Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
530 FZMY50 PGUM 181842 CCA CWFGUM Coastal Waters Forecast for the Mariana Islands...CORRECTED National Weather Service Tiyan GU 442 AM ChST Sat Jul 19 2025 Marianas Waters out to 40 nautical miles PMZ150-191000- 442 AM ChST Sat Jul 19 2025 .Synopsis for Marianas Waters...Gentle to moderate trade winds will continue across the region through the beginning of next week. Combined seas of 4 to 6 feet may increase a foot next week depending on the development of west-southwest swell in the region. Convergence in the trade-wind pattern and the TUTT to the west, maintains scattered to numerous showers today with gusts to 25 kt near heavier showers. Then, scattered showers and isolated thunderstorms within light to moderate east-southeast trades are expected through the middle of next week. $$ PMZ151>154-191000- MARIANAS COASTAL WATERS- 442 AM ChST Sat Jul 19 2025 Corrected seas heights today and tonight. .TODAY...East wind 5 to 15 kt with gusts to 25 kt near showers. Seas 4 to 6 ft. Wave Detail: East 5 ft at 8 seconds and east 3 ft at 4 seconds. Numerous showers across Guam. Scattered showers across the CNMI. Isolated thunderstorms. Locally heavy showers possible. .TONIGHT...East wind 5 to 10 kt. Seas around 5 ft. Wave Detail: East 5 ft at 8 seconds, west 2 ft at 9 seconds and east 2 ft at 4 seconds. Scattered showers with isolated thunderstorms. .SUNDAY...Southeast wind 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, west 2 ft at 9 seconds and southeast 2 ft at 4 seconds. Scattered showers with isolated thunderstorms. .SUNDAY NIGHT...Southeast wind 10 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 2 ft at 4 seconds and west 2 ft at 9 seconds. Scattered showers with isolated thunderstorms. .MONDAY...Southeast wind 5 to 15 kt. Seas 3 to 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 3 ft at 4 seconds and southwest 2 ft at 9 seconds. Scattered showers with a slight chance of thunderstorms. .TUESDAY AND WEDNESDAY...East wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: East 5 ft at 9 seconds, east 2 ft at 4 seconds and southwest 2 ft at 9 seconds. A slight chance of thunderstorms. $$