000 FZNT31 KNHC 230923 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 523 AM EDT Thu Sep 23 2021 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 Atlantic from 07N to 19N between 55W and 64W .SYNOPSIS...Tropical Depression Eighteen is well to the east near 10.5N 36.4W 1008 mb at 0900 UTC, moving W at 13 kt. Maximum sustained winds are 30 kt with gusts 40 kt. Eighteen will will continue to intensify as it moves across the Atlantic, becoming a hurricane near 13N47W by Sat afternoon, and reaching 55W east of the Leeward Islands by Mon. Meanwhile, moderate trade winds will persist over much of the Caribbean into early next week, becoming fresh over the south- central Caribbean starting Fri night as high pressure builds east of the Bahamas. NW Caribbean W of 85W .TODAY...N winds less than 10 kt. Seas 2 ft or less. .TONIGHT...E winds less than 10 kt. Seas 2 ft or less. .FRI...Variable winds less than 10 kt, becoming E less than 10 kt in the afternoon. Seas 2 ft or less. .FRI NIGHT...E winds less than 10 kt. Seas 2 ft or less. .SAT...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 2 ft or less. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 ft. .SUN...E winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 3 ft. .MON...E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 ft. Caribbean N of 15N between 72W and 85W .TODAY...S of 18N, E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Elsewhere, E winds less than 10 kt. Seas 2 ft or less. .TONIGHT...S of 18N, E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Elsewhere, E winds less than 10 kt. Seas 2 ft or less. .FRI...E winds 10 to 15 kt S of 18N, and SE less than 10 kt elsewhere. Seas 2 ft or less. .FRI NIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt elsewhere. Seas 2 ft or less, building to 3 ft after midnight. .SAT...S of 18N, E winds 10 to 20 kt. Elsewhere, E winds less than 10 kt, increasing to 10 to 15 kt in the afternoon. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SAT NIGHT...E winds 10 to 20 kt S of 18N, and E less than 10 kt elsewhere. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SUN...E winds 10 to 20 kt S of 18N, and NE less than 10 kt elsewhere. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SUN NIGHT...NE winds 10 to 15 kt. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .MON...E winds 10 to 15 kt S of 18N, and NE less than 10 kt elsewhere. Seas 3 ft. Caribbean from 11N to 15N W of 72W .TODAY...E winds 10 to 15 kt. Seas 3 ft. .TONIGHT...NE winds 10 to 15 kt. Seas 3 ft. .FRI...E winds 10 to 15 kt. Seas 3 to 4 ft. .FRI NIGHT...E winds 10 to 20 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. .SUN...E winds 15 to 25 kt within 90 nm of coast of Colombia, and E 10 to 20 kt elsewhere. Seas 4 to 6 ft. .SUN NIGHT...NE winds 15 to 25 kt. Seas 4 to 6 ft. .MON...NE winds 15 to 25 kt. Seas 4 to 6 ft. SW Caribbean S of 11N .TODAY...NW winds less than 10 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .TONIGHT...NW winds less than 10 kt. Seas 2 ft or less. .FRI...SE winds less than 10 kt. Seas 2 ft or less. .FRI NIGHT...NE winds less than 10 kt. Seas 2 ft or less. .SAT...NE winds less than 10 kt. Seas 2 ft or less. .SAT NIGHT...NE winds 10 to 20 kt. Seas 2 ft or less, building to 3 to 5 ft after midnight. .SUN...NE winds 10 to 20 kt. Seas 3 to 5 ft. .SUN NIGHT...NE winds 10 to 20 kt. Seas 4 to 6 ft. .MON...NE winds 10 to 20 kt. Seas 4 to 6 ft. Caribbean between 64W and 72W .TODAY...Gulf of Venezuela, SE winds 10 to 15 kt, shifting to W in the afternoon. Elsewhere, SE winds 10 to 20 kt. Seas 3 to 4 ft. .TONIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .FRI...SE winds 10 to 20 kt. Seas 3 to 4 ft. .FRI NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SAT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SAT NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 20 kt. Seas 3 to 5 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .MON...E winds 10 to 20 kt. Seas 3 to 4 ft. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W .TODAY...SE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 to 5 ft. .TONIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 4 to 6 ft. .FRI...SE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 6 ft. .FRI NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. 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 3 to 5 ft. .SUN...E winds less than 10 kt. Seas 3 to 5 ft. .SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...HURRICANE CONDITIONS POSSIBLE. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W .TODAY...E winds 10 to 15 kt. Seas 3 to 5 ft. .TONIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .FRI...E winds 10 to 15 kt. Seas 4 to 6 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .SAT...E winds 10 to 15 kt. Seas 4 to 6 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 15 kt. Seas 4 to 6 ft. .SUN NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 4 to 6 ft. .MON...HURRICANE CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 4 to 6 ft. Synopsis for the the SW N Atlantic including the Bahamas .SYNOPSIS...1008 mb low pressure, the remnant low of Peter, is near 22N67W and will dissipate as it drifts northeast of the region through Fri. Meanwhile, a cold front moving off the northeast Florida coast this morning will stall from 31N77W to near Fort Pierce, Florida by tonight, then dissipate through early Sun just before a second weak front possibly moves into the region early next week. Farther east, Tropical Depression Eighteen is near 10.5N 36.4W 1008 mb at 0900 UTC moving W at 13 kt. Maximum sustained winds are 30 kt with gusts 40 kt. Eighteen will will continue to intensify as it moves across the Atlantic, becoming a hurricane near 13N47W by Sat afternoon, and reaching 55W east of the Leeward Islands by Mon. ATLC waters from 27N to 31N W of 77W .TODAY...SW winds 10 to 15 kt. Seas 4 to 5 ft. .TONIGHT...NW winds 10 to 15 kt, shifting to W after midnight. Seas 4 to 6 ft. .FRI...N winds 10 to 15 kt. Seas 4 to 5 ft. .FRI NIGHT...N winds 10 to 15 kt. Seas 4 to 5 ft. .SAT...N winds 10 to 15 kt. Seas 4 to 5 ft. .SAT NIGHT...N winds 10 to 15 kt. Seas 4 to 5 ft. .SUN...N winds 10 to 15 kt. Seas 4 ft. .SUN NIGHT...NE winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Seas 3 to 4 ft. .MON...NE winds 10 to 15 kt. Seas 3 to 4 ft. ATLC waters from 27N to 31N between 65W and 77W .TODAY...SE winds 10 to 20 kt. Seas 6 to 7 ft. .TONIGHT...W of 70W, SE winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Elsewhere, E winds 10 to 20 kt. Seas 5 to 6 ft. .FRI...E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 6 ft. .FRI NIGHT...Variable winds less than 10 kt W of 70W, and N less than 10 kt elsewhere. Seas 4 to 6 ft. .SAT...W winds less than 10 kt. Seas 4 to 6 ft. .SAT NIGHT...W winds 10 to 15 kt W of 70W, and W less than 10 kt elsewhere. Seas 4 to 5 ft. .SUN...NW winds 10 to 15 kt W of 70W, and W less than 10 kt elsewhere. Seas 4 to 5 ft. .SUN NIGHT...W of 70W, N winds 10 to 15 kt, shifting to NE after midnight. Elsewhere, NW winds less than 10 kt. Seas 3 to 4 ft. .MON...NE winds 10 to 15 kt W of 70W, and S less than 10 kt elsewhere. Seas 3 to 4 ft. Bahamas N of 22N .TODAY...SE winds less than 10 kt. Seas 3 ft. .TONIGHT...E winds less than 10 kt. Seas 3 ft. .FRI...S winds less than 10 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .FRI NIGHT...SE winds less than 10 kt. Seas 2 ft or less. .SAT...SE winds less than 10 kt. Seas 2 ft or less. .SAT NIGHT...NE winds less than 10 kt. Seas 2 ft or less. .SUN...N winds 10 to 15 kt. Seas 2 ft or less. .SUN NIGHT...NE winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. .MON...N winds 10 to 15 kt. Seas 2 ft or less. ATLC waters from 22N to 27N between 65W and the Bahamas .TODAY...NE winds 10 to 15 kt W of 70W, and E 15 to 25 kt elsewhere. Seas 6 to 7 ft. .TONIGHT...NE winds 10 to 20 kt. Seas 5 to 7 ft. .FRI...N winds less than 10 kt W of 70W, and N 10 to 15 kt elsewhere. Seas 4 to 6 ft. .FRI NIGHT...W of 70W, Variable winds less than 10 kt. Elsewhere, NW winds 10 to 15 kt, shifting to N after midnight. Seas 4 to 5 ft. .SAT...NE winds less than 10 kt, shifting to SW in the afternoon. Seas 4 to 5 ft. .SAT NIGHT...NW winds less than 10 kt in the evening, becoming variable winds less than 10 kt. Seas 4 to 5 ft. .SUN...W of 70W, W winds less than 10 kt, shifting to NW in the afternoon. Elsewhere, Variable winds less than 10 kt. Seas 4 ft. .SUN NIGHT...W of 70W, E winds 10 to 15 kt. Elsewhere, Variable winds less than 10 kt, becoming E less than 10 kt after midnight. Seas 3 to 4 ft. .MON...E winds less than 10 kt. Seas 3 ft. ATLC waters S of 22N W of 65W .TODAY...S winds 10 to 20 kt. Seas 4 to 6 ft. .TONIGHT...SE winds 10 to 20 kt. Seas 3 to 5 ft. .FRI...SE winds 10 to 15 kt. Seas 3 to 5 ft. .FRI NIGHT...E winds less than 10 kt. Seas 3 to 5 ft. .SAT...SE winds less than 10 kt. Seas 3 to 4 ft. .SAT NIGHT...NE winds 10 to 15 kt, shifting to E after midnight. Seas 3 to 4 ft. .SUN...E winds less than 10 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, diminishing to less than 10 kt in the afternoon. Seas 3 ft. ATLC waters from 19N to 22N between 55W and 65W .TODAY...SE winds 10 to 20 kt. Seas 5 to 7 ft. .TONIGHT...SE winds 10 to 20 kt. Seas 5 to 6 ft. .FRI...SE winds 10 to 15 kt. Seas 5 to 6 ft. .FRI NIGHT...SE winds less than 10 kt. Seas 5 to 6 ft. .SAT...SE winds 10 kt. Seas 5 to 6 ft. .SAT NIGHT...E winds less than 10 kt. Seas 4 to 5 ft. .SUN...E winds less than 10 kt. Seas 4 to 5 ft. .SUN NIGHT...E winds less than 10 kt. Seas 3 to 5 ft. .MON...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 4 to 6 ft.