609 FZNT31 KNHC 190917 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 517 AM EDT Wed Mar 19 2025 Marine Weather HF Voice Broadcast for the Tropical N Atlantic from 07N to 19N W of 55W, the N Atlantic from 19N to 31N W of 55W including the 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 W of 55W .SYNOPSIS...Fresh to strong easterly trade winds will prevail through early next week in the central Caribbean. Building ridge north of the area will result in an increase in areal coverage of the winds Fri through the early next week. Gale-force winds will pulse offshore Colombia at night on Sat and Sun, along with rough to very rough seas. Fresh to near gale-force winds will prevail in the central and portions of the SW Caribbean during the weekend and through early next week. The aforementioned ridge will also sustain fresh to strong NE winds in the lee of Cuba and the Windward Passage through tonight. Looking ahead, the tail of a cold front will enter the NW Caribbean early Fri and dissipate Fri evening. NW Caribbean W of 85W .TODAY...E winds 10 to 15 kt. Seas 4 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .THU...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 to 4 ft. .THU NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .FRI...NE 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 4 to 6 ft. .SAT NIGHT...E winds 10 to 15 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 5 to 7 ft. Caribbean N of 15N between 72W and 85W .TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .THU...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 3 to 4 ft. .THU NIGHT...S of 18N, NE winds 10 to 15 kt. Elsewhere, NE winds less than 10 kt, shifting to N after midnight. Seas 3 to 4 ft. .FRI...NE winds 10 to 15 kt. Seas 3 to 5 ft. .FRI NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .SAT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SUN...E winds 10 to 20 kt. Seas 5 to 7 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. Caribbean from 11N to 15N W of 72W ...GALE CONDITIONS POSSIBLE SAT AND SUN NIGHT... .TODAY...NE winds 10 to 20 kt within 90 nm of coast of Colombia, and NE 10 to 15 kt elsewhere. Seas 3 to 5 ft. .TONIGHT...NE winds 15 to 25 kt within 90 nm of coast of Colombia, and NE 10 to 20 kt elsewhere. Seas 4 to 6 ft. .THU...NE winds 15 to 25 kt within 90 nm of coast of Colombia, and NE 10 to 20 kt elsewhere. Seas 4 to 6 ft. .THU NIGHT...NE winds 15 to 25 kt within 90 nm of coast of Colombia, and NE 10 to 20 kt elsewhere. Seas 5 to 7 ft. .FRI...NE winds 10 to 20 kt. Seas 5 to 7 ft. .FRI NIGHT...NE winds 15 to 25 kt. Seas 6 to 9 ft. .SAT...NE winds 15 to 25 kt. Seas 6 to 9 ft. .SAT NIGHT...NE winds 25 to 35 kt. Seas 8 to 11 ft. .SUN...E winds 15 to 25 kt. Seas 8 to 11 ft. .SUN NIGHT...E winds 25 to 35 kt. Seas 8 to 11 ft. SW Caribbean S of 11N .TODAY...NE winds 10 to 20 kt. Seas 4 to 6 ft. .TONIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .THU...NE winds 10 to 20 kt. Seas 4 to 6 ft. .THU NIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. .FRI...NE winds 10 to 20 kt. Seas 5 to 7 ft. .FRI NIGHT...NE winds 10 to 20 kt. Seas 6 to 8 ft. .SAT...NE winds 10 to 20 kt. Seas 7 to 10 ft. .SAT NIGHT...NE winds 15 to 25 kt. Seas 7 to 10 ft. .SUN...NE winds 15 to 25 kt. Seas 8 to 11 ft. .SUN NIGHT...NE winds 10 to 20 kt. Seas 8 to 11 ft. Caribbean between 64W and 72W .TODAY...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...NE winds 15 to 20 kt Gulf of Venezuela, and NE 10 to 15 kt elsewhere. Seas 3 to 4 ft. .THU...E winds 10 to 20 kt Gulf of Venezuela, and E 10 to 15 kt elsewhere. Seas 3 to 5 ft. .THU NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .FRI...E winds 10 to 20 kt. Seas 5 to 7 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. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .TODAY...S winds less than 10 kt. Seas 4 to 6 ft. .TONIGHT...S winds less than 10 kt. Seas 3 to 5 ft. .THU...SE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 5 to 7 ft. .THU NIGHT...E winds less than 10 kt. Seas 6 to 9 ft. .FRI...E winds less than 10 kt, shifting to SE in the afternoon. Seas 6 to 8 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. .SAT...E winds 10 to 15 kt. Seas 5 to 7 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .SUN...E winds 10 to 20 kt. Seas 5 to 7 ft. .SUN NIGHT...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...E 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 15 kt. Seas 4 to 6 ft. .FRI...E winds 10 to 15 kt. Seas 6 to 8 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 6 to 8 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. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...Complex low pressure system located near Bermuda supports strong to gale-force W-NW winds and rough to very rough seas across the SW North Atlantic waters. The strongest winds and highest seas are found north of 27N and between 69W and 74W. The broad non-tropical system is forecast to make a counter- clockwise loop and turn north on Thu, moving away from our area. The strong to gale-force winds and rough to very rough seas will continue through tonight, then gradually diminish through Fri as the winds and seas slide eastward. Looking ahead, fresh to strong southerly winds will develop over the NE Florida offshore waters on Thu afternoon ahead of a strong cold front forecast to enter the NW offshore waters late Thu. Strong to near gale-force W-NW winds and rough to very rough seas will follow this front, which is forecast to reach from Bermuda to the central Bahamas late Fri. The front will move E of the area on Sat, allowing high pressure to build in and winds and seas to diminish. ATLC waters from 27N to 31N W of 77W .TODAY...N winds 10 to 15 kt. Seas 7 to 10 ft. .TONIGHT...NW winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Seas 7 to 10 ft. .THU...SW winds 10 to 20 kt. Seas 6 to 9 ft. .THU NIGHT...W winds 20 to 30 kt. Seas 7 to 10 ft. .FRI...NW winds 15 to 25 kt. Seas 8 to 12 ft. .FRI NIGHT...N winds 10 to 15 kt in the evening, becoming variable winds less than 10 kt. Seas 6 to 9 ft. .SAT...SW winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 4 to 6 ft. .SAT NIGHT...SW winds 10 to 15 kt, shifting to W after midnight. Seas 3 to 4 ft. .SUN...NE winds less than 10 kt, shifting to SE in the afternoon. Seas 3 to 4 ft. .SUN NIGHT...SE winds less than 10 kt, shifting to S after midnight. Seas 3 ft. ATLC waters from 27N to 31N between 65W and 77W ...GALE WARNING... .TODAY...NW winds 25 to 35 kt W of 70W, and NW 20 to 30 kt elsewhere. Seas 15 to 20 ft. .TONIGHT...NW winds 25 to 35 kt W of 70W, and NW 15 to 25 kt elsewhere. Seas 12 to 17 ft. .THU...NW winds 10 to 20 kt. Seas 9 to 14 ft, subsiding to 8 to 11 ft in the afternoon. .THU NIGHT...W of 70W, W winds 10 to 15 kt, shifting to SW 15 to 25 kt after midnight. Elsewhere, W winds 10 to 15 kt. Seas 6 to 9 ft. .FRI...W winds 15 to 25 kt. Seas 8 to 11 ft. .FRI NIGHT...NW winds 15 to 25 kt. Seas 8 to 13 ft. .SAT...N winds 10 to 15 kt, shifting to SW in the afternoon. Seas 8 to 11 ft. .SAT NIGHT...SW winds 10 to 15 kt. Seas 6 to 9 ft. .SUN...W winds less than 10 kt. Seas 5 to 7 ft. .SUN NIGHT...NW winds less than 10 kt, shifting to SE after midnight. Seas 3 to 5 ft. Bahamas N of 22N .TODAY...N winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 6 ft. .TONIGHT...N winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 6 to 8 ft. .THU...N winds less than 10 kt in the morning, becoming variable winds less than 10 kt. Seas 5 to 7 ft. .THU NIGHT...W winds less than 10 kt, shifting to NW after midnight. Seas 3 to 5 ft. .FRI...NW winds 10 to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...N winds 10 to 15 kt, shifting to NE after midnight. Seas 3 to 5 ft. .SAT...E winds less than 10 kt. Seas 3 to 5 ft. .SAT NIGHT...E winds less than 10 kt. Seas 3 to 4 ft. .SUN...E winds less than 10 kt. Seas 3 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 3 ft. ATLC waters from 22N to 27N between 65W and the Bahamas ...GALE WARNING... .TODAY...NW winds 15 to 25 kt W of 70W, and W 20 to 30 kt elsewhere. Seas 13 to 18 ft. .TONIGHT...NW winds 15 to 25 kt W of 70W, and W 25 to 35 kt elsewhere. Seas 13 to 18 ft. .THU...NW winds 10 to 20 kt. Seas 9 to 14 ft W of 70W, and 11 to 15 ft elsewhere. .THU NIGHT...W winds 10 to 20 kt. Seas 7 to 10 ft. .FRI...W winds 10 to 20 kt. Seas 6 to 8 ft. .FRI NIGHT...NW winds 10 to 20 kt. Seas 6 to 9 ft. .SAT...E winds less than 10 kt. Seas 6 to 8 ft. .SAT NIGHT...E winds less than 10 kt. Seas 5 to 7 ft. .SUN...E winds less than 10 kt. Seas 5 to 7 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. ATLC waters S of 22N W of 65W .TODAY...NW winds 10 to 15 kt. Seas 6 to 8 ft. .TONIGHT...NW winds 10 to 20 kt. Seas 7 to 10 ft. .THU...NW winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 7 to 10 ft. .THU NIGHT...NW winds less than 10 kt. Seas 6 to 9 ft. .FRI...Variable winds less than 10 kt. Seas 4 to 6 ft. .FRI NIGHT...NE winds less than 10 kt. Seas 3 to 5 ft. .SAT...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. ATLC waters from 19N to 22N between 55W and 65W .TODAY...SW winds 10 to 15 kt. Seas 6 to 8 ft. .TONIGHT...SW winds 10 to 15 kt. Seas 6 to 9 ft. .THU...SW winds 10 to 15 kt. Seas 8 to 11 ft. .THU NIGHT...SW winds 10 to 15 kt, shifting to W after midnight. Seas 8 to 11 ft. .FRI...S winds less than 10 kt. Seas 7 to 10 ft. .FRI NIGHT...Variable winds less than 10 kt. Seas 6 to 8 ft. .SAT...E winds less than 10 kt. Seas 5 to 7 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN...E winds 10 to 15 kt. Seas 5 to 7 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft.