000 FZNT31 KNHC 272147 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 547 PM EDT Fri Oct 27 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...Low pressure across the W Caribbean has become better organized and is now Potential Tropical Cyclone Eighteen, located near 17.5N 84.5W at 2100Z 1006 MB moving NNW at 5 kt. Maximum sustained winds 35 kt gust to 45 kt. The cyclone will move N to NNE overnight then begin to veer NE early Sat and likely to become a Tropical Storm, and move NE across W Cuba late Sat afternoon, then NE across the Straits of Florida Sat night and through the NW Bahamas Sun. A new 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 .TONIGHT...N winds 15 to 25 kt. Seas 4 to 6 ft. .SAT...NW winds 10 to 20 kt. Seas 4 to 6 ft. .SAT NIGHT...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 4 to 6 ft. .TUE...NE winds 10 to 20 kt. Seas 4 to 6 ft. .TUE NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft. .WED...E winds 10 to 15 kt. Seas 3 to 4 ft. Caribbean N of 15N between 72W and 85W ...TROPICAL STORM WARNING... .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 25 to 35 kt. Seas 3 to 5 ft. .SAT...TROPICAL STORM CONDITIONS EXPECTED. SE winds 20 to 30 kt S of 18N, and S 30 to 40 kt elsewhere. Seas 4 to 6 ft. .SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. S of 18N, SE winds 10 to 20 kt. Elsewhere, SW winds 25 to 35 kt, diminishing to 10 to 20 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 ft. .WED...E winds 10 to 20 kt. Seas 3 ft. Caribbean from 11N to 15N W of 72W .TONIGHT...NE winds 10 to 20 kt. Seas 3 to 4 ft. .SAT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT NIGHT...N winds 10 to 15 kt. Seas 3 ft. .SUN...N winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .MON...NE winds 10 to 15 kt. Seas 2 ft or less. .MON NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less. .TUE...E winds 10 to 15 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .WED...E winds 10 to 15 kt. Seas 3 to 4 ft. SW Caribbean S of 11N .TONIGHT...N winds less than 10 kt. Seas 2 ft or less, building to 3 ft after midnight. .SAT...NW winds 10 to 15 kt. Seas 3 ft. .SAT NIGHT...NW winds 10 to 15 kt. Seas 3 ft. .SUN...NW winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...N winds 10 to 15 kt. Seas 2 ft or less. .MON...NW winds less than 10 kt. Seas 2 ft or less. .MON NIGHT...NW winds less than 10 kt. Seas 2 ft or less. .TUE...W winds less than 10 kt. Seas 2 ft or less. .TUE NIGHT...NW winds less than 10 kt. Seas 2 ft or less. .WED...SW winds less than 10 kt. Seas 2 ft or less. Caribbean between 64W and 72W .TONIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SAT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT NIGHT...E winds 10 to 20 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 20 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 20 kt. Gulf of Venezuela, seas 3 ft in the morning, subsiding to 2 ft or less. Elsewhere, seas 3 to 5 ft. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .TONIGHT...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 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 20 kt. Seas 4 to 6 ft. .WED...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 .TONIGHT...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 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 20 kt. Seas 5 to 7 ft. SYNOPSIS FOR THE SW N ATLC INCLUDING THE BAHAMAS .SYNOPSIS...A cold front extending from near 31N63W to the Turks and Caicos Islands then to E central Cuba will stall across the NE waters tonight, while remainder of front shifts northward through the central Bahamas. Newly formed Potential Tropical Cyclone Eighteen across the W Caribbean this evening expected to move NNE and become a tropical storm late tonight and approach W Cuba, then move NE across W Cuba late Sat afternoon, then NE across the Straits of Florida Sat night and through the NW Bahamas Sun before dissipating Sun afternoon just ahead of an approaching W Atlantic cold front. The front will move off NE Florida and GA early Sun morning and reach from 30N76W to central Cuba by Sun afternoon, from 31N70W to E central Cuba early Mon morning, and begin to stall and weaken from 28N65W to E central Cuba late Mon. Gale force winds are possible ahead of the front late Sun and Mon after the tropical cyclone dissipates. ATLC waters from 27N to 31N W of 77W ...TROPICAL STORM WARNING... .TONIGHT...SE winds 10 to 15 kt. Seas 3 to 4 ft. .SAT...SE winds 10 to 15 kt. Seas 3 to 4 ft. .SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 15 to 25 kt. Seas 4 to 6 ft. .SUN...TROPICAL STORM CONDITIONS POSSIBLE. SW winds 30 to 40 kt, becoming W 20 to 30 kt in the afternoon. Seas 6 to 8 ft. .SUN NIGHT...NW winds 20 to 30 kt. Seas 8 to 11 ft. .MON...N winds 10 to 20 kt. Seas 7 to 10 ft, subsiding to 5 to 7 ft in the afternoon. .MON NIGHT...N winds 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... ...GALE CONDITIONS POSSIBLE... .TONIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 15 kt. Seas 4 to 5 ft. .SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 10 to 20 kt. Seas 4 to 6 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. S winds 35 to 45 kt W of 70W, and SE 15 to 25 kt elsewhere. Seas 7 to 10 ft W of 70W, and 4 to 6 ft elsewhere. .SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. W of 70W, W winds 30 to 40 kt,Seas 8 to 12 ft. Elsewhere, SE winds 15 to 25 kt, becoming S 25 to 35 kt after midnight,Seas 5 to 7 ft, building to 7 to 10 ft after midnight. .MON...TROPICAL STORM CONDITIONS POSSIBLE. .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 15 kt. Seas 4 to 6 ft. .WED...NE winds 10 to 15 kt. Seas 4 to 6 ft. Bahamas N of 22N ...TROPICAL STORM WARNING... .TONIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SAT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 10 to 15 kt. Seas 3 to 4 ft. .SAT NIGHT...TROPICAL STORM CONDITIONS EXPECTED. SE winds 35 to 45 kt. Seas 3 to 5 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. SW winds 35 to 45 kt. Seas 4 to 6 ft. .SUN NIGHT...NW winds 15 to 25 kt. Seas 4 to 6 ft. .MON...N winds 10 to 20 kt. Seas 3 to 4 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...NE winds 10 to 15 kt. Seas 3 to 4 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... .TONIGHT...E winds 10 to 20 kt. Seas 5 to 6 ft. .SAT...E winds less than 10 kt. Seas 4 to 5 ft. .SAT NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 10 to 20 kt. Seas 4 to 5 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. S winds 35 to 45 kt W of 70W, and SE 10 to 20 kt elsewhere. W of 70W, seas 5 to 6 ft, building to 6 to 9 ft in the afternoon. Elsewhere, seas 5 ft. .SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. W of 70W, SW winds 30 to 40 kt, diminishing to 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 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 20 kt. Seas 5 to 6 ft. .WED...E winds 10 to 20 kt. Seas 4 to 6 ft. ATLC waters S of 22N W of 65W .TONIGHT...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 4 to 6 ft. .SUN...SE winds 10 to 15 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 .TONIGHT...E winds 10 to 15 kt. Seas 6 ft. .SAT...E winds 10 to 15 kt. Seas 5 to 6 ft. .SAT NIGHT...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 4 to 5 ft.