000 FZNT31 KNHC 280917 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 517 AM EDT Sat Oct 28 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...Potential Tropical Cyclone Eighteen, located near 19.6N 84.2W 1005 mb at 0900 UTC moving N at 10 kt. Maximum sustained winds 30 kt gust to 40 kt. The cyclone will move NE and likely will become a tropical storm as it moves across W Cuba this afternoon reaching 21.7N 82.9W. The potential tropical storm will continue NE of the area across the Straits of Florida tonight and NW Bahamas early Sun. A cold front will penetrate the NW Caribbean in the wake of cyclone, bringing fresh northerly winds and seas to 8 ft to the Yucatan Channel. Winds and seas will diminish elsewhere through early next week as high pressure ridge N of the region is weakened by the emerging tropical cyclone. NW Caribbean W of 85W .TODAY...NW winds 10 to 20 kt. Seas 4 to 6 ft. .TONIGHT...NW winds 15 to 25 kt. Seas 4 to 6 ft. .SUN...NW winds 10 to 20 kt. Seas 4 to 6 ft. .SUN NIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. .MON...N winds 10 to 20 kt. Seas 4 to 6 ft. .MON NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...NE winds 10 to 20 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. Caribbean N of 15N between 72W and 85W ...TROPICAL STORM WARNING... .TODAY...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 20 to 30 kt S of 18N, and S 25 to 35 kt elsewhere. Seas 4 to 6 ft. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. S of 18N, S winds 10 to 20 kt. Elsewhere, SW winds 25 to 35 kt, becoming W 15 to 25 kt after midnight. Seas 3 to 4 ft S of 18N, and 5 to 7 ft elsewhere. .SUN...W winds 10 to 20 kt. Seas 3 to 5 ft. .SUN NIGHT...N winds 10 to 20 kt. Seas 3 to 4 ft. .MON...NE winds 10 to 20 kt. Seas 3 to 5 ft. .MON NIGHT...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...NE winds 10 to 20 kt. Seas 3 to 5 ft. .TUE NIGHT...NE winds 10 to 20 kt. Seas 3 to 4 ft. .WED...NE winds 10 to 20 kt. Seas 3 to 4 ft. Caribbean from 11N to 15N W of 72W .TODAY...E winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...N winds 10 to 15 kt. Seas 3 ft. .SUN...N winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...N winds 10 to 15 kt. Seas 2 ft or less. .MON...NE winds 10 to 20 kt. Seas 2 ft or less. .MON NIGHT...NE winds 10 to 20 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 10 to 15 kt. Seas 3 ft. .WED...NE winds 10 to 15 kt. Seas 3 to 4 ft. SW Caribbean S of 11N .TODAY...N winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 ft. .TONIGHT...NW winds 10 to 15 kt. Seas 3 ft. .SUN...NW winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...NW winds less than 10 kt. Seas 2 ft or less. .MON...NW winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...NW winds less than 10 kt. Seas 2 ft or less. .TUE...W winds 10 to 15 kt. Seas 2 ft or less. .TUE NIGHT...NE winds less than 10 kt. Seas 2 ft or less. .WED...NE winds 10 to 15 kt. Seas 2 ft or less. Caribbean between 64W and 72W .TODAY...E winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SUN...E winds 10 to 15 kt. Seas 3 to 4 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .MON...E winds 10 to 15 kt. Seas 3 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 15 kt. Gulf of Venezuela, seas 2 ft or less, building to 3 ft after midnight. Elsewhere, seas 3 to 5 ft. .WED...E winds 10 to 15 kt. 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 .TODAY...E winds 10 to 15 kt. Seas 4 to 6 ft. .TONIGHT...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 15 kt. Seas 4 to 6 ft. .MON...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON NIGHT...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...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED...E winds 10 to 15 kt. Seas 4 to 6 ft. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .TODAY...E winds 10 to 15 kt. Seas 5 to 7 ft. .TONIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. .SUN...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...E winds 10 to 15 kt. Seas 4 to 6 ft. .MON NIGHT...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...E winds 10 to 15 kt. Seas 4 to 6 ft. .WED...E winds 10 to 15 kt. Seas 4 to 6 ft. SYNOPSIS FOR THE SW N ATLC INCLUDING THE BAHAMAS .SYNOPSIS...A stationary front extending 24N E of the central Bahamas will dissipate today ahead of a potential tropical storm emerging from the NW Caribbean. Potential Tropical Cyclone Eighteen, located near 19.6N 84.2W 1005 mb at 0900 UTC moving N at 10 kt. Maximum sustained winds 30 kt gust to 40 kt. The cyclone will move NE and likely will become a tropical storm as it moves across W Cuba reaching 21.7N 82.9W this afternoon, then reach 24.9N 80.1W tonight off the Upper Florida Keys ahead of a cold front moving through the Gulf of Mexico. The potential tropical storm will pass over the northern Bahamas early Sun, and reach near 28.7N 76.5W by Sun afternoon before becoming an extratropical low ahead N of the area ahead of the front. The front will follow in the wake of the potential tropical storm, reaching from Bermuda to the Windward Passage by Mon afternoon then stalling and weakening through mid week. ATLC waters from 27N to 31N W of 77W ...TROPICAL STORM WARNING... .TODAY...SE winds 10 to 15 kt. Seas 3 to 4 ft. .TONIGHT...SE winds 20 to 30 kt. Seas 4 to 6 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. SE winds 30 to 40 kt, shifting to NW in the afternoon. Seas 6 to 9 ft. .SUN NIGHT...NW winds 20 to 30 kt. Seas 8 to 12 ft. .MON...NW winds 15 to 25 kt, diminishing to 10 to 15 kt in the afternoon. Seas 7 to 10 ft, subsiding to 5 to 7 ft in the afternoon. .MON NIGHT...N winds less than 10 kt. Seas 4 to 6 ft. .TUE...NE winds less than 10 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. ATLC WATERS FROM 27N TO 31N BETWEEN 65W AND 77W ...TROPICAL STORM WARNING... .TODAY...E winds 10 to 15 kt. Seas 4 to 5 ft. .TONIGHT...SE winds 15 to 25 kt W of 70W, and E 10 to 20 kt elsewhere. Seas 4 to 6 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. W of 70W, S winds 25 to 35 kt, increasing to 35 to 45 kt in the afternoon. Elsewhere, SE winds 15 to 25 kt. Seas 7 to 10 ft W of 70W, and 4 to 6 ft elsewhere. .SUN NIGHT...TROPICAL STORM CONDITIONS EXPECTED. W of 70W, SW winds 35 to 45 kt, becoming W 20 to 30 kt after midnight,Seas 8 to 12 ft. Elsewhere, S winds 20 to 30 kt,Seas 5 to 7 ft, building to 7 to 10 ft after midnight. .MON...W of 70W, NW winds 15 to 25 kt, diminishing to 10 to 15 kt in the afternoon. Elsewhere, SW winds 20 to 30 kt, becoming W 10 to 20 kt in the afternoon. Seas 8 to 11 ft. .MON NIGHT...N winds 10 to 15 kt. Seas 6 to 9 ft. .TUE...NE winds 10 to 15 kt. Seas 5 to 7 ft. .TUE NIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. .WED...NE winds 15 to 25 kt W of 70W, and E 10 to 20 kt elsewhere. Seas 5 to 7 ft. Bahamas N of 22N ...TROPICAL STORM WARNING... .TODAY...SE winds 10 to 20 kt. Seas 3 ft. .TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. SE winds 30 to 40 kt. Seas 3 to 5 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. SW winds 30 to 40 kt. Seas 4 to 6 ft. .SUN NIGHT...NW winds 15 to 25 kt. Seas 3 to 5 ft. .MON...N winds 10 to 15 kt. Seas 3 to 4 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...NE winds 10 to 20 kt. Seas 3 ft. .TUE NIGHT...NE winds 10 to 20 kt. Seas 3 to 4 ft. .WED...NE winds 10 to 20 kt. Seas 3 to 4 ft. ATLC waters from 22N to 27N between 65W and the Bahamas ...TROPICAL STORM WARNING... .TODAY...SE winds less than 10 kt, shifting to E in the afternoon. Seas 4 to 5 ft. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 15 to 25 kt W of 70W, and E 10 to 15 kt elsewhere. Seas 4 to 5 ft. .SUN...TROPICAL STORM CONDITIONS POSSIBLE. S winds 30 to 40 kt W of 70W, and SE 10 to 20 kt elsewhere. Seas 6 to 9 ft W of 70W, and 5 to 6 ft elsewhere. .SUN NIGHT...W of 70W, SW winds 20 to 30 kt, becoming W 10 to 20 kt after midnight. Elsewhere, S winds 10 to 20 kt. Seas 6 to 9 ft W of 70W, and 5 to 6 ft elsewhere. .MON...W winds 10 to 20 kt. Seas 5 to 7 ft. .MON NIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. .TUE...E winds 10 to 20 kt. Seas 5 to 7 ft. .TUE NIGHT...E winds 10 to 20 kt. Seas 5 to 7 ft. .WED...W of 70W, E winds 15 to 25 kt. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 6 ft. ATLC waters S of 22N W of 65W .TODAY...E winds 10 to 15 kt. Seas 4 to 6 ft. .TONIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. .SUN...SE winds 10 to 20 kt. Seas 3 to 5 ft. .SUN NIGHT...S winds 10 to 15 kt. Seas 3 to 5 ft. .MON...SW 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 20 kt. Seas 3 to 5 ft. .WED...E winds 10 to 15 kt. Seas 3 to 5 ft. ATLC waters from 19N to 22N between 55W and 65W .TODAY...E winds 10 to 15 kt. Seas 5 to 6 ft. .TONIGHT...E winds 10 to 15 kt. Seas 5 ft. .SUN...E winds 10 to 15 kt. Seas 5 ft. .SUN NIGHT...E winds less than 10 kt. Seas 5 to 6 ft. .MON...E winds less than 10 kt. Seas 5 to 6 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 5 to 6 ft. .TUE...E winds 10 to 15 kt. Seas 5 to 6 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 5 to 6 ft. .WED...E winds 10 to 15 kt. Seas 5 to 6 ft.