000 FZNT31 KNHC 271520 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1120 AM EDT Mon Sep 27 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 15.7N 52.1W 966 mb at 15 UTC, moving NW at 7 kt. Maximum sustained winds are 110 kt with gusts to135 kt. Sam will move to 16.4N 52.8W this evening, 17.3N 53.9W Tue morning, 18.1N 55.1W Tue evening, 19.1N 56.5W Wed morning, 20.2N 58.1W Wed evening, and 21.7N 59.8W Thu morning. Sam will change little in intensity as it continues to move north of the area through Fri. Meanwhile, moderate trades will continue over much of the Caribbean through Tue. Fresh trades over the south- central Caribbean will diminish to gentle to moderate speeds today. Gentle trades will then prevail over the Caribbean through Fri. Swells generated by Sam are forecast to reach the Leeward Islands by later today through the middle of the week. NW Caribbean W of 85W .THIS AFTERNOON...E winds less than 10 kt. Seas 2 ft or less. .TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .TUE...E winds 10 to 15 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .WED...E winds less than 10 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .WED NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .THU...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .THU NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .FRI...E winds 10 to 15 kt. Seas 3 ft. Caribbean N of 15N between 72W and 85W .THIS AFTERNOON...NE winds 10 to 15 kt. Seas 3 ft. .TONIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .TUE...S of 18N, E winds 10 to 15 kt. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .TUE NIGHT...NE winds less than 10 kt, shifting to E after midnight. Seas 2 ft or less. .WED...S of 18N, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Elsewhere, E winds less than 10 kt. Seas 2 ft or less. .WED NIGHT...S of 18N, E winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Elsewhere, NE 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...E winds less than 10 kt S of 18N, and NE 10 to 15 kt elsewhere. Seas 2 ft or less. .FRI...E winds 10 to 15 kt. Seas 2 ft or less. Caribbean from 11N to 15N W of 72W .THIS AFTERNOON...E winds 10 to 20 kt. Seas 4 to 5 ft. .TONIGHT...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...Within 90 nm of coast of Colombia, E winds 10 to 15 kt. Elsewhere, NE winds 10 to 15 kt, shifting to E in the afternoon. Seas 3 ft. .WED NIGHT...NE winds less than 10 kt. Seas 3 ft. .THU...E winds less than 10 kt. Seas 3 ft. .THU NIGHT...E winds less than 10 kt. Seas 2 ft or less, building to 3 ft after midnight. .FRI...E winds less than 10 kt. Seas 3 ft. SW Caribbean S of 11N .THIS AFTERNOON...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TONIGHT...N winds 10 to 15 kt. Seas 3 to 5 ft. .TUE...N winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...NW winds less than 10 kt. Seas 3 to 4 ft. .WED...NW winds less than 10 kt. Seas 3 ft. .WED NIGHT...Variable winds less than 10 kt, becoming W less than 10 kt after midnight. Seas 3 ft in the evening, subsiding to 2 ft or less. .THU...W winds less than 10 kt in the morning, becoming variable winds less than 10 kt. Seas 2 ft or less. .THU NIGHT...SW winds less than 10 kt. Seas 2 ft or less. .FRI...Variable winds less than 10 kt. Seas 2 ft or less. Caribbean between 64W and 72W .THIS AFTERNOON...E winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...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...Gulf of Venezuela, E winds 10 to 15 kt, shifting to SW in the afternoon. Elsewhere, E winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...Gulf of Venezuela, NE winds less than 10 kt, shifting to E after midnight. Elsewhere, E winds 10 to 15 kt. Seas 3 ft. .THU...NE winds less than 10 kt Gulf of Venezuela, and E 10 to 15 kt elsewhere. Seas 3 ft. .THU NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .FRI...E winds less than 10 kt Gulf of Venezuela, and E 10 to 15 kt elsewhere. Seas 3 to 4 ft. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W ...HURRICANE WARNING... .THIS AFTERNOON...E winds 10 to 15 kt. Seas 5 to 7 ft. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 15 to 25 kt. Seas 5 to 7 ft. .TUE...TROPICAL STORM CONDITIONS EXPECTED. NE winds 20 to 30 kt, increasing to 35 to 45 kt in the afternoon. Seas 7 to 10 ft. .TUE NIGHT...HURRICANE CONDITIONS EXPECTED. NE winds 85 to 100 kt. Seas 8 to 13 ft. .WED...HURRICANE CONDITIONS POSSIBLE. N winds 90 to 100 kt, becoming SW 55 to 65 kt in the afternoon. Seas 8 to 13 ft. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...TROPICAL STORM CONDITIONS POSSIBLE. .THU NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft. .FRI...E winds 10 to 20 kt. Seas 4 to 6 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .THIS AFTERNOON...