Coastal Waters Forecast
Issued by NWS Boston, MA

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436 FZUS51 KBOX 201404 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 1004 AM EDT Fri Sep 20 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-210300- 1004 AM EDT Fri Sep 20 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... Low pres SE of Nantucket will continue to combine with high pres over SE Quebec to generate gusty NE winds and building seas with periods of rain into early Sun. This low pres then move farther out to sea as high pres moves S from Quebec. Improving weather Sun into early next week. $$ ANZ250-210300- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 8 to 9 ft, building to 8 to 11 ft. Wave Detail: E 7 ft at 8 seconds and NE 4 ft at 5 seconds, becoming E 7 ft at 9 seconds and NE 6 ft at 7 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .TONIGHT...NE winds around 25 kt with gusts up to 35 kt. Seas 9 to 11 ft. Wave Detail: E 10 ft at 10 seconds and NE 6 ft at 7 seconds. Patchy fog. Showers likely, mainly in the evening. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 8 to 11 ft. Wave Detail: E 10 ft at 9 seconds and NE 5 ft at 6 seconds. Patchy fog. A chance of showers. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 7 to 9 ft. Wave Detail: E 9 ft at 9 seconds and NE 5 ft at 6 seconds. A chance of showers. .SUN AND SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 7 to 9 ft. Wave Detail: E 8 ft at 10 seconds and NE 2 ft at 5 seconds. .MON THROUGH TUE...E winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 8 ft. Wave Detail: E 8 ft at 11 seconds and NE 1 foot at 3 seconds. .TUE NIGHT...E winds around 10 kt. Seas 5 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-210300- Massachusetts Bay and Ipswich Bay- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: NE 7 ft at 7 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 9 ft. Wave Detail: E 9 ft at 9 seconds and N 5 ft at 6 seconds. Patchy fog. Showers likely in the evening. A chance of showers after midnight. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 9 ft. Wave Detail: E 9 ft at 9 seconds and NE 5 ft at 6 seconds. Patchy fog. A chance of showers. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 7 ft. Wave Detail: E 7 ft at 9 seconds and NE 4 ft at 6 seconds. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 2 ft at 5 seconds. .MON AND MON NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt. Seas 5 to 7 ft. Wave Detail: E 7 ft at 11 seconds and NE 1 foot at 4 seconds. .TUE AND TUE NIGHT...E winds around 10 kt. Seas 4 to 6 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. $$ ANZ231-210300- Cape Cod Bay- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft, building to 5 to 8 ft. Wave Detail: E 5 ft at 8 seconds and N 4 ft at 4 seconds, becoming E 6 ft at 9 seconds and N 5 ft at 5 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 20 to 25 kt with gusts up to 40 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 9 seconds and N 6 ft at 5 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 9 seconds and N 6 ft at 6 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: NE 6 ft at 9 seconds and N 5 ft at 6 seconds. Showers likely, mainly in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 6 ft. Wave Detail: E 5 ft at 10 seconds and N 4 ft at 6 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 5 to 6 ft. Wave Detail: E 5 ft at 10 seconds and N 3 ft at 4 seconds. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. .TUE AND TUE NIGHT...E winds around 10 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-210300- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 9 to 12 ft. Wave Detail: E 11 ft at 9 seconds and N 5 ft at 5 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 10 to 13 ft. Wave Detail: NE 12 ft at 10 seconds and N 4 ft at 6 seconds. Patchy fog. Showers. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .SAT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 9 to 12 ft. Wave Detail: NE 12 ft at 9 seconds and N 4 ft at 5 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 8 to 10 ft. Wave Detail: NE 10 ft at 9 seconds and N 4 ft at 6 seconds. A chance of showers. Patchy fog in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 10 ft. Wave Detail: E 9 ft at 10 seconds and NE 2 ft at 5 seconds. A chance of showers. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 8 to 10 ft. Wave Detail: E 10 ft at 11 seconds and NE 1 foot at 4 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt. Gusts up to 25 kt. Seas 7 to 10 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Seas 6 to 8 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. $$ ANZ255-210300- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to 11 ft. Wave Detail: N 8 ft at 6 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 8 to 11 ft. Wave Detail: E 10 ft at 10 seconds and N 6 ft at 6 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .SAT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 7 to 10 ft. Wave Detail: E 10 ft at 10 seconds and N 5 ft at 6 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt after midnight. Seas 6 to 9 ft. Wave Detail: E 9 ft at 9 seconds and N 4 ft at 5 seconds. Showers likely, mainly in the evening. Patchy fog in the evening. .SUN...NE winds 20 to 25 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 10 seconds and NE 4 ft at 5 seconds. A chance of showers. .SUN NIGHT...NE winds around 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. Wave Detail: E 8 ft at 11 seconds and NE 3 ft at 5 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-210300- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...N winds 25 to 30 kt with gusts up to 35 kt. Seas 7 to 9 ft. Wave Detail: E 6 ft at 8 seconds and N 5 ft at 5 seconds. Patchy fog. Showers likely. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...N winds 25 to 30 kt with gusts up to 40 kt. Seas 6 to 9 ft. Wave Detail: N 6 ft at 6 seconds and E 6 ft at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT...N winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Seas 6 to 9 ft. Wave Detail: N 6 ft at 6 seconds and E 6 ft at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM in the afternoon. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 6 ft at 9 seconds and N 5 ft at 5 seconds. A chance of showers. .SUN...NE winds 20 to 25 kt. Seas 5 to 7 ft. Wave Detail: E 7 ft at 10 seconds and NE 4 ft at 5 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 3 ft at 5 seconds. .MON THROUGH TUE...NE winds 15 to 20 kt. Seas 5 to 7 ft. .TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 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. $$ ANZ232-210300- Nantucket Sound- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 9 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 25 to 30 kt with gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 5 ft at 10 seconds and N 4 ft at 5 seconds. Patchy fog. Showers. Vsby 1 to 3 NM. .SAT...NE winds 25 to 30 kt, diminishing to 20 to 25 kt in the afternoon. Gusts up to 40 kt. Seas 5 to 7 ft. Wave Detail: E 5 ft at 10 seconds and N 4 ft at 5 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 10 seconds. Showers likely, mainly in the evening. Patchy fog in the evening. .SUN...NE winds 20 to 25 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 3 ft at 10 seconds. A chance of showers. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 4 ft at 10 seconds and NE 3 ft at 4 seconds. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-210300- Vineyard Sound- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 4 seconds and E 2 ft at 8 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .TONIGHT...N winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 9 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 9 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM in the afternoon. .SAT NIGHT...NE winds 15 to 20 kt. Gusts up to 30 kt in the evening. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 2 ft at 10 seconds. Showers likely, mainly in the evening. Patchy fog in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: NE 2 ft at 4 seconds and E 2 ft at 10 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: NE 2 ft at 4 seconds and E 2 ft at 10 seconds. .MON THROUGH TUE NIGHT...E 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. $$ ANZ234-210300- Buzzards Bay- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 4 ft, building to 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 8 seconds, becoming N 3 ft at 5 seconds and E 3 ft at 9 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 9 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .SAT...N winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 10 seconds. Patchy fog. Showers likely. .SAT NIGHT...NE winds 15 to 20 kt. Gusts up to 30 kt in the evening. Seas 3 to 5 ft. Wave Detail: N 3 ft at 5 seconds and E 3 ft at 10 seconds. Showers likely, mainly in the evening. Patchy fog in the evening. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 10 seconds and N 2 ft at 4 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 3 ft at 11 seconds and NE 2 ft at 4 seconds. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. .TUE AND TUE NIGHT...E winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-210300- Rhode Island Sound- 1004 AM EDT Fri Sep 20 2024 ...GALE WARNING IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and SE 3 ft at 8 seconds. Patchy fog. A chance of showers. .TONIGHT...N winds 20 to 25 kt with gusts up to 40 kt. Seas 4 to 6 ft. Wave Detail: N 5 ft at 5 seconds and SE 3 ft at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .SAT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and SE 3 ft at 9 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM in the afternoon. .SAT NIGHT...N winds 20 to 25 kt with gusts up to 30 kt, becoming NE 15 to 20 kt after midnight. Seas 4 to 5 ft. Wave Detail: N 4 ft at 5 seconds and SE 3 ft at 9 seconds. A chance of showers. .SUN...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and E 3 ft at 10 seconds. A chance of showers in the morning. .SUN NIGHT...NE winds 15 to 20 kt. Seas 4 to 5 ft. Wave Detail: NE 4 ft at 5 seconds and SE 2 ft at 10 seconds. .MON THROUGH TUE NIGHT...E 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. $$ ANZ237-210300- Block Island Sound- 1004 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...N winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: E 4 ft at 8 seconds and N 3 ft at 5 seconds. A slight chance of showers, then a chance of showers. .TONIGHT...N winds 20 to 25 kt with gusts up to 35 kt. Seas 4 to 6 ft. Wave Detail: N 4 ft at 5 seconds and E 4 ft at 9 seconds. Patchy fog. A chance of showers. .SAT...N winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and N 3 ft at 5 seconds. A chance of showers. .SAT NIGHT...NE winds 15 to 20 kt. Gusts up to 30 kt, decreasing to 20 kt after midnight. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and N 3 ft at 5 seconds. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: NE 4 ft at 6 seconds and E 4 ft at 9 seconds. .MON THROUGH TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 12 seconds and E 3 ft at 5 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-210300- Boston Harbor- 1004 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...NE winds 20 to 25 kt with gusts up to 30 kt. Waves 2 to 3 ft. Patchy fog. A chance of showers. Vsby 1 to 3 NM. .TONIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. Patchy fog. A chance of showers. .SAT...NE winds 15 to 20 kt with gusts up to 30 kt. Waves around 2 ft, except 4 to 6 ft at the outer harbor entrance. A chance of showers. .SAT NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt after midnight. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft, except 4 to 6 ft at the outer harbor entrance. .MON THROUGH TUE NIGHT...E winds 5 to 10 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. $$ ANZ236-210300- Narragansett Bay- 1004 AM EDT Fri Sep 20 2024 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH SATURDAY MORNING... .THIS AFTERNOON...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. Patchy fog. A chance of showers. .TONIGHT...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. Patchy fog. A chance of showers. .SAT...N winds 15 to 20 kt with gusts up to 30 kt. Waves 2 to 3 ft. Patchy fog. A chance of showers. .SAT NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. A chance of showers. .SUN AND SUN NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .MON THROUGH TUE NIGHT...E winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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