ANZ200-190900-
404 PM EDT Tue Aug 18 2026
.Synopsis for Massachusetts and Rhode Island coastal waters...
Weak high pressure will be moving across the region overnight
and then be offshore by late Wednesday. A weak trough of low
pressure moves through Thursday, followed by yet another high
pressure system for Friday.
$$
ANZ237-190900- Block Island Sound- 404 PM EDT Tue Aug 18 2026 TONIGHT SW winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds. WED SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 1 foot at 4 seconds. WED NIGHT SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and E 1 foot at 6 seconds. Patchy fog after midnight with vsby 1 to 3 NM. THU W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. Patchy fog in the morning with vsby 1 NM or less. THU NIGHT W winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot at 4 seconds. FRI NE winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and W 1 foot at 4 seconds. FRI NIGHT E winds 5 to 10 kt. Seas around 2 ft. A chance of showers after midnight. SAT E winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. SAT NIGHT NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. SUN AND SUN NIGHT SE winds 5 to 10 kt, becoming SW. Seas 2 to 3 ft. A chance of showers. Seas are reported as significant wave height, which is the average of the highest third of the waves. Individual wave heights may be more than twice the significant wave height. $$
ANZ237-190900- Block Island Sound- 404 PM EDT Tue Aug 18 2026 TONIGHT SW winds around 5 kt. Seas 2 to 3 ft. Wave Detail: SE 3 ft at 6 seconds. WED SW winds 5 to 10 kt. Seas 2 to 3 ft. Wave Detail: S 3 ft at 7 seconds and E 1 foot at 4 seconds. WED NIGHT SW winds 5 to 10 kt. Seas around 2 ft. Wave Detail: S 2 ft at 6 seconds and E 1 foot at 6 seconds. Patchy fog after midnight with vsby 1 to 3 NM. THU W winds 5 to 10 kt. Seas around 2 ft. Wave Detail: SE 2 ft at 7 seconds and SW 1 foot at 4 seconds. Patchy fog in the morning with vsby 1 NM or less. THU NIGHT W winds 5 to 10 kt, becoming N after midnight. Seas around 2 ft. Wave Detail: SE 2 ft at 8 seconds and SW 1 foot at 4 seconds. FRI NE winds 5 to 10 kt, becoming E in the afternoon. Seas around 2 ft. Wave Detail: NE 1 foot at 2 seconds and W 1 foot at 4 seconds. FRI NIGHT E winds 5 to 10 kt. Seas around 2 ft. A chance of showers after midnight. SAT E winds 10 to 15 kt. Seas 2 to 3 ft. A chance of showers. SAT NIGHT NE winds 5 to 10 kt. Seas 2 to 3 ft. Showers likely. SUN AND SUN NIGHT SE winds 5 to 10 kt, becoming SW. 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. $$