246 FZNT02 KNHC 120343 RRA HSFAT2 HIGH SEAS FORECAST NWS NATIONAL HURRICANE CENTER MIAMI FL 0430 UTC WED SEP 12 2018 SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS SEAS GIVEN AS SIGNIFICANT WAVE HEIGHT...WHICH IS THE AVERAGE HEIGHT OF THE HIGHEST 1/3 OF THE WAVES.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. PAN PAN ATLANTIC FROM 07N TO 31N W OF 35W INCLUDING CARIBBEAN SEA AND GULF OF MEXICO SYNOPSIS VALID 0000 UTC WED SEP 12. 24 HOUR FORECAST VALID 0000 UTC THU SEP 13. 48 HOUR FORECAST VALID 0000 UTC FRI SEP 14. .WARNINGS. ...HURRICANE WARNING... .HURRICANE FLORENCE NEAR 28.4N 68.7W 946 MB AT 0300 UTC SEP 12 MOVING WNW OR 300 DEG AT 15 KT. MAXIMUM SUSTAINED WINDS 120 KT GUSTS 145 KT. TROPICAL STORM FORCE WINDS WITHIN 130 NM NW AND SE QUADRANTS...150 NM NE QUADRANT AND 100 NM SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 180 NM S SEMICIRCLE...270 NM NE QUADRANT AND 210 NM NW QUADRANT WITH SEAS TO 42 FT. ELSEWHERE WITHIN 270 NM NE AND 120 NM SW SEMICIRCLES WINDS 20 TO 33 KT. SEAS 9 TO 12 FT. REMAINDER OF AREA N OF 22N BETWEEN 60W AND 73W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL. .24 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 31.4N 73.4W. MAXIMUM SUSTAINED WINDS 135 KT GUSTS 165 KT. TROPICAL STORM FORCE WINDS WITHIN 140 NM NW AND SE QUADRANTS...160 NM NE QUADRANT AND 100 NM SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 300 NM N AND 270 NM S SEMICIRCLES WITH SEAS TO 45 FT. ELSEWHERE WITHIN 300 NM NE AND 150 NM SW SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 12 FT. REMAINDER OF AREA N OF 25N W OF 65W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL OUTSIDE BAHAMAS. .48 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 33.8N 76.8W. MAXIMUM SUSTAINED WINDS 115 KT GUSTS 140 KT. LITTLE CHANGE IN RADIUS OF TROPICAL STORM FORCE WINDS AND SEAS 12 FT OR GREATER. .72 HOUR FORECAST HURRICANE FLORENCE INLAND NEAR 34.3N 78.2W. MAXIMUM SUSTAINED WINDS 95 KT GUSTS 115 KT. EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE. .96 HOUR FORECAST TROPICAL STORM FLORENCE NEAR 34.3N 78.2W. MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT. .120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE INLAND NEAR 34.9N 82.5W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT. ...HURRICANE WARNING... .HURRICANE HELENE NEAR 18.0N 35.4W 973 MB AT 0300 UTC SEP 12 MOVING NW OR 325 DEG AT 9 KT. MAXIMUM SUSTAINED WINDS 85 KT GUSTS 105 KT. TROPICAL STORM FORCE WINDS WITHIN 140 NM NE...110 NM SE...80 NM SW AND 120 NM NW QUADRANTS. SEAS 12 FT OR GREATER WITHIN 240 NM E AND 300 NM W SEMICIRCLES WITH SEAS TO 35 FT. ELSEWHERE OVER FORECAST WATERS WITHIN 420 NM N AND 180 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 12 FT. REMAINDER OF AREA FROM 10N TO 25N E OF 44W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL. .24 HOUR FORECAST HURRICANE HELENE NEAR 21.2N 37.3W. MAXIMUM SUSTAINED WINDS 65 KT GUSTS 80 KT. LITTLE CHANGE IN RADIUS OF TROPICAL STORM FORCE WINDS AND SEAS 12 FT OR GREATER...WITH SEAS TO 32 FT. ELSEWHERE WITHIN 270 NM N AND 150 NM SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 12 FT. REMAINDER AREA FROM 10N TO 27N E OF 50W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL. .48 