Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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461 FZUS51 KBOX 180505 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 105 AM EDT Wed Sep 18 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-181800- 105 AM EDT Wed Sep 18 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... High pres over New England will continue to provide dry, tranquil boating weather through much of Wed. Low pres near the Carolinas and mid-Atlantic coast then spreads a period of enhanced onshore easterly winds, building seas and periods of rain late Wed and into Thurs. High pres then returns for Fri into the weekend, with a continued enhanced east-northeast breeze. $$ ANZ250-181800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less. .WED...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SW 1 foot at 3 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 2 ft at 11 seconds. Patchy fog. A chance of showers after midnight. Vsby 1 to 3 NM. .THU...NE winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SE 5 ft at 10 seconds and NE 1 foot at 3 seconds. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 8 seconds and NE 1 foot at 3 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: E 7 ft at 9 seconds and NE 1 foot at 3 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 8 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-181800- Massachusetts Bay and Ipswich Bay- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 8 seconds and S 1 foot at 2 seconds. Patchy fog. Vsby 1 NM or less. .WED...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: E 2 ft at 9 seconds and SW 1 foot at 2 seconds. Patchy fog. Vsby 1 to 3 NM. .WED NIGHT...E winds 5 to 10 kt, becoming NE after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 2 ft at 11 seconds. Patchy fog. A chance of showers after midnight. Vsby 1 to 3 NM. .THU...NE winds around 10 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 10 seconds and NE 2 ft at 3 seconds. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT AND FRI...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: E 6 ft at 9 seconds and NE 2 ft at 4 seconds. .FRI NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 9 seconds and NE 2 ft at 4 seconds. .SAT THROUGH SUN NIGHT...NE winds 10 to 15 kt with gusts up to 25 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. $$ ANZ231-181800- Cape Cod Bay- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...S winds around 5 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 7 seconds. Patchy fog. Vsby 1 NM or less. .WED...SE winds around 5 kt, becoming E in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SW 1 foot at 2 seconds and SE 1 foot at 8 seconds, becoming SE 2 ft at 8 seconds and E 1 foot at 2 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 9 seconds and E 1 foot at 2 seconds. Patchy fog. A chance of showers. Vsby 1 to 3 NM after midnight. .THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and NE 2 ft at 3 seconds. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and E 3 ft at 8 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: E 5 ft at 8 seconds and SE 3 ft at 8 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-181800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 105 AM EDT Wed Sep 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH THURSDAY MORNING... .REST OF TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 12 seconds. Patchy fog. Vsby 1 NM or less. .WED...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 2 ft at 12 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and SE 2 ft at 11 seconds. Patchy fog. A chance of showers in the evening. Showers likely after midnight. Vsby 1 to 3 NM. .THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 7 ft. Wave Detail: SE 6 ft at 8 seconds and SE 2 ft at 11 seconds. A chance of showers. Patchy fog in the morning. .THU NIGHT AND FRI...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 6 to 7 ft. Wave Detail: E 7 ft at 8 seconds and SE 6 ft at 8 seconds. A chance of showers in the evening. A chance of showers in the afternoon. .FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 8 ft. Wave Detail: E 8 ft at 8 seconds and SE 2 ft at 9 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 6 to 9 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. $$ ANZ255-181800- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 105 AM EDT Wed Sep 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH THURSDAY MORNING... .REST OF TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 12 seconds. Patchy fog. Vsby 1 NM or less. .WED...E winds 10 to 15 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and SE 1 foot at 12 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .WED NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and E 1 foot at 3 seconds. Patchy fog. Showers likely. Vsby 1 to 3 NM. .THU...NE winds around 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. Wave Detail: SE 5 ft at 8 seconds and NE 2 ft at 4 seconds. A chance of showers. Patchy fog in the morning. .THU NIGHT THROUGH FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 7 ft. Wave Detail: E 6 ft at 8 seconds and SE 5 ft at 8 seconds. A chance of showers in the evening. A chance of showers through the night. .SAT THROUGH SUN NIGHT...NE winds 20 to 25 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 9 seconds and NE 4 ft at 5 seconds. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-181800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 105 AM EDT Wed Sep 18 2024 ...SMALL CRAFT ADVISORY IN EFFECT FROM THIS AFTERNOON THROUGH THURSDAY MORNING... .REST OF TONIGHT...E winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and SE 1 foot at 13 seconds. Patchy fog. Vsby 1 NM or less. .WED...E winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SE 5 ft at 8 seconds and SE 1 foot at 12 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .WED NIGHT...NE winds around 15 kt with gusts up to 20 kt. Seas 4 to 5 ft. Wave Detail: SE 5 ft at 8 seconds and NE 1 foot at 3 seconds. Patchy fog. A chance of showers. .THU...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 5 to 6 ft. Wave Detail: E 5 ft at 8 seconds and NE 3 ft at 4 seconds. A chance of showers. .THU NIGHT THROUGH FRI NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: NE 5 ft at 5 seconds and E 5 ft at 8 seconds. A chance of showers through the night. A chance of showers through the night. .SAT THROUGH SUN NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: E 7 ft at 10 seconds and NE 4 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. $$ ANZ232-181800- Nantucket Sound- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...SE winds around 5 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E 1 foot at 7 seconds. Patchy fog. Vsby 1 NM or less. .WED...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: E 2 ft at 3 seconds and SE 2 ft at 9 seconds. Patchy fog. A chance of showers in the evening. Showers likely after midnight. Vsby 1 to 3 NM. .THU...NE winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: NE 2 ft at 4 seconds and SE 2 ft at 8 seconds. A chance of showers. Patchy fog in the morning. .THU NIGHT AND FRI...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: NE 3 ft at 4 seconds and E 3 ft at 7 seconds. A chance of showers in the evening. A chance of showers in the afternoon. .FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and NE 3 ft at 4 seconds. .SAT AND SAT NIGHT...NE winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. .SUN AND SUN NIGHT...NE winds 20 to 25 kt, diminishing to 15 to 20 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-181800- Vineyard Sound- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...E winds around 5 kt. Seas 1 foot or less. Wave Detail: SE 1 foot at 8 seconds and SE 1 foot at 13 seconds. Patchy fog. Vsby 1 NM or less. .WED...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. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .WED NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. Patchy fog. A chance of showers. .THU...NE winds around 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NE 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers. .THU NIGHT AND FRI...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 3 seconds. A chance of showers in the evening. A chance of showers in the afternoon. .FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 4 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 3 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. $$ ANZ234-181800- Buzzards Bay- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...E winds around 5 kt. Seas 1 foot or less. Wave Detail: SE 1 foot at 8 seconds and SE 1 foot at 13 seconds. Patchy fog. Vsby 1 NM or less. .WED...E winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...NE winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SE 2 ft at 8 seconds and E 1 foot at 2 seconds. A chance of showers. Patchy fog in the evening. .THU...NE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Wave Detail: NE 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and E 3 ft at 8 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Wave Detail: E 3 ft at 8 seconds and NE 2 ft at 3 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-181800- Rhode Island Sound- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 13 seconds. Patchy fog. Vsby 1 NM or less. .WED...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. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .WED NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and NE 2 ft at 3 seconds. A chance of showers. .THU...NE winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and NE 2 ft at 4 seconds. A chance of showers. .THU NIGHT...NE winds around 15 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and E 3 ft at 8 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and E 4 ft at 9 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 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. $$ ANZ237-181800- Block Island Sound- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and SE 1 foot at 13 seconds. Patchy fog. Vsby 1 NM or less. .WED...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and NE 1 foot at 2 seconds. Patchy fog in the morning. A chance of showers in the afternoon. Vsby 1 NM or less in the morning. .WED NIGHT...NE winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 3 to 4 ft. Wave Detail: SE 4 ft at 8 seconds and NE 1 foot at 2 seconds. A chance of showers. .THU...NE winds around 15 kt with gusts up to 20 kt. Seas 3 to 5 ft. Wave Detail: SE 4 ft at 8 seconds and NE 2 ft at 3 seconds. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 5 ft. Wave Detail: E 4 ft at 8 seconds and NE 2 ft at 4 seconds. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: E 4 ft at 9 seconds and NE 2 ft at 4 seconds. .SAT THROUGH SUN NIGHT...NE winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 5 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-181800- Boston Harbor- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...SW winds around 5 kt. Waves 1 foot or less. .WED...S winds around 5 kt, becoming E in the afternoon. Waves 1 foot or less. Patchy fog in the afternoon with vsby 1 to 3 NM. .WED NIGHT...E winds 5 to 10 kt, becoming NE after midnight. Waves 1 foot or less. Patchy fog. A chance of showers. Vsby 1 to 3 NM after midnight. .THU...NE winds around 10 kt. Waves 1 foot or less, then 2 to 3 ft in the afternoon. A chance of showers. Patchy fog in the morning with vsby 1 to 3 NM. .THU NIGHT...NE winds 5 to 10 kt. Waves around 2 ft in the evening, then 1 foot or less. At the outer harbor entrance, waves 2 to 4 ft. A chance of showers in the evening. .FRI AND FRI 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. .SAT THROUGH 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. 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. $$ ANZ236-181800- Narragansett Bay- 105 AM EDT Wed Sep 18 2024 .REST OF TONIGHT...E winds around 5 kt. Waves around 2 ft. Patchy fog. Vsby 1 NM or less. .WED...E winds 5 to 10 kt. Waves 2 to 3 ft. Patchy fog in the morning with vsby 1 NM or less. .WED NIGHT...NE winds 5 to 10 kt. Waves 2 to 3 ft. A chance of showers. .THU...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers. .THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers in the evening. .FRI AND FRI NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. .SAT THROUGH SUN NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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