000 FZNT31 KNHC 242133 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 533 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 is near 12.1N 44.8W 986 mb at 5 PM EDT moving W at 10 kt. Maximum sustained winds are 75 kt with gusts to 90 kt. Sam will strengthen to a major hurricane Sat afternoon near 13N48W and move to near 15N53W Mon afternoon. Sam is forecast to enter the offshore waters east of Leeward Islands Tue near 17N55W and move to near 19N58W Wed. 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 .TONIGHT...E winds less than 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 20 kt. Seas 2 ft or less, building to 3 ft after midnight. .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, building to 3 ft after midnight. .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 less than 10 kt. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .WED...E winds less than 10 kt. Seas 2 ft or less. Caribbean N of 15N between 72W and 85W .TONIGHT...S of 18N, E winds 10 to 15 kt. Elsewhere, E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 ft or less. .SAT...E winds 10 to 20 kt. Seas 3 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SUN...S of 18N, E winds 10 to 20 kt. Elsewhere, NE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. 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...NE winds 10 to 15 kt. Seas 3 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 ft in the evening, subsiding to 2 ft or less. .TUE...E winds 10 to 15 kt. Seas 2 ft or less. .TUE NIGHT...E winds less than 10 kt S of 18N, and E 10 to 15 kt elsewhere. 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 .TONIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT...E winds 15 to 25 kt. Seas 3 to 5 ft. .SAT NIGHT...NE winds 15 to 25 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 20 kt within 90 nm of coast of Colombia, and E 15 to 25 kt elsewhere. Seas 4 to 6 ft. .SUN NIGHT...NE winds 10 to 20 kt within 90 nm of coast of Colombia, and NE 15 to 25 kt elsewhere. 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 20 kt. Seas 3 to 4 ft. .WED...Within 90 nm of coast of Colombia, E winds 10 to 15 kt, shifting to SE in the afternoon. Elsewhere, E winds 10 to 15 kt. Seas 3 ft. SW Caribbean S of 11N .TONIGHT...NE winds less than 10 kt. Seas 2 ft or less. .SAT...E winds 10 to 15 kt, shifting to SW in the afternoon. Seas 2 ft or less. .SAT NIGHT...N winds less than 10 kt. 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 20 kt. Seas 3 to 5 ft. .MON NIGHT...N winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 to 5 ft. .TUE...NW winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...N winds 10 to 15 kt, shifting to SW after midnight. Seas 3 to 4 ft. .WED...W winds less than 10 kt, shifting to S in the afternoon. Seas 3 ft. Caribbean between 64W and 72W .TONIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 20 kt. Seas 3 to 4 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 20 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 20 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 .TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 15 kt, shifting to SE in the afternoon. Seas 4 to 6 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 4 to 6 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...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 .TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .SAT...E winds less than 10 kt. Seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...HURRICANE CONDITIONS POSSIBLE. .MON NIGHT...HURRICANE CONDITIONS POSSIBLE. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .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 31N76W 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 12.1N 44.8W 986 mb at 5 PM EDT moving W at 10 kt. Maximum sustained winds are 75 kt with gusts to 90 kt. Sam will strengthen to a major hurricane Sat afternoon near 13N48W and move to near 15N53W Mon afternoon. Sam will move to near 17N55W Tue and to near 19N58W Wed. ATLC waters from 27N to 31N W of 77W .TONIGHT...NE winds 10 to 15 kt. Seas 4 to 5 ft. .SAT...N winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 5 ft. .SAT NIGHT...N winds 10 to 15 kt. Seas 4 to 5 ft. .SUN...N winds 10 to 15 kt. Seas 4 to 5 ft. .SUN NIGHT...N winds 10 to 15 kt, shifting to NE after midnight. Seas 4 to 5 ft. .MON...NE winds 10 to 15 kt. Seas 3 to 4 ft. .MON NIGHT...NE winds 10 to 15 kt, shifting to E after midnight. Seas 3 to 4 ft. .TUE...NE winds less than 10 kt. Seas 3 to 4 ft. .TUE NIGHT...SE 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 .TONIGHT...W of 70W, S winds 10 to 15 kt, shifting to SE after midnight. Elsewhere, N winds less than 10 kt. Seas 4 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 4 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 4 to 5 ft. .SUN...NW winds 10 to 15 kt W of 70W, and SW less than 10 kt elsewhere. Seas 4 to 5 ft. .SUN NIGHT...N winds 10 to 15 kt W of 70W, and S less than 10 kt elsewhere. 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, shifting to E after midnight. Seas 3 to 4 ft. .TUE...W of 70W, NE winds 10 to 15 kt. Elsewhere, S winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 to 5 ft. .TUE NIGHT...W of 70W, NE winds 10 to 15 kt, shifting to E after midnight. Elsewhere, S winds less than 10 kt. Seas 4 to 6 ft. .WED...NE winds less than 10 kt. Seas 4 to 6 ft. Bahamas N of 22N .TONIGHT...E winds less than 10 kt. Seas 3 ft. .SAT...SE winds less than 10 kt. Seas 3 ft. .SAT NIGHT...NE winds less than 10 kt. Seas 3 ft. .SUN...N winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 ft. .SUN NIGHT...NE winds 10 to 15 kt. Seas 3 ft. .MON...N winds 10 to 15 kt. Seas 3 ft. .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...NE winds 10 to 15 kt, shifting to E after midnight. Seas 2 ft or less, building to 3 ft after midnight. .WED...E winds less than 10 kt. Seas 3 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .TONIGHT...W of 70W, NE winds less than 10 kt. Elsewhere, N winds 10 to 15 kt, shifting to NE after midnight. Seas 4 to 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 4 to 5 ft. .SAT NIGHT...NE winds less than 10 kt. Seas 4 to 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 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 in the evening, becoming variable winds less than 10 kt. Seas 4 ft. .MON...W of 70W, NE winds less than 10 kt, shifting to N in the afternoon. Elsewhere, SE winds less than 10 kt. Seas 3 to 4 ft. .MON NIGHT...W of 70W, NE winds 10 to 15 kt, shifting to E after midnight. Elsewhere, SE winds less than 10 kt. Seas 3 to 5 ft. .TUE...S winds less than 10 kt. Seas 4 to 6 ft. .TUE NIGHT...W of 70W, E winds less than 10 kt. Elsewhere, SE winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 5 to 7 ft. .WED...SE winds less than 10 kt. Seas 4 to 6 ft W of 70W, and 6 to 9 ft elsewhere. ATLC waters S of 22N W of 65W .TONIGHT...E winds less than 10 kt. Seas 3 to 5 ft. .SAT...SE winds less than 10 kt. Seas 3 to 5 ft. .SAT NIGHT...E winds less than 10 kt. Seas 3 to 5 ft. .SUN...E winds less than 10 kt. Seas 3 to 5 ft. .SUN NIGHT...E winds less than 10 kt. Seas 3 to 4 ft. .MON...E winds less than 10 kt. Seas 3 to 4 ft. .MON NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 to 5 ft. .TUE...SE winds 10 to 15 kt, shifting to E in the afternoon. Seas 3 to 5 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED...SE winds 10 to 15 kt, shifting to E in the afternoon. Seas 5 to 7 ft. ATLC waters from 19N to 22N between 55W and 65W .TONIGHT...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, increasing to 10 to 15 kt after midnight. Seas 5 ft. .SUN...SE winds less than 10 kt. Seas 4 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. E winds 10 to 15 kt. Seas 6 to 9 ft. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE.