FZNT26 KNHC 210909 OFFN05 NAVTEX Marine Forecast NWS National Hurricane Center Miami, FL 509 AM EDT Sat Mar 21 2026 ...Please refer to Coastal Waters Forecasts (CWF) available through NOAA Weather Radio and other means for detailed Coastal Waters Forecasts... .SYNOPSIS...The Atlantic ridge extending into the NE Caribbean will shift eastward this weekend allowing a frontal boundary to reach the island by Sun morning. Under this weather pattern, the southerly winds will veer to the N and NE on Sun, and to the NE starting on Sun night as high pressure builds over the western Atlantic in the wake of the front. Moderate to locally fresh winds and moderate seas will prevail through the forecast period. Periods of unsettled weather are also expected this weekend with the proximity of the front. San Juan Atlantic Waters .TODAY...S to SW winds 10 to 15 kt. Seas 6 to 7 ft in E swell. Scattered showers and isolated tstms. .TONIGHT...W to NW winds 10 to 15 kt. Seas 5 to 7 ft. Scattered showers and isolated tstms. .SUN...N winds 10 to 15 kt. Seas 6 to 8 ft in N swell. .SUN NIGHT...NE winds 10 to 15 kt. Seas 6 to 8 ft in N swell. .MON...NE winds 10 to 15 kt. Seas 6 to 7 ft in N swell. .MON NIGHT...NE winds 10 to 15 kt. Seas 5 to 6 ft. .TUE...NE to E winds 10 to 15 kt. Seas 5 to 6 ft. .TUE NIGHT...NE to E winds 15 kt. Seas 5 to 6 ft. .WED...E winds 15 kt. Seas 5 to 6 ft. .WED NIGHT...E winds 15 kt. Seas 5 to 6 ft. San Juan Caribbean Waters .TODAY...SE to S winds 10 to 15 kt. Seas 4 to 5 ft. .TONIGHT...SE to S winds 5 to 10 kt. Seas 3 to 4 ft. Scattered showers and isolated tstms. .SUN...E winds 15 to 20 kt. Seas 3 to 5 ft. Scattered showers and isolated tstms. .SUN NIGHT...NE winds 15 to 20 kt. Seas 4 to 6 ft. .MON...NE winds 10 to 15 kt. Seas 3 to 5 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .TUE...NE to E winds 10 to 15 kt. Seas 3 to 5 ft. .TUE NIGHT...NE to E winds 10 to 15 kt. Seas 3 to 5 ft. .WED...E winds 10 to 15 kt. Seas 4 to 5 ft. .WED NIGHT...E winds 15 kt. Seas 4 to 5 ft.