680 FZNT31 KNHC 090328 OFFN20 Marine Weather HF Voice Broadcast NWS National Hurricane Center Miami, FL 1128 PM EDT Sat Sep 8 2018 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...Tropical Storm Isaac near 14.4N 37.5W 1002 mb at 11 PM EDT moving W at 7 kt. Maximum sustained winds 45 kt gusts 55 kt. Isaac will move to 14.5N 40.9W Sun evening and strengthen to a hurricane near 14.5N 43.5W Mon morning. Isaac will continue W to 14.5N 46.1W Mon evening, and 14.5N 51.5W Tue evening. Isaac will change little in intensity as it approaches the Lesser Antilles near 14.6N 57.0W Wed evening, and continue into the eastern Caribbean near 15.0N 62.9W Thu. Otherwise, relatively weak ridging over the western Atlantic will maintain moderate to fresh trade winds over most of the region through Mon night. Building high pressure over the eastern Gulf of Mexico will allow fresh to locally strong E to SE winds and building seas over portions of the NW Caribbean Sun through Tue. NW Caribbean W of 85W .OVERNIGHT...SE winds 10 to 20 kt. Seas 3 to 4 ft. .SUN...SE winds 10 to 15 kt. Seas 3 to 5 ft. .SUN NIGHT...SE winds 10 to 20 kt. Seas 3 to 5 ft. .MON...E winds 10 to 20 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...SE winds 10 to 20 kt. Seas 3 to 5 ft. .TUE NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .WED...E winds 10 to 20 kt. Seas 3 to 4 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .THU...E winds 10 to 15 kt. Seas 3 to 5 ft. Caribbean N of 15N between 72W and 85W .OVERNIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft S of 18N, and 2 ft or less elsewhere. .SUN...E winds 10 to 15 kt. Seas 3 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 3 ft. .MON...E winds 10 to 20 kt. Seas 3 to 4 ft. .MON NIGHT...E winds 10 to 20 kt. Seas 3 to 4 ft. .TUE...E winds 10 to 20 kt. Seas 3 to 4 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .WED...E winds 10 to 15 kt. Seas 3 to 4 ft. .WED NIGHT...E winds 10 to 15 kt S of 18N, and E less than 10 kt elsewhere. Seas 3 ft. .THU...E winds 10 to 20 kt. Seas 3 ft. Caribbean from 11N to 15N W of 72W .OVERNIGHT...E winds 10 to 15 kt. Seas 3 to 4 ft. .SUN...E winds 10 to 15 kt. Seas 3 to 5 ft. .SUN NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .MON...E winds 10 to 20 kt. Seas 3 to 5 ft. .MON NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .TUE...E winds 10 to 20 kt. Seas 3 to 5 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .WED...E winds 10 to 15 kt. Seas 3 to 5 ft. .WED NIGHT...E winds 10 to 20 kt. Seas 3 to 5 ft. .THU...E winds 10 to 20 kt. Seas 3 to 5 ft. SW Caribbean S of 11N .OVERNIGHT...Variable winds less than 10 kt. Seas 3 ft. .SUN...Variable winds less than 10 kt. Seas 3 ft. .SUN NIGHT...NE winds less than 10 kt. Seas 2 ft or less. .MON...NE winds less than 10 kt. Seas 3 ft. .MON NIGHT...NE winds less than 10 kt, shifting to N after midnight. Seas 3 ft. .TUE...N winds 10 to 15 kt. Seas 3 ft. .TUE NIGHT...N winds less than 10 kt. Seas 3 ft. .WED...NE winds 10 to 15 kt. Seas 3 ft. .WED NIGHT...E winds less than 10 kt. Seas 3 ft. .THU...SE winds less than 10 kt. Seas 3 ft. Caribbean between 64W and 72W ...TROPICAL STORM CONDITIONS POSSIBLE WED NIGHT... ...HURRICANE CONDITIONS POSSIBLE THU... .OVERNIGHT...E winds 10 to 20 kt. Seas 2 ft or less Gulf of Venezuela, and 3 to 5 ft elsewhere. .SUN...E winds 10 to 15 kt. Seas 2 ft or less Gulf of Venezuela, and 3 to 5 ft elsewhere. .SUN 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. .MON...