


Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
764 FZMY50 PGUM 041811 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 411 AM ChST Sat Jul 5 2025 Marianas Waters out to 40 nautical miles PMZ150-051000- 411 AM ChST Sat Jul 5 2025 .Synopsis for Marianas Waters...Mainly gentle southeasterlies will prevail through today, then becoming light from the south and southwest for the rest of the weekend. Winds will begin to pick up next week as high pressure ridge shifts east and the southerly monsoon flow increases, with winds becoming gentle to moderate by midweek. Combined seas of 3 to 4 feet are expected through midweek, possibly increasing late next week due to a west to northwest swell emanating from a distant tropical cyclone north of the Philippines. $$ PMZ151>154-051000- MARIANAS COASTAL WATERS- 411 AM ChST Sat Jul 5 2025 .TODAY...Southeast wind 5 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 9 seconds. Isolated thunderstorms. .TONIGHT...South wind 5 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 9 seconds. Isolated thunderstorms. .SUNDAY...Southwest wind 5 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 9 seconds. Scattered showers with isolated thunderstorms. .SUNDAY NIGHT...Southwest wind 5 kt. Seas around 3 ft. Wave Detail: East 3 ft at 9 seconds. Scattered showers with isolated thunderstorms. .MONDAY THROUGH WEDNESDAY...South wind 5 to 10 kt. Seas around 3 ft. Wave Detail: East 3 ft at 8 seconds and south 2 ft at 4 seconds. Scattered showers with a slight chance of thunderstorms. $$