000 FZNT31 KNHC 040934 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 534 AM EDT Mon Sep 4 2017 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 ATLC from 07N to 19N between 55W and 64W .SYNOPSIS...Fresh trades are expected across south central portions of the Caribbean through Tue, with otherwise light to moderate trades elsewhere. Building NE to E swells associated with Hurricane Irma have begun to propagate W and SW across the tropical waters E of Windwards this morning and will build and move through the E Caribbean passages by tonight. By then, tropical storm force and stronger conditions will have moved into the waters N of 15N E of 56W in association Hurricane Irma. Irma is forecast to move into the tropical waters E of the Windwards by this evening and move WNW towards the extreme northern Leewards, reaching near 17.0N 58.6W Tue afternoon, near 17.8N 61.2W Tue night, and near 19.6N 66.8W Wed night. Tropical storm force winds and large swell will spread through the passages of the NE Caribbean Tue night through Wed night as Irma tracks WNW across the Atlc. 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. .TUE...E winds less than 10 kt. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .WED...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .WED NIGHT...E winds 10 to 15 kt. Seas 2 ft or less. .THU...E winds 10 to 15 kt. Seas 2 ft or less. .THU NIGHT...NE winds less than 10 kt. Seas 2 ft or less. .FRI...N winds less than 10 kt. Seas 2 ft or less. Caribbean N of 15N between 72W and 85W .TODAY...E winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...S of 18N, E winds 10 to 15 kt. Elsewhere, E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 ft or less. .TUE...S of 18N, E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt elsewhere. Seas 2 ft or less. .WED...E winds 10 to 15 kt S of 18N, and SE less than 10 kt elsewhere. Seas 2 ft or less. .WED NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .THU...TROPICAL STORM CONDITIONS POSSIBLE. N winds 10 to 15 kt. Seas 3 ft. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. Caribbean from 11N to 15N W of 72W .TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. .TONIGHT...NE winds 10 to 20 kt within 90 nm of coast of Colombia, and E 10 to 15 kt elsewhere. Seas 3 to 4 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .WED...E winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...NE winds less than 10 kt. Seas 3 to 4 ft. .THU...NE winds less than 10 kt. Seas 3 to 5 ft. .THU NIGHT...NW winds less than 10 kt. Seas 3 to 5 ft. .FRI...NW winds 10 to 15 kt. Seas 3 to 4 ft. SW Caribbean S of 11N .TODAY...E winds less than 10 kt. Seas 3 to 4 ft. .TONIGHT...N winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 ft. .TUE...NE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 ft. .TUE NIGHT...NE winds less than 10 kt. Seas 3 ft. .WED...E winds 10 to 15 kt, shifting to W in the afternoon. Seas 3 ft. .WED NIGHT...N winds less than 10 kt. Seas 3 ft. .THU...W winds less than 10 kt. Seas 3 ft. .THU NIGHT...NW winds less than 10 kt. Seas 3 to 4 ft. .FRI...W winds less than 10 kt. Seas 3 to 4 ft. Caribbean between 64W and 72W .TODAY...E winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 10 to 20 kt. Seas 3 ft Gulf of Venezuela, and 4 to 6 ft elsewhere. .WED...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 10 to 15 kt Gulf of Venezuela, and NE 20 to 30 kt elsewhere. Seas 3 ft Gulf of Venezuela, and 4 to 6 ft elsewhere. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. .THU NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .FRI...Variable winds less than 10 kt Gulf of Venezuela, and SE 15 to 25 kt elsewhere. Seas 2 ft or less Gulf of Venezuela, and 3 to 5 ft elsewhere. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W ...HURRICANE WARNING... .TODAY...TROPICAL STORM CONDITIONS. NE winds 15 to 25 kt, increasing to 30 to 40 kt in the afternoon. Seas 8 to 11 ft. .TONIGHT...HURRICANE CONDITIONS EXPECTED. NE winds 80 to 90 kt. Seas 10 to 15 ft, building to 13 to 18 ft after midnight. .TUE...HURRICANE CONDITIONS EXPECTED. NE winds 80 to 95 kt. Seas 15 to 20 ft. .TUE NIGHT...TROPICAL STORM CONDITIONS EXPECTED. SE winds 80 to 100 kt. Seas 17 to 22 ft, building to 15 to 25 ft after midnight. .WED...HURRICANE CONDITIONS POSSIBLE. S winds 80 to 100 kt. Seas 16 to 21 ft, subsiding to 13 to 18 ft in the afternoon. