000 FZNT31 KNHC 270915 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 515 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 15.2N 51.4W 952 mb at 5 AM EDT moving NW at 7 kt. Maximum sustained winds 115 kt gusts 140 kt. Sam will move to 15.9N 52.2W this afternoon, 16.8N 53.3W Tue morning, 17.7N 54.4W Tue afternoon, 18.6N 55.6W Wed morning, 19.6N 57.1W Wed afternoon, and 21.0N 58.8W Thu morning. Sam will change little in intensity as it moves near 24.9N 61.6W early 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. Fresh trades will follow in the wake of Sam across the Tropical N Atlantic waters. Swells generated by Sam are forecast to reach the Lesser Antilles by later today through the middle of the week. NW Caribbean W of 85W .TODAY...E winds 10 kt. Seas 2 ft or less. .TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .TUE...E winds 10 to 15 kt. Seas 3 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 3 ft. .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 kt. Seas 2 ft or less. .THU NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .FRI...E winds 10 kt. Seas 3 ft. Caribbean N of 15N between 72W and 85W .TODAY...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .TUE...E winds 10 to 15 kt. Seas 3 ft in the morning, subsiding to 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...E winds less than 10 kt S of 18N, and NE 10 to 15 kt elsewhere. Seas 2 ft or less. .THU...S of 18N, E winds less than 10 kt. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. 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 less than 10 kt S of 18N, and E 10 to 15 kt elsewhere. Seas 2 ft or less. Caribbean from 11N to 15N W of 72W .TODAY...NE winds 10 to 20 kt. Seas 4 to 6 ft. .TONIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 5 ft. .TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .WED...E winds 10 to 15 kt. Seas 3 ft. .WED NIGHT...E 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 3 ft. .FRI...E winds less than 10 kt. Seas 3 ft. SW Caribbean S of 11N .TODAY...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TONIGHT...N winds 10 to 15 kt. Seas 3 to 5 ft. .TUE...NE winds 10 to 15 kt, shifting to N in the afternoon. Seas 3 to 4 ft. .TUE NIGHT...N winds less than 10 kt. Seas 3 to 4 ft. .WED...N winds less than 10 kt. Seas 3 ft. .WED NIGHT...Variable winds less than 10 kt. Seas 2 ft or less. .THU...Variable winds less than 10 kt. Seas 2 ft or less. .THU NIGHT...Variable 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 .TODAY...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 2 ft or less Gulf of Venezuela, and 3 to 4 ft elsewhere. .WED NIGHT...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 3 ft. .FRI...E winds 10 to 15 kt. Seas 2 ft or less Gulf of Venezuela, and 3 to 4 ft elsewhere. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W ...HURRICANE WARNING... .TODAY...E winds 10 to 15 kt. Seas 5 to 7 ft. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 20 kt, becoming NE 20 to 30 kt after midnight. Seas 5 to 7 ft. .TUE...TROPICAL STORM CONDITIONS EXPECTED. NE winds 20 to 30 kt, increasing to 40 to 50 kt in the afternoon. Seas 7 to 10 ft. .TUE NIGHT...HURRICANE CONDITIONS EXPECTED. NE winds 85 to 95 kt. Seas 8 to 13 ft. .WED...HURRICANE CONDITIONS POSSIBLE. N winds 85 to 95 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 20 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 .TODAY...E winds less than 10 kt, shifting to SE 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 is pressing southward across the Bahamas with a trough stretching from 30N68W to 25N74W. This front will weaken by tonight. Expect showers and thunderstorms along this boundary through Mon night. Gentle to moderate winds will prevail through most of the week. Stronger high pressure will build southward over the NW and north- central offshore waters late in the week, bringing moderate to locally fresh winds across the northern SW Atlantic. Meanwhile, Hurricane Sam was near 15.2N 51.4W 952 mb at 5 AM EDT moving NW at 7 kt. Maximum sustained winds 115 kt gusts 140 kt. Sam is forecast to continue on its current motion over the next few days as it slowly weakens reaching near 25N62W by late Fri, with maximum sustained winds 105 kt gusts 130 kt. Swells generated by Sam are expected to spread westward across the forecast waters late in the week. ATLC waters from 27N to 31N W of 77W .TODAY...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 .TODAY...W of 70W, NE winds 10 to 15 kt. Elsewhere, N winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. 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...W of 70W, NE winds 10 to 15 kt. Elsewhere, NE winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 to 5 ft. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. Bahamas N of 22N .TODAY...NE winds 10 to 15 kt. Seas 3 ft in the morning, subsiding to 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 5 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .TODAY...W of 70W, NE winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Elsewhere, Variable winds less than 10 kt. 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...E winds 10 to 15 kt W of 70W, and SE less than 10 kt elsewhere. 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...NE winds 10 to 20 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 .TODAY...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 10 to 15 kt. Seas 4 to 6 ft. .THU...E winds 10 to 20 kt. Seas 5 to 7 ft. .THU NIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. .FRI...E winds 10 to 20 kt. Seas 5 to 7 ft. ATLC waters from 19N to 22N between 55W and 65W ...HURRICANE WARNING... .TODAY...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 20 to 30 kt. Seas 6 to 9 ft. .TUE NIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 35 to 45 kt, increasing to 65 to 75 kt after midnight. Seas 7 to 10 ft, building to 10 to 15 ft after midnight. .WED...HURRICANE CONDITIONS POSSIBLE. E winds 75 to 95 kt, shifting to NE 85 to 95 kt in the afternoon. Seas 12 to 17 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.