000 FZNT31 KNHC 220915 OFFN20 MARINE WEATHER HF VOICE BROADCAST NWS NATIONAL HURRICANE CENTER MIAMI FL 515 AM EDT WED AUG 22 2012 MARINE WEATHER HF VOICE BROADCAST FOR THE TROPICAL N ATLANTIC FROM 07N TO 22N BETWEEN 55W AND 64W...THE SW N ATLC 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 15.5N 57.3W AT 5 AM EDT MOVING W AT 16 KT. MAXIMUM SUSTAINED WINDS ARE 40 KT GUSTS 50 KT. ISAAC WILL MOVE TO 15.9N 59.7W THIS AFTERNOON...TO 16.3N 62.8W TONIGHT...THEN WILL STRENGTHEN TO A HURRICANE NEAR 16.8N 65.7W THU AFTERNOON...MOVING TO 17.3N 68.4W THU NIGHT...TO 18.8N 73.2W FRI NIGHT...21.8N 77.1W SAT NIGHT AND 24.8N 80.0W SUN NIGHT. OTHERWISE A TROPICAL WAVE ALONG 67W WILL MOVE ACROSS THE CARIBBEAN THROUGH SAT. A 1009 MB LOW PRES NEAR 11.5N 34.5W MAY IMPACT THE FAR NORTHERN TROPICAL N ATLC SAT AND SUN...POSSIBLY AS A TROPICAL CYCLONE. NW CARIBBEAN W OF 85W .TODAY...E TO SE WINDS 15 TO 25 KT...DIMINISHING TO 10 TO 20 KT IN THE AFTERNOON. SEAS 6 TO 9 FT. .TONIGHT...E WINDS 15 TO 25 KT. SEAS 5 TO 7 FT. .THU THROUGH SAT NIGHT...NE WINDS 10 TO 20 KT. SEAS 3 TO 5 FT. .SUN...NE WINDS LESS THAN 10 KT...BECOMING N IN THE AFTERNOON. SEAS 2 TO 4 FT. CARIBBEAN N OF 15N BETWEEN 72W AND 85W .TODAY...E WINDS 10 TO 20 KT. SEAS 6 TO 9 FT. .TONIGHT...NE TO E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT. .THU THROUGH FRI...TROPICAL STORM CONDITIONS POSSIBLE. N TO NE WINDS 25 TO 35 KT. SEAS 5 TO 7 FT. .FRI NIGHT THROUGH SUN...HURRICANE CONDITIONS POSSIBLE. CARIBBEAN FROM 11N TO 15N W OF 70W .TODAY...E WINDS 15 TO 25 KT...DIMINISHING TO 10 TO 20 KT IN THE AFTERNOON. SEAS 6 TO 9 FT. .TONIGHT...NE TO E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT. .THU AND THU NIGHT...NE WINDS 10 TO 15 KT. SEAS 5 TO 7 FT. .FRI...NE WINDS LESS THAN 10 KT...BECOMING N IN THE AFTERNOON. SEAS 4 TO 6 FT. .FRI NIGHT THROUGH SUN...SW WINDS 10 TO 20 KT. SEAS 4 TO 6 FT. SW CARIBBEAN S OF 11N .TODAY...N TO NE WINDS 10 TO 15 KT...BECOMING NW IN THE AFTERNOON. SEAS 5 TO 7 FT. .TONIGHT...N TO NE WINDS 10 TO 15 KT. SEAS 4 TO 6 FT. .THU AND THU NIGHT...N TO NW WINDS 10 TO 15 KT. SEAS 4 TO 6 FT. .FRI AND FRI NIGHT...W TO NW WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .SAT THROUGH SUN...SW TO W WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. CARIBBEAN BETWEEN 64W AND 72W ...TROPICAL STORM WARNING... .TODAY...NE TO E WINDS 10 TO 20 KT. SEAS 5 TO 7 FT. .TONIGHT...TROPICAL STORM CONDITIONS POSSIBLE. NE WINDS 10 TO 20 KT...BECOMING N TO NE 20 TO 30 KT AFTER MIDNIGHT. SEAS 5 TO 7 FT. .THU...TROPICAL STORM CONDITIONS EXPECTED. N WINDS 50 TO 60 KT... BECOMING NW 40 TO 50 KT IN THE AFTERNOON. SEAS 6 TO 9 FT. .THU NIGHT AND FRI...TROPICAL STORM CONDITIONS EXPECTED. S WINDS 40 TO 50 KT. SEAS 8 TO 13 FT. .FRI NIGHT THROUGH SUN...TROPICAL STORM CONDITIONS POSSIBLE. OFFSHORE LEEWARD ISLANDS AND ADJACENT ATLC WATERS FROM 15N TO 19N W OF 55W ...TROPICAL STORM WARNING... .TODAY...TROPICAL STORM CONDITIONS EXPECTED. NE WINDS 30 TO 40 KT...BECOMING E 35 TO 45 KT IN THE AFTERNOON. SEAS 12 TO 17 FT. .TONIGHT...TROPICAL STORM CONDITIONS EXPECTED. E TO SE WINDS 40 TO 50 KT...BECOMING SE 45 TO 55 KT AFTER MIDNIGHT. SEAS 14 TO 19 FT. .THU...TROPICAL STORM CONDITIONS EXPECTED. SE WINDS 50 TO 60 KT...DIMINISHING TO 20 TO 30 KT IN THE AFTERNOON. SEAS 16 TO 21 FT. .THU NIGHT...E TO SE WINDS 20 TO 30 KT. SEAS 15 FT...SUBSIDING TO 12 FT AFTER MIDNIGHT. .FRI THROUGH SAT NIGHT...E WINDS 20 TO 30 KT. SEAS 7 TO 10 FT. .SUN...SE WINDS 20 TO 30 KT...BECOMING SE TO S 10 TO 20 KT IN THE AFTERNOON. SEAS 6 TO 9 FT. OFFSHORE WINDWARD ISLANDS AND ADJACENT ATLC WATERS FROM 07N TO 15N W OF 55W .TODAY...N WINDS 15 TO 25 KT...BECOMING S TO SW 20 TO 30 KT IN THE AFTERNOON. SEAS 7 TO 10 FT. .TONIGHT...S WINDS 20 TO 30 KT...BECOMING SE TO S 15 TO 25 KT AFTER MIDNIGHT. SEAS 6 TO 9 FT. .THU THROUGH SUN...SE WINDS 20 TO 30 KT. SEAS 6 TO 8 FT. SYNOPSIS FOR THE SW N ATLC INCLUDING THE BAHAMAS .SYNOPSIS...TROPICAL STORM ISAAC NEAR 15.5N 57.3W AT 5 AM EDT MOVING W AT 16 KT. MAXIMUM SUSTAINED WINDS ARE 40 KT GUSTS 50 KT. ISAAC WILL MOVE TO 15.9N 59.7W THIS AFTERNOON...TO 16.3N 62.8W TONIGHT...THEN WILL STRENGTHEN TO A HURRICANE NEAR 16.8N 65.7W THU AFTERNOON...MOVING TO 17.3N 68.4W THU NIGHT...TO 18.8N 73.2W FRI NIGHT...21.8N 77.1W SAT NIGHT AND 24.8N 80.0W SUN NIGHT. OTHERWISE A RIDGE OF HIGH PRES ALONG 28N WILL SLOWLY LIFT N THROUGH THE WEEKEND AS ISAAC APPROACHES FROM THE SE. ATLC WATERS FROM 27N TO 31N W OF 77W .TODAY...SW WINDS 10 TO 15 KT. SEAS 2 TO 4 FT. .TONIGHT...S TO SW WINDS 10 TO 15 KT. SEAS 2 TO 4 FT. .THU AND THU NIGHT...SE TO S WINDS 10 TO 15 KT. SEAS 2 TO 4 FT. .FRI THROUGH SUN...NE TO E WINDS 15 TO 25 KT. SEAS 6 TO 8 FT. ATLC WATERS FROM 27N TO 31N BETWEEN 65W AND 77W .TODAY...SE TO S WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .TONIGHT...SE WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .THU THROUGH SUN...E WINDS 15 TO 25 KT. SEAS 6 TO 9 FT. BAHAMAS N OF 22N .TODAY...E TO SE WINDS 10 TO 15 KT. SEAS 3 TO 5 FT. .TONIGHT...E WINDS 10 TO 15 KT...BECOMING 10 TO 20 KT AFTER MIDNIGHT. SEAS 3 TO 5 FT. .THU THROUGH FRI...NE TO E WINDS 15 TO 25 KT. SEAS 6 TO 8 FT. .FRI NIGHT THROUGH SUN...HURRICANE CONDITIONS POSSIBLE. ATLC WATERS FROM 22N TO 27N BETWEEN 65W AND THE BAHAMAS .TODAY...E TO SE WINDS 10 TO 15 KT...BECOMING E 10 TO 20 KT IN THE AFTERNOON. SEAS 5 TO 7 FT. .TONIGHT...NE TO E WINDS 10 TO 20 KT. SEAS 6 TO 8 FT. .THU THROUGH SUN...E TO SE WINDS 20 TO 30 KT. SEAS 9 TO 14 FT. ATLC WATERS S OF 22N W OF 65W .TODAY...E WINDS 15 TO 25 KT...BECOMING NE TO E 10 TO 20 KT IN THE AFTERNOON. SEAS 6 TO 9 FT. .TONIGHT...NE TO E WINDS 10 TO 20 KT...INCREASING TO 15 TO 25 KT AFTER MIDNIGHT. SEAS 8 TO 11 FT. .THU...TROPICAL STORM CONDITIONS POSSIBLE. NE TO E WINDS 15 TO 25 KT...INCREASING TO 20 TO 30 KT IN THE AFTERNOON. SEAS 11 TO 16 FT. .THU NIGHT THROUGH FRI NIGHT...TROPICAL STORM CONDITIONS POSSIBLE. E TO SE WINDS 40 TO 50 KT. SEAS 16 TO 21 FT. .SAT AND SAT NIGHT...HURRICANE CONDITIONS POSSIBLE. .SUN...TROPICAL STORM CONDITIONS POSSIBLE. ATLC WATERS FROM 19N TO 22N BETWEEN 55W AND 65W .TODAY...NE TO E WINDS 15 TO 25 KT...BECOMING E 20 TO 25 KT IN THE AFTERNOON. SEAS 10 TO 15 FT. .TONIGHT...E WINDS 20 TO 30 KT. SEAS 12 TO 17 FT. .THU AND THU NIGHT...E TO SE WINDS 20 TO 30 KT. SEAS 15 TO 20 FT. .FRI THROUGH SUN...E WINDS 20 TO 30 KT. SEAS 8 TO 13 FT.