HOUR FORECAST TROPICAL STORM HELENE NEAR 26.6N 37.7W. MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS WITHIN 130 NM NE...120 NM SE...70 NM SW AND 90 NM NW QUADRANTS. SEAS 12 FT OR GREATER WITHIN 300 NM W AND 180 NM E SEMICIRCLES WITH SEAS TO 28 FT. ELSEWHERE WITHIN 270 NM NE AND 150 NM SW SEMICIRCLES WINDS 20 TO 33 KT. SEAS 9 TO 12 FT. REMAINDER OF AREA N OF 19N E OF 54W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL. .72 HOUR FORECAST TROPICAL STORM HELENE NEAR 33.7N 35.9W. MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE. .96 HOUR FORECAST TROPICAL STORM HELENE NEAR 33.7N 35.9W. MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. .120 HOUR FORECAST TROPICAL STORM HELENE NEAR 45.0N 23.0W. MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. ...TROPICAL STORM WARNING... .TROPICAL STORM ISAAC NEAR 14.5N 52.3W 999 MB AT 0300 UTC SEP 12 MOVING W OR 270 DEG AT 14 KT. MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM N AND 20 NM S SEMICIRCLES. SEAS 12 FT OR GREATER WITHIN 180 NM N AND 90 NM S SEMICIRCLE WITH SEAS TO 22 FT. ELSEWHERE WITHIN 300 NM N AND 90 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 11N TO 22N BETWEEN 47W AND 56W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL. .24 HOUR FORECAST TROPICAL STORM ISAAC NEAR 14.7N 57.4W. MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM NE...30 NM SE...0 NM SW AND 60 NM NW QUADRANTS. SEAS 12 FT OR GREATER WITHIN 180 NM N AND 60 NM S SEMICIRCLES WITH SEAS TO 20 FT. ELSEWHERE WITHIN 240 NM NW AND 75 NM SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 11N TO 23N BETWEEN 52W AND 62W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL. .48 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.1N 63.7W. MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE WINDS WITHIN 70 NM NE...30 NM SE...0 NM SW AND 50 NM NW QUADRANTS. SEAS 12 FT OR GREATER WITHIN 150 NM N AND 45 NM S SEMICIRCLES WITH SEAS TO 17 FT. ELSEWHERE WITHIN 210 NM NW AND 60 NM SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 13N TO 24N BETWEEN 56W AND 67W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL. .72 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.2N 69.7W. MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE. .96 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.2N 69.7W. MAXIMUM SUSTAINED WINDS 35 KT GUSTS 45 KT. .120 HOUR FORECAST...DISSIPATED. FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE AND INTENSITY. .SYNOPSIS AND FORECAST. .GULF OF MEXICO TROUGH FROM 20N89W TO 26N88W. FROM 21N TO 26N E OF TROUGH TO 85W...INCLUDING YUCATAN CHANNEL...E TO SE WINDS 20 TO 25 KT. SEAS TO 8 FT. .24 HOUR FORECAST DEVELOPING LOW PRESSURE NEAR 23N92W 1011 MB. FROM 90 NM TO 270 NM NE QUADRANT E TO SE WINDS 20 TO 25 KT. SEAS TO 8 FT. .48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 26N95W 1010 MB. FROM 75 NM TO 210 NM N SEMICIRCLE E TO SE WINDS 20 TO 25 KT. SEAS TO 8 FT. .ATLC 24 HOUR FORECAST N OF 29N BETWEEN 40W AND 52W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN N TO NE SWELL. .48 HOUR FORECAST CONDITIONS MERGED WITH MIXED SWELL FROM HELENE. .REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT. $$ .FORECASTER MUNDELL. NATIONAL HURRICANE CENTER.