000 FZNT31 KNHC 182041 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 441 PM EDT Tue Mar 18 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...The tail of a cold front that extends from NW Haiti to E Jamaica to the offshore waters of Nicaragua will continue to weaken before dissipating tonight into early Wed. Building high pressure in the wake of the front N of the area will lead to the development of pulsing fresh to strong NE winds in the lee of Cuba and the Windward Passage this evening through Wed evening. In the south-central and portions of the SW Caribbean, fresh to strong NE to E winds will prevail through the weekend, increasing in areal coverage Fri. Otherwise, high pressure will build near the Bahamas over the weekend and trade winds will increase across the region, with gale-force winds developing offshore Colombia Sat evening along with 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. Looking ahead, the tail of a cold front will enter the NW Caribbean early Fri and dissipate Fri evening. NW Caribbean W of 85W .TONIGHT...NE winds 10 to 15 kt. Seas 5 to 7 ft. .WED...E winds 10 to 15 kt. Seas 4 to 5 ft. .WED NIGHT...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 less than 10 kt, increasing to 10 to 15 kt after midnight. 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 .TONIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .WED...E winds 10 to 15 kt. Seas 3 to 5 ft. .WED NIGHT...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...NE winds 10 to 15 kt. 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 NIGHT... .TONIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .WED...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. .WED NIGHT...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 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 9 ft. .SAT...NE winds 15 to 25 kt. Seas 6 to 9 ft. .SAT NIGHT...NE winds 15 to 35 kt. Seas 8 to 11 ft. .SUN...E winds 15 to 25 kt. Seas 8 to 11 ft. .SUN NIGHT...E winds 15 to 25 kt. Seas 8 to 11 ft. SW Caribbean S of 11N .TONIGHT...N winds 10 to 20 kt. Seas 3 to 5 ft. .WED...NE winds 10 to 20 kt. Seas 4 to 6 ft. .WED NIGHT...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 10 to 20 kt. Seas 7 to 10 ft. .SUN...NE winds 10 to 20 kt. Seas 8 to 11 ft. .SUN NIGHT...NE winds 10 to 20 kt. Seas 8 to 11 ft. Caribbean between 64W and 72W .TONIGHT...NE winds 10 to 20 kt Gulf of Venezuela, and NE less than 10 kt elsewhere. Seas 3 to 4 ft. .WED...NE winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .THU...E winds 10 to 15 kt. 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 .TONIGHT...S winds less than 10 kt. Seas 4 to 6 ft. .WED...S winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...S winds less than 10 kt. Seas 3 to 5 ft. .THU...SE winds less than 10 kt. Seas 5 to 7 ft. .THU NIGHT...E winds less than 10 kt. Seas 6 to 9 ft. .FRI...SE winds 10 to 15 kt. 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 .TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED...E 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 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...Fresh winds and rough seas in the SE semicircle of a non-tropical low of 1007 mb near 26N58W will continue to affect the offshore waters N of 22N and E of 61W through this evening as the low open opens into a trough and moves N of the area. Strong to near gale-force winds will precede and continue to follow a cold front that extends from just W of Bermuda near 31N65W to NW Hispaniola, which is forecast to reach from 31N60W to Puerto Rico by Wed morning. A low pressure system is forecast to develop along this front tonight into Wed, which will support the development of gale-force winds and very rough seas between Bermuda and the Bahamas tonight through Wed afternoon. Afterward, winds and seas will gradually diminish across the region through Thu night. Looking ahead, fresh to strong southerly winds will develop over the NE Florida offshore waters on Thu ahead of a strong cold front forecast to enter the NW offshore waters late Thu into Thu evening. Near gale-force NW winds 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 the remaining weekend. ATLC waters from 27N to 31N W of 77W .TONIGHT...N winds 10 to 20 kt. Seas 7 to 10 ft. .WED...N winds 10 to 15 kt. Seas 7 to 10 ft. .WED NIGHT...NW winds less than 10 kt. 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 20 to 25 kt, diminishing to 10 to 20 kt in the afternoon. Seas 8 to 12 ft. .FRI NIGHT...N winds 10 to 15 kt, shifting to NW after midnight. 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...SE winds less than 10 kt. Seas 3 to 4 ft. .SUN NIGHT...SE winds 10 to 15 kt. Seas 3 ft. ATLC waters from 27N to 31N between 65W and 77W ...GALE WARNING... .TONIGHT...NW winds 25 to 35 kt W of 70W, and W 20 to 30 kt elsewhere. W of 70W, seas 10 to 15 ft, building to 13 to 18 ft after midnight. Elsewhere, seas 8 to 12 ft, building to 11 to 16 ft after midnight. .WED...NW winds 25 to 35 kt W of 70W, and NW 20 to 30 kt elsewhere. Seas 15 to 20 ft. .WED NIGHT...NW winds 20 to 30 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 winds 10 to 20 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...NW 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...NW winds less than 10 kt. Seas 5 to 7 ft. .SUN NIGHT...E winds less than 10 kt. Seas 3 to 5 ft. Bahamas N of 22N .TONIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. .WED...N winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...N winds less than 10 kt. 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, increasing to 10 to 15 kt 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, increasing to 10 to 15 kt in the afternoon. 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... .TONIGHT...NW winds 15 to 25 kt W of 70W, and NW 20 to 35 kt elsewhere. Seas 9 to 14 ft. .WED...NW winds 15 to 25 kt W of 70W, and W 20 to 35 kt elsewhere. Seas 13 to 18 ft. .WED NIGHT...NW winds 15 to 25 kt W of 70W, and NW 20 to 30 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 15 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 .TONIGHT...NW winds 10 to 20 kt. Seas 6 to 8 ft. .WED...NW winds 10 to 15 kt. Seas 6 to 8 ft. .WED NIGHT...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...N 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 .TONIGHT...SW winds 10 to 15 kt. Seas 6 to 8 ft. .WED...SW winds 10 to 15 kt. Seas 6 to 8 ft. .WED NIGHT...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...W winds 10 to 15 kt, diminishing to less than 10 kt 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, becoming E less than 10 kt after midnight. 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.