FZUS51 KBOX 180504 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 104 AM EDT Mon May 18 2026 Coastal waters from the Merrimack River MA to Watch Hill RI out to 60 NM ANZ200-181800- 104 AM EDT Mon May 18 2026 .Synopsis for Massachusetts and Rhode Island coastal waters... A cold front will drop S across northern New Eng today pushing through southern New Eng and the waters tonight. High pres will build over the eastern waters Mon, then a warm front will lift to the N by Tue. A strong cold front will cross the waters late Wed and Wed evening followed by high pres building in from the NW Thu into Fri. $$ ANZ250-181800- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: E 2 ft at 8 seconds and NW 1 foot at 3 seconds. .MON...E winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 7 seconds and W 1 foot at 3 seconds. .MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds. .TUE...SW winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 3 ft at 8 seconds. .TUE NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 3 ft at 8 seconds. .WED AND WED NIGHT...NW winds around 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 3 ft at 8 seconds. A chance of showers through the night. .THU THROUGH FRI...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-181800- Massachusetts Bay and Ipswich Bay- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and NE 1 foot at 8 seconds. .MON...E winds 5 to 10 kt, becoming SE 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 2 ft at 5 seconds. .MON NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds. .TUE...SW winds around 10 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 6 seconds. .TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 6 seconds. .WED AND WED NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 8 seconds. A chance of showers through the night. .THU THROUGH FRI...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .FRI NIGHT...SE winds 5 to 10 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. $$ ANZ231-181800- Cape Cod Bay- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NE winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and E 1 foot at 8 seconds. .MON...SE winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: NE 1 foot at 2 seconds and NW 1 foot at 3 seconds, becoming E 1 foot at 2 seconds and NW 1 foot at 3 seconds. .MON NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SE 1 foot at 3 seconds and E 1 foot at 14 seconds. .TUE...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 4 seconds. .TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and SE 2 ft at 10 seconds. .WED AND WED NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and SE 2 ft at 9 seconds. A chance of showers through the night. .THU THROUGH FRI...E winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 1 foot or less. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-181800- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NE winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 8 seconds and W 2 ft at 4 seconds. .MON...E winds around 10 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: NE 3 ft at 7 seconds and W 2 ft at 4 seconds. .MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT...SW winds around 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. .WED...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. A chance of showers in the afternoon. .WED NIGHT...SW winds 15 to 20 kt, becoming NW 10 to 15 kt after midnight. Gusts up to 25 kt. Seas 4 to 6 ft. A chance of showers. .THU THROUGH FRI...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 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. $$ ANZ255-181800- Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 to 3 NM. .MON...E winds 5 to 10 kt, becoming SE in the afternoon. Seas 2 to 4 ft. Wave Detail: S 4 ft at 7 seconds and SE 3 ft at 8 seconds. .MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT AND WED...SW winds 20 to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and E 2 ft at 9 seconds. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 5 to 7 ft, subsiding to 3 to 5 ft after midnight. Wave Detail: SW 7 ft at 7 seconds and E 2 ft at 10 seconds, becoming SW 5 ft at 7 seconds and SE 2 ft at 9 seconds. A chance of showers. .THU AND THU NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming E 5 to 10 kt. Seas 2 to 4 ft. .FRI...E winds 5 to 10 kt. Seas around 2 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-181800- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NW winds 5 to 10 kt. Seas around 4 ft. Wave Detail: SW 4 ft at 7 seconds and SE 4 ft at 8 seconds. .MON...E winds 5 to 10 kt, becoming SE in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and SE 3 ft at 8 seconds. .MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 3 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT AND WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and SE 4 ft at 9 seconds. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and SE 2 ft at 9 seconds. A chance of showers. .THU THROUGH FRI...E winds 10 to 15 kt. Seas 2 to 4 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 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. $$ ANZ232-181800- Nantucket Sound- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot at 8 seconds. .MON...E winds around 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: E 1 foot at 5 seconds and SW 1 foot at 6 seconds. .MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 5 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT AND WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 4 seconds and SE 1 foot at 9 seconds. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers. .THU THROUGH FRI...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-181800- Vineyard Sound- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and SE 2 ft at 9 seconds. .MON...E winds around 10 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and E 2 ft at 4 seconds. .MON NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 6 seconds and SE 1 foot at 6 seconds. Patchy fog. Vsby 1 to 3 NM, decreasing to 1 NM or less after midnight. .TUE...SW 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 S 1 foot at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and SE 3 ft at 6 seconds. .WED AND WED NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5ft at 7 seconds and SE 2 ft at 5 seconds. A chance of showers. .THU THROUGH FRI...E winds 10 to 15 kt. Seas 2 to 3 ft. .FRI NIGHT...SE winds 5 to 10 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. $$ ANZ234-181800- Buzzards Bay- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 6 seconds and SE 1 foot at 8 seconds. .MON...E winds 5 to 10 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: E 1 foot at 2 seconds and SW 1 foot at 7 seconds. .MON NIGHT...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds. Patchy fog after midnight with vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 10 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 5 seconds. .WED AND WED NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds. A chance of showers through the night. .THU THROUGH FRI...E winds 5 to 10 kt. Seas around 2 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-181800- Rhode Island Sound- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and S 4 ft at 8 seconds. .MON...E winds around 10 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. .MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT...SW winds around 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 7 seconds. .WED...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and SE 5 ft at 9 seconds. A chance of showers in the afternoon. .WED NIGHT...W winds 15 to 20 kt with gusts up to 25 kt, becoming NW 10 to 15 kt after midnight. Seas 3 to 5 ft. A chance of showers. .THU AND THU NIGHT...NE winds 10 to 15 kt, becoming SE 5 to 10 kt. Seas 2 to 4 ft. .FRI...E winds around 10 kt. Seas around 2 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 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. $$ ANZ237-181800- Block Island Sound- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds around 5 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and SW 2 ft at 7 seconds. .MON...E winds 5 to 10 kt, becoming SE in the afternoon. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and SE 3 ft at 8 seconds. .MON NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 2 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 9 seconds. .TUE NIGHT...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 3 ft at 9 seconds. .WED AND WED NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt.Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and SE 3 ft at 8 seconds. A chance of showers. .THU THROUGH FRI...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-181800- Boston Harbor- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NE winds 5 to 10 kt. Waves 1 foot or less. .MON...E winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Waves 1 foot or less, then around 2 ft in the afternoon. .MON NIGHT...S winds around 10 kt. Waves around 2 ft. .TUE...SW winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Waves around 2 ft. .TUE NIGHT...SW winds around 15 kt with gusts up to 20 kt. Waves around 2 ft. .WED AND WED NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. Showers likely through the night. .THU THROUGH FRI...E winds 10 to 15 kt. Waves around 2 ft. .FRI NIGHT...SE winds 5 to 10 kt. Waves 1 foot or less. 