


Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
021 FZMY50 PGUM 091804 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 404 AM ChST Sun Aug 10 2025 Marianas Waters out to 40 nautical miles PMZ150-101000- 404 AM ChST Sun Aug 10 2025 .Synopsis for Marianas Waters...Light to gentle winds and combined seas of 3 to 4 feet are expected through next week. An upper-level low may produce isolated thunderstorms through tonight. $$ PMZ151>154-101000- MARIANAS COASTAL WATERS- 404 AM ChST Sun Aug 10 2025 .TODAY...East wind 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and east 3 ft at 4 seconds. Isolated thunderstorms. .TONIGHT...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds. Isolated thunderstorms. .MONDAY...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 8 seconds and east 2 ft at 4 seconds. .MONDAY NIGHT...East wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 8 seconds and east 2 ft at 4 seconds. .TUESDAY THROUGH THURSDAY...East wind 5 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds. $$