403 FZNT31 KNHC 250309 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1109 PM EDT Fri Sep 24 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 12.4N 45.9W 982 mb at 11 PM EDT moving WNW at 12 kt. Maximum sustained winds 85 kt gusts 105 kt. Sam will move to 12.7N 47.4W Sat morning, 13.1N 48.8W Sat evening, 13.5N 50.0W Sun morning, 14.1N 51.2W Sun evening, 14.8N 52.4W Mon morning, and 15.7N 53.5W Mon evening. Sam will change little in intensity as it moves to 17.4N 55.8W by late Tue. Meanwhile, moderate trade winds will persist over much of the Caribbean into early next week, becoming fresh over the south- central Caribbean starting tonight as high pressure builds east of the Bahamas. NW Caribbean W of 85W .OVERNIGHT...E winds 10 kt. Seas 2 ft or less. .SAT...E winds less than 10 kt. Seas 2 ft or less. .SAT NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .SUN...E winds 10 to 15 kt. 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, diminishing to less than 10 kt in the afternoon. 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, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .WED...E winds 10 to 15 kt. Seas 2 ft or less. Caribbean N of 15N between 72W and 85W .OVERNIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt elsewhere. Seas 2 ft or less. .SAT...E winds 10 to 20 kt S of 18N, and E less than 10 kt elsewhere. Seas 2 ft or less. .SAT NIGHT...S of 18N, E winds 10 to 15 kt,Seas 2 ft or less, building to 5 ft after midnight. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt after midnight,Seas 2 ft or less. .SUN...E winds 10 to 20 kt S of 18N, and NE less than 10 kt elsewhere. Seas 5 ft S of 18N, and 2 ft or less elsewhere. .SUN NIGHT...NE winds 10 to 15 kt. S of 18N, seas 5 ft in the evening, subsiding to 2 ft or less. Elsewhere, seas 2 ft or less. .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 2 ft or less. .MON NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .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...S of 18N, E winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Elsewhere, E winds 10 to 15 kt. Seas 2 ft or less. .WED...E winds 10 to 15 kt. Seas 2 ft or less. Caribbean from 11N to 15N W of 72W .OVERNIGHT...E winds 10 to 20 kt. Seas 5 ft within 90 nm of coast of Colombia, and 2 ft or less elsewhere. .SAT...E winds 10 to 20 kt. Seas 5 ft. .SAT NIGHT...NE winds 10 to 20 kt. Seas 5 to 6 ft. .SUN...E winds 10 to 20 kt. Seas 5 to 6 ft. .SUN NIGHT...NE winds 10 to 20 kt. Seas 5 to 6 ft. .MON...NE winds 10 to 20 kt. Seas 5 to 6 ft. .MON NIGHT...NE winds 10 to 20 kt. Seas 5 ft. .TUE...E winds 10 to 15 kt. Seas 2 ft or less. .TUE NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .WED...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. SW Caribbean S of 11N .OVERNIGHT...NE winds less than 10 kt. Seas 2 ft or less. .SAT...E winds less than 10 kt, shifting to SW in the afternoon. Seas 2 ft or less. .SAT NIGHT...N winds less than 10 kt. Seas 2 ft or less. .SUN...NE winds 10 to 15 kt. Seas 5 ft. .SUN NIGHT...N winds 10 to 15 kt. Seas 5 ft. .MON...NE winds 10 to 15 kt. Seas 5 ft. .MON NIGHT...N winds 10 to 15 kt. Seas 5 ft. .TUE...NW winds 10 to 15 kt. Seas 2 ft or less. .TUE NIGHT...N winds less than 10 kt, shifting to SW after midnight. Seas 2 ft or less. .WED...W winds less than 10 kt. Seas 2 ft or less. Caribbean between 64W and 72W .OVERNIGHT...E winds 10 to 20 kt. Seas 2 ft or less. .SAT...E winds 10 to 20 kt. Seas 2 ft or less, building to 5 ft in the afternoon. .SAT NIGHT...E winds 10 to 20 kt. Gulf of Venezuela, seas 2 ft or less, building to 5 ft after midnight. Elsewhere, seas 5 ft. .SUN...E winds 10 to 20 kt. Seas 2 ft or less. .SUN NIGHT...E winds 10 to 20 kt. Seas 2 ft or less. .MON...E winds 10 to 20 kt. Seas 2 ft or less. .MON NIGHT...E winds 10 to 20 kt. Seas 2 ft or less. .TUE...E winds 10 to 20 kt. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 20 kt. Seas 2 ft or less. .WED...E winds 10 to 15 kt. Seas 2 ft or less. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .OVERNIGHT...E winds 10 to 15 kt. Seas 5 to 6 ft. .SAT...SE winds 10 to 15 kt. Seas 5 to 6 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 5 to 6 ft. .SUN...E winds 10 to 15 kt. Seas 5 to 6 ft. .SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 5 to 6 ft. .MON...HURRICANE CONDITIONS POSSIBLE. .MON NIGHT...HURRICANE CONDITIONS POSSIBLE. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .OVERNIGHT...E winds 10 to 15 kt. Seas 5 ft. .SAT...E winds less than 10 kt. Seas 5 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 5 to 6 ft. .SUN...E winds 10 to 15 kt. Seas 5 to 6 ft. .SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 5 to 6 ft. .MON...HURRICANE CONDITIONS POSSIBLE. .MON NIGHT...HURRICANE CONDITIONS POSSIBLE. