FZMY50 PGUM 141852 CCA CWFGUM Coastal Waters Forecast for the Mariana Islands...CORRECTED National Weather Service Tiyan GU 452 AM ChST Wed Apr 15 2026 Marianas Waters out to 40 nautical miles PMZ150-150830- 452 AM ChST Wed Apr 15 2026 Corrected Wednesday night to tonight. .Synopsis for Marianas Waters... The eye of Typhoon Sinlaku is starting move away from Tinian and Saipan to the northwest. Due to the large wind field around the system, life threatening marine conditions will persist through at least Thursday for Guam and Rota, and early Thursday night for Tinian and Saipan. In addition to winds, Sinlaku will produce Heavy showers and thunderstorms through tonight. Combined seas are expected to be around 18 to 26 ft for Guam, 20 to 30 feet for Rota, and 30 to 40 feet for Tinian and Saipan through Wednesday as Sinlaku moves through. $$ PMZ151-150830- Guam Coastal Waters- 452 AM ChST Wed Apr 15 2026 ...TROPICAL STORM WARNING IN EFFECT... .TODAY...West tropical storm force wind to 45 kt with gusts to 65 kt. Seas 20 to 24 ft. Numerous showers with isolated thunderstorms. .TONIGHT...Southwest tropical storm force wind to 35 kt with gusts to 50 kt. Seas 16 to 19 ft. Scattered showers with isolated thunderstorms. .THURSDAY...Southwest wind 30 kt with gusts to 45 kt. Seas 13 to 16 ft. Scattered showers with isolated thunderstorms. .THURSDAY NIGHT...Southwest wind 20 to 25 kt with gusts to 35 kt. Seas 11 to 14 ft. Isolated thunderstorms early in the evening. .FRIDAY...West wind 15 to 20 kt. Seas 9 to 12 ft. Wave Detail: Northwest 11 ft at 10 seconds and west 4 ft at 6 seconds. .SATURDAY...Southwest wind 10 to 15 kt. Seas 6 to 8 ft. Wave Detail: Northwest 8 ft at 10 seconds and west 3 ft at 4 seconds. .SUNDAY...Southwest wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail: North 7 ft at 10 seconds. $$ PMZ152-150830- Rota Coastal Waters- 452 AM ChST Wed Apr 15 2026 ...TYPHOON WARNING IN EFFECT... .TODAY...West tropical storm force wind to 60 kt, backing to southwest tropical storm force wind to 55 kt. Gusts up to 90 kt, decreasing to 75 kt. Seas 27 to 31 ft, subsiding to 25 to 29 ft. Isolated thunderstorms. Numerous heavy showers until afternoon, then scattered showers late. Visibility 1 NM or less until afternoon. .TONIGHT...Southwest tropical storm force wind to 45 kt with gusts to 65 kt. Seas 19 to 23 ft. Scattered showers with isolated thunderstorms. .THURSDAY...Southwest tropical storm force wind to 35 kt with gusts to 50 kt. Seas 16 to 19 ft. Scattered showers with isolated thunderstorms. .THURSDAY NIGHT...Southwest wind 20 to 25 kt with gusts to 40 kt. Seas 13 to 16 ft. Scattered showers in the evening. Isolated thunderstorms until early morning. .FRIDAY...Southwest wind 15 to 25 kt. Seas 9 to 12 ft. Wave Detail: Northwest 11 ft at 10 seconds and southwest 5 ft at 6 seconds. .SATURDAY...Southwest wind 10 to 15 kt. Seas 7 to 9 ft. Wave Detail: Northwest 9 ft at 10 seconds and southwest 3 ft at 5 seconds. .SUNDAY...Southwest wind 5 to 10 kt. Seas 5 to 7 ft. Wave Detail: North 7 ft at 10 seconds. $$ PMZ153-154-150830- Tinian Coastal Waters-Saipan Coastal Waters- 452 AM ChST Wed Apr 15 2026 ...TYPHOON WARNING IN EFFECT... .TODAY...South typhoon force wind to 95 kt with gusts to 125 kt. Seas 32 to 36 ft, subsiding to 30 to 40 ft. Scattered thunderstorms early this morning. Torrential rain. Isolated thunderstorms this afternoon. Visibility 1 NM or less. .TONIGHT...Southwest tropical storm force wind to 55 kt with gusts to 80 kt. Seas 24 to 28 ft. Isolated thunderstorms. Numerous heavy showers in the evening, then scattered showers after midnight. Visibility 1 NM or less until early morning. .THURSDAY...Southwest tropical storm force wind to 40 kt with gusts to 60 kt. Seas 18 to 22 ft. Scattered showers with isolated thunderstorms. .THURSDAY NIGHT...Southwest tropical storm force wind to 35 kt with gusts to 50 kt. Seas 15 to 18 ft. Scattered showers with isolated thunderstorms. .FRIDAY...Southwest wind 15 to 25 kt. Seas 11 to 14 ft. Scattered showers. .SATURDAY...Southwest wind 10 to 15 kt. Seas 7 to 9 ft. Wave Detail: Northwest 9 ft at 9 seconds and southwest 3 ft at 5 seconds. .SUNDAY...Southwest wind 10 kt. Seas 6 to 8 ft. Wave Detail: North 7 ft at 11 seconds. $$