344 
FZNT02 KNHC 110406
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL 
0430 UTC TUE SEP 11 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 TUE SEP 11.
24 HOUR FORECAST VALID 0000 UTC WED SEP 12.
48 HOUR FORECAST VALID 0000 UTC THU SEP 13.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 25.9N 62.4W 944 MB AT 0300 UTC SEP 11 
MOVING WNW OR 290 DEG AT 11 KT. MAXIMUM SUSTAINED WINDS 120 KT 
GUSTS 145 KT. TROPICAL STORM FORCE WINDS WITHIN 130 NM E 
SEMICIRCLE...80 NM SW QUADRANT AND 110 NM NW QUADRANT. SEAS 12 
FT OR GREATER WITHIN 240 NM NE QUADRANT...150 NM SE 
QUADRANT...90 NM SW QUADRANT...AND 180 NM NW QUADRANT WITH SEAS 
TO 40 FT. ELSEWHERE WITHIN 240 NM NW AND 120 NM SE SEMICIRCLES 
WINDS 20 TO 33 KT. SEAS 11 TO 18 FT. REMAINDER OF AREA N OF 22N 
BETWEEN 56W AND 66W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.24 HOUR FORECAST HURRICANE FLORENCE NEAR 27.9N 67.5W. MAXIMUM 
SUSTAINED WINDS 130 KT GUSTS 160 KT. TROPICAL STORM FORCE WINDS 
WITHIN 140 NM NE QUADRANT...130 NM SE QUADRANT...80 NM SW 
QUADRANT...AND 110 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
330 NM WITH SEAS TO 45 FT. ELSEWHERE WITHIN 240 NM NW AND 150 NM 
SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 13 TO 23 FT. REMAINDER OF 
AREA N OF 22N BETWEEN 59W AND 75W WINDS 20 KT OR LESS. SEAS TO 
11 FT IN MIXED SWELL E OF BAHAMAS.
.48 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 31.3N 73.2W. 
MAXIMUM SUSTAINED WINDS 130 KT GUSTS 160 KT. TROPICAL STORM 
FORCE WINDS OVER FORECAST WATERS WITHIN 150 NM NE QUADRANT...140 
NM SE QUADRANT...90 NM SW QUADRANT...AND 120 NM NW QUADRANT. 
SEAS 12 FT OR GREATER WITHIN 420 NM NE AND 240 NM SW SEMICIRCLES 
WITH SEAS TO 48 FT. ELSEWHERE WITHIN 300 NM NE AND 180 NM SW 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 14 TO 24 FT. REMAINDER OF 
AREA N OF 25N W OF 63W WINDS 20 KT OR LESS. SEAS TO 11 FT IN 
MIXED SWELL E OF BAHAMAS.
.72 HOUR FORECAST HURRICANE FLORENCE NEAR 34.0N 76.5W. MAXIMUM 
SUSTAINED WINDS 120 KT GUSTS 145 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM FLORENCE NEAR 34.0N 76.5W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE INLAND NEAR 
36.5N 79.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.

...HURRICANE WARNING...
.TROPICAL STORM ISAAC NEAR 14.5N 46.9W 997 MB AT 0300 UTC SEP 11 
MOVING W OR 270 DEG AT 14 KT. MAXIMUM SUSTAINED WINDS 60 KT 
GUSTS 75 KT. TROPICAL STORM FORCE WINDS WITHIN 40 NM N 
SEMICIRCLE AND 10 NM S SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN 
90 NM N SEMICIRCLE AND 60 NM S SEMICIRCLE WITH SEAS TO 21 FT. 
ELSEWHERE WITHIN 270 NM NE AND 120 NM SW SEMICIRCLES WINDS 20 TO 
33 KT. SEAS 9 TO 16 FT. REMAINDER OF AREA FROM 12N TO 23N 
BETWEEN 40W AND 49W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.24 HOUR FORECAST HURRICANE ISAAC NEAR 14.6N 51.7W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS 
WITHIN 50 NM N SEMICIRCLE AND 30 NM S SEMICIRCLE. SEAS 12 FT OR 
GREATER WITHIN 180 NM N AND 75 NM S SEMICIRCLES WITH SEAS TO 29 
FT. ELSEWHERE WITHIN 270 NM N AND 120 NM S SEMICIRCLES WINDS 20 
TO 33 KT. SEAS 8 TO 14 FT. REMAINDER OF AREA FROM 11N TO 24N 
BETWEEN 45W AND 55W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED 
SWELL.
.48 HOUR FORECAST HURRICANE ISAAC NEAR 15.0N 56.9W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS 
WITHIN 80 NM NE QUADRANT...50 NM SE QUADRANT...40 NM SW 
QUADRANT...AND 70 NM NW QUADRANT. SEAS 12 FT OR GREATER AND 
WINDS 20 TO 33 KT WITHIN 240 NM NW AND 180 NM SE SEMICIRCLES. 
REMAINDER OF AREA FROM 11N TO 25N BETWEEN 52W AND 62W WINDS 20 
KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.4N 62.4W. MAXIMUM 
SUSTAINED WINDS 60 KT GUSTS 75 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.4N 62.4W. MAXIMUM 
SUSTAINED WINDS 55 KT GUSTS 65 KT.
.120 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 72.5W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.

