938 
FZNT02 KNHC 112202
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL 
2230 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1800 UTC TUE SEP 11.
24 HOUR FORECAST VALID 1800 UTC WED SEP 12.
48 HOUR FORECAST VALID 1800 UTC THU SEP 13.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 27.6N 67.2W 945 MB AT 2100 UTC SEP 11 
MOVING WNW OR 300 DEG AT 16 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 210 NM NW AND SE QUADRANTS...300 NM NE 
QUADRANT AND 180 NM SW QUADRANT WITH SEAS TO 44 FT. ELSEWHERE 
WITHIN 270 NM NE AND 120 NM SW SEMICIRCLES WINDS 20 TO 33 KT. 
SEAS 9 TO 20 FT. REMAINDER OF AREA N OF 21.5N BETWEEN 59W AND 
70W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE FLORENCE NEAR 30.4N 72.1W. 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 330 NM NE...240 NM 
SE...270 NM SW...AND 300 NM NW QUADRANTS WITH SEAS TO 50 FT. 
ELSEWHERE WITHIN 300 NM NE AND 150 NM SW SEMICIRCLES WINDS 20 TO 
33 KT. SEAS 10 TO 21 FT. REMAINDER OF AREA N OF 24N BETWEEN 63W 
AND 80W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL E OF 
BAHAMAS.
.48 HOUR FORECAST HURRICANE FLORENCE NEAR 33.4N 76.2W. MAXIMUM 
SUSTAINED WINDS 120 KT GUSTS 145 KT. LITTLE CHANGE IN RADIUS OF 
TROPICAL STORM FORCE WINDS. SEAS 12 FT OR GREATER OVER FORECAST 
WATERS WITHIN 420 NM NE AND 270 NM SW SEMICIRCLES WITH SEAS TO 
48 FT. ELSEWHERE WITHIN 270 NM NE AND 150 NM SW SEMICIRCLES OF 
CENTER WINDS 20 TO 33 KT. SEAS 14 TO 22 FT. REMAINDER OF AREA N 
OF 28N W OF 69W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED 
SWELL E OF BAHAMAS.. 
.72 HOUR FORECAST HURRICANE FLORENCE INLAND NEAR 34.5N 77.7W.
MAXIMUM SUSTAINED WINDS 100 KT GUSTS 120 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM FLORENCE NEAR 34.5N 77.7W.
MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE NEAR 34.5N 
77.7W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.

...TROPICAL STORM WARNING...
.TROPICAL STORM ISAAC NEAR 14.6N 51.3W 996 MB AT 2100 UTC SEP 11 
MOVING W OR 270 DEG AT 15 KT. MAXIMUM SUSTAINED WINDS 60 KT 
GUSTS 75 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM N 
SEMICIRCLE AND 20 NM S SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN 
180 NM N SEMICIRCLE AND 60 NM S SEMICIRCLE WITH SEAS TO 24 FT. 
ELSEWHERE WITHIN 360 NM N AND 90 NM S SEMICIRCLES WINDS 20 TO 33 
KT. SEAS 9 TO 15 FT. REMAINDER OF AREA FROM 11N TO 22N BETWEEN 
46W AND 55W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST TROPICAL STORM ISAAC NEAR 14.8N 56.2W. MAXIMUM 
SUSTAINED WINDS 60 KT GUSTS 75 KT. TROPICAL STORM FORCE WINDS 
WITHIN 30 NM S SEMICIRCLE...90 NM NE QUADRANT AND 70 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 NM N AND 90 NM S 
SEMICIRCLES WITH SEAS TO 26 FT. ELSEWHERE WITHIN 270 NM NW AND 
120 NM SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 9 TO 16 FT. 
REMAINDER OF AREA FROM 11N TO 23N BETWEEN 50W AND 61W WINDS 20 
KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.48 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.3N 62.3W. MAXIMUM 
SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE WINDS 
WITHIN 80 NM NE QUADRANT...50 NM SE QUADRANT...30 NM SW 
QUADRANT...AND 60 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
180 NM N SEMICIRCLE AND 60 NM SE QUADRANT WITH SEAS TO 18 FT. 
ELSEWHERE WITHIN 240 NM NW AND 120 NM SE SEMICIRCLES WINDS 20 TO 
33 KT. SEAS 8 TO 12 FT. REMAINDER OF AREA FROM 13N TO 24N 
BETWEEN 54W AND 66W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.72 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 68.5W. MAXIMUM 
SUSTAINED WINDS 50 KT GUSTS 60 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 68.5W. MAXIMUM 
SUSTAINED WINDS 45 KT GUSTS 55 KT.
.120 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 68.5W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.

