Coastal Waters Forecast
Issued by NWS Tiyan, Guam
Issued by NWS Tiyan, Guam
413 FZMY50 PGUM 220652 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 452 PM ChST Sat Nov 22 2025 Marianas Waters out to 40 nautical miles PMZ150-222130- 452 PM ChST Sat Nov 22 2025 .Synopsis for Marianas Waters... Moderate to fresh trade winds will prevail across the region through at least the middle of next week. Altimetry and buoy data indicate combined seas have tapered to 7 to 9 feet over coastal waters, just below conditions hazardous to small craft, and the Small Craft Advisory will be allowed to expire later this afternoon. However, seas will be choppy, remaining around 7 to 9 feet for at least the next few days as elevated trade swell and localized wind waves persist. A slight increase in winds and gusts Sunday will contribute to additional choppiness. $$ PMZ151>154-222130- MARIANAS COASTAL WATERS- 452 PM ChST Sat Nov 22 2025 ...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 6 PM CHST THIS EVENING... .TONIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail: East 8 ft at 9 seconds and east 4 ft at 6 seconds. .SUNDAY...East wind 15 to 20 kt with occasional gusts to 30 kt. Seas 7 to 9 ft. Wave Detail: East 8 ft at 9 seconds and east 5 ft at 6 seconds. .SUNDAY NIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail: East 8 ft at 9 seconds and east 4 ft at 6 seconds. .MONDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail: East 8 ft at 9 seconds and east 4 ft at 6 seconds. .MONDAY NIGHT...East wind 15 to 20 kt. Seas 7 to 8 ft. Wave Detail: East 7 ft at 9 seconds and east 4 ft at 6 seconds. .TUESDAY...East wind 15 kt. Seas 6 to 8 ft. Wave Detail: East 7 ft at 9 seconds and east 3 ft at 5 seconds. .WEDNESDAY...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail: East 7 ft at 9 seconds and east 4 ft at 6 seconds. .THURSDAY...East wind 15 kt. Seas 6 to 8 ft. Wave Detail: East 7 ft at 8 seconds and east 3 ft at 5 seconds. $$