


Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
738 FZMY50 PGUM 191800 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 400 AM ChST Sun Apr 20 2025 Marianas Waters out to 40 nautical miles PMZ150-200900- 400 AM ChST Sun Apr 20 2025 .Synopsis for Marianas Waters...Combined seas of 4 to 6 feet will gradually diminish, reaching 2 to 4 feet this Tuesday as trade winds and swell subside. Light to gentle trades will continue through Thursday. $$ PMZ151>154-200900- MARIANAS COASTAL WATERS- 400 AM ChST Sun Apr 20 2025 .TODAY...East wind 10 kt. Seas 4 to 5 ft. Wave Detail: East 4 ft at 8 seconds, east 2 ft at 4 seconds and northeast 2 ft at 9 seconds. .TONIGHT...East wind 10 kt. Seas 3 to 5 ft. Wave Detail: Northeast 4 ft at 9 seconds and east 2 ft at 4 seconds. Scattered showers. .MONDAY...East wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: Northeast 4 ft at 9 seconds and east 2 ft at 4 seconds. .MONDAY NIGHT...East wind 5 to 10 kt. Seas 3 to 5 ft. Wave Detail: East 3 ft at 8 seconds, east 2 ft at 4 seconds and north 2 ft at 9 seconds. .TUESDAY THROUGH THURSDAY...East wind 10 kt. Seas 3 to 4 ft. Wave Detail: East 3 ft at 8 seconds and east 2 ft at 4 seconds. $$