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...TROPICAL STORM CONDITIONS POSSIBLE. .THU NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .FRI...E winds 15 to 25 kt. Seas 6 to 9 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .TODAY...N winds 10 to 20 kt. Seas 6 to 8 ft. .TONIGHT...NW winds 20 to 30 kt. Seas 7 to 10 ft. .TUE...SW winds 20 to 30 kt. Seas 7 to 10 ft. .TUE NIGHT...S winds 20 to 30 kt. Seas 6 to 9 ft. .WED...SE winds 15 to 25 kt. Seas 5 to 7 ft. .WED NIGHT...SE winds 10 to 20 kt. Seas 4 to 6 ft. .THU...E winds 10 to 20 kt. Seas 4 to 6 ft. .THU NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. SYNOPSIS FOR THE SW N ATLC INCLUDING THE BAHAMAS .SYNOPSIS...A weakening frontal trough extending across the waters off of NE Florida will move NE through Tue and allow the central Atlc ridge to build SW to NE Florida through Thu. Building NE to E swells will propagate W across the tropical waters S of 22N through tonight well ahead of Hurricane Irma. Tropical storm force and stronger winds will shift W and NW across the tropical waters S of 21N Tue and Tue night while reaching the offshore waters of the N Leewards Tue afternoon. Major Hurricane Irma is forecast to reach near 17.0N 58.6W Tue afternoon, near 17.8N 61.2W Tues night, near 19.6N 66.8W Wed night, near 21.0N 72.0W Thu night, then near 22.0N 76.5W Fri night. ATLC waters from 27N to 31N W of 77W .TODAY...E winds less than 10 kt. Seas 3 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 ft. .TUE...SE winds 10 kt. Seas 3 to 4 ft. .TUE NIGHT...SE winds 10 to 15 kt. Seas 3 to 5 ft. .WED...S winds 10 to 15 kt, shifting to SW in the afternoon. Seas 4 to 5 ft. .WED NIGHT...S winds less than 10 kt. Seas 4 to 6 ft. .THU...SW winds less than 10 kt. Seas 6 to 8 ft. .THU NIGHT...E winds less than 10 kt, shifting to NE after midnight. Seas 7 to 10 ft. .FRI...TROPICAL STORM CONDITIONS POSSIBLE. ATLC WATERS FROM 27N TO 31N BETWEEN 65W AND 77W .TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .TUE...E winds 10 to 15 kt. Seas 4 to 6 ft. .TUE NIGHT...SE winds 10 to 15 kt. Seas 5 to 7 ft. .WED...SE winds 10 to 20 kt. Seas 6 to 9 ft. .WED NIGHT...SE winds 10 to 20 kt. Seas 7 to 10 ft W of 70W, and 8 to 13 ft elsewhere. .THU...SE winds 10 to 20 kt. W of 70W, seas 7 to 10 ft, building to 8 to 13 ft in the afternoon. Elsewhere, seas 9 to 14 ft. .THU NIGHT...SE winds 10 to 20 kt. Seas 10 to 15 ft. .FRI...TROPICAL STORM CONDITIONS POSSIBLE. Bahamas N of 22N .TODAY...E winds 10 to 15 kt. Seas 2 ft or less. .TONIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .TUE...E winds 10 to 15 kt. Seas 3 ft. .TUE NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 to 4 ft. .WED...SE winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .THU...HURRICANE CONDITIONS POSSIBLE. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. ATLC waters from 22N to 27N between 65W and the Bahamas .TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .TUE...E winds 10 to 15 kt. Seas 5 to 7 ft. .TUE NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft W of 70W, and 7 to 10 ft elsewhere. .WED...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 10 to 15 kt W of 70W, and E 20 to 30 kt elsewhere. W of 70W, seas 6 to 9 ft. Elsewhere, seas 8 to 11 ft, building to 10 to 15 ft in the afternoon. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. ATLC waters S of 22N W of 65W .TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .TUE...E winds 10 to 15 kt. Seas 4 to 6 ft. .TUE NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 20 kt. Seas 6 to 9 ft. .WED...HURRICANE CONDITIONS POSSIBLE. E winds 15 to 25 kt, becoming NE 35 to 45 kt in the afternoon. Seas 8 to 11 ft, building to 9 to 14 ft in the afternoon. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. .THU NIGHT...HURRICANE CONDITIONS POSSIBLE. .FRI...HURRICANE CONDITIONS POSSIBLE. ATLC waters from 19N to 22N between 55W and 65W ...TROPICAL STORM WARNING... .TODAY...NE winds 15 to 25 kt. Seas 8 to 11 ft. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. NE winds 25 to 35 kt. Seas 9 to 14 ft. .TUE...TROPICAL STORM CONDITIONS EXPECTED. E winds 30 to 40 kt. Seas 12 to 17 ft. .TUE NIGHT...TROPICAL STORM CONDITIONS EXPECTED. E winds 35 to 45 kt. Seas 15 to 20 ft. .WED...HURRICANE CONDITIONS POSSIBLE. E winds 45 to 55 kt, increasing to 70 to 90 kt in the afternoon. Seas 16 to 26 ft. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...TROPICAL STORM CONDITIONS POSSIBLE. .THU NIGHT...E winds 20 to 30 kt. Seas 8 to 11 ft. .FRI...E winds 15 to 25 kt. Seas 7 to 10 ft.