Coastal Waters Forecast
Issued by NWS Boston, MA

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713 FZUS51 KBOX 231403 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 1003 AM EDT Thu May 23 2024 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-240300- 1003 AM EDT Thu May 23 2024 .Synopsis for Massachusetts and Rhode Island coastal waters... A cold front slides into southern New England late today and across the waters by late tonight into early Fri. The front will bring showers and thunderstorms. Hit or miss showers and storms are possible through the weekend with a front nearby. A frontal system lifts toward the waters early next week. $$ ANZ250-240300- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 2 ft at 8 seconds. A slight chance of tstms. A slight chance of showers, then a chance of showers with vsby 1 to 3 NM. .TONIGHT...SW winds 10 to 15 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at 3 seconds and E 1 foot at 8 seconds. .FRI NIGHT...W winds 10 to 15 kt, becoming NW 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 9 seconds. .SAT AND SAT NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and E 1 foot at 9 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 1 foot at 9 seconds. .MON...SE winds 10 to 15 kt. Seas 2 to 3 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Rain likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-240300- Massachusetts Bay and Ipswich Bay- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 7 seconds. A chance of showers with a slight chance of tstms. .TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 3 seconds and E 1 foot at 7 seconds. Patchy fog. Vsby 1 to 3 NM. .FRI...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: W 1 foot at 2 seconds and E 1 foot at 7 seconds. .FRI NIGHT...W winds around 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: W 1 foot at 3 seconds and E 1 foot at 9 seconds. .SAT...N winds around 5 kt, becoming SE 10 to 15 kt in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: NW 1 foot at 2 seconds and E 1 foot at 8 seconds, becoming SE 1 foot at 2 seconds and E 1 foot at 7 seconds. .SAT NIGHT...S winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 3 seconds and E 1 foot at 8 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. .MON...SE winds 10 to 15 kt. Seas 2 to 3 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt. Seas 2 to 3 ft. Rain likely. Winds and seas higher in and near tstms. 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. $$ ANZ231-240300- Cape Cod Bay- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 8 seconds. A chance of showers with a slight chance of tstms. Vsby 1 to 3 NM. .TONIGHT...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 3 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...SW winds around 10 kt, becoming NW after midnight. Seas 1 foot or less. Wave Detail: SW 1 foot at 2 seconds and E 1 foot at 8 seconds. .SAT...N winds around 5 kt, becoming SE in the afternoon. Seas 1 foot or less. Wave Detail: NW 1 foot at 3 seconds and E 1 foot at 8 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 2 seconds and E 1 foot at 6 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. .MON...SE winds 5 to 10 kt. Seas around 2 ft. A chance of rain. .MON NIGHT...SE winds around 10 kt. Seas around 2 ft. Rain likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-240300- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 2 ft at 8 seconds. A slight chance of tstms. A slight chance of showers, then a chance of showers. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt, becoming NW 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 seconds. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 5 seconds and E 1 foot at 9 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 9 seconds. .MON...SE winds 5 to 10 kt. Seas 2 to 3 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Rain likely. Winds and seas higher in and near tstms. 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. $$ ANZ255-240300- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds around 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and E 2 ft at 8 seconds. A chance of showers with a slight chance of tstms. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .FRI NIGHT...SW winds around 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 9 seconds. Patchy fog in the evening with vsby 1 to 3 NM. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 9 seconds. .SUN AND SUN NIGHT...S winds around 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and SE 2 ft at 9 seconds. .MON...SE winds 10 to 15 kt. Seas 2 to 3 ft. A chance of rain. .MON NIGHT...SE winds around 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Rain likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-240300- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and E 2 ft at 8 seconds. A chance of showers with a slight chance of tstms. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and E 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less, increasing to 1 to 3 NM in the afternoon. .FRI NIGHT...SW winds 10 to 15 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the evening with vsby 1 to 3 NM. .SAT...NE winds around 5 kt, becoming SE in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at 9 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas around 2 ft. .MON...SE winds 10 to 15 kt. Seas 2 to 3 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Rain likely. Winds and seas higher in and near tstms. 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. $$ ANZ232-240300- Nantucket Sound- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 7 seconds. A chance of showers with a slight chance of tstms. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt with gusts up to 20 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and E 1 foot at 7 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 1 foot at 4 seconds and E 1 foot at 7 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...SW winds 10 to 15 kt, becoming NW 5 to 10 kt after midnight. Seas 1 foot or less. Wave Detail: SW 1 foot at 3 seconds and SE 1 foot at 8 seconds. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: W 1 foot at 4 seconds and E 1 foot at 8 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 3 seconds and SE 1 foot at 8 seconds. .MON...SE winds 10 to 15 kt. Seas around 2 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Rain likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-240300- Vineyard Sound- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers with a slight chance of tstms. Vsby 1 to 3 NM. .TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft in the afternoon. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at 8 seconds, becoming SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...SW winds around 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at 9 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 4 seconds and SE 1 foot at 8 seconds. .MON...SE winds 10 to 15 kt. Seas around 2 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Rain likely. Winds and seas higher in and near tstms. 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. $$ ANZ234-240300- Buzzards Bay- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers with a slight chance of tstms, then showers likely with a chance of tstms. Vsby 1 to 3 NM. .TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas 1 foot or less. Wave Detail: SW 1 foot at 4 seconds and SE 1 foot at 8 seconds. .SAT AND SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: SW 1 foot at 5 seconds and SE 1 foot at 8 seconds. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 4 seconds and SE 1 foot at 8 seconds. .MON...SE winds 10 to 15 kt. Seas 1 foot or less. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt. Seas around 2 ft. Rain likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-240300- Rhode Island Sound- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds 10 to 15 kt. Gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers with a slight chance of tstms. Vsby 1 NM or less. .TONIGHT...SW winds 10 to 15 kt, diminishing to 5 to 10 kt after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...SW winds around 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. .SAT...E winds around 5 kt, becoming S in the afternoon. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at 9 seconds, becoming S 1 foot at 5 seconds and SE 1 foot at 9 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at 9 seconds. A chance of showers. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft. .MON...SE winds 10 to 15 kt. Seas around 2 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 4 ft. Rain likely. Winds and seas higher in and near tstms. 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. $$ ANZ237-240300- Block Island Sound- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds around 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers with a slight chance of tstms. Vsby 1 to 3 NM, decreasing to 1 NM or less. .TONIGHT...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy fog in the morning with vsby 1 NM or less. .FRI NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Seas around 2 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 8 seconds. .SAT...E winds around 5 kt, becoming S in the afternoon. Seas around 2 ft in the morning, then 1 foot or less. Wave Detail: S 2 ft at 5 seconds and SE 1 foot at 9 seconds, becoming S 1 foot at 5 seconds and SE 1 foot at 9 seconds. .SAT NIGHT...S winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: S 1 foot at 5 seconds and SE 1 foot at 9 seconds. A chance of showers. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Seas 1 foot or less, then around 2 ft. .MON...SE winds 5 to 10 kt. Seas around 2 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt. Seas 2 to 4 ft. Rain likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-240300- Boston Harbor- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds around 10 kt. Waves 1 foot or less. A chance of showers with a slight chance of tstms, then showers likely with a chance of tstms. .TONIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .FRI...W winds 5 to 10 kt. Waves 1 foot or less. .FRI NIGHT...W winds 5 to 10 kt, becoming NW after midnight. Waves 1 foot or less. .SAT...N winds around 5 kt, becoming SE in the afternoon. Waves 1 foot or less. .SAT NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. A chance of showers after midnight. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. .MON...SE winds 10 to 15 kt. Waves around 2 ft. A chance of rain. .MON NIGHT...SE winds 10 to 15 kt. Waves 2 to 3 ft. Rain likely. Winds and waves higher in and near tstms. 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. $$ ANZ236-240300- Narragansett Bay- 1003 AM EDT Thu May 23 2024 .THIS AFTERNOON...SW winds around 10 kt. Waves around 2 ft. Showers likely with a chance of tstms. Vsby 1 to 3 NM. .TONIGHT...SW winds 5 to 10 kt. Waves around 2 ft. Patchy fog. Vsby 1 NM or less. .FRI...SW winds 5 to 10 kt. Waves 1 foot or less. Patchy fog in the morning with vsby 1 to 3 NM. .FRI NIGHT...SW winds 5 to 10 kt, becoming NW after midnight. Waves around 2 ft. .SAT...NE winds around 5 kt, becoming S in the afternoon. Waves 1 foot or less. .SAT NIGHT...S winds 5 to 10 kt. Waves 1 foot or less. A chance of showers. .SUN AND SUN NIGHT...S winds 5 to 10 kt. Waves 1 foot or less, then around 2 ft. .MON...SE winds 5 to 10 kt. Waves around 2 ft. A chance of rain. .MON NIGHT...SE winds around 10 kt. Waves 2 to 3 ft. Rain likely. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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