000 FZNT31 KNHC 290915 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 515 AM EDT Wed Sep 29 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 was near 18.9N 56.2W 950 mb at 5 AM EDT moving NW at 8 kt. Maximum sustained winds 115 kt gusts 140 kt. Sam will move to 19.7N 57.3W this afternoon, 21.0N 58.9W Thu morning, 22.8N 60.4W Thu afternoon, 25.2N 61.5W Fri morning, 27.9N 62.0W Fri afternoon, and 30.8N 61.5W Sat morning. Sam will change little in intensity as it moves to north of 36N early Sun. Meanwhile, gentle trades will prevail over the Caribbean through Fri. Swells generated by Sam are forecast to continue off the Leeward Islands through Thu and will begin to impact the Mona and Anegada Passages later today through Fri. Winds are expected to increase moderate to fresh across the basin by the weekend. NW Caribbean W of 85W .TODAY...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 ft in the morning, subsiding to 2 ft or less. .TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .THU...E winds 10 to 15 kt. Seas 3 ft. .THU NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .FRI...E winds 10 to 15 kt. Seas 3 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 3 ft. .SAT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SUN...E winds 10 to 15 kt. Seas 3 to 4 ft. Caribbean N of 15N between 72W and 85W .TODAY...E winds less than 10 kt. Seas 2 ft or less. .TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .THU...E winds less than 10 kt S of 18N, and E 10 to 15 kt elsewhere. Seas 2 ft or less. .THU NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .FRI...E winds 10 to 15 kt. Seas 3 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 2 ft or less, building to 3 ft after midnight. .SAT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SUN...E winds 10 to 20 kt. Seas 3 to 4 ft. Caribbean from 11N to 15N W of 72W .TODAY...Within 90 nm of coast of Colombia, E winds less than 10 kt. Elsewhere, NE winds 10 to 15 kt, shifting to E in the afternoon. Seas 3 ft. .TONIGHT...E winds less than 10 kt. Seas 3 ft. .THU...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 ft. .THU NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .FRI...E winds less than 10 kt within 90 nm of coast of Colombia, and E 10 to 15 kt elsewhere. Seas 3 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 3 ft. .SAT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 20 kt. Seas 3 to 5 ft. SW Caribbean S of 11N .TODAY...NW winds less than 10 kt. Seas 3 ft. .TONIGHT...NW winds less than 10 kt. Seas 3 ft in the evening, subsiding to 2 ft or less. .THU...W winds less than 10 kt. Seas 2 ft or less. .THU NIGHT...N winds less than 10 kt. Seas 2 ft or less. .FRI...SE winds less than 10 kt. Seas 2 ft or less. .FRI NIGHT...N winds less than 10 kt. Seas 2 ft or less. .SAT...N winds less than 10 kt. Seas 2 ft or less. .SAT NIGHT...N winds less than 10 kt. Seas 2 ft or less. .SUN...NW winds less than 10 kt. Seas 2 ft or less. Caribbean between 64W and 72W .TODAY...SE winds less than 10 kt Gulf of Venezuela, and E 10 to 15 kt elsewhere. Seas 3 ft. .TONIGHT...E winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Seas 3 ft. .THU...Gulf of Venezuela, variable winds less than 10 kt. E winds less than 10 kt in the morning. Elsewhere, 10 to 15 kt in the afternoon. Seas 3 ft. .THU NIGHT...Gulf of Venezuela, NE winds 10 to 15 kt, shifting to E after midnight. Elsewhere, E winds 10 to 15 kt. Seas 3 ft. .FRI...E winds less than 10 kt Gulf of Venezuela, and E 10 to 15 kt elsewhere. Seas 2 ft or less Gulf of Venezuela, and 3 to 4 ft elsewhere. .FRI NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT...E winds 10 to 20 kt. Gulf of Venezuela, seas 2 ft or less, building to 3 ft in the afternoon. Elsewhere, seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 20 kt. Gulf of Venezuela, seas 3 ft in the morning, subsiding to 2 ft or less. Elsewhere, seas 4 to 6 ft. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W ...HURRICANE WARNING... .TODAY...TROPICAL STORM CONDITIONS. N winds 90 to 110 kt, becoming W 45 to 55 kt in the afternoon. Seas 8 to 11 ft. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. W winds 30 to 40 kt, becoming S 15 to 25 kt after midnight. Seas 7 to 10 ft. .THU...SE winds 10 to 20 kt. Seas 6 to 9 ft. .THU NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft. .FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SAT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. .SUN...E winds 10 to 20 kt. Seas 6 to 8 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .TODAY...SE winds 10 to 15 kt. Seas 4 to 6 ft. .TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .THU...E winds 10 to 15 kt. Seas 4 to 6 ft. .THU NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .FRI...E winds 10 to 20 kt. Seas 4 to 6 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SAT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. .SUN...E winds 10 to 20 kt. Seas 6 to 8 ft. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...Hurricane Sam was near 18.9N 56.2W 950 mb at 5 AM EDT moving NW at 8 kt. Maximum sustained winds 115 kt gusts 140 kt. Sam will move to 19.7N 57.3W this afternoon, 21.0N 58.9W Thu morning, 22.8N 60.4W Thu afternoon, 25.2N 61.5W Fri morning, 27.9N 62.0W Fri afternoon, and 30.8N 61.5W Sat morning. Sam will change little in intensity as it moves to north of 36N early Sun. In addition to hurricane conditions northeast of the Leeward Islands through Wed, expect rough seas in the form of swell from Sam to impact the area from Thu through Sat. Farther west, a weak pressure pattern will maintain light to gentle breezes and slight seas through Thu. A weak cold front will move from the Carolinas to the central Bahamas by Fri and and dissipate by Sat. Stronger high pressure will build in to the area, which will bring moderate to fresh winds through the weekend. ATLC waters from 27N to 31N W of 77W .TODAY...NE winds less than 10 kt. Seas 3 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 ft. .THU...NE winds 10 to 15 kt. Seas 3 ft. .THU NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SAT...E winds 10 to 20 kt. Seas 6 to 8 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. .SUN...E winds 10 to 20 kt. Seas 5 to 7 ft. ATLC waters from 27N to 31N between 65W and 77W .TODAY...NE winds less than 10 kt. Seas 3 to 4 ft. .TONIGHT...NE winds less than 10 kt. Seas 4 to 6 ft. .THU...N winds less than 10 kt, shifting to NE in the afternoon. Seas 3 to 4 ft W of 70W, and 5 to 7 ft elsewhere. .THU NIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft W of 70W, and 6 to 9 ft elsewhere. .FRI...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 10 to 20 kt. W of 70W, seas 5 to 7 ft. Elsewhere, seas 8 to 11 ft, building to 9 to 14 ft in the afternoon. .FRI NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .SAT...NE winds 10 to 20 kt. Seas 7 to 9 ft W of 70W, and 8 to 13 ft elsewhere. .SAT NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft. .SUN...NE winds 10 to 20 kt. Seas 6 to 8 ft. Bahamas N of 22N .TODAY...NE winds less than 10 kt. Seas 2 ft or less. .TONIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .THU...NE winds 10 to 15 kt. Seas 3 ft. .THU NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .FRI...E winds 10 to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 20 kt. Seas 3 to 5 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .TODAY...W of 70W, E winds less than 10 kt, shifting to NE in the afternoon. Elsewhere, SW winds less than 10 kt. Seas 4 to 5 ft. .TONIGHT...NE winds 10 to 15 kt W of 70W, and E less than 10 kt elsewhere. Seas 5 to 7 ft. .THU...W of 70W, NE winds 10 to 15 kt. Elsewhere, E winds less than 10 kt, shifting to NE in the afternoon. Seas 4 to 6 ft W of 70W, and 6 to 9 ft elsewhere. .THU NIGHT...NE winds 10 to 15 kt. W of 70W, seas 5 to 7 ft. Elsewhere, seas 7 to 10 ft, building to 8 to 13 ft after midnight. .FRI...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 10 to 20 kt. Seas 5 to 7 ft W of 70W, and 9 to 14 ft elsewhere. .FRI NIGHT...NE winds 10 to 20 kt. Seas 7 to 10 ft. .SAT...NE winds 10 to 20 kt. Seas 6 to 9 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 6 to 7 ft. .SUN...E winds 10 to 20 kt. Seas 6 to 7 ft. ATLC waters S of 22N W of 65W .TODAY...E winds less than 10 kt. Seas 3 to 4 ft. .TONIGHT...E winds less than 10 kt. Seas 4 to 6 ft. .THU...E winds less than 10 kt. Seas 5 to 7 ft. .THU NIGHT...NE winds 10 to 15 kt. Seas 6 to 9 ft. .FRI...E winds 10 to 15 kt. Seas 6 to 9 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 20 kt. Seas 4 to 6 ft. ATLC waters from 19N to 22N between 55W and 65W ...HURRICANE WARNING... .TODAY...HURRICANE CONDITIONS. NE winds 95 to 115 kt. Seas 12 to 17 ft. .TONIGHT...HURRICANE CONDITIONS EXPECTED. NE winds 95 to 115 kt. Seas 13 to 18 ft. .THU...HURRICANE CONDITIONS EXPECTED. W winds 95 to 115 kt, becoming SW 75 to 85 kt in the afternoon. Seas 12 to 17 ft. .THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SW winds 20 to 30 kt, becoming S 10 to 20 kt after midnight. Seas 9 to 14 ft, subsiding to 8 to 11 ft after midnight. .FRI...SE winds 10 to 15 kt. Seas 6 to 9 ft. .FRI NIGHT...SE winds 10 to 15 kt. Seas 6 to 7 ft. .SAT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 6 to 8 ft. .SUN...E winds 10 to 15 kt. Seas 6 to 8 ft.