Coastal Waters Forecast
Issued by NWS Boston, MA
Issued by NWS Boston, MA
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184 FZUS51 KBOX 181104 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 704 AM EDT Sat Jul 18 2026 Coastal waters from the Merrimack River MA to Watch Hill RI out to 60 NM ANZ200-190000- 704 AM EDT Sat Jul 18 2026 .Synopsis for Massachusetts and Rhode Island coastal waters... Low pres moving through Quebec will bring gusty southwest winds to near gale fore today, to go along with showers and thunderstorms. High pres then builds in for Sun into Tue. $$ ANZ250-190000- Coastal waters east of Ipswich Bay and the Stellwagen Bank National Marine Sanctuary- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...S winds 5 to 10 kt with gusts up to 20 kt, increasing to 20 to 25 kt with gusts up to 30 kt this afternoon. Seas around 2 ft, building to 3 to 5 ft this afternoon. Wave Detail: S 2 ft at 4 seconds and NW 1 foot at 3 seconds, becoming S 5 ft at 5 seconds and W 2 ft at 4 seconds. Areas of smoke. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: S 5 ft at 6 seconds and E 1 foot at 14 seconds. A chance of showers and tstms. .SUN...W winds 15 to 20 kt, becoming NW 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SE 4 ft at 7 seconds and W 2 ft at 4 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: NW 2 ft at 4 seconds and SE 2 ft at 7 seconds. .MON AND MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and NW 1 foot at 3 seconds. .TUE...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Showers. .WED...S winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ251-190000- Massachusetts Bay and Ipswich Bay- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...S winds 5 to 10 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NW 1 foot at 2 seconds. Areas of smoke. A chance of showers and tstms this afternoon. .TONIGHT...S winds 15 to 20 kt, becoming SW 10 to 15 kt after midnight. Gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at 8 seconds. A chance of showers and tstms in the evening. .SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: W 2 ft at 3 seconds and S 2 ft at 4 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: W 2 ft at 4 seconds and E 1 foot at 8 seconds. .MON AND MON NIGHT...S winds 10 to 15 kt. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and N 1 foot at 4 seconds. .TUE...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 3 seconds and SE 1 foot at 8 seconds. A chance of showers and tstms. .TUE NIGHT AND WED...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Showers with a chance of tstms. .WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. A chance of showers and tstms. 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. $$ ANZ231-190000- Cape Cod Bay- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...SW winds 5 to 10 kt with gusts up to 20 kt, becoming S 15 to 20 kt with gusts up to 30 kt this afternoon. Seas 2 to 4 ft. Wave Detail: W 2 ft at 3 seconds and NE 1 foot at 6 seconds. Areas of smoke. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 3 ft at 4 seconds and E 1 foot at 11 seconds. Showers likely with a chance of tstms. .SUN...W winds 10 to 15 kt, becoming NW 5 to 10 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 3 seconds and SE 1 foot at 9 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas 1 foot or less. Wave Detail: NW 1 foot at 4 seconds and E 1 foot at 8 seconds. .MON...NW winds around 5 kt, becoming SE in the afternoon. Seas 1 foot or less. Wave Detail: N 1 foot at 4 seconds and S 1 foot at 7 seconds. .MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft in the evening, then 1 foot or less. Wave Detail: S 1 foot at 2 seconds and N 1 foot at 5 seconds, becoming S 1 foot at 2 seconds and NW 1 foot at 3 seconds. .TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. Showers with a chance of tstms. .WED...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 2 to 4 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ254-190000- Coastal waters from Provincetown MA to Chatham MA to Nantucket MA out 20 NM- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY EVENING... .TODAY...SW winds 10 to 15 kt, becoming S 15 to 20 kt this afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 4 seconds and NW 1 foot at 3 seconds. Patchy smoke. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: SW 5 ft at 5 seconds and E 1 foot at 8 seconds. A chance of tstms. Showers likely in the evening, then a chance of showers after midnight. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, becoming NW 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 3 to 5 ft. Wave Detail: S 5 ft at 7 seconds and W 2 ft at 4 seconds. .SUN NIGHT...W winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 4 ft. Wave Detail: SE 3 ft at 7 seconds and NW 1 foot at 4 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at 4 seconds. .TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 5 seconds and W 1 foot at 3 seconds. A chance of showers. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 7 ft. Showers with a chance of tstms. .WED...S winds 20 to 25 kt with gusts up to 35 kt. Seas 6 to 9 ft, except 9 to 13 ft S and E of Nantucket. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 9 ft. A chance of showers. 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. $$ ANZ255-190000- Coastal Waters extending out to 25 NM South of Marthas Vineyard and Nantucket- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY EVENING... .TODAY...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. Patchy smoke. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft, building to 5 to 6 ft after midnight. Wave Detail: S 5 ft at 5 seconds and NW 1 foot at 6 seconds, becoming SW 6 ft at 6 seconds and NW 2 ft at 6 seconds. A chance of tstms. Showers in the evening, then a chance of showers after midnight. .SUN...W winds 15 to 20 kt with gusts up to 25 kt, diminishing to 10 to 15 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: W 6 ft at 6 seconds and E 1 foot at 9 seconds. .SUN NIGHT...W winds around 10 kt, becoming NW after midnight. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and NW 1 foot at 3 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and NW 1 foot at 3 seconds. .TUE...SE winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and NW 1 foot at 5 seconds. A chance of showers. .TUE NIGHT...S winds 25 to 30 kt. Seas 5 to 7 ft. Showers with a chance of tstms. .WED...SW winds 25 to 30 kt with gusts up to 35 kt. Seas 9 to 12 ft. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft. Showers likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ256-190000- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 NM South of Block Island- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY EVENING... .TODAY...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 3 seconds and SE 1 foot at 8 seconds. Areas of smoke. Showers likely with a chance of tstms this afternoon with vsby 1 to 3 NM. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: S 6 ft at 5 seconds and NW 3 ft at 5 seconds. A chance of tstms. Showers in the evening, then a chance of showers after midnight. .SUN...W winds 15 to 20 kt, diminishing to 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and NW 2 ft at 4 seconds. .SUN NIGHT...NW winds 10 to 15 kt, becoming N 5 to 10 kt after midnight. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 7 seconds and E 2 ft at 8 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 8 seconds and E 2 ft at 9 seconds. .TUE...SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and NW 1 foot at 5 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Showers with a chance of tstms. .WED...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 8 to 11 ft. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft. A chance of showers. 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. $$ ANZ232-190000- Nantucket Sound- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...SW winds 10 to 15 kt, becoming S 15 to 20 kt this afternoon. Gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 1 foot at 9 seconds. Areas of smoke this morning, then patchy smoke this afternoon. Showers with a chance of tstms this afternoon. .TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 4 ft. Wave Detail: SW 4 ft at 4 seconds and SE 1 foot at 8 seconds. A chance of tstms. Showers in the evening, then a chance of showers after midnight. .SUN...W winds 15 to 20 kt, becoming NW 10 to 15 kt in the afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 7 seconds and W 2 ft at 4 seconds. .SUN NIGHT...W winds 5 to 10 kt, becoming NW after midnight. Seas 2 to 3 ft. Wave Detail: W 1 foot at 3 seconds and S 1 foot at 7 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 4 seconds and NW 1 foot at 3 seconds. .TUE...S winds 15 to 20 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and W 1 foot at 4 seconds. A chance of showers. .TUE NIGHT...S winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Showers with a chance of tstms. .WED...SW winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Showers. .WED NIGHT...SW winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ233-190000- Vineyard Sound- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...SW winds 5 to 10 kt, becoming S around 15 kt this afternoon. Gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 3 seconds and SE 1 foot at 9 seconds. Areas of smoke. Showers with a chance of tstms this afternoon. .TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: S 5 ft at 6 seconds and SE 1 foot at 14 seconds. A chance of tstms. Showers in the evening, then a chance of showers after midnight. .SUN...W winds 10 to 15 kt. Gusts up to 25 kt in the morning. Seas 2 to 4 ft. Wave Detail: W 4 ft at 6 seconds and SE 1 foot at 8 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: W 3 ft at 6 seconds and SE 1 foot at 6 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SW 2 ft at 8 seconds and NW 1 foot at 5 seconds. .TUE...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 6 seconds and SE 1 foot at 9 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Showers with a chance of tstms. .WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. A chance of showers. 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. $$ ANZ234-190000- Buzzards Bay- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...SW winds 10 to 15 kt. Gusts up to 20 kt, increasing to 30 kt this afternoon. Seas 2 to 4 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 7 seconds. Areas of smoke. Showers with a chance of tstms this afternoon. .TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 2 ft at 8 seconds. A chance of tstms. Showers likely in the evening, then a chance of showers after midnight. .SUN...W winds 10 to 15 kt. Gusts up to 25 kt in the morning. Seas 2 to 4 ft. Wave Detail: SW 3 ft at 7 seconds and W 1 foot at 4 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 7 seconds and NW 1 foot at 3 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 6 seconds and SW 2 ft at 6 seconds. .TUE...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 2 ft at 4 seconds and SE 1 foot at 9 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Showers with a chance of tstms. .WED...SW winds 25 to 30 kt with gusts up to 35 kt. Seas 4 to 6 ft. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 3 to 5 ft. Showers likely. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ235-190000- Rhode Island Sound- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. Areas of smoke. Showers likely with a chance of tstms this afternoon with vsby 1 to 3 NM. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 5 seconds and S 3 ft at 8 seconds. A chance of tstms. Showers likely in the evening, then a chance of showers after midnight. .SUN...W winds 10 to 15 kt. Gusts up to 25 kt in the morning. Seas 3 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and SE 2 ft at 8 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: SW 4 ft at 6 seconds and SE 1 foot at 12 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 7 seconds and SE 1 foot at 12 seconds. .TUE...S winds 15 to 20 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and W 1 foot at 5 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Showers with a chance of tstms. .WED...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 7 to 10 ft. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 6 to 9 ft. A chance of showers. 