Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
438 FZMY50 PGUM 130632 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 432 PM ChST Sun Jul 13 2025 Marianas Waters out to 40 nautical miles PMZ150-132200- 432 PM ChST Sun Jul 13 2025 .Synopsis for Marianas Waters...As the feeder bands/monsoon tail extending from Tropical Storm Nari (06W) continue to be pulled northward by TS Nari, the potential for showers and thunderstorms will decrease tonight through Tuesday. Gentle to moderate southeast winds will continue across the region for most of the week, with seas of 4 to 6 feet building to 5 to 7 feet by Thursday as the westerly swell builds. A TUTT cell near Wake Island will near the Marianas later this week, increasing the potential for thunderstorms. Around the same time the monsoon trough in western Micronesia will lift north-northwest, increasing the potential for showers across the region. $$ PMZ151>154-132200- MARIANAS COASTAL WATERS- 432 PM ChST Sun Jul 13 2025 .TONIGHT...Southeast wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: East 5 ft at 8 seconds, southeast 3 ft at 4 seconds and southwest 2 ft at 8 seconds. Isolated thunderstorms. .MONDAY...Southeast wind 10 kt. Seas 4 to 6 ft. Wave Detail: East 5 ft at 9 seconds, southeast 2 ft at 4 seconds and west 2 ft at 8 seconds. .MONDAY NIGHT...Southeast wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: East 5 ft at 9 seconds, southeast 3 ft at 4 seconds and west 2 ft at 8 seconds. .TUESDAY...Southeast wind 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 3 ft at 5 seconds and west 3 ft at 8 seconds. .TUESDAY NIGHT...Southeast wind 10 to 15 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, southeast 3 ft at 4 seconds and west 3 ft at 8 seconds. .WEDNESDAY...East wind 10 to 15 kt. Seas 4 to 6 ft. Wave Detail: East 5 ft at 8 seconds, west 3 ft at 8 seconds and southeast 2 ft at 4 seconds. A chance of showers with a slight chance of thunderstorms. .THURSDAY THROUGH FRIDAY...Southeast wind 10 to 15 kt. Seas 5 to 7 ft. Wave Detail: East 4 ft at 8 seconds, west 4 ft at 8 seconds and east 3 ft at 4 seconds. A chance of showers with a slight chance of thunderstorms. $$