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...TROPICAL STORM CONDITIONS POSSIBLE. 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 and weaken through early Sun. Then, reinforcing moderate N winds will push the front eastward as a weak cold front, reaching from 31N69W to 27N74W by Mon morning. The front will stall and dissipate Tue. Farther east, Hurricane Sam is near 12.4N 45.9W 982 mb at 11 PM EDT, moving WNW at 12 kt. Maximum sustained winds 85 kt gusts 105 kt. Sam will strengthen to a major hurricane on Sat near 12N47W and move to near 13.5N50.0W Sun morning, 14.1N 51.2W Sun evening, 14.8N52.4W Mon morning, and 15.7N53.5W Mon evening. Sam will change little in intensity as it moves to 17.4N55.8W by late Tue. ATLC waters from 27N to 31N W of 77W .OVERNIGHT...NE winds 10 to 15 kt. Seas 5 ft. .SAT...N winds 10 to 15 kt. Seas 5 ft. .SAT NIGHT...N winds 10 to 15 kt. Seas 2 ft or less, building to 5 ft after midnight. .SUN...N winds 10 to 15 kt. Seas 5 ft. .SUN NIGHT...N winds 10 to 15 kt, shifting to NE after midnight. Seas 5 ft. .MON...NE winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .TUE...NE winds less than 10 kt. Seas 2 ft or less. .TUE NIGHT...SE winds less than 10 kt. Seas 2 ft or less. .WED...N winds less than 10 kt. Seas 2 ft or less. ATLC waters from 27N to 31N between 65W and 77W .OVERNIGHT...E winds less than 10 kt. Seas 5 to 6 ft. .SAT...W of 70W, S winds 10 to 15 kt, shifting to SW in the afternoon. Elsewhere, N winds less than 10 kt. Seas 5 to 6 ft. .SAT NIGHT...W of 70W, W winds less than 10 kt, increasing to 10 to 15 kt after midnight. Elsewhere, NW winds less than 10 kt. Seas 5 ft. .SUN...NW winds 10 to 15 kt W of 70W, and SW less than 10 kt elsewhere. Seas 5 ft. .SUN NIGHT...N winds 10 to 15 kt W of 70W, and S less than 10 kt elsewhere. Seas 5 ft in the evening, subsiding to 2 ft or less. .MON...NE winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .TUE...NE winds 10 to 15 kt. Seas 2 ft or less, building to 5 ft in the afternoon. .TUE NIGHT...W of 70W, NE winds 10 to 15 kt. Elsewhere, SE winds 10 to 15 kt, shifting to S after midnight. Seas 5 to 6 ft. .WED...NE winds less than 10 kt. Seas 5 to 6 ft. Bahamas N of 22N .OVERNIGHT...E winds less than 10 kt. Seas 2 ft or less. .SAT...SE winds less than 10 kt. Seas 2 ft or less. .SAT NIGHT...NE winds less than 10 kt. Seas 2 ft or less. .SUN...N winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 ft or less. .SUN NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .MON...N winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .TUE...NE winds 10 to 15 kt. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .WED...NE winds less than 10 kt. Seas 2 ft or less. ATLC waters from 22N to 27N between 65W and the Bahamas .OVERNIGHT...NE winds less than 10 kt. Seas 5 ft. .SAT...W of 70W, E winds less than 10 kt in the morning, becoming variable winds less than 10 kt. Elsewhere, N winds 10 to 15 kt. Seas 5 ft. .SAT NIGHT...NE winds less than 10 kt. Seas 5 ft. .SUN...W of 70W, NE winds less than 10 kt, shifting to NW in the afternoon. Elsewhere, NE winds less than 10 kt. Seas 5 ft in the morning, subsiding to 2 ft or less. .SUN NIGHT...W of 70W, N winds 10 to 15 kt, shifting to NE after midnight. Elsewhere, NE winds less than 10 kt in the evening, becoming variable winds less than 10 kt. Seas 2 ft or less. .MON...W of 70W, NE winds less than 10 kt, shifting to N in the afternoon. Elsewhere, SE winds less than 10 kt. Seas 2 ft or less. .MON NIGHT...NE winds 10 to 15 kt W of 70W, and SE less than 10 kt elsewhere. Seas 2 ft or less, building to 5 ft after midnight. .TUE...S winds less than 10 kt. Seas 5 to 6 ft. .TUE NIGHT...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 5 to 6 ft W of 70W, and 6 to 9 ft elsewhere. ATLC waters S of 22N W of 65W .OVERNIGHT...E winds less than 10 kt. Seas 5 ft. .SAT...SE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 5 ft. .SAT NIGHT...E winds less than 10 kt. Seas 5 ft. .SUN...E winds less than 10 kt. Seas 5 ft in the morning, subsiding to 2 ft or less. .SUN NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .MON...E winds less than 10 kt. Seas 2 ft or less. .MON NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 5 ft after midnight. .TUE...SE winds 10 to 15 kt, shifting to E in the afternoon. Seas 5 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 5 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 .OVERNIGHT...SE winds 10 to 15 kt. Seas 5 to 6 ft. .SAT...SE winds 10 to 15 kt. Seas 5 to 6 ft. .SAT NIGHT...E winds less than 10 kt. Seas 5 ft. .SUN...SE winds 10 to 15 kt. Seas 5 to 6 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. .MON...SE winds 10 to 15 kt. Seas 5 to 7 ft. .MON NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE.