000 FZNT32 KNHC 220231 OFFN21 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1031 PM EDT Thu Sep 21 2017 Marine Weather HF Voice Broadcast for the Gulf of Mexico 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 the Gulf of Mexico .SYNOPSIS...A thermal trough will develop each evening over the NW Yucatan Peninsula, move W-NW across the SW Gulf overnight And dissipate over the SW Gulf waters by late each morning. High pressure will prevail elsewhere through Tue. Gulf of Mexico N of 26N W of 87W .OVERNIGHT...E winds 10 to 15 kt. Seas 3 ft. .FRI...E winds 10 kt. Seas 3 ft. .FRI NIGHT...E winds 10 to 15 kt. Seas 3 ft. .SAT...E winds 10 to 15 kt. Seas 3 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 ft. .SUN...E winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...SE winds 10 kt. Seas 3 ft. .MON...SE winds 10 kt. Seas 3 ft. .MON NIGHT...SE winds 10 to 15 kt. Seas 3 ft. .TUE...SE winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 2 ft or less, building to 3 ft after midnight. Gulf of Mexico from 22N to 26N W of 87W .OVERNIGHT...E winds 10 to 15 kt. Seas 3 ft. .FRI...E winds less than 10 kt. Seas 3 ft. .FRI NIGHT...E winds less than 10 kt. Seas 3 ft. .SAT...E winds less than 10 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .SAT NIGHT...E winds 10 kt. Seas 2 ft or less, building to 3 ft after midnight. .SUN...SE winds less than 10 kt. Seas 3 ft in the morning, subsiding to 2 ft or less. .SUN NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 ft or less, building to 3 ft after midnight. .MON...SE winds 10 to 15 kt. Seas 3 to 4 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .TUE...SE winds 10 to 15 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 20 kt. Seas 4 to 6 ft. SW Gulf of Mexico S of 22N W of 87W .OVERNIGHT...E winds less than 10 kt within 60 nm of coast of Veracruz, and NE 10 to 15 kt elsewhere. Seas 2 ft or less, building to 3 ft after midnight. .FRI...Within 60 nm of coast of Veracruz, SE winds less than 10 kt. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 2 ft or less. .FRI NIGHT...Within 60 nm of coast of Veracruz, E winds less than 10 kt. Elsewhere, 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. .SAT...Within 60 nm of coast of Veracruz, SE winds less than 10 kt. Elsewhere, E winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 ft in the morning, subsiding to 2 ft or less. .SAT NIGHT...NE winds less than 10 kt, shifting to E after midnight. Seas 2 ft or less. .SUN...E winds 10 to 15 kt. Seas 2 ft or less. .SUN NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 2 ft or less, building to 3 ft after midnight. .MON...E winds 10 to 15 kt. Seas 3 to 4 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 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. Gulf of Mexico E of 87W .OVERNIGHT...NE winds less than 10 kt. Seas 2 ft or less. .FRI...NE winds 10 kt. Seas 2 ft or less. .FRI NIGHT...NE winds 10 kt. Seas 2 ft or less, building to 3 ft after midnight. .SAT...NE winds less than 10 kt. Seas 2 ft or less. .SAT NIGHT...E winds 10 kt. Seas 2 ft or less, building to 3 ft after midnight. .SUN...E winds less than 10 kt. Seas 2 ft or less. .SUN NIGHT...E winds less than 10 kt. Seas 2 ft or less. .MON...SE winds less than 10 kt. Seas 2 ft or less. .MON NIGHT...E winds less than 10 kt. Seas 2 ft or less. .TUE...E winds less than 10 kt. Seas 2 ft or less. .TUE NIGHT...E winds less than 10 kt. Seas 2 ft or less.