900 FZNT31 KNHC 170240 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1040 PM EDT Sun Mar 16 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...A cold front will enter the NW Caribbean tonight. Fresh to strong northerly winds and rough seas will follow the front, which is forecast to reach from eastern Cuba to the Gulf of Honduras by Mon night, and from the Windward Passage to near Cabo Gracias a Dios, Nicaragua on Tue before dissipating Tue night into Wed. Moderate to fresh N to NE winds will prevail across the NW Carribbean from Mon through mid week. In addition, NE fresh to strong winds will pulse across southern Cuba, the Windward Passage, and south of Haiti through the same period due to a developing low pressure north of the area. Seas in this area will range from 4 to 8 ft. High pressure over the central north Atlantic combined with the Colombian low will support pulsing winds to fresh to strong speeds at night offshore Colombia throughout the forecast period. NW Caribbean W of 85W .OVERNIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...NE winds 10 to 15 kt, increasing to 15 to 25 kt in the afternoon. Seas 5 to 7 ft. .MON NIGHT...NE winds 15 to 25 kt. Seas 5 to 7 ft. .TUE...NE winds 10 to 20 kt. Seas 6 to 8 ft. .TUE NIGHT...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 5 ft. .THU...E winds 10 to 15 kt, shifting to NE 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. Caribbean N of 15N between 72W and 85W .OVERNIGHT...E winds 10 to 15 kt S of 18N, and SE less than 10 kt elsewhere. Seas 3 to 5 ft. .MON...NE winds less than 10 kt. Seas 3 to 4 ft. .MON NIGHT...S of 18N, NE winds less than 10 kt, shifting to N after midnight. Elsewhere, N winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...NE winds 10 to 20 kt. Seas 4 to 6 ft. .TUE NIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .WED...NE winds 10 to 20 kt. Seas 4 to 6 ft. .WED NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .THU...NE winds 10 to 15 kt. Seas 3 to 5 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. Caribbean from 11N to 15N W of 72W .OVERNIGHT...NE winds 15 to 25 kt within 90 nm of coast of Colombia, and E 10 to 20 kt elsewhere. Seas 3 to 5 ft. .MON...NE winds 15 to 20 kt within 90 nm of coast of Colombia, and NE 10 to 15 kt elsewhere. Seas 4 to 6 ft. .MON NIGHT...NE winds 15 to 20 kt within 90 nm of coast of Colombia, and NE 10 to 15 kt elsewhere. Seas 4 to 6 ft. .TUE...NE winds 10 to 15 kt. Seas 3 to 5 ft. .TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .WED...NE winds 10 to 15 kt. Seas 3 to 5 ft. .WED NIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. .THU...NE winds 10 to 20 kt. Seas 5 to 7 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. SW Caribbean S of 11N .OVERNIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .MON...NE winds 10 to 15 kt. Seas 4 to 6 ft. .MON NIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. .TUE...N winds 10 to 20 kt. Seas 5 to 7 ft. .TUE NIGHT...N winds 10 to 20 kt. Seas 4 to 6 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 5 to 7 ft. .THU NIGHT...N winds 10 to 20 kt. Seas 5 to 7 ft. .FRI...N winds 10 to 20 kt. Seas 5 to 7 ft. .FRI NIGHT...NE winds 10 to 20 kt. Seas 6 to 8 ft. Caribbean between 