Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
245 FZMY50 PGUM 040540 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 340 PM ChST Fri Jul 4 2025 Marianas Waters out to 40 nautical miles PMZ150-042300- 340 PM ChST Fri Jul 4 2025 .Synopsis for Marianas Waters...Mainly gentle southeasterlies will prevail through Saturday, 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 as a west to northwest swell emanating from a strengthening tropical cyclone north of the Philippines passes through. $$ PMZ151>154-042300- MARIANAS COASTAL WATERS- 340 PM ChST Fri Jul 4 2025 .TONIGHT...Southeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 9 seconds and southeast 2 ft at 4 seconds. .SATURDAY...Southeast wind 5 to 10 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 9 seconds and southeast 2 ft at 4 seconds. Scattered showers with isolated thunderstorms. .SATURDAY NIGHT...South wind 5 kt. Seas 3 to 4 ft. Wave Detail: East 4 ft at 9 seconds. Scattered showers with isolated thunderstorms. .SUNDAY...Southwest wind 5 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 9 seconds. Scattered showers with isolated thunderstorms. .SUNDAY NIGHT...Southwest wind 5 kt. Seas 3 ft. Wave Detail: East 3 ft at 9 seconds. Scattered showers with isolated thunderstorms. .MONDAY...South to southwest wind 5 to 10 kt. Seas 3 ft. Wave Detail: East 3 ft at 8 seconds and south 2 ft at 4 seconds. Scattered showers with a slight chance of thunderstorms. .TUESDAY THROUGH WEDNESDAY...South wind 10 to 15 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and south 3 ft at 5 seconds. Scattered showers with a slight chance of thunderstorms. $$