A chance of showers. Vsby 1 NM 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. $$ ANZ255-031200- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: E 4 ft at 8 seconds. .WED...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. .WED NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. Patchy fog in the afternoon with vsby 1 NM or less. .THU NIGHT THROUGH FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 3 ft at 8 seconds. Patchy dense fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and SE 2 ft at 9 seconds. Patchy dense fog. Vsby 1 NM or less. .SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN...W winds 10 to 15 kt. Seas 2 to 4 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...NW winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. Vsby 1 to 3 NM. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-031200- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds. .WED...NE winds 5 to 10 kt, becoming E in the afternoon. Seas 3 to 4 ft. Wave Detail: E 4 ft at 8 seconds. .WED NIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: E 3 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .THU...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and S 1 foot at 3 seconds. .THU NIGHT THROUGH FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and S 3 ft at 4 seconds. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 7 seconds and SE 1 foot at 9 seconds. .SAT NIGHT AND SUN...SW winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt. Seas 3 to 5 ft. A chance of showers. .SUN NIGHT...NW 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. $$ ANZ232-031200- Nantucket Sound- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and E 1 foot at 3 seconds. .WED...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and NE 1 foot at 2 seconds. .WED NIGHT...SE winds 5 to 10 kt, becoming S after midnight. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and E 1 foot at 2 seconds. Patchy fog after midnight. .THU...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and E 1 foot at 8 seconds. .THU NIGHT THROUGH FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and E 1 foot at 8 seconds. Patchy dense fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas around 3 ft. Wave Detail: SW 3 ft at 4 seconds and SW 2 ft at 7 seconds. Patchy dense fog. Vsby 1 NM or less. .SAT NIGHT AND SUN...SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 10 to 15 kt. Seas 2 to 3 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...W winds 10 to 15 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-031200- Vineyard Sound- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. .WED...NE winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot at 8 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot at 8 seconds. Patchy fog after midnight. .THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and S 1 foot at 2 seconds. .THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 7 seconds. .FRI AND FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 6 seconds and S 2 ft at 4 seconds. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. .SAT NIGHT AND SUN...SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. .SUN NIGHT...NW winds 10 to 15 kt. Seas around 2 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. $$ ANZ234-031200- Buzzards Bay- 704 PM EDT Tue Sep 2 2025 .TONIGHT...SE winds 5 to 10 kt, becoming E after midnight. Seas around 2 ft this evening, then 1 foot or less. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds, becoming SE 1 foot at 8 seconds. .WED...NE winds around 5 kt, becoming SE in the afternoon. Seas 1 foot or less. Wave Detail: SE 1 foot at 2 seconds and SE 1 foot at 8 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 8 seconds. .THU...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: S 1 foot at 2 seconds and SE 1 foot at 8 seconds, becoming S 1 foot at 3 seconds and SE 1 foot at 7 seconds. .THU NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 7 seconds and S 2 ft at 4 seconds. Patchy dense fog. Vsby 1 NM or less. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Patchy dense fog in the evening. Widespread dense fog after midnight. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Widespread dense fog. Vsby 1 NM or less. .SAT NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Widespread dense fog. A chance of showers. Vsby 1 NM or less. .SUN...W winds 10 to 15 kt. Seas around 2 ft. Widespread dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...NW winds 10 to 15 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-031200- Rhode Island Sound- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 2 seconds. .WED...NE winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds. Patchy fog after midnight with vsby 1 to 3 NM. .THU...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 7 seconds. .THU NIGHT THROUGH FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 7 seconds and S 3 ft at 4 seconds. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and SW 1 foot at 4 seconds. .SAT NIGHT AND SUN...SW winds 15 to 20 kt with gusts up to 25 kt, becoming W 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. .SUN NIGHT...NW 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. $$ ANZ237-031200- Block Island Sound- 704 PM EDT Tue Sep 2 2025 .TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and E 1 foot at 3 seconds. .WED...NE winds around 5 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. .WED NIGHT...S winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds. Patchy fog after midnight with vsby 1 NM or less. .THU...S winds 5 to 10 kt. Gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 7 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT AND FRI...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and S 2 ft at 4 seconds. Patchy dense fog. Vsby 1 NM or less. .FRI NIGHT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. Patchy dense fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Patchy dense fog. Vsby 1 NM or less. .SAT NIGHT AND SUN...W winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt. Seas 2 to 4 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...NW winds around 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-031200- Boston Harbor- 704 PM EDT Tue Sep 2 2025 .TONIGHT...SE winds 5 to 10 kt, becoming SW after midnight. Waves 1 foot or less. .WED...S winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. .WED NIGHT...S winds 5 to 10 kt, becoming SW after midnight. Waves around 2 ft in the evening, then 1 foot or less. .THU...S winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves 1 foot or less, then 2 to 3 ft in the afternoon. .THU NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. A chance of showers after midnight with vsby 1 to 3 NM. .FRI AND FRI NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Waves around 2 ft. .SAT AND SAT NIGHT...S winds 15 to 20 kt, becoming W. Gusts up to 25 kt. Waves around 2 ft. A chance of showers. Vsby 1 to 3 NM. .SUN...W winds around 10 kt. Waves around 2 ft. A chance of showers. .SUN NIGHT...W winds around 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. $$ ANZ236-031200- Narragansett Bay- 704 PM EDT Tue Sep 2 2025 .TONIGHT...SE winds 5 to 10 kt, becoming N after midnight. Waves around 2 ft. .WED...NE winds around 5 kt, becoming S in the afternoon. Waves around 2 ft. .WED NIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog. Vsby 1 to 3 NM. .THU...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves around 2 ft. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...S winds 10 to 15 kt. Waves around 2 ft. Patchy dense fog. Vsby 1 NM or less. .FRI...S winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Waves 2 to 3 ft. Widespread dense fog. Vsby 1 NM or less. .FRI NIGHT...S winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Widespread dense fog. Vsby 1 NM or less. .SAT...S winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 3 ft. Widespread dense fog. Vsby 1 NM or less. .SAT NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Widespread dense fog. A chance of showers. Vsby 1 NM or less. .SUN...W winds around 10 kt. Waves around 2 ft. Patchy dense fog. A chance of showers. Vsby 1 NM or less. .SUN NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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