000 FZNT31 KNHC 280310 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1110 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...Potential Tropical Cyclone Eighteen, located near 18.2N 84.4W 1005 MB at 0300 UTC moving N at 6 kt. Maximum sustained winds 35 kt gust to 45 kt. The cyclone will move NNE overnight then begin to veer NE early Sat and likely to become a Tropical Storm as it moves NE across W Cuba late Sat afternoon, then NE across the Straits of Florida Sat night and NW Bahamas early 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 .OVERNIGHT...N winds 10 to 20 kt. Seas 4 to 6 ft. .SAT...NW winds 15 to 25 kt. Seas 4 to 6 ft. .SAT NIGHT...NW winds 10 to 20 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 20 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 ...GALE WARNING... .OVERNIGHT...SE winds 25 to 35 kt. Seas 3 to 10 ft. .SAT...SE winds 20 to 30 kt S of 18N, and S 30 to 40 kt elsewhere. Seas 4 to 12 ft. .SAT NIGHT...S of 18N, S winds 10 to 20 kt. Elsewhere, SW winds 30 to 40 kt, diminishing to 15 to 25 kt after midnight. Seas 3 to 4 ft S of 18N, and 5 to 10 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...E winds 10 to 20 kt. Seas 3 to 4 ft. Caribbean from 11N to 15N W of 72W .OVERNIGHT...NE winds 10 to 15 kt. Seas 3 to 4 ft. .SAT...E winds 10 to 15 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...Within 90 nm of coast of Colombia, NE winds 10 to 15 kt. Elsewhere, N winds less than 10 kt, shifting to NE after midnight. Seas 2 ft or less. .MON...NE winds 10 to 15 kt within 90 nm of coast of Colombia, and NE less than 10 kt elsewhere. Seas 2 ft or less. .MON NIGHT...NE winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 ft or less, building to 3 ft after midnight. .TUE...E winds 10 to 15 kt. Seas 3 ft. .TUE NIGHT...NE winds 10 to 15 kt. Seas 3 ft. .WED...E winds 10 to 15 kt. Seas 3 to 4 ft. SW Caribbean S of 11N .OVERNIGHT...N winds less than 10 kt. Seas 3 ft. .SAT...N winds less than 10 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 less than 10 kt, shifting to NW after midnight. Seas 2 ft or less. .MON...NW winds less than 10 kt. Seas 2 ft or less. .MON NIGHT...N winds less than 10 kt. Seas 2 ft or less. .TUE...NW winds less than 10 kt. Seas 2 ft or less. .TUE NIGHT...N winds less than 10 kt. Seas 2 ft or less. .WED...E winds less than 10 kt, shifting to NW in the afternoon. Seas 2 ft or less. Caribbean between 64W and 72W .OVERNIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SAT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SAT NIGHT...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 20 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 .OVERNIGHT...E winds 10 to 20 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 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 .OVERNIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 15 kt. Seas 5 to 7 ft. .SAT NIGHT...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 5 to 7 ft. SYNOPSIS FOR THE SW N ATLC INCLUDING THE BAHAMAS .SYNOPSIS...A cold front extending from near 31N61W to the S central Bahamas will stall and weaken overnight. Newly formed Potential Tropical Cyclone Eighteen across the W Caribbean tonight expected to move NE across W Cuba late Sat afternoon or evening and become a tropical storm, then move NE across the Straits of Florida Sat night, reach the NW Bahamas Sun morning then accelerate NE and exit the N waters early Sun night. A cold 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. Strong to gale force winds are possible ahead of the front Sun through Mon to the S and SE of the tropical cyclone. ATLC waters from 27N to 31N W of 77W ...TROPICAL STORM WARNING... .OVERNIGHT...SE winds 10 to 15 kt. Seas 4 ft. .SAT...SE winds 10 to 15 kt. Seas 3 to 4 ft. .SAT NIGHT...SE winds 15 to 25 kt. Seas 4 to 6 ft. .SUN...TROPICAL STORM CONDITIONS POSSIBLE. W winds 25 to 35 kt, diminishing to 15 to 25 kt in the afternoon. Seas 6 to 9 ft. .SUN NIGHT...NW winds 20 to 30 kt. Seas 8 to 12 ft. .MON...NW 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... .OVERNIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT...E winds 10 to 15 kt. Seas 4 to 5 ft. .SAT NIGHT...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 40 to 50 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 POSSIBLE. W of 70W, SW winds 40 to 50 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. 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 10 to 20 kt. Seas 4 to 6 ft. Bahamas N of 22N ...TROPICAL STORM WARNING... .OVERNIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .SAT...TROPICAL STORM CONDITIONS POSSIBLE. SE winds 10 to 20 kt. Seas 3 ft. .SAT NIGHT...TROPICAL STORM CONDITIONS EXPECTED. SE winds 35 to 45 kt. Seas 3 to 5 ft. .SUN...TROPICAL STORM CONDITIONS EXPECTED. S winds 35 to 45 kt, becoming SW 20 to 30 kt in the afternoon. Seas 4 to 6 ft. .SUN NIGHT...NW winds 15 to 25 kt. Seas 3 to 5 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... .OVERNIGHT...E winds 10 to 15 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 POSSIBLE. S winds 35 to 45 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, 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 5 to 7 ft. .TUE...E winds 10 to 20 kt. Seas 5 to 7 ft. .TUE NIGHT...NE winds 10 to 20 kt. Seas 5 to 6 ft. .WED...E winds 10 to 20 kt. Seas 5 to 6 ft. ATLC waters S of 22N W of 65W .OVERNIGHT...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 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, diminishing to less than 10 kt in the afternoon. 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 .OVERNIGHT...E winds 10 to 20 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 5 ft.