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. .MON 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. .TUE...E winds 10 to 15 kt. Seas 3 to 5 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 15 kt. Seas 3 to 5 ft. .WED NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. Offshore Leeward Islands and adjacent ATLC waters from 15N to 19N W of 55W ...HURRICANE CONDITIONS POSSIBLE TUE NIGHT THROUGH THU... .OVERNIGHT...NE winds less than 10 kt. Seas 4 to 6 ft. .SUN...E winds less than 10 kt. Seas 4 to 6 ft. .SUN NIGHT...E winds less than 10 kt. Seas 4 to 6 ft. .MON...E winds less than 10 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...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. Offshore Windward Islands and adjacent ATLC waters from 07N to 15N W of 55W ...HURRICANE CONDITIONS POSSIBLE TUE NIGHT THROUGH THU... .OVERNIGHT...E winds less than 10 kt. Seas 3 to 5 ft. .SUN...E winds less than 10 kt. Seas 3 to 5 ft. .SUN NIGHT...E winds less than 10 kt. Seas 3 to 5 ft. .MON...E winds less than 10 kt. Seas 3 to 5 ft. .MON NIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. .TUE...NE winds 10 to 15 kt. Seas 4 to 6 ft. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. Synopsis for the the SW N ATLC including the Bahamas .SYNOPSIS...Tropical Storm Florence near 24.6N 55.2W 989 mb at 11 PM EDT moving W at 5 kt. Maximum sustained winds 60 kt gusts 75 kt. Florence will strengthen to a hurricane near 24.5N 55.9W Sun morning, move to 24.8N 57.4W Sun afternoon, 25.2N 59.3W Mon morning, 25.8N 61.8W Mon afternoon, and 27.5N 67.5W Tue afternoon. Florence will change little in intensity as it moves over the north-central offshores near 30.0N 73.5W Wed afternoon, then continue to 33.8N 77.8W Thu afternoon. Otherwise, a weak pressure pattern across the SW N Atlc will maintain gentle to moderate mainly easterly winds across the area through Mon. ATLC waters from 27N to 31N W of 77W ...TROPICAL STORM CONDITIONS POSSIBLE WED... ...HURRICANE CONDITIONS POSSIBLE WED NIGHT AND THU... .OVERNIGHT...SE winds 10 kt. Seas 5 ft. .SUN...S winds 10 kt. Seas 5 ft. .SUN NIGHT...S winds 10 kt. Seas 5 ft. .MON...S winds 10 kt. Seas 5 ft. .MON NIGHT...SE winds less than 10 kt in the evening, becoming variable winds less than 10 kt. Seas 4 to 5 ft. .TUE...Variable winds less than 10 kt. Seas 5 to 6 ft. .TUE NIGHT...Variable winds less than 10 kt. Seas 6 to 8 ft. .WED...TROPICAL STORM CONDITIONS POSSIBLE. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. ATLC waters from 27N to 31N between 65W and 77W ...HURRICANE CONDITIONS POSSIBLE TUE THROUGH THU... .OVERNIGHT...Variable winds less than 10 kt, becoming SW less than 10 kt after midnight. Seas 5 to 6 ft. .SUN...SW winds less than 10 kt. Seas 5 to 6 ft. .SUN NIGHT...W of 70W, E winds less than 10 kt. Elsewhere, N winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 5 to 7 ft. .MON...NE winds 10 to 15 kt. Seas 6 to 8 ft. .MON NIGHT...HURRICANE CONDITIONS POSSIBLE. NE winds 10 to 15 kt W of 70W, and N 20 to 30 kt elsewhere. W of 70W, seas 5 to 7 ft. Elsewhere, seas 7 to 10 ft, building to 8 to 13 ft after midnight. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE. .WED NIGHT...HURRICANE CONDITIONS POSSIBLE. .THU...HURRICANE CONDITIONS POSSIBLE. Bahamas N of 22N .OVERNIGHT...SE winds 10 kt. Seas 3 ft. .SUN...SE winds 10 kt. Seas 3 ft. .SUN NIGHT...SE winds 10 to 15 kt. Seas 3 ft. .MON...E winds 10 to 15 kt. Seas 3 ft. .MON NIGHT...E winds 10 kt. Seas 3 ft. .TUE...NE winds less than 10 kt. Seas 3 to 4 ft. .TUE NIGHT...NE winds less than 10 kt. Seas 3 to 5 ft. .WED...E winds less than 10 kt. Seas 3 to 5 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 4 to 6 ft. .THU...SE winds 10 to 15 kt. Seas 3 to 5 ft. ATLC waters from 22N to 27N between 65W and the Bahamas ...HURRICANE CONDITIONS POSSIBLE MON NIGHT THROUGH WED... ...TROPICAL STORM CONDITIONS POSSIBLE WED NIGHT... .OVERNIGHT...E winds less than 10 kt. Seas 5 to 6 ft. .SUN...NE winds less than 10 kt. Seas 5 to 6 ft. .SUN NIGHT...NE winds less than 10 kt, increasing to 10 to 15 kt after midnight. Seas 5 to 7 ft. .MON...NE winds 10 to 15 kt. Seas 6 to 8 ft. .MON NIGHT...HURRICANE CONDITIONS POSSIBLE. NE winds 10 to 15 kt W of 70W, and NW 20 to 30 kt elsewhere. W of 70W, seas 5 to 7 ft. Elsewhere, seas 7 to 10 ft, building to 8 to 13 ft after midnight. .TUE...HURRICANE CONDITIONS POSSIBLE. .TUE NIGHT...HURRICANE CONDITIONS POSSIBLE. .WED...HURRICANE CONDITIONS POSSIBLE. .WED NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .THU...E winds 10 to 15 kt. Seas 7 to 9 ft. ATLC waters S of 22N W of 65W ...TROPICAL STORM CONDITIONS POSSIBLE THU... .OVERNIGHT...E winds 10 to 15 kt. Seas 3 to 5 ft. .SUN...E winds 10 kt. Seas 4 to 6 ft. .SUN NIGHT...NE winds 10 to 15 kt. Seas 4 to 6 ft. .MON...NE winds 10 to 15 kt, diminishing to less than 10 kt in the afternoon. Seas 4 to 6 ft. .MON NIGHT...NE winds less than 10 kt. Seas 5 to 7 ft. .TUE...SE winds less than 10 kt. Seas 5 to 7 ft. .TUE NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. .WED...E winds 10 to 15 kt. Seas 5 to 7 ft. .WED NIGHT...E winds 10 to 15 kt. Seas 5 to 7 ft. .THU...TROPICAL STORM CONDITIONS POSSIBLE. E winds 10 to 15 kt. Seas 5 to 7 ft. ATLC waters from 19N to 22N between 55W and 65W ...TROPICAL STORM CONDITIONS POSSIBLE WED NIGHT AND THU... .OVERNIGHT...N winds 10 to 15 kt. Seas 6 to 8 ft. .SUN...NW winds 10 to 20 kt. Seas 7 to 8 ft. .SUN NIGHT...NW winds 10 to 15 kt, diminishing to less than 10 kt after midnight. Seas 6 to 8 ft. .MON...S winds less than 10 kt. Seas 6 to 8 ft. .MON NIGHT...SE winds 10 to 15 kt. Seas 6 to 9 ft. .TUE...E winds 10 to 15 kt. Seas 6 to 9 ft. .TUE NIGHT...E winds 10 to 20 kt. Seas 6 to 9 ft. .WED...E winds 10 to 20 kt. Seas 7 to 10 ft. .WED NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. .THU...TROPICAL STORM CONDITIONS POSSIBLE.