FZMY50 PGUM 060620 CWFGUM Coastal Waters Forecast for the Mariana Islands National Weather Service Tiyan GU 420 PM ChST Wed May 6 2026 Marianas Waters out to 40 nautical miles PMZ150-062230- 420 PM ChST Wed May 6 2026 .Synopsis for Marianas Waters... High pressure north of the region and a strengthening Tropical Storm 05W to the south will bring mostly fresh trade winds tonight through Thursday afternoon before easing slightly to moderate to fresh. This will maintain combined seas around 8 to 10 feet, and a Small Craft Advisory remains in effect through Thursday afternoon. Additionally, light south-southwest swell will build by a foot or two through Thursday night as 05W strengthens south of the Marianas. $$ PMZ151-152-062230- Guam Coastal Waters-Rota Coastal Waters- 420 PM ChST Wed May 6 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .TONIGHT...East wind 20 kt with gusts to 30 kt. Seas 8 to 10 ft. Wave Detail: East 9 ft at 9 seconds and east 5 ft at 7 seconds. Scattered showers. .THURSDAY...East wind 20 kt with gusts to 30 kt. Seas 8 to 10 ft. Wave Detail: East 8 ft at 9 seconds, east 5 ft at 6 seconds and southeast 2 ft at 8 seconds. .THURSDAY NIGHT...East wind 20 kt. Seas 7 to 9 ft. Wave Detail: East 7 ft at 9 seconds, east 5 ft at 7 seconds and southeast 3 ft at 8 seconds. Scattered showers. .FRIDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail: East 7 ft at 9 seconds, east 4 ft at 6 seconds and south 3 ft at 8 seconds. Scattered showers. .FRIDAY NIGHT...East wind 15 to 20 kt. Seas 6 to 8 ft. Wave Detail: East 7 ft at 9 seconds, east 4 ft at 6 seconds and south 3 ft at 8 seconds. .SATURDAY AND SUNDAY...East wind 10 to 20 kt. Seas 6 to 8 ft. Wave Detail: East 7 ft at 9 seconds and east 4 ft at 6 seconds. .MONDAY...East wind 15 kt. Seas 7 to 8 ft. Wave Detail: East 8 ft at 9 seconds and east 3 ft at 5 seconds. $$ PMZ153-154-062230- Tinian Coastal Waters-Saipan Coastal Waters- 420 PM ChST Wed May 6 2026 ...SMALL CRAFT ADVISORY IN EFFECT THROUGH THURSDAY AFTERNOON... .TONIGHT...East wind 20 kt with gusts to 30 kt. Seas 8 to 10 ft. Wave Detail: East 9 ft at 9 seconds and east 5 ft at 7 seconds. .THURSDAY...East wind 20 kt with gusts to 30 kt. Seas 7 to 10 ft. Wave Detail: East 8 ft at 9 seconds, east 5 ft at 7 seconds and southeast 2 ft at 8 seconds. Scattered showers. .THURSDAY NIGHT...East wind 20 kt. Seas 7 to 9 ft. Wave Detail: East 7 ft at 9 seconds, east 5 ft at 7 seconds and southeast 3 ft at 8 seconds. .FRIDAY...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail: East 7 ft at 9 seconds, east 4 ft at 6 seconds and south 3 ft at 8 seconds. .FRIDAY NIGHT...East wind 15 to 20 kt. Seas 7 to 9 ft. Wave Detail: East 7 ft at 9 seconds, east 4 ft at 6 seconds and south 3 ft at 8 seconds. .SATURDAY THROUGH 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. $$