449 
FZNT02 KNHC 101549
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL 
1630 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC MON SEP 10.
24 HOUR FORECAST VALID 1200 UTC TUE SEP 11.
48 HOUR FORECAST VALID 1200 UTC WED SEP 12.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 25.0N 60.0W 962 MB AT 1500 UTC SEP 10 
MOVING W OR 280 DEG AT 11 KT. MAXIMUM SUSTAINED WINDS 100 KT 
GUSTS 120 KT. TROPICAL STORM FORCE WINDS WITHIN 110 NM NW AND SE 
QUADRANTS...120 NM NE QUADRANT AND 60 NM SW QUADRANT.  SEAS 12 
FT OR GREATER WITHIN 210 NM NE QUADRANT...90 NM SE QUADRANT... 
120 NM SW QUADRANT...AND 180 NM NW QUADRANT WITH SEAS TO 36 FT. 
ELSEWHERE WITHIN 240 NM NE...180 NM SE...120 NM SW...AND 180 NM 
NW QUADRANTS WINDS 20 TO 33 KT. SEAS 10 TO 17 FT. REMAINDER OF 
AREA N OF 22N BETWEEN 53W AND 64W WINDS 20 KT OR LESS. SEAS TO 
10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE FLORENCE NEAR 26.4N 64.7W. MAXIMUM 
SUSTAINED WINDS 125 KT GUSTS 150 KT. TROPICAL STORM FORCE WINDS 
WITHIN 120 NM NW AND SE QUADRANTS...140 NM NE QUADRANT AND 70 NM 
SW QUADRANT. SEAS 12 FT OR GREATER WITHIN 210 NM N AND 150 NM S 
SEMICIRCLES WITH SEAS TO 46 FT. ELSEWHERE WITHIN 270 NM NE AND 
120 NM SW SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 17 FT. 
REMAINDER OF AREA N OF 22N BETWEEN 57W AND 68W WINDS 20 KT OR 
LESS. SEAS TO 11 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE FLORENCE NEAR 29.5N 71.0W. MAXIMUM 
SUSTAINED WINDS 130 KT GUSTS 160 KT. TROPICAL STORM FORCE WINDS 
WITHIN 150 NM NE QUADRANT...140 NM SE QUADRANT...80 NM SW 
QUADRANT...AND 120 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
270 NM N AND 240 NM S SEMICIRCLES WITH SEAS TO 50 FT. ELSEWHERE 
WITHIN 300 NM NE AND 120 NM SW SEMICIRCLES WINDS 20 TO 33 KT. 
SEAS 10 TO 20 FT. REMAINDER OF AREA N OF 22N BETWEEN 63W AND 77W 
WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL E OF BAHAMAS.
.72 HOUR FORECAST HURRICANE FLORENCE NEAR 33.0N 76.3W. MAXIMUM 
SUSTAINED WINDS 125 KT GUSTS 150 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST HURRICANE FLORENCE NEAR 33.0N 76.3W. MAXIMUM 
SUSTAINED WINDS 75 KT GUSTS 90 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE NEAR 33.0N 
76.3W. MAXIMUM SUSTAINED WINDS 30 KT GUSTS 40 KT.

...HURRICANE WARNING...
.HURRICANE ISAAC NEAR 14.7N 43.9W 993 MB AT 1500 UTC SEP 10 
MOVING W OR 275 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 24 FT. ELSEWHERE WITHIN 270 NM NE AND 90 NM SW 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF 
AREA FROM 12N TO 24N BETWEEN 36W AND 46W WINDS 20 KT OR LESS. 
SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE ISAAC NEAR 15.0N 48.7W. 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 210 NM N AND 75 NM S SEMICIRCLES WITH SEAS TO 28 
FT. ELSEWHERE WITHIN 270 NM N AND 90 NM S SEMICIRCLES WINDS 20 
TO 33 KT. SEAS 10 TO 13 FT. REMAINDER OF AREA FROM 12N TO 23N 
BETWEEN 42W AND 52W WINDS 20 KT OR LESS. SEAS TO 10 FT IN MIXED 
SWELL.
.48 HOUR FORECAST HURRICANE ISAAC NEAR 15.1N 54.0W. 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 90 NM S 
SEMICIRCLES OF CENTER WITH SEAS TO 30 FT. ELSEWHERE WITHIN 240 
NM N AND 150 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 14 
FT. REMAINDER OF AREA FROM 11N TO 24N BETWEEN 48W AND 59W WINDS 
20 KT OR LESS. SEAS TO 10 FT IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE ISAAC NEAR 15.4N 59.4W. 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 15.4N 59.4W. MAXIMUM 
SUSTAINED WINDS 60 KT GUSTS 75 KT.
.120 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.7N 70.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.

...HURRICANE WARNING...
.HURRICANE HELENE NEAR 14.6N 30.0W 974 MB AT 1500 UTC SEP 10 
MOVING WNW OR 285 DEG AT 14 KT. MAXIMUM SUSTAINED WINDS 90 KT 
GUSTS 105 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM NE 
QUADRANT...70 NM SE QUADRANT...40 NM SW QUADRANT...AND 80 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 NM NW AND 120 NM SE 
SEMICIRCLES WITH SEAS TO 32 FT. FROM 19N 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 15.9N 34.3W. 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 
300 NM NW AND 120 NM SE SEMICIRCLES WITH SEAS TO 40 FT. 
ELSEWHERE OVER FORECAST WATERS E OF LINE FROM 12N37W TO 20N40W 
TO 22N38W WINDS 20 TO 33 KT. SEAS 10 TO 19 FT. REMAINDER OF AREA 
FROM 10N TO 24N E OF 42W WINDS 20 KT OR LESS. SEAS TO 11 FT IN 
MIXED SWELL.
.48 HOUR FORECAST HURRICANE HELENE NEAR 18.0N 37.7W. 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 90 NM NW QUADRANT. SEAS 12 FT OR GREATER OVER 
FORECAST WATERS WITHIN 360 NM NW AND 120 NM SE SEMICIRCLES WITH 
SEAS TO 35 FT. ELSEWHERE WITHIN 270 NM N AND 180 NM S 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 20 FT. REMAINDER OF 
AREA FROM 11N TO 25N E OF 48W WINDS 20 KT OR LESS. SEAS TO 11 FT 
IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 21.5N 39.5W.
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 21.5N 39.5W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 21.5N 39.5W.
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.
 
.06 HOUR CARIBBEAN AND GULF OF MEXICO FORECAST FROM 19.5N TO 22N 
BETWEEN 84W AND 87W...INCLUDING THE YUCATAN CHANNEL...E TO SE 
WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT. SCATTERED MODERATE TO 
STRONG CONVECTION FROM 17N TO 23N BETWEEN 80W AND 87W.
.12 HOUR FORECAST FROM 19.5N TO 23N BETWEEN 84W AND 89W... 
INCLUDING THE YUCATAN CHANNEL...E TO SE WINDS 20 TO 25 KT. SEAS 
TO 8 FT. YUCATAN CHANNEL. WINDS 20 KT OR LESS. SEAS LESS THAN 8 
FT.
.24 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.