


Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
763 FZMY50 PGUM 061800 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 400 AM ChST Mon Jul 7 2025 Marianas Waters out to 40 nautical miles PMZ150-070945- 400 AM ChST Mon Jul 7 2025 .Synopsis for Marianas Waters...Gentle to moderate southwesterlies will prevail the next few days. Winds will slowly pick up in the first half of the week as the high pressure ridge shifts east and the southerly flow increases, with winds becoming gentle to moderate on Tuesday, then decreasing slightly beginning Wednesday. Combined seas of around 3 feet are expected for most of the week, possibly increasing late week or the weekend as a west-northwest swell emanating from a distant tropical disturbance to our northwest arrives. $$ PMZ151>154-070945- MARIANAS COASTAL WATERS- 400 AM ChST Mon Jul 7 2025 .TODAY...Southwest wind 5 to 10 kt. Seas around 3 ft. Wave Detail: East 3 ft at 8 seconds and southwest 2 ft at 4 seconds. Scattered showers and thunderstorms. .TONIGHT...Southwest wind 5 to 15 kt with gusts to 25 kt near heavier showers. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and southwest 3 ft at 5 seconds. Scattered showers with isolated thunderstorms. .TUESDAY...South wind 5 to 15 kt. Seas around 3 ft. Wave Detail: South 3 ft at 5 seconds and east 2 ft at 8 seconds. Scattered showers with isolated thunderstorms. .TUESDAY NIGHT...South wind 10 to 15 kt. Seas around 3 ft. Wave Detail: South 3 ft at 5 seconds and east 2 ft at 8 seconds. Scattered showers with isolated thunderstorms. .WEDNESDAY THROUGH FRIDAY...Southeast wind 5 to 10 kt. Seas around 3 ft. Wave Detail: East 3 ft at 8 seconds and southeast 2 ft at 4 seconds. Scattered showers with a slight chance of thunderstorms. $$