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 4 to 6 ft. .TONIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .TUE...SE winds 10 to 20 kt. Seas 4 to 6 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED...SE winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...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 15 kt. Seas 4 to 6 ft. .FRI...E winds 10 to 20 kt. Seas 4 to 6 ft. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...A cold front extending from 30N65W to Grand Bahama Island will stall late today and dissipate through tonight, leaving generally light to gentle breezes and slight seas into mid week west of 65W. Meanwhile, Hurricane Sam was near 15.7N 52.1W 966 mb at 15 UTC, moving NW at 7 kt. Maximum sustained winds are 110 kt with gusts to 135 kt. Sam will move to 16.4N 52.8W this evening, 17.3N 53.9W Tue morning, 18.1N 55.1W Tue evening, then move to northeast of the Leeward Islands to 19.1N 56.5W by Wed morning. Sam will continue to the northwest reaching 20.2N 58.1W Wed evening, and 21.7N 59.8W Thu morning. Sam will change little in intensity as it moves more northward to southeast of Bermuda through Fri. At a minimum, expect rough seas in the outer swell from Sam from mid to late week, reaching as far west as 70W by Thu. ATLC waters from 27N to 31N W of 77W .THIS AFTERNOON...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...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...E winds less than 10 kt. Seas 3 ft. .WED...N winds less than 10 kt. Seas 3 ft. .WED NIGHT...E winds less than 10 kt. Seas 3 ft. .THU...E winds less than 10 kt, shifting to NE in the afternoon. Seas 3 to 4 ft. .THU NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .FRI...NE winds 10 to 15 kt. Seas 3 to 5 ft. ATLC waters from 27N to 31N between 65W and 77W .THIS AFTERNOON...NE winds 10 to 15 kt W of 70W, and N less than 10 kt elsewhere. Seas 3 to 5 ft. .TONIGHT...NE winds 10 to 15 kt W of 70W, and E less than 10 kt elsewhere. Seas 3 to 5 ft. .TUE...NE winds 10 to 15 kt W of 70W, and E less than 10 kt elsewhere. Seas 3 to 4 ft. .TUE NIGHT...W of 70W, NE winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Elsewhere, E winds less than 10 kt. Seas 3 to 4 ft. .WED...NE winds less than 10 kt. Seas 3 to 4 ft. .WED NIGHT...NE winds less than 10 kt. Seas 3 to 5 ft. .THU...NE winds 10 to 15 kt W of 70W, and NE less than 10 kt elsewhere. Seas 3 to 5 ft. .THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. Bahamas N of 22N .THIS AFTERNOON...NE winds 10 to 15 kt. Seas 2 ft or less. .TONIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .TUE...NE winds 10 to 15 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .TUE NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .WED...NE winds less than 10 kt. Seas 2 ft or less. .WED NIGHT...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...NE winds 10 to 15 kt. Seas 3 to 4 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .THIS AFTERNOON...NE winds 10 to 15 kt W of 70W, and Variable less than 10 kt elsewhere. Seas 3 to 4 ft. .TONIGHT...NE 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 4 ft. .TUE NIGHT...W of 70W, E winds 10 to 15 kt. Elsewhere, Variable winds less than 10 kt, becoming SE 10 kt after midnight. Seas 3 to 5 ft. .WED...SE winds less than 10 kt. Seas 3 to 5 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .THU...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 4 to 5 ft W of 70W, and 6 to 9 ft elsewhere. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. ATLC waters S of 22N W of 65W .THIS AFTERNOON...E winds less than 10 kt. Seas 3 ft. .TONIGHT...E winds less than 10 kt. Seas 2 ft or less, building to 3 to 4 ft after midnight. .TUE...E winds less than 10 kt. Seas 3 ft. .TUE NIGHT...E winds less than 10 kt. Seas 3 to 4 ft. .WED...E winds less than 10 kt. Seas 3 to 4 ft. .WED NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 4 to 6 ft. .THU...E winds 10 to 15 kt. Seas 5 to 7 ft. .THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 10 to 15 kt. Seas 5 to 7 ft. .FRI...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 ...HURRICANE WARNING... .THIS AFTERNOON...E winds 10 to 15 kt. Seas 5 to 7 ft. .TONIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .TUE...HURRICANE CONDITIONS POSSIBLE. E winds 10 to 20 kt, increasing to 20 to 30 kt in the afternoon. Seas 6 to 9 ft. .TUE NIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 30 to 40 kt, increasing to 55 to 65 kt after midnight. Seas 7 to 10 ft, building to 11 to 16 ft after midnight. .WED...HURRICANE CONDITIONS POSSIBLE. NE winds 85 to 105 kt. Seas 11 to 16 ft. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...SE winds 10 to 20 kt. Seas 8 to 11 ft, subsiding to 6 to 8 ft in the afternoon.