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. $$ ANZ237-190000- Block Island Sound- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...S winds 10 to 15 kt with gusts up to 25 kt. Seas around 2 ft, building to 3 to 4 ft this afternoon. Wave Detail: S 2 ft at 5 seconds and W 1 foot at 2 seconds, becoming SW 3 ft at 4 seconds and SE 1 foot at 8 seconds. Areas of smoke. A slight chance of showers with isolated tstms this morning. Showers with a chance of tstms this afternoon with vsby 1 to 3 NM. .TONIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 3 to 5 ft. Wave Detail: SW 4 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of tstms. Showers likely in the evening, then a chance of showers after midnight. .SUN...W winds 10 to 15 kt. Gusts up to 25 kt in the morning. Seas 2 to 4 ft. Wave Detail: S 4 ft at 7 seconds and W 2 ft at 4 seconds. .SUN NIGHT...NW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at 3 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and NW 1 foot at 3 seconds. .TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Showers with a chance of tstms. .WED...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 8 ft. Showers. .WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Seas 5 to 7 ft. A chance of showers and tstms. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ230-190000- Boston Harbor- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...SW winds 5 to 10 kt, becoming S 15 to 20 kt with gusts up to 30 kt this afternoon. Waves around 2 ft. Areas of smoke. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 30 kt. Waves around 2 ft. A chance of showers and tstms in the evening. .SUN...NW winds 10 to 15 kt with gusts up to 20 kt. Waves around 2 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves 1 foot or less. .MON AND MON NIGHT...SW winds 5 to 10 kt. Waves 1 foot or less. .TUE...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers and tstms. .TUE NIGHT THROUGH WED NIGHT...SW winds 10 to 15 kt with gusts up to 25 kt. Waves 2 to 3 ft. Showers with a chance of tstms. 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. $$ ANZ236-190000- Narragansett Bay- 704 AM EDT Sat Jul 18 2026 ...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM EDT THIS MORNING THROUGH SUNDAY MORNING... .TODAY...S winds 5 to 10 kt, increasing to 10 to 15 kt this afternoon. Gusts up to 25 kt. Waves 2 to 3 ft. Areas of smoke. Showers with a chance of tstms this afternoon with vsby 1 to 3 NM. .TONIGHT...SW winds 15 to 20 kt, diminishing to 10 to 15 kt after midnight. Gusts up to 30 kt. Waves 2 to 3 ft. A chance of tstms. Showers likely in the evening, then a chance of showers after midnight. .SUN...NW winds 10 to 15 kt. Gusts up to 20 kt in the morning. Waves 2 to 3 ft. .SUN NIGHT...NW winds 5 to 10 kt. Waves around 2 ft. .MON AND MON NIGHT...S winds 5 to 10 kt. Waves around 2 ft. .TUE...S winds 10 to 15 kt with gusts up to 20 kt. Waves 2 to 3 ft. A chance of showers and tstms. .TUE NIGHT THROUGH WED NIGHT...SW winds 15 to 20 kt with gusts up to 30 kt. Waves 3 to 5 ft. Showers with a chance of tstms. Winds and waves higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ280-190000- Ocean Waters from the Merrimack River to Plymouth from 40 to 60 NM- 704 AM EDT Sat Jul 18 2026 .TODAY...S winds 10 to 15 kt with gusts up to 20 kt, increasing to 20 to 25 kt with gusts up to 30 kt this afternoon. Seas 2 to 3 ft, building to 4 to 6 ft this afternoon. Wave Detail: S 2 ft at 6 seconds and W 1 foot at 3 seconds, becoming S 6 ft at 5 seconds and W 2 ft at 4 seconds. Areas of smoke this afternoon. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 8 ft. Wave Detail: SW 7 ft at 6 seconds and E 2 ft at 8 seconds. A chance of tstms. A chance of showers in the evening, then showers likely after midnight. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, diminishing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 6 seconds and E 2 ft at 6 seconds. .SUN NIGHT...NW winds 10 to 15 kt with gusts up to 20 kt. Seas 3 to 4 ft. Wave Detail: S 3 ft at 7 seconds and W 2 ft at 4 seconds. .MON AND MON NIGHT...S winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 8 seconds and S 3 ft at 8 seconds. .TUE...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and W 1 foot at 3 seconds. .TUE NIGHT...S winds 15 to 20 kt with gusts up to 30 kt. Seas 4 to 6 ft. Showers with a chance of tstms. .WED...S winds 20 to 25 kt with gusts up to 35 kt. Seas 6 to 9 ft. Showers. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 6 to 9 ft. A chance of showers. 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. $$ ANZ281-190000- Ocean Waters from Provincetown to Nantucket from 20 to 60 NM- 704 AM EDT Sat Jul 18 2026 .TODAY...S winds 10 to 15 kt with gusts up to 20 kt, increasing to 15 to 20 kt with gusts up to 30 kt this afternoon. Seas 2 to 4 ft. Wave Detail: S 4 ft at 5 seconds and NW 1 foot at 4 seconds. Patchy smoke this morning. A chance of showers and tstms this afternoon. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 5 to 7 ft. Wave Detail: SW 6 ft at 5 seconds and SE 1 foot at 8 seconds. A chance of tstms. A chance of showers in the evening, then showers likely after midnight. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, becoming NW 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 7 seconds and NW 3 ft at 4 seconds. .SUN NIGHT...W winds 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: SE 5 ft at 6 seconds and NW 2 ft at 4 seconds. .MON...NW winds 5 to 10 kt, becoming W in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and NW 2 ft at 4 seconds. .MON NIGHT...S winds 5 to 10 kt. Seas around 3 ft. Wave Detail: S 3 ft at 8 seconds and NW 1 foot at 4 seconds. .TUE...SE winds 10 to 15 kt with gusts up to 25 kt. Seas around 3 ft. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 35 kt. Seas 5 to 7 ft. Showers with a chance of tstms. .WED AND WED NIGHT...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 9 to 13 ft. Showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ ANZ282-190000- Ocean Waters from Marthas Vineyard to Nantucket from 25 to 60 NM- 704 AM EDT Sat Jul 18 2026 .TODAY...S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NW 1 foot at 4 seconds. A slight chance of showers with isolated tstms this afternoon. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 4 to 6 ft. Wave Detail: SW 6 ft at 6 seconds and NW 1 foot at 4 seconds. A chance of tstms. A chance of showers in the evening, then showers likely after midnight. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, diminishing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 5 to 7 ft. Wave Detail: SW 7 ft at 7 seconds and NW 1 foot at 4 seconds. .SUN NIGHT...W winds 5 to 10 kt, becoming NW after midnight. Seas 4 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and N 1 foot at 5 seconds. .MON...N winds around 5 kt, becoming E in the afternoon. Seas 3 to 4 ft. Wave Detail: S 4 ft at 8 seconds and NW 1 foot at 4 seconds. .MON NIGHT...SE winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 8 seconds and N 1 foot at 5 seconds. .TUE...SE winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. A chance of showers. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 35 kt. Seas 6 to 9 ft. Showers with a chance of tstms. .WED...SW winds around 25 kt with gusts up to 35 kt. Seas 11 to 15 ft. Showers with a chance of tstms. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 9 to 13 ft. Showers 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. $$ ANZ283-190000- Ocean Waters from Montauk NY to Marthas Vineyard from 25 to 60 NM- 704 AM EDT Sat Jul 18 2026 .TODAY...S winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 4 seconds and NW 2 ft at 4 seconds. Patchy smoke this morning, then areas of smoke this afternoon. A chance of showers and tstms this afternoon with vsby 1 to 3 NM. .TONIGHT...SW winds 20 to 25 kt with gusts up to 30 kt. Seas 3 to 5 ft, building to 5 to 7 ft after midnight. Wave Detail: S 5 ft at 5 seconds and NW 2 ft at 4 seconds, becoming SW 7 ft at 7 seconds and NW 5 ft at 5 seconds. A chance of tstms. Showers in the evening, then a chance of showers after midnight. .SUN...W winds 15 to 20 kt with gusts up to 30 kt, diminishing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas 5 to 7 ft. Wave Detail: W 7 ft at 6 seconds and E 1 foot at 8 seconds. .SUN NIGHT...W winds 10 to 15 kt, becoming NW after midnight. Seas 4 to 5 ft. Wave Detail: SW 5 ft at 7 seconds and NW 1 foot at 4 seconds. .MON AND MON NIGHT...S winds 5 to 10 kt. Seas 2 to 4 ft. Wave Detail: S 4 ft at 8 seconds and N 1 foot at 4 seconds. .TUE...SE winds 10 to 15 kt with gusts up to 25 kt. Seas 2 to 4 ft. Wave Detail: S 3 ft at 7 seconds and NW 1 foot at 4 seconds. A chance of showers and tstms. .TUE NIGHT...S winds 20 to 25 kt with gusts up to 35 kt. Seas 6 to 9 ft. Showers with a chance of tstms. .WED...SW winds around 25 kt with gusts up to 35 kt. Seas 10 to 13 ft. Showers with a chance of tstms. .WED NIGHT...SW winds 20 to 25 kt with gusts up to 35 kt. Seas 8 to 11 ft. A chance of showers. Winds and seas higher in and near tstms. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$ 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