187 FZUS51 KBOX 201727 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 127 PM EDT Thu May 20 2021 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ200-210600- 127 PM EDT Thu May 20 2021 .Synopsis for Massachusetts and Rhode Island coastal waters... A ridge of high pres will remain anchored near the coast through Fri. The ridge begins to break down this weekend with increased chance for showers. A cold front crosses the waters late Sun before a warm front lifts north on Tue. For additional information on possible hazardous weather for the week ahead, please visit www.weather.gov/boston/ehwo $$ ANZ250-210600- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds 5 to 10 kt with gusts up to 20 kt. Seas around 2 ft. .TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. .FRI...S winds 10 to 15 kt. Gusts up to 20 kt in the afternoon. Seas 2 to 3 ft. .FRI NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 4 to 6 ft. A chance of showers. .SAT AND SAT NIGHT...SW winds 10 to 15 kt with gusts up to 20 kt. Seas 5 to 7 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds 5 to 10 kt, becoming N 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, becoming S around 10 kt. Seas 4 to 7 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-210600- Massachusetts Bay and Ipswich Bay- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds around 10 kt with gusts up to 20 kt. Seas around 2 ft. .TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Seas around 2 ft. .FRI...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. .FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 3 to 5 ft. A chance of showers. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas 4 to 6 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 25 kt. Seas 4 to 6 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt, becoming S. 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. $$ ANZ231-210600- Cape Cod Bay- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...E winds around 10 kt. Seas around 2 ft. .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. .FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. .FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 2 to 3 ft. A chance of showers. .SAT AND SAT NIGHT...SW winds 10 to 15 kt. Seas 2 to 4 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, becoming S around 10 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-210600- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 nm- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...E winds 5 to 10 kt. Seas 2 to 3 ft. .TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 2 to 4 ft. Patchy fog. Vsby 1 to 3 NM. .FRI NIGHT...S winds 10 to 15 kt. Gusts up to 20 kt in the evening. Seas 4 to 7 ft. .SAT AND SAT NIGHT...SW winds 10 to 15 kt. Seas 5 to 7 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds around 10 kt, becoming N 15 to 20 kt with gusts up to 30 kt. Seas 4 to 7 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, becoming S around 10 kt. Seas 4 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. $$ ANZ255-210600- Coastal Waters extending out to 25 nm South of Marthas Vineyard and Nantucket- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...E winds around 10 kt. Seas 2 to 3 ft. .TONIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .FRI...S winds 5 to 10 kt. Seas 2 to 4 ft. Patchy fog. Vsby 1 NM or less. .FRI NIGHT...S winds 5 to 10 kt. Seas 3 to 5 ft. .SAT...SW winds around 10 kt. Seas 4 to 6 ft. .SAT NIGHT...SW winds around 10 kt. Seas 4 to 7 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds around 10 kt, becoming N 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt, becoming SE 10 to 15 kt. Gusts up to 25 kt. Seas 4 to 6 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-210600- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas 2 to 3 ft. .TONIGHT...SE winds around 5 kt. Seas 2 to 3 ft. .FRI...S winds 5 to 10 kt. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .FRI NIGHT...SW winds around 10 kt. Seas 3 to 5 ft. Patchy fog. Vsby 1 to 3 NM. .SAT...SW winds around 10 kt. Seas 4 to 6 ft. .SAT NIGHT...SW winds around 10 kt. Seas 4 to 6 ft. A chance of showers. .SUN...SW winds around 10 kt. Seas 3 to 5 ft. .SUN NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Seas 4 to 5 ft. A chance of showers. .MON AND MON NIGHT...NE winds around 15 kt, becoming SE. Gusts up to 25 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. $$ ANZ232-210600- Nantucket Sound- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...E winds around 10 kt. Seas around 2 ft. .TONIGHT...SE winds around 5 kt. Seas around 2 ft. Patchy fog. Vsby 1 NM or less. .FRI...S winds 5 to 10 kt. Seas around 2 ft. Patchy fog. Vsby 1 to 3 NM. .FRI NIGHT...SW winds around 10 kt. Seas 2 to 4 ft. .SAT AND SAT NIGHT...SW winds around 10 kt. Seas 2 to 4 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds around 10 kt, becoming N 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 15 to 20 kt with gusts up to 25 kt, becoming S around 10 kt. