916 
FZNT02 KNHC 102053
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL 
2230 UTC MON SEP 10 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 MON SEP 10.
24 HOUR FORECAST VALID 1800 UTC TUE SEP 11.
48 HOUR FORECAST VALID 1800 UTC WED SEP 12.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 25.4N 61.1W 939 MB AT 2100 UTC SEP 10 
MOVING WNW OR 285 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 210 NM NW QUADRANT WITH SEAS TO 40 FT. 
ELSEWHERE WITHIN 240 NM NE...180 NM SE...90 NM SW...AND 180 NM 
NW QUADRANTS WINDS 20 TO 33 KT. SEAS 9 TO 16 FT. REMAINDER OF 
AREA N OF 21.5N BETWEEN 55W AND 65W WINDS 20 KT OR LESS. SEAS TO 
10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE FLORENCE NEAR 27.0N 66.2W. MAXIMUM 
SUSTAINED WINDS 135 KT GUSTS 165 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 NE AND 180 NM SW SEMICIRCLES WITH SEAS TO 50 FT. 
ELSEWHERE WITHIN 270 NM NE AND 120 NM SW SEMICIRCLES WINDS 20 TO 
33 KT. SEAS 10 TO 18 FT. REMAINDER OF AREA N OF 21N BETWEEN 58W 
AND 71W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE FLORENCE NEAR 30.4N 72.2W. MAXIMUM 
SUSTAINED WINDS 130 KT GUSTS 160 KT. TROPICAL STORM FORCE WINDS 
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 N AND 210 NM S SEMICIRCLES WITH SEAS TO 48 FT. ELSEWHERE 
WITHIN 300 NM NE AND 120 NM SW SEMICIRCLES WINDS 20 TO 33 KT. 
SEAS 10 TO 18 FT. REMAINDER OF AREA N OF 23.5N BETWEEN 63W AND 
80W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL E OF 
BAHAMAS.
.72 HOUR FORECAST HURRICANE FLORENCE NEAR 33.7N 77.0W. 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 33.7N 77.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE NEAR 33.7N 
77.0W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.

...HURRICANE WARNING...
.HURRICANE ISAAC NEAR 14.4N 45.0W 993 MB AT 2100 UTC SEP 10 
MOVING W OR 270 DEG AT 12 KT. MAXIMUM SUSTAINED WINDS 65 KT 
GUSTS 80 KT. TROPICAL STORM FORCE WINDS WITHIN 40 NM N 
SEMICIRCLE AND 20 NM S SEMICIRCLE. SEAS 12 FT OR GREATER WITHIN 
60 NM S SEMICIRCLE...120 NM NE QUADRANT AND 90 NM NW QUADRANT 
WITH SEAS TO 26 FT. ELSEWHERE WITHIN 270 NM NE AND 120 NM SW 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF 
AREA FROM 13N TO 21N BETWEEN 39W AND 47W WINDS 20 KT OR LESS. 
SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE ISAAC NEAR 14.6N 49.8W. MAXIMUM 
SUSTAINED WINDS 75 KT GUSTS 90 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 90 NM S SEMICIRCLES WINDS 20 
TO 33 KT. SEAS 8 TO 14 FT. REMAINDER OF AREA FROM 11N TO 24N 
BETWEEN 44W AND 54W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.48 HOUR FORECAST HURRICANE ISAAC NEAR 14.8N 54.7W. MAXIMUM 
SUSTAINED WINDS 75 KT GUSTS 90 KT. TROPICAL STORM FORCE WINDS 
WITHIN 40 NM S SEMICIRCLE...80 NM NE QUADRANT AND 70 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 NM N AND 120 NM S 
SEMICIRCLES OF CENTER WITH SEAS TO 30 FT. ELSEWHERE WITHIN 300 
NM N AND 120 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 9 TO 14 
FT. REMAINDER OF AREA FROM 10N TO 24N BETWEEN 49W AND 61W WINDS 
20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE ISAAC NEAR 15.3N 60.2W. MAXIMUM 
SUSTAINED WINDS 70 KT GUSTS 85 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.3N 60.2W. MAXIMUM 
SUSTAINED WINDS 60 KT GUSTS 75 KT.
.120 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.3N 60.2W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.

...HURRICANE WARNING...
.HURRICANE HELENE NEAR 14.9N 31.5W 974 MB AT 2100 UTC SEP 10 
MOVING WNW OR 289 DEG AT 12 KT. MAXIMUM SUSTAINED WINDS 90 KT 
GUSTS 110 KT. TROPICAL STORM FORCE WINDS WITHIN 100 NM NE 
QUADRANT...70 NM SE QUADRANT...40 NM SW QUADRANT...AND 80 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 180 NM OF CENTER EXCEPT 
120 NM SW QUADRANT WITH SEAS TO 35 FT. FROM 18N TO 23N E OF 37W 
NE WINDS 20 TO 25 KT. SEAS 9 TO 10 FT. ELSEWHERE FROM 15N TO 24N 
E OF 39W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE HELENE NEAR 16.4N 35.3W. MAXIMUM 
SUSTAINED WINDS 100 KT GUSTS 120 KT. TROPICAL STORM FORCE WINDS 
WITHIN 110 NM NE QUADRANT...70 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 10 TO 16 FT. REMAINDER OF AREA FROM 10N TO 24N E OF 
44W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE HELENE NEAR 19.1N 38.0W. MAXIMUM 
SUSTAINED WINDS 75 KT GUSTS 90 KT. TROPICAL STORM FORCE WINDS 
WITHIN 120 NM NE QUADRANT...80 NM SE QUADRANT...70 NM SW 
QUADRANT...AND 100 NM NW QUADRANT. SEAS 12 FT OR GREATER OVER 
FORECAST WATERS WITHIN 360 NM NW AND 150 NM SE SEMICIRCLES WITH 
SEAS TO 35 FT. ELSEWHERE WITHIN 240 NM N AND 180 NM S 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 15 FT. REMAINDER OF 
AREA FROM 10N TO 27N E OF 50W WINDS 20 KT OR LESS. SEAS TO 11 FT 
IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 23.0N 39.4W.
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 23.0N 39.4W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 23.0N 39.4W.
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.
 
.CARIBBEAN AND GULF OF MEXICO FROM 19.5N TO 22.5N BETWEEN 82W 
AND 87W...INCLUDING THE YUCATAN CHANNEL...E TO SE WINDS 20 TO 25 
KT. SEAS TO 8 FT YUCATAN CHANNEL. SCATTERED MODERATE TO STRONG 
CONVECTION WITHIN AREA BOUNDED BY 16N81W TO 24N80W TO 23N87W TO 
16N81W.
.06 HOUR FORECAST FROM 19.5N TO 23N BETWEEN 83W AND 91W... 
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 21N TO 25N BETWEEN 85W AND 
88W...INCLUDING THE YUCATAN CHANNEL...E TO SE WINDS 20 TO 25 KT. 
SEAS LESS THAN 8 FT.
.36 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

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

$$
.FORECASTER STRIPLING. NATIONAL HURRICANE CENTER.