971 FZNT31 KNHC 300917 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 517 AM EDT Thu Sep 30 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 21.5N 59.1W 937 mb at 5 AM EDT moving NW at 10 kt. Maximum sustained winds are 125 kt gusts 150 kt. Sam will move to 23.0N 60.2W this afternoon, 25.6N 61.4W Fri morning, 28.4N 61.8W Fri afternoon, 31.1N 61.3W Sat morning, and move east of Bermuda near 33.5N 59.9W Sat afternoon, and 35.5N 58.0W Sun morning. Swells generated by Sam are forecast to continue over Atlantic waters from off the northern Leeward Islands to north of the Mona Passage through Fri. Meanwhile, gentle trades will prevail over the Caribbean through Fri. Winds are expected to become moderate to fresh across the basin by the weekend. NW Caribbean W of 85W .TODAY...E winds 10 to 15 kt. Seas 3 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 ft. .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. .SUN NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .MON...NE 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 S of 18N, and E 10 to 15 kt elsewhere. Seas 2 ft or less. .TONIGHT...E 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 to 4 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 5 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .MON...E winds 10 to 20 kt. Seas 3 to 5 ft. Caribbean from 11N to 15N W of 72W .TODAY...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 ft or less, building to 3 ft in the afternoon. .TONIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 ft or less, building to 3 ft after midnight. .FRI...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 ft. .FRI NIGHT...NE winds 10 to 20 kt. Seas 3 to 4 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. .SUN NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .MON...E winds 10 to 20 kt. Seas 3 to 5 ft. SW Caribbean S of 11N .TODAY...Variable winds less than 10 kt, becoming SE less than 10 kt in the afternoon. Seas 2 ft or less. .TONIGHT...Variable winds less than 10 kt. Seas 2 ft or less. .FRI...NE winds less than 10 kt. Seas 2 ft or less. .FRI NIGHT...N winds less than 10 kt, shifting to NE after midnight. Seas 2 ft or less. .SAT...N winds 10 to 15 kt. Seas 2 ft or less. .SAT NIGHT...N winds 10 to 15 kt. Seas 2 ft or less. .SUN...N winds 10 to 15 kt, shifting to NW in the afternoon. Seas 3 to 4 ft. .SUN NIGHT...NW winds less than 10 kt. Seas 3 to 4 ft. .MON...NW winds less than 10 kt. Seas 3 ft. Caribbean between 64W and 72W .TODAY...Gulf of Venezuela, NE winds less than 10 kt. Elsewhere, E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 ft. .TONIGHT...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 2 ft or less Gulf of Venezuela, and 3 to 5 ft elsewhere. .SAT...E winds 10 to 20 kt. Gulf of Venezuela, seas 3 ft in the morning, subsiding to 2 ft or less. Elsewhere, seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft Gulf of Venezuela, and 4 to 6 ft elsewhere. .SUN...E winds 10 to 20 kt. Seas 3 ft Gulf of Venezuela, and 5 to 7 ft elsewhere. .SUN NIGHT...E winds 10 to 20 kt. Seas 3 ft Gulf of Venezuela, and 5 to 7 ft elsewhere. .MON...E winds 10 to 20 kt. Seas 3 ft Gulf of Venezuela, and 6 to 8 ft elsewhere. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .TODAY...SE winds 10 to 20 kt. Seas 5 to 7 ft. .TONIGHT...SE 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 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 6 to 8 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 6 to 9 ft. .MON...E winds 10 to 20 kt. Seas 6 to 9 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .TODAY...E winds 10 to 15 kt. Seas 4 to 6 ft. .TONIGHT...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 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 6 to 8 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. .MON...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 21.5N 59.1W 937 mb at 5 AM EDT moving NW at 10 kt. Maximum sustained winds are 125 kt gusts 150 kt. Sam will move to 23.0N 60.2W this afternoon, 25.6N 61.4W Fri morning, 28.4N 61.8W Fri afternoon, 31.1N 61.3W Sat morning, and move east of Bermuda near 33.5N 59.9W Sat afternoon, and 35.5N 58.0W Sun morning. In addition to hurricane conditions northeast of the Leeward Islands through Thu, expect rough seas in the form of swell from Sam to impact the area northeast of the Bahamas starting Fri and continuing through the weekend. Meanwhile, 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 dissipate by Sat. Stronger high pressure will build in to the area, which will bring moderate to occasionally fresh winds through the weekend. 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. Seas 3 to 4 ft. .FRI...E winds 10 to 15 kt. Seas 3 to 5 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 5 to 7 ft. .SUN...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...E winds 10 kt. Seas 4 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 less than 10 kt, shifting to NE in the afternoon. Seas 3 to 5 ft. .TONIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft W of 70W, and 6 to 9 ft elsewhere. .FRI...NE winds 10 to 20 kt. W of 70W, seas 5 to 7 ft. Elsewhere, seas 7 to 10 ft, building to 8 to 13 ft in the afternoon. .FRI NIGHT...NE winds 15 to 25 kt. Seas 6 to 9 ft W of 70W, and 10 to 15 ft elsewhere. .SAT...NE winds 10 to 20 kt W of 70W, and N 15 to 25 kt elsewhere. Seas 7 to 8 ft W of 70W, and 8 to 11 ft elsewhere. .SAT NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft. .SUN...NE winds 10 to 15 kt. Seas 5 to 7 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. .MON...E winds 10 to 15 kt. Seas 5 to 7 ft. Bahamas N of 22N .TODAY...E winds 10 to 15 kt. Seas 3 ft. .TONIGHT...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. .SUN NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .MON...E winds 10 to 15 kt. Seas 3 to 4 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .TODAY...NE winds 10 to 15 kt. Seas 4 to 6 ft. .TONIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft W of 70W, and 6 to 9 ft elsewhere. .FRI...NE winds 10 to 20 kt. Seas 6 to 8 ft W of 70W, and 7 to 10 ft elsewhere. .FRI NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft. .SAT...NE winds 10 to 20 kt. Seas 6 to 8 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SUN...E winds 10 to 20 kt. Seas 6 to 7 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 6 to 7 ft. .MON...SE winds 10 to 20 kt. Seas 5 to 7 ft. ATLC waters S of 22N W of 65W .TODAY...NE winds less than 10 kt. Seas 4 to 6 ft. .TONIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. .FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 15 kt. 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. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .MON...SE 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. W winds 100 to 120 kt, becoming SW 55 to 65 kt in the afternoon. Seas 14 to 19 ft, subsiding to 11 to 16 ft in the afternoon. .TONIGHT...S winds 20 to 30 kt, diminishing to 10 to 20 kt after midnight. Seas 8 to 13 ft, subsiding to 7 to 10 ft after midnight. .FRI...SE winds 10 to 15 kt. Seas 6 to 8 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 20 kt. Seas 6 to 7 ft. .SUN...E winds 10 to 20 kt. Seas 6 to 8 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 7 to 8 ft. .MON...E winds 10 to 20 kt. Seas 7 to 8 ft.