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-210600- Vineyard Sound- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds around 10 kt. Seas around 2 ft. .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. .FRI...S winds 5 to 10 kt. Seas around 2 ft. .FRI NIGHT...SW winds 5 to 10 kt. Seas 2 to 3 ft. .SAT...SW winds around 10 kt. Seas 2 to 3 ft. .SAT NIGHT...SW winds around 10 kt. Seas 2 to 3 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds around 10 kt, becoming N with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...S 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. $$ ANZ234-210600- Buzzards Bay- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds around 10 kt. Seas around 2 ft. .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. .FRI...SW winds 5 to 10 kt, becoming S 10 to 15 kt in the afternoon. Seas around 2 ft. .FRI NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .SUN...SW winds 5 to 10 kt. Seas around 2 ft. A chance of showers. .SUN NIGHT...N winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .MON...NE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. .MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-210600- Rhode Island Sound- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds around 10 kt. Seas around 2 ft. .TONIGHT...S winds 5 to 10 kt. Seas around 2 ft. .FRI...S winds around 5 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 to 3 ft. Patchy fog. Vsby 1 NM or less. .FRI NIGHT...SW winds around 10 kt. Seas 2 to 4 ft. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt, becoming S. 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. $$ ANZ237-210600- Block Island Sound- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds 5 to 10 kt. Seas around 2 ft. .TONIGHT...S winds around 5 kt. Seas around 2 ft. .FRI...SW winds around 5 kt, becoming S 10 to 15 kt in the afternoon. Seas 2 to 3 ft. .FRI NIGHT...SW winds 5 to 10 kt. Seas 2 to 4 ft. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Seas 3 to 5 ft. A chance of showers. .SUN AND SUN NIGHT...SW winds 5 to 10 kt, becoming N 10 to 15 kt with gusts up to 25 kt. Seas 3 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 25 kt, becoming S. Seas 2 to 4 ft. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-210600- Boston Harbor- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...SE winds around 10 kt with gusts up to 20 kt. Waves 1 foot or less. .TONIGHT...S winds 5 to 10 kt. Gusts up to 20 kt in the evening. Waves 1 foot or less. .FRI...S winds 5 to 10 kt, becoming SE 10 to 15 kt in the afternoon. Waves around 2 ft. .FRI NIGHT...S winds around 10 kt. Gusts up to 20 kt in the evening. Waves around 2 ft. A chance of showers. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the outer harbor entrance. A chance of showers. .SUN AND SUN NIGHT...W winds around 5 kt, becoming N 10 to 15 kt with gusts up to 25 kt. Waves 1 foot or less, then around 2 ft. At the outer harbor entrance, waves 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming S 5 to 10 kt. Waves 2 to 3 ft, then 1 foot or less. At the outer harbor entrance, waves 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. $$ ANZ236-210600- Narragansett Bay- 127 PM EDT Thu May 20 2021 .THIS AFTERNOON...S winds around 10 kt. Waves 1 foot or less. .TONIGHT...S winds 5 to 10 kt. Waves 1 foot or less. .FRI...S winds 5 to 10 kt, increasing to 10 to 15 kt in the afternoon. Waves 1 foot or less. .FRI NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the bay entrance. A chance of showers. .SAT AND SAT NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less, except 2 to 4 ft at the bay entrance. A chance of showers. .SUN AND SUN NIGHT...SW winds 5 to 10 kt, becoming N with gusts up to 25 kt. Waves 1 foot or less, then around 2 ft. At the bay entrance, waves 2 to 4 ft. A chance of showers. .MON AND MON NIGHT...NE winds 10 to 15 kt with gusts up to 20 kt, becoming S 5 to 10 kt. Waves around 2 ft, then 1 foot or less. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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