640 FZNT31 KNHC 180403 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1203 AM 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...Fresh to strong northerly winds and rough seas will continue to follow a cold front that extends from Camaguey, Cuba to NE Honduras. The front is forecast to reach from eastern Cuba to NE Nicaragua Tue morning before its tail dissipates Tue night into 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 Tue through Wed evening. In the south-central and portions of the SW Caribbean, fresh to strong NW to E winds will prevail through the weekend. High pressure will build near the Bahamas over the weekend and trade winds will increase across the region, with near gale-force winds possibly developing offshore Colombia, and strong winds south of Hispaniola. NW Caribbean W of 85W .OVERNIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. .TUE...NE winds 10 to 20 kt. Seas 6 to 9 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 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 3 to 5 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. Caribbean N of 15N between 72W and 85W .OVERNIGHT...N winds 10 to 20 kt. Seas 3 ft S of 18N, and 4 to 6 ft elsewhere. .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...E winds 10 to 20 kt. Seas 3 to 5 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...NE winds 10 to 15 kt. Seas 3 to 5 ft. .FRI...NE winds 10 to 15 kt. Seas 3 to 5 ft. .FRI NIGHT...NE winds 10 to 15 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 4 to 6 ft. Caribbean from 11N to 15N W of 72W .OVERNIGHT...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 4 to 6 ft. .TUE NIGHT...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...NE winds 10 to 20 kt within 90 nm of coast of Colombia, and NE 10 to 15 kt elsewhere. 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...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 15 to 25 kt. Seas 6 to 9 ft. .SAT NIGHT...NE winds 15 to 25 kt. Seas 7 to 10 ft. SW Caribbean S of 11N .OVERNIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. .TUE...N winds 10 to 20 kt. Seas 4 to 6 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...NE winds 10 to 20 kt. Seas 6 to 8 ft. .FRI NIGHT...NE winds 10 to 20 kt. Seas 6 to 9 ft. .SAT...NE winds 10 to 20 kt. Seas 6 to 9 ft. .SAT NIGHT...NE winds 10 to 20 kt. Seas 7 to 10 ft. Caribbean between 64W and 72W .OVERNIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...NE winds 10 to 15 kt Gulf of Venezuela, and E less than 10 kt elsewhere. Seas 3 ft. .TUE NIGHT...NE winds 10 to 20 kt Gulf of Venezuela, and NE less than 10 kt elsewhere. Seas 3 ft. .WED...NE winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .THU...E winds 10 to 20 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 5 to 7 ft. .SAT 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 .OVERNIGHT...NW 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. Seas 4 to 6 ft. .WED...S winds 10 to 15 kt. Seas 4 to 6 ft. .WED NIGHT...SE 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 8 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. 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. .TUE...SE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. 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. .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. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...A 1007 mb low pres near 25N57W is producing strong to near gale-force E-SE winds north of 25N and between 44W and 61W. Rough to very rough in the area described. These winds and seas will persist in the northern semicircle as the low moves north and exits the forecast waters by Wed morning. Strong to near gale- force winds will precede and continue to follow a cold front that extends from 31N73W to Camaguey, Cuba. The front will reach from 31N68W to the Turks and Caicos and eastern Cuba Tue morning, and from 31N60W to Puerto Rico Wed morning. A low pressure system is forecast to develop along this front Tue night, which will support the development of gale-force winds and very rough seas between Bermuda and the Bahamas Tue night through Wed. Afterward, winds and seas will gradually diminish across the region through Thu night. Looking ahead, a third strong front is forecast to come off the Florida NE coast Thu. ATLC waters from 27N to 31N W of 77W .OVERNIGHT...NW winds 15 to 25 kt. Seas 7 to 10 ft. .TUE...N winds 15 to 25 kt. Seas 6 to 9 ft. .TUE NIGHT...N winds 10 to 15 kt. Seas 6 to 9 ft. .WED...N winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 6 to 8 ft. .WED NIGHT...W winds less than 10 kt. Seas 6 to 9 ft. .THU...SW winds 10 to 20 kt. Seas 6 to 8 ft. .THU NIGHT...W winds 20 to 30 kt. Seas 7 to 10 ft. .FRI...N winds 20 to 30 kt. Seas 8 to 11 ft. .FRI NIGHT...N winds 10 to 15 kt, shifting to E after midnight. Seas 6 to 9 ft. .SAT...S winds less than 10 kt, shifting to SW in the afternoon. Seas 4 to 6 ft. .SAT NIGHT...SW winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Seas 3 to 5 ft. ATLC waters from 27N to 31N between 65W and 77W ...GALE WARNING... .OVERNIGHT...W winds 15 to 25 kt W of 70W, and SE 10 to 20 kt elsewhere. Seas 7 to 10 ft. .TUE...NW winds 15 to 25 kt W of 70W, and W 10 to 20 kt elsewhere. Seas 8 to 13 ft W of 70W, and 7 to 9 ft elsewhere. .TUE NIGHT...NW winds 25 to 35 kt. Seas 11 to 16 ft. .WED...NW winds 25 to 35 kt W of 70W, and NW 20 to 30 kt elsewhere. Seas 13 to 18 ft. .WED NIGHT...NW winds 20 to 30 kt. Seas 11 to 16 ft. .THU...NW winds 10 to 20 kt. Seas 8 to 13 ft. .THU NIGHT...W winds 10 to 20 kt. Seas 7 to 10 ft. .FRI...W winds 15 to 25 kt. Seas 8 to 11 ft. .FRI NIGHT...NW winds 15 to 25 kt. Seas 8 to 11 ft. .SAT...N winds 10 to 15 kt, shifting to SW in the afternoon. Seas 8 to 11 ft. .SAT NIGHT...SW winds less than 10 kt. Seas 6 to 9 ft. Bahamas N of 22N .OVERNIGHT...N winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...N winds 15 to 25 kt. Seas 4 to 6 ft. .TUE NIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. .WED...N winds 10 to 15 kt, shifting to NE in the afternoon. Seas 4 to 6 ft. .WED NIGHT...N winds less than 10 kt. Seas 5 to 7 ft. .THU...N winds less than 10 kt in the morning, becoming variable winds less than 10 kt. Seas 4 to 6 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 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 ft. ATLC waters from 22N to 27N between 65W and the Bahamas .OVERNIGHT...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 W of 70W, and W 20 to 30 kt elsewhere. Seas 12 to 17 ft. .WED NIGHT...NW winds 20 to 30 kt. Seas 12 to 17 ft. .THU...NW winds 10 to 20 kt. Seas 10 to 15 ft, subsiding to 9 to 12 ft in the afternoon. .THU NIGHT...W winds 10 to 15 kt. Seas 8 to 11 ft. .FRI...W winds 10 to 15 kt. Seas 6 to 8 ft. .FRI NIGHT...N winds 10 to 15 kt. Seas 6 to 9 ft. .SAT...NE winds 10 to 15 kt, shifting to E in the afternoon. Seas 6 to 8 ft. .SAT NIGHT...E winds less than 10 kt. Seas 6 to 8 ft. ATLC waters S of 22N W of 65W .OVERNIGHT...NE winds less than 10 kt. Seas 3 to 5 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 8 ft. .WED NIGHT...NW winds 10 to 15 kt. Seas 6 to 9 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 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. .SAT...E winds less than 10 kt. Seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. ATLC waters from 19N to 22N between 55W and 65W .OVERNIGHT...NW winds 10 kt. Seas 7 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...W 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...SW winds less than 10 kt. Seas 7 to 10 ft. .FRI NIGHT...SW winds less than 10 kt in the evening, becoming variable winds less than 10 kt. Seas 6 to 8 ft. .SAT...E winds less than 10 kt. Seas 4 to 6 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 4 to 5 ft.