000 FZNT32 KNHC 201431 OFFN21 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 931 AM EST Thu Dec 20 2018 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 strong cold front extends from a 1002 mb low pressure system centered over southeastern Louisiana to 26N89W to 22N93W and to 18N95W. Numerous showers and thunderstorms are along and ahead of the front. The low pressure system will strengthen as it lifts north-northeast through Fri night, with the cold front quickly moving east of the Gulf tonight. Strong to gale force southerly winds will develop ahead of the front today, followed by westerly gale force winds behind the front, with very large seas expected to build over the east-central waters tonight and Fri. Scattered showers are expected behind the front. High pres will shift eastward across the central gulf on Sat, then move across the Florida Panhandle on Sun. Gulf of Mexico N of 26N W of 87W ...GALE WARNING... .TODAY...NW winds 20 to 30 kt. Seas 5 to 7 ft, building to 8 to 11 ft in the afternoon. .TONIGHT...NW winds 25 to 35 kt. Seas 12 to 17 ft. .FRI...NW winds 25 to 35 kt. Seas 13 to 18 ft, subsiding to 10 to 15 ft in the afternoon. .FRI NIGHT...NW winds 15 to 25 kt, shifting to W 10 to 15 kt after midnight. Seas 8 to 11 ft, subsiding to 6 to 8 ft after midnight. .SAT...S winds 10 to 15 kt. Seas 4 to 6 ft. .SAT NIGHT...S winds 10 to 15 kt. Seas 3 to 5 ft. .SUN...S winds 10 to 15 kt. Seas 3 to 4 ft. .SUN NIGHT...Variable winds less than 10 kt, becoming SE 10 kt after midnight. 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, shifting to SE after midnight. Seas 2 ft or less, building to 3 ft after midnight. Gulf of Mexico from 22N to 26N W of 87W ...GALE WARNING... .TODAY...NW winds 20 to 30 kt. Seas 5 to 7 ft, building to 8 to 11 ft in the afternoon. .TONIGHT...NW winds 25 to 35 kt. Seas 12 to 17 ft. .FRI...NW winds 20 to 30 kt. Seas 11 to 16 ft. .FRI NIGHT...W winds 10 to 20 kt. Seas 8 to 13 ft, subsiding to 7 to 10 ft after midnight. .SAT...SE winds 10 to 15 kt. Seas 5 to 7 ft. .SAT NIGHT...SE winds 10 to 15 kt. Seas 3 to 5 ft. .SUN...SE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 3 to 4 ft. .SUN NIGHT...E winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 3 ft. .MON...E winds 10 to 15 kt. Seas 3 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. SW Gulf of Mexico S of 22N W of 87W .TODAY...NW winds 15 to 25 kt. Seas 3 ft, building to 5 to 7 ft in the afternoon. .TONIGHT...N winds 15 to 25 kt within 60 nm of coast of Veracruz, and NW 20 to 30 kt elsewhere. Within 60 nm of coast of Veracruz, seas 6 to 9 ft. Elsewhere, seas 7 to 10 ft, building to 8 to 13 ft after midnight. .FRI...NW winds 10 to 20 kt. Seas 7 to 10 ft within 60 nm of coast of Veracruz, and 8 to 13 ft elsewhere. .FRI NIGHT...Within 60 nm of coast of Veracruz, NE winds less than 10 kt, shifting to SE after midnight. Elsewhere, N winds less than 10 kt in the evening, becoming variable winds less than 10 kt. Seas 7 to 10 ft. .SAT...SE winds less than 10 kt, shifting to E in the afternoon. Seas 5 to 7 ft. .SAT NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .SUN...E winds 10 to 15 kt. Seas 3 to 4 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .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. Gulf of Mexico E of 87W ...GALE WARNING... .TODAY...SW winds 20 to 30 kt. Seas 8 to 11 ft. .TONIGHT...W winds 25 to 35 kt. Seas 9 to 14 ft, building to 13 to 18 ft after midnight. .FRI...W winds 25 to 35 kt. Seas 17 to 22 ft. .FRI NIGHT...NW winds 20 to 30 kt, diminishing to 10 to 20 kt after midnight. Seas 14 to 19 ft, subsiding to 11 to 16 ft after midnight. .SAT...NW winds 10 to 15 kt, shifting to N in the afternoon. Seas 7 to 10 ft. .SAT NIGHT...E winds less than 10 kt. Seas 4 to 6 ft. .SUN...E winds 10 kt. Seas 3 to 4 ft. .SUN NIGHT...E winds 10 to 15 kt. Seas 3 ft. .MON...E winds 10 to 15 kt. Seas 3 ft. .MON NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft.