Expires:202512051900;;031174 FZUS51 KBOX 050603 CWFBOX Coastal Waters Forecast for Massachusetts and Rhode Island National Weather Service Boston/Norton MA 103 AM EST Fri Dec 5 2025 Coastal waters from the Merrimack River MA to Watch Hill RI out to 25 NM ANZ256-051900- Coastal Waters from Montauk NY to Marthas Vineyard extending out to 20 nm South of Block Island- 103 AM EST Fri Dec 5 2025 ...SMALL CRAFT ADVISORY IN EFFECT UNTIL 4 AM EST EARLY THIS MORNING... .REST OF TONIGHT...N winds 20 to 25 kt. Seas 4 to 6 ft. Wave Detail: NW 6 ft at 6 seconds and SE 2 ft at 10 seconds. .FRI...NE winds 10 to 15 kt, becoming S around 5 kt in the afternoon. Seas 2 to 4 ft. Wave Detail: NW 3 ft at 5 seconds and E 2 ft at 10 seconds. .FRI NIGHT...SE winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 10 seconds and SW 1 foot at 6 seconds. .SAT...S winds 5 to 10 kt, becoming SW 10 to 15 kt in the afternoon. Seas around 2 ft. Wave Detail: S 2 ft at 3 seconds and SE 2 ft at 10 seconds. A chance of rain. .SAT NIGHT...W winds 10 to 15 kt, becoming NW 15 to 20 kt after midnight. Seas 2 to 3 ft. Wave Detail: SW 3 ft at 4 seconds and SE 2 ft at 9 seconds. .SUN...N winds 10 to 15 kt, becoming NE 5 to 10 kt in the afternoon. Seas 2 to 3 ft. Wave Detail: NW 2 ft at 4 seconds and SE 2 ft at 9 seconds. .SUN NIGHT...S winds 5 to 10 kt, becoming W 20 to 25 kt after midnight. Seas 2 to 4 ft. A chance of rain. .MON...NW winds 25 to 30 kt. Seas 4 to 6 ft. A chance of rain. .MON NIGHT...N winds 25 to 30 kt. Seas 3 to 5 ft. .TUE...W winds 20 to 25 kt. Seas 2 to 4 ft. .TUE NIGHT...SW winds 25 to 30 kt. Seas 5 to 7 ft. A chance of rain. 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. $$