64W and 72W .OVERNIGHT...NE winds 15 to 20 kt Gulf of Venezuela, and NE 10 to 15 kt elsewhere. Seas 3 to 4 ft. .MON...NE winds 10 to 20 kt Gulf of Venezuela, and NE 10 to 15 kt elsewhere. Seas 3 to 4 ft. .MON NIGHT...NE winds 15 to 20 kt Gulf of Venezuela, and NE 10 to 15 kt elsewhere. Seas 3 to 4 ft. .TUE...NE winds 10 to 15 kt Gulf of Venezuela, and E less than 10 kt elsewhere. Seas 3 to 4 ft. .TUE NIGHT...NE winds less than 10 kt. Seas 3 to 4 ft. .WED...NE winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 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 4 to 6 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .OVERNIGHT...N winds less than 10 kt, becoming variable winds less than 10 kt. Seas 4 to 6 ft. .MON...Variable winds less than 10 kt. Seas 4 to 6 ft. .MON NIGHT...Variable winds less than 10 kt. Seas 4 to 6 ft. .TUE...S winds less than 10 kt. Seas 4 to 6 ft. .TUE NIGHT...S winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 4 to 6 ft. .WED...S winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...S winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Seas 4 to 6 ft. .THU...SE winds less than 10 kt. Seas 4 to 6 ft. .THU NIGHT...E winds less than 10 kt. Seas 6 to 8 ft. .FRI...SE winds less than 10 kt. Seas 6 to 8 ft. .FRI NIGHT...E winds less than 10 kt. Seas 5 to 7 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .OVERNIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .MON...E winds 10 to 15 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 5 ft. .TUE NIGHT...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 5 to 7 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...A 1014 mb low pressure near 23N55W will support gale-force winds east of 55W tonight. As the low moves east, strong gale force winds and gusts to storm force could be possible from 27N to 29N and east of 57W late tonight through Mon. Gale winds will likely last through Mon night, then diminishing to fresh to strong winds through Tue morning. This pattern will also support rough to very rough seas east of 70W through mid week. Farther west, a strong cold front will push off the SE United States coast tonight preceded and followed by fresh to near-gale force winds and rough seas. The front will reach from 31N68W to the Turks and Caicos and eastern Cuba Tue morning, and from Bermuda to Puerto Rico Wed morning. By mid week a low pressure system may develop along this front supporting a large area of near-gale to gale force winds and very rough seas between Bermuda and the Bahamas. ATLC waters from 27N to 31N W of 77W .OVERNIGHT...S winds 15 to 25 kt. Seas 6 to 9 ft. .MON...W winds 15 to 25 kt. Seas 6 to 9 ft. .MON NIGHT...NW winds 15 to 25 kt. Seas 7 to 9 ft. .TUE...N winds 15 to 25 kt. Seas 6 to 9 ft. .TUE NIGHT...N winds 10 to 20 kt. Seas 6 to 8 ft. .WED...N winds 10 to 15 kt. Seas 6 to 8 ft. .WED NIGHT...W winds less than 10 kt. Seas 6 to 8 ft. .THU...W winds 10 to 15 kt. Seas 6 to 8 ft. .THU NIGHT...W winds 20 to 30 kt. Seas 5 to 7 ft, building to 7 to 10 ft after midnight. .FRI...N winds 20 to 30 kt. Seas 8 to 12 ft. .FRI NIGHT...NE winds 10 to 15 kt. Seas 7 to 10 ft. ATLC waters from 27N to 31N between 65W and 77W ...GALE CONDITIONS POSSIBLE TUE NIGHT... .OVERNIGHT...SE