Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
852 FZMY50 PGUM 121846 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 446 AM ChST Sun Jul 13 2025 Marianas Waters out to 40 nautical miles PMZ150-130845- 446 AM ChST Sun Jul 13 2025 .Synopsis for Marianas Waters...Moist, southeasterly flow extends across the region as Tropical Storm 06W slowly develops near 25N 142E, north-northwest of the Marianas. This, as well as a monsoon pattern developing in western Micronesia will maintain unsettled weather this week. A short lull in showers is anticipated for tonight and Monday. Gentle to moderate south to southeast winds with occasional fresh to strong gusts near showers and thunderstorms may generate locally higher wind waves at times. Combined seas will be around 4 to 6 feet as the trade swell and southwest swell build slightly. $$ PMZ151>154-130845- MARIANAS COASTAL WATERS- 446 AM ChST Sun Jul 13 2025 .TODAY...Southeast wind 10 to 15 kt. Seas around 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 3 ft at 4 seconds and southwest 2 ft at 8 seconds. Scattered showers with isolated thunderstorms. .TONIGHT...Southeast wind 10 kt. Seas 4 to 6 ft. Wave Detail: East 4 ft at 8 seconds, southeast 2 ft at 4 seconds and southwest 2 ft at 8 seconds. Isolated thunderstorms. .MONDAY...Southeast wind 5 to 10 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 2 ft at 4 seconds and west 2 ft at 8 seconds. Isolated thunderstorms. .MONDAY NIGHT...Southeast wind 10 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 2 ft at 4 seconds and west 2 ft at 8 seconds. Scattered showers with isolated thunderstorms. .TUESDAY THROUGH WEDNESDAY...Southeast wind 5 to 15 kt. Seas 3 to 5 ft. Wave Detail: Southeast 3 ft at 5 seconds, east 3 ft at 8 seconds and west 3 ft at 8 seconds. Scattered showers with a slight chance of thunderstorms. .THURSDAY...Southeast wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: West 4 ft at 9 seconds, east 3 ft at 8 seconds and southeast 2 ft at 4 seconds. A chance of showers with a slight chance of thunderstorms. $$