...HURRICANE WARNING...
.HURRICANE HELENE NEAR 17.2N 34.9W 968 MB AT 2100 UTC SEP 11 
MOVING NW OR 320 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 90 KT 
GUSTS 110 KT. TROPICAL STORM FORCE WINDS WITHIN 120 NM NE 
QUADRANT...100 NM SE QUADRANT...40 NM SW QUADRANT...AND 80 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 NM NE AND SW 
QUADRANTS...300 NM NW QUADRANT AND 180 NM SE QUADRANT WITH SEAS 
TO 36 FT. ELSEWHERE OVER FORECAST WATERS WITHIN 420 NM N AND 180 
NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 11 TO 19 FT. REMAINDER 
OF AREA FROM 10N TO 24N E OF 43W WINDS 20 KT OR LESS. SEAS TO 11 
FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE HELENE NEAR 20.2N 37.2W. MAXIMUM 
SUSTAINED WINDS 70 KT GUSTS 85 KT. TROPICAL STORM FORCE WINDS 
WITHIN 100 NM NW AND SE QUADRANTS...120 NM NE QUADRANT AND 60 NM 
SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 330 NM NW AND 120 NM 
SE SEMICIRCLES WITH SEAS TO 32 FT. ELSEWHERE WITHIN 270 NM N AND 
150 NM SE SEMICIRCLES WINDS 20 TO 33 KT. SEAS 12 TO 20 FT. 
REMAINDER OF 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 25.0N 38.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE 
WINDS WITHIN 120 NM NE QUADRANT...100 NM SE QUADRANT...60 NM SW 
QUADRANT...AND 80 NM NW QUADRANT. 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 10 TO 15 FT. EXCEPT AS NOTED BELOW...REMAINDER OF AREA N OF 
17N E OF 50W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 31.5N 37.0W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM HELENE NEAR 31.5N 37.0W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 31.5N 37.0W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 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.
 
.GULF OF MEXICO TROUGH FROM 20N88W TO 25N86W. GULF OF MEXICO AND 
CARIBBEAN WATERS...INCLUDING THE YUCATAN CHANNEL...FROM 20N TO 
25N BETWEEN 84W AND TROUGH E TO SE WINDS 20 TO 25 KT. SEAS TO 8 
FT. SCATTERED MODERATE TO STRONG CONVECTION FROM 17.5N TO 26N 
BETWEEN 81.5W AND 87.5W.
.24 HOUR FORECAST DEVELOPING LOW PRESSURE...POSSIBLE TROPICAL 
CYCLONE...NEAR 23.5N91.5W 1011 MB. FROM 90 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 
26N94.5W 1010 MB. FROM 75 TO 240 NM NE SEMICIRCLE E TO SE 
WINDS 20 TO 25 KT. SEAS TO 8 FT.

.ATLC 24 HOUR FORECAST N OF 29.5N BETWEEN 39W AND 52W WINDS 20 
KT OR LESS. SEAS 8 TO 9 FT IN N TO NE SWELL.
.48 HOUR FORECAST N OF 23N BETWEEN 46W AND 56W WINDS 20 KT OR 
LESS. SEAS 8 TO 11 FT IN MIXED NE AND SE SWELL.

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

$$
.FORECASTER STRIPLING. NATIONAL HURRICANE CENTER.