winds 10 to 20 kt. Seas 6 to 8 ft. .MON...SE winds 10 to 20 kt. Seas 6 to 8 ft. .MON NIGHT...W winds 15 to 25 kt W of 70W, and SE 10 to 20 kt elsewhere. Seas 7 to 10 ft. .TUE...W of 70W, NW winds 15 to 25 kt. Elsewhere, S winds 10 to 20 kt, shifting to W in the afternoon. Seas 8 to 11 ft W of 70W, and 6 to 9 ft elsewhere. .TUE NIGHT...NW winds 20 to 35 kt. Seas 10 to 15 ft. .WED...N winds 20 to 30 kt. Seas 13 to 18 ft. .WED NIGHT...N winds 15 to 25 kt. Seas 11 to 16 ft. .THU...NW winds 10 to 20 kt. Seas 8 to 13 ft, subsiding to 7 to 10 ft in the afternoon. .THU NIGHT...W winds 10 to 20 kt. Seas 6 to 9 ft. .FRI...NW winds 15 to 25 kt. Seas 8 to 13 ft. .FRI NIGHT...NW winds 15 to 25 kt. Seas 9 to 14 ft. Bahamas N of 22N .OVERNIGHT...SE winds 10 to 15 kt. Seas 3 ft. .MON...S winds 10 to 20 kt. Seas 3 to 4 ft. .MON NIGHT...NW winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...N winds 10 to 20 kt. Seas 4 to 6 ft. .TUE NIGHT...N winds 10 to 20 kt. Seas 5 to 7 ft. .WED...N winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...N winds 10 to 15 kt. Seas 5 to 7 ft. .THU...N winds less than 10 kt. Seas 5 to 7 ft. .THU NIGHT...NW winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 to 5 ft. .FRI...N winds 10 to 20 kt. Seas 3 to 5 ft. .FRI NIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .OVERNIGHT...E winds 10 to 20 kt. Seas 6 to 8 ft. .MON...SE winds 10 to 15 kt. Seas 6 to 8 ft. .MON NIGHT...W winds 10 to 20 kt W of 70W, and SE less than 10 kt elsewhere. Seas 5 to 7 ft. .TUE...NW winds 15 to 25 kt W of 70W, and SW 10 to 20 kt elsewhere. Seas 7 to 10 ft. .TUE NIGHT...NW winds 15 to 25 kt. Seas 9 to 14 ft. .WED...NW winds 15 to 25 kt. Seas 12 to 17 ft. .WED NIGHT...NW winds 15 to 25 kt. Seas 12 to 17 ft. .THU...NW winds 10 to 20 kt. Seas 9 to 14 ft. .THU NIGHT...NW winds 10 to 15 kt. Seas 7 to 10 ft. .FRI...NW winds 10 to 20 kt. Seas 6 to 8 ft. .FRI NIGHT...N winds 10 to 20 kt. Seas 6 to 9 ft. ATLC waters S of 22N W of 65W .OVERNIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. .MON...E winds less than 10 kt. Seas 4 to 6 ft. .MON NIGHT...E winds less than 10 kt. Seas 4 to 6 ft. .TUE...SW winds less than 10 kt, shifting to W in the afternoon. Seas 4 to 6 ft. .TUE NIGHT...NW winds 10 to 20 kt. Seas 6 to 8 ft. .WED...NW winds 10 to 20 kt. Seas 6 to 9 ft. .WED NIGHT...NW winds 10 to 20 kt. Seas 6 to 9 ft. .THU...NW winds 10 to 15 kt. Seas 6 to 9 ft. .THU NIGHT...NW winds less than 10 kt. Seas 6 to 8 ft. .FRI...Variable winds less than 10 kt, becoming NW less than 10 kt in the afternoon. Seas 4 to 6 ft. .FRI NIGHT...NE winds less than 10 kt. Seas 3 to 5 ft. ATLC waters from 19N to 22N between 55W and 65W .OVERNIGHT...N winds 10 to 15 kt. Seas 6 to 8 ft. .MON...N winds 10 to 15 kt. Seas 6 to 9 ft. .MON NIGHT...N winds less than 10 kt. Seas 6 to 9 ft. .TUE...SW winds less than 10 kt. Seas 6 to 9 ft. .TUE NIGHT...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 7 to 10 ft. .THU...SW winds 10 to 15 kt. Seas 7 to 10 ft. .THU NIGHT...SW winds 10 to 15 kt, shifting to W after midnight. Seas 8 to 11 ft. .FRI...SW winds less than 10 kt. Seas 7 to 10 ft. .FRI NIGHT...W winds less than 10 kt in the evening, becoming variable winds less than 10 kt. Seas 6 to 8 ft.