...HURRICANE WARNING...
.HURRICANE HELENE EAST OF AREA NEAR 15.5N 32.4W 968 MB AT 0300 
UTC SEP 11 MOVING WNW OR 295 DEG AT 10 KT. MAXIMUM SUSTAINED 
WINDS 95 KT GUSTS 115 KT. TROPICAL STORM FORCE WINDS EAST OF 
AREA. SEAS 12 FT OR GREATER OVER FORECAST WATERS WITHIN 210 NM N 
SEMICIRCLE...150 NM SE QUADRANT AND 180 NM SW QUADRANT WITH SEAS 
TO 37 FT. E OF LINE FROM 13N35W TO 20N39W TO 22N37W WINDS 20 TO 
30 KT. SEAS 9 TO 13 FT. ELSEWHERE E OF LINE FROM 11N35W TO 
18N40W TO 18N23W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED 
SWELL.
.24 HOUR FORECAST HURRICANE HELENE NEAR 17.2N 35.7W. MAXIMUM 
SUSTAINED WINDS 85 KT GUSTS 105 KT. TROPICAL STORM FORCE WINDS 
WITHIN 120 NM NE QUADRANT...80 NM SE QUADRANT...60 NM SW 
QUADRANT...AND 100 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
330 NM NW AND 120 NM SE SEMICIRCLES WITH SEAS TO 38 FT. 
ELSEWHERE WITHIN 300 NM N AND 180 NM S SEMICIRCLES WINDS 20 TO 
33 KT. SEAS 12 TO 18 FT. REMAINDER OF AREA FROM 10N TO 25N E OF 
45W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE HELENE NEAR 20.1N 38.0W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS 
WITHIN 120 NM NE QUADRANT...100 NM SE QUADRANT...70 NM SW 
QUADRANT...AND 80 NM NW QUADRANT. SEAS 12 FT OR GREATER AND 
WINDS 20 TO 33 KT WITHIN 210 NM. REMAINDER OF AREA FROM 10N TO 
27N E OF 52W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 24.6N 39.0W.
MAXIMUM SUSTAINED WINDS 60 KT GUSTS 75 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM HELENE NEAR 24.6N 39.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 36.2N 34.0W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT.

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.
 
.CARIBBEAN AND GULF OF MEXICO FROM 19.5N TO 23N BETWEEN 83W AND 
89W...INCLUDING THE YUCATAN CHANNEL...E TO SE WINDS 20 TO 25 
KT...EXCEPT N TO NE WINDS ALONG NW YUCATAN. SEAS TO 8 FT. 
.24 HOUR GULF OF MEXICO FORECAST FROM 22N TO 25N BETWEEN 86W AND 
89W E TO SE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.30 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.ATLC 36 HOUR FORECAST N OF 30N BETWEEN 42W AND 50W WINDS 20 KT 
OR LESS. SEAS 8 FT IN N TO NE SWELL.
.48 HOUR FORECAST N OF LINE FROM 31N38W TO 27N43W TO 31N55W 
WINDS 20 KT OR LESS. SEAS 8 TO 11 FT IN N TO NE SWELL.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

$$
.FORECASTER MCELROY. NATIONAL HURRICANE CENTER.