578 
FZNT02 KNHC 110956
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL 
1030 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0600 UTC TUE SEP 11.
24 HOUR FORECAST VALID 0600 UTC WED SEP 12.
48 HOUR FORECAST VALID 0600 UTC THU SEP 13.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 26.4N 64.1W 944 MB AT 0900 UTC SEP 11 
MOVING WNW OR 290 DEG AT 13 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...120 NM SW QUADRANT...AND 180 NM NW QUADRANT WITH SEAS 
TO 41 FT. ELSEWHERE WITHIN 270 NM NE AND 180 NM SW SEMICIRCLES 
WINDS 20 TO 33 KT. SEAS 11 TO 18 FT. REMAINDER OF AREA N OF 22N 
BETWEEN 57W AND 69W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.24 HOUR FORECAST HURRICANE FLORENCE NEAR 28.7N 69.4W. 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 60W AND 77W WINDS 20 KT OR LESS. SEAS TO 
11 FT IN MIXED SWELL E OF BAHAMAS.
.48 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 32.2N 74.5W. 
MAXIMUM SUSTAINED WINDS 125 KT GUSTS 150 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 OVER FORECAST WATERS 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 26N W OF 64W WINDS 20 KT OR LESS. 
SEAS TO 11 FT IN MIXED SWELL E OF BAHAMAS.
.72 HOUR FORECAST HURRICANE FLORENCE NEAR 34.3N 77.1W. MAXIMUM 
SUSTAINED WINDS 115 KT GUSTS 140 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM FLORENCE NEAR 34.3N 77.1W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE INLAND NEAR 
36.0N 79.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.

...HURRICANE WARNING...
.TROPICAL STORM ISAAC NEAR 14.6N 48.1W 997 MB AT 0900 UTC SEP 11 
MOVING W OR 270 DEG AT 12 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 
210 NM N AND 90 NM S SEMICIRCLES WITH SEAS TO 21 FT. ELSEWHERE 
WITHIN 300 NM N AND 120 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 
10 TO 16 FT. REMAINDER OF AREA FROM 12N TO 23N BETWEEN 41W AND 
51W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE ISAAC NEAR 14.6N 52.6W. 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 210 NM N AND 120 NM S SEMICIRCLES WITH SEAS TO 25 
FT. ELSEWHERE WITHIN 270 NM NW AND 150 NM SE SEMICIRCLES WINDS 
20 TO 33 KT. SEAS 10 TO 17 FT. REMAINDER OF AREA FROM 11N TO 24N 
BETWEEN 48W AND 57W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.48 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.1N 57.6W. MAXIMUM 
SUSTAINED WINDS 60 KT GUSTS 75 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 WITHIN 
180 NM N AND 75 NM S SEMICIRCLES WITH SEAS TO 29 FT. ELSEWHERE 
WITHIN 240 NM NW AND 150 NM SE SEMICIRCLES WINDS 20 TO 33 KT. 
SEAS 11 TO 18 FT. REMAINDER OF AREA FROM 11N TO 25N BETWEEN 53W 
AND 63W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 62.8W. MAXIMUM 
SUSTAINED WINDS 55 KT GUSTS 65 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 62.8W. MAXIMUM 
SUSTAINED WINDS 55 KT GUSTS 65 KT.
.120 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.8N 72.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.

...HURRICANE WARNING...
.HURRICANE HELENE E OF AREA NEAR 16.0N 33.6W 968 MB AT 0900 UTC 
SEP 11 MOVING WNW OR 300 DEG AT 12 KT. MAXIMUM SUSTAINED WINDS 
95 KT GUSTS 115 KT. TROPICAL STORM FORCE WINDS E OF AREA WITHIN 
100 NM NE QUADRANT...70 NM SE QUADRANT...40 NM SW QUADRANT...AND 
80 NM NW QUADRANT. SEAS 12 FT OR GREATER OVER FORECAST WATERS 
WITHIN 210 NM NE AND SW QUADRANTS...240 NM NW QUADRANT AND 180 
NM SE QUADRANT WITH SEAS TO 37 FT. E OF LINE FROM 12N37W TO 
21N40W TO 22N38W WINDS 20 TO 30 KT. SEAS 11 TO 19 FT. ELSEWHERE 
E OF LINE FROM 11N38W TO 18N41W TO 23N41W WINDS 20 KT OR LESS. 
SEAS TO 11 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE HELENE NEAR 18.0N 36.5W. 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 270 NM NW AND 180 NM SE SEMICIRCLES WINDS 20 TO 
33 KT. SEAS 12 TO 22 FT. REMAINDER OF AREA FROM 10N TO 26N E OF 
47W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE HELENE NEAR 21.4N 38.3W. 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 WITHIN 
300 NM W AND 180 NM E SEMICIRCLES WITH SEAS TO 32 FT. ELSEWHERE 
WITHIN 240 NM E AND 180 NM W SEMICIRCLES WINDS 20 TO 33 KT. SEAS 
9 TO 17 FT. REMAINDER OF AREA N OF LINE FROM 12N35W TO 07N47W TO 
07N53W AND S OF 27N WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED 
SWELL.
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 25.7N 38.8W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM HELENE NEAR 25.7N 38.8W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 37.3N 31.2W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 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 FROM 22N TO 24N BETWEEN 85W AND 88W E TO SE 
WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT. 
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.ATLC 30 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 27N37W TO 27N52W TO 31N58W 
WINDS 20 KT OR LESS. SEAS 8 TO 12 FT IN N TO NE SWELL.

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

$$
.FORECASTER MCELROY. NATIONAL HURRICANE CENTER.