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. $$ ANZ236-181800- Narragansett Bay- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds 5 to 10 kt. Waves around 2 ft. .MON...E winds 5 to 10 kt, becoming SE in the afternoon. Waves around 2 ft. .MON NIGHT...S winds around 10 kt. Waves around 2 ft. Patchy fog after midnight with vsby 1 NM or less. .TUE...SW winds 10 to 15 kt, increasing to 15 to 20 kt in the afternoon. Gusts up to 25 kt. Waves 2 to 3 ft. .TUE NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. .WED AND WED NIGHT...NW winds 15 to 20 kt with gusts up to 25 kt. Waves 2 to 4 ft. A chance of showers through the night. .THU THROUGH FRI...E winds 10 to 15 kt. Waves around 2 ft. .FRI NIGHT...SE winds 5 to 10 kt. Waves around 2 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ280-181800- Ocean Waters from the Merrimack River to Plymouth from 40 to 60 NM- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...NE winds around 10 kt. Seas around 3 ft. Wave Detail: SE 3 ft at 8 seconds and NW 1 foot at 3 seconds. .MON...E winds around 10 kt, becoming SE in the afternoon. Seas around 3 ft. Wave Detail: NE 3 ft at 7 seconds and W 1 foot at 3 seconds. .MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 4 seconds and SE 3 ft at 7 seconds. Patchy fog after midnight with vsby 1 NM or less. .TUE...SW winds around 15 kt with gusts up to 20 kt, increasing to 20 to 25 kt with gusts up to 30 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT...SW winds 20 to 25 kt, diminishing to 15 to 20 kt after midnight. Gusts up to 30 kt. Seas 5 to 6 ft. Wave Detail: S 6 ft at 7 seconds. .WED AND WED NIGHT...NW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft at 7 seconds. A chance of showers through the night. .THU THROUGH FRI NIGHT...S 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. $$ ANZ281-181800- Ocean Waters from Provincetown to Nantucket from 20 to 60 NM- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...N winds 5 to 10 kt. Seas3 to 5 ft. Wave Detail: W 4 ft at 7 seconds and SE 3 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .MON...E winds around 10 kt, becoming SE in the afternoon. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and NE 3 ft at 7 seconds. .MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt, increasing to 20 to 25 kt in the afternoon. Gusts up to 30 kt. Seas 3 to 4 ft, building to 4 to 6 ft in the afternoon. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 9 seconds, becoming SW 6 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT AND WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: SW 7 ft at 7 seconds and SE 2 ft at 9 seconds. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt, becoming NW 10 to 15 kt with gusts up to 20 kt after midnight. Seas 5 to 7 ft. Wave Detail: SW 7 ft at 7 seconds and SE 2 ft at 9 seconds. A chance of showers. .THU THROUGH FRI...E winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. .FRI NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ282-181800- Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...W winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S 5 ft at 7 seconds and E 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .MON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt after midnight. Seas around 3 ft. Wave Detail: S 3 ft at 7 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT AND WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and SE 2 ft at 9 seconds. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt, becoming NW 10 to 15 kt with gusts up to 20 kt after midnight. Seas 6 to 7 ft, subsiding to 4 to 6 ft after midnight. Wave Detail: SW 6 ft at 7 seconds and SE 2 ft at 9 seconds, becoming SW 5 ft at 7 seconds and SE 2 ft at 9 seconds. A chance of showers. .THU...NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. .THU NIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. .FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 4 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. $$ ANZ283-181800- Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM- 104 AM EDT Mon May 18 2026 .REST OF TONIGHT...W winds 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: S 4 ft at 7 seconds and E 2 ft at 8 seconds. Patchy fog. Vsby 1 NM or less. .MON...SE winds 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: S 4 ft at 7 seconds and SE 2 ft at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .MON NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 3 ft. Wave Detail: S 3 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog. Vsby 1 NM or less. .TUE...SW winds 15 to 20 kt with gusts up to 25 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 6 seconds and SE 2 ft at 9 seconds. Patchy fog in the morning with vsby 1 NM or less. .TUE NIGHT AND WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 6 ft. Wave Detail: SW 6 ft at 6seconds and SE 2 ft at 9 seconds. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt, becoming NW 10 to 15 kt with gusts up to 20 kt after midnight. Seas 5 to 7 ft, subsiding to 4 to 5 ft after midnight. Wave Detail: SW 6 ft at 7 seconds and SE 2 ft at 9 seconds, becoming SW 5 ft at 7 seconds and SE 2 ft at 9 seconds. A chance of showers. .THU...NE winds 10 to 15 kt. Seas 3 to 4 ft. A chance of showers. .THU NIGHT...E winds 5 to 10 kt. Seas 2 to 3 ft. .FRI AND FRI NIGHT...E winds 5 to 10 kt. Seas 2 to 4 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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