


Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
996 FZMY50 PGUM 040644 CCA CWFGUM Coastal Waters Forecast for the Mariana Islands...CORRECTED National Weather Service Tiyan GU 444 PM ChST Sat Oct 4 2025 Marianas Waters out to 40 nautical miles PMZ150-042045- 444 PM ChST Sat Oct 4 2025 CORRECTED SUNDAY NIGHT TO HAVE SCATTERED SHOWERS .Synopsis for Marianas Waters...Combined seas of 2 to 4 feet and light to gentle winds are expected through at least Wednesday. An approaching TUTT cell will increase the risk of thunderstorms over the waters over the next couple of days. $$ PMZ151>154-042045- MARIANAS COASTAL WATERS- 444 PM ChST Sat Oct 4 2025 .TONIGHT...Southwest wind 5 kt. Seas around 3 ft. Wave Detail: Northeast 3 ft at 8 seconds. Isolated thunderstorms. .SUNDAY...Southwest wind 5 kt. Seas around 3 ft. Wave Detail: Northeast 3 ft at 8 seconds. Isolated thunderstorms. .SUNDAY NIGHT...Southeast wind 10 kt. Seas around 3 ft. Wave Detail: East 3 ft at 8 seconds and southeast 2 ft at 4 seconds. Scattered showers and isolated thunderstorms. .MONDAY...Southeast wind 10 kt. Seas around 3 ft. Wave Detail: East 3 ft at 8 seconds and southeast 2 ft at 4 seconds. Scattered showers with isolated thunderstorms. .MONDAY NIGHT...East wind 5 to 15 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 4 seconds and east 3 ft at 8 seconds. Scattered showers with isolated thunderstorms. .TUESDAY...Southeast wind 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: Southeast 3 ft at 4 seconds and east 3 ft at 8 seconds. A chance of showers with a slight chance of thunderstorms. .WEDNESDAY THROUGH THURSDAY...Northeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and southeast 2 ft at 4 seconds. A slight chance of thunderstorms. $$