693 FZNT31 KNHC 251512 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1112 AM EDT Sat Sep 25 2021 Marine Weather HF Voice Broadcast for the Tropical N Atlantic from 07N to 22N between 55W and 64W, the SW N Atlantic S of 31N W of 65W including Bahamas, and the Caribbean Sea. Seas given as significant wave height, which is the average height of the highest 1/3 of the waves. Individual waves may be more than twice the significant wave height. Synopsis for Caribbean Sea and Tropical N Atlantic from 07N to 19N between 55W and 64W .SYNOPSIS...Hurricane Sam near 12.9N 47.6W 960 mb at 11 AM EDT moving WNW at 9 kt. Maximum sustained winds 105 kt gusts 130 kt. Sam will move to 13.3N 48.7W this evening, 13.7N 49.8W Sun morning, 14.3N 50.8W Sun evening, 15.0N 51.9W Mon morning, 15.8N 53.0W Mon evening, and 16.6N 54.1W Tue morning. Additional strengthening is expected over the next day or so. Meanwhile, moderate trade winds will persist over much of the Caribbean into early next week, while fresh winds prevail over the south-central Caribbean as high pressure builds east of the Bahamas. NW Caribbean W of 85W .THIS AFTERNOON...E winds 10 kt. Seas 2 ft or less. .TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .SUN...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .SUN NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .MON...E winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .TUE...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft in the afternoon. .TUE NIGHT...E winds 10 to 15 kt. Seas 3 ft in the evening, subsiding to 2 ft or less. .WED...E winds 10 kt. Seas 2 ft or less. Caribbean N of 15N between 72W and 85W .THIS AFTERNOON...E winds 10 to 20 kt S of 18N, and E less than 10 kt elsewhere. Seas 3 ft. .TONIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt elsewhere. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SUN...E winds 10 to 20 kt S of 18N, and NE less than 10 kt elsewhere. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SUN NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .MON...S of 18N, NE winds 10 to 15 kt. Elsewhere, NE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 ft. .TUE...S of 18N, E winds 10 to 15 kt. Elsewhere, NE winds 10 to 15 kt, shifting to E in the afternoon. Seas 2 ft or less. .TUE NIGHT...E winds less than 10 kt. Seas 2 ft or less. .WED...E winds less than 10 kt. Seas 2 ft or less. Caribbean from 11N to 15N W of 72W .THIS AFTERNOON...E winds 10 to 20 kt. Seas 3 to 5 ft. .TONIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 20 kt. Seas 4 to 6 ft. .SUN NIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .MON...NE winds 10 to 20 kt. Seas 4 to 6 ft. .MON NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .WED...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 ft. SW Caribbean S of 11N .THIS AFTERNOON...SE winds less than 10 kt, shifting to N in the afternoon. Seas 2 ft or less. .TONIGHT...N winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 to 4 ft. .SUN...NE winds 10 to 15 kt. Seas 3 to 5 ft. .SUN NIGHT...N winds 10 to 15 kt. Seas 3 to 5 ft. .MON...NE winds 10 to 15 kt. Seas 3 to 5 ft. .MON NIGHT...N winds 10 to 15 kt. Seas 3 to 5 ft. .TUE...NW winds less than 10 kt. Seas 3 to 4 ft. .TUE NIGHT...W winds less than 10 kt. Seas 3 to 4 ft. .WED...W winds less than 10 kt. Seas 3 ft. Caribbean between 64W and 72W .THIS AFTERNOON...E winds 10 to 20 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 20 kt. Seas 3 to 5 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .MON...E winds 10 to 20 kt. Seas 3 to 4 ft. .MON NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .WED...E winds 10 to 15 kt. Seas 3 to 4 ft. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .THIS AFTERNOON...SE winds 10 kt. Seas 4 to 6 ft. .TONIGHT...E winds 10 kt. Seas 4 to 6 ft. .SUN...E winds 10 kt. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 5 to 7 ft. .MON NIGHT...NE winds 15 to 25 kt. Seas 6 to 9 ft. .TUE...NE winds 30 to 40 kt, increasing to 75 to 85 kt in the afternoon. Seas 8 to 13 ft. .TUE NIGHT...NE winds 85 to 95 kt. Seas 10 to 15 ft. .WED...E winds 85 to 95 kt. Seas 10 to 15 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .THIS AFTERNOON...E winds less than 10 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 5 to 7 ft. .MON NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .TUE...SE winds 10 to 20 kt. Seas 5 to 7 ft. .TUE NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .WED...SE winds 10 to 15 kt. Seas 5 to 7 ft. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...A stationary front extends from 31N75W to West Palm Beach, Florida. The front will remain stationary through early Sun, pushing south and eastward as a weak cold front by Sun and reach from 31N69W to 24N80W by Mon morning. The front will stall and dissipate by Wed. Farther east, Hurricane Sam near 12.9N 47.6W 960 mb at 11 AM EDT moving WNW at 9 kt. Maximum sustained winds 105 kt gusts 130 kt. Sam will move to 13.3N 48.7W this evening, 13.7N 49.8W Sun morning, 14.3N 50.8W Sun evening, 15.0N 51.9W Mon morning, 15.8N 53.0W Mon evening, and 16.6N 54.1W Tue morning. Additional strengthening is expected over the next day or so, and will reach near 18.4N 56.5W by early Wed. ATLC waters from 27N to 31N W of 77W .THIS AFTERNOON...N winds 10 to 15 kt. Seas 4 to 5 ft. .TONIGHT...N winds 10 to 15 kt. Seas 4 ft. .SUN...N winds 10 to 15 kt. Seas 4 to 5 ft. .SUN NIGHT...NE winds 10 to 15 kt. Seas 4 to 5 ft. .MON...NE winds 10 to 15 kt. Seas 3 to 4 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...NE winds less than 10 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds less than 10 kt. Seas 3 to 4 ft. .WED...N winds less than 10 kt. Seas 3 to 4 ft. ATLC waters from 27N to 31N between 65W and 77W .THIS AFTERNOON...SW winds less than 10 kt W of 70W, and NE 10 to 15 kt elsewhere. Seas 4 to 5 ft. .TONIGHT...W winds less than 10 kt. Seas 4 to 5 ft. .SUN...W of 70W, NW winds 10 to 15 kt. Elsewhere, N winds less than 10 kt, shifting to W in the afternoon. Seas 4 to 5 ft. .SUN NIGHT...W of 70W, N winds 10 to 15 kt. Elsewhere, NW winds less than 10 kt, shifting to N after midnight. Seas 3 to 5 ft. .MON...NE winds 10 to 15 kt. Seas 3 to 4 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...NE winds 10 to 15 kt W of 70W, and E less than 10 kt elsewhere. Seas 3 to 5 ft. .TUE NIGHT...NE winds 10 to 15 kt W of 70W, and SE less than 10 kt elsewhere. Seas 4 to 6 ft. .WED...NE winds less than 10 kt. Seas 4 to 6 ft. Bahamas N of 22N .THIS AFTERNOON...SE winds less than 10 kt. Seas 2 ft or less. .TONIGHT...NE winds less than 10 kt, shifting to E after midnight. Seas 2 ft or less. .SUN...E winds 10 to 15 kt. Seas 2 ft or less. .SUN NIGHT...NE winds 10 to 20 kt. Seas 2 ft or less, building to 3 ft after midnight. .MON...NE winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...NE winds 10 to 20 kt. Seas 2 ft or less. .TUE...E winds 10 to 15 kt. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 3 ft. .WED...E winds less than 10 kt. Seas 3 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .THIS AFTERNOON...W of 70W, Variable winds less than 10 kt, becoming E less than 10 kt in the afternoon. Elsewhere, NE winds 10 to 15 kt. Seas 4 to 5 ft. .TONIGHT...NE winds less than 10 kt. Seas 4 to 5 ft. .SUN...NE winds less than 10 kt. Seas 4 to 5 ft. .SUN NIGHT...W of 70W, N winds 10 to 15 kt, shifting to NE after midnight. Elsewhere, NE winds less than 10 kt. Seas 3 to 4 ft. .MON...W of 70W, E winds 10 to 15 kt. Elsewhere, E winds less than 10 kt in the morning, becoming variable winds less than 10 kt. Seas 3 to 4 ft. .MON NIGHT...E winds 10 to 15 kt W of 70W, and E less than 10 kt elsewhere. Seas 3 to 4 ft. .TUE...E winds 10 to 15 kt W of 70W, and SE less than 10 kt elsewhere. Seas 3 to 5 ft. .TUE NIGHT...W of 70W, E winds 10 to 15 kt. Elsewhere, E winds less than 10 kt, shifting to SE after midnight. Seas 5 to 7 ft. .WED...W of 70W, SE winds less than 10 kt. Elsewhere, SE winds 10 to 15 kt, shifting to S in the afternoon. Seas 4 to 6 ft W of 70W, and 6 to 9 ft elsewhere. ATLC waters S of 22N W of 65W .THIS AFTERNOON...SE winds less than 10 kt. Seas 3 to 4 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SUN...SE winds less than 10 kt. Seas 3 to 4 ft. .SUN NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .MON...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 5 to 7 ft. ATLC waters from 19N to 22N between 55W and 65W .THIS AFTERNOON...SE winds 10 to 15 kt. Seas 5 to 6 ft. .TONIGHT...E winds less than 10 kt. Seas 5 to 6 ft. .SUN...SE winds less than 10 kt. Seas 4 to 6 ft. .SUN NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 5 to 7 ft. .MON...E winds 10 to 15 kt. Seas 5 to 7 ft. .MON NIGHT...E winds 10 to 20 kt. Seas 6 to 9 ft. .TUE...E winds 20 to 30 kt. Seas 7 to 10 ft. .TUE NIGHT...E winds 20 to 30 kt, increasing to 30 to 40 kt after midnight. Seas 9 to 14 ft. .WED...E winds 55 to 65 kt, increasing to 75 to 95 kt in the afternoon. Seas 13 to 18 ft.