960 
FZNT02 KNHC 120905
HSFAT2

HIGH SEAS FORECAST  
NWS NATIONAL HURRICANE CENTER MIAMI FL 
1030 UTC WED SEP 12 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 WED SEP 12.
24 HOUR FORECAST VALID 0600 UTC THU SEP 13.
48 HOUR FORECAST VALID 0600 UTC FRI SEP 14.
 
.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 29.0N 70.1W 945 MB AT 0900 UTC SEP 12 
MOVING NW OR 305 DEG AT 15 KT. MAXIMUM SUSTAINED WINDS 115 KT 
GUSTS 140 KT. TROPICAL STORM FORCE WINDS WITHIN 150 NM NE...140 
NM SE...100 NM SW AND 130 NM NW QUADRANTS. SEAS 12 FT OR GREATER 
WITHIN 180 NM W SEMICIRCLE...240 NM NE QUADRANT AND 150 NM SE 
QUADRANT WITH SEAS TO 42 FT. ELSEWHERE WITHIN 270 NM NE AND 120 
NM SW SEMICIRCLES WINDS 20 TO 33 KT. SEAS 9 TO 12 FT. REMAINDER 
OF AREA N OF 24N BETWEEN 61W AND 75W WINDS 20 KT OR LESS. SEAS 
TO 11 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 32.0N 74.4W. 
MAXIMUM SUSTAINED WINDS 125 KT GUSTS 150 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 
300 NM NE AND 210 NM SW SEMICIRCLES WITH SEAS TO 45 FT. 
ELSEWHERE OVER FORECAST WATERS WITHIN 240 NM SE SEMICIRCLE WINDS 
20 TO 33 KT. SEAS 10 TO 12 FT. REMAINDER OF AREA N OF 27N W OF 
67W WINDS 20 KT OR LESS. SEAS TO 11 FT IN MIXED SWELL .
.48 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 33.8N 77.3W. 
MAXIMUM SUSTAINED WINDS 105 KT GUSTS 130 KT. TROPICAL STORM 
FORCE WINDS N OF AREA WITHIN 100 NM W SEMICIRCLE...160 NM NE 
QUADRANT AND 140 NM SE QUADRANT. SEAS 12 FT OR GREATER N OF AREA 
WITHIN 270 NM OF CENTER WITH SEAS TO 36 FT. N OF 29N BETWEEN 72W 
AND 79W WINDS 20 KT OR LESS. SEAS 8 TO 12 FT IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE FLORENCE N OF AREA NEAR 33.8N 78.2W. 
MAXIMUM SUSTAINED WINDS 85 KT GUSTS 105 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM FLORENCE NEAR 33.8N 78.2W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE NEAR 33.8N 
78.2W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.


...HURRICANE WARNING...
.HURRICANE HELENE NEAR 19.2N 35.7W 977 MB AT 0900 UTC SEP 12 
MOVING NNW OR 335 DEG AT 11 KT. MAXIMUM SUSTAINED WINDS 80 KT 
GUSTS 100 KT. TROPICAL STORM FORCE WINDS WITHIN 150 NM NE...110 
NM SE...90 NM SW AND 140 NM NW QUADRANTS. SEAS 12 FT OR GREATER 
WITHIN 240 NM E AND 300 NM W SEMICIRCLES WITH SEAS TO 35 FT. 
ELSEWHERE OVER FORECAST WATERS WITHIN 240 NM N AND 180 NM S 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 12 FT. REMAINDER OF 
AREA FROM 11N TO 25N E OF 45W WINDS 20 KT OR LESS. SEAS TO 11 FT 
IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE HELENE NEAR 22.9N 37.2W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS 
WITHIN 110 NM NW AND SE QUADRANTS...140 NM NE QUADRANT AND 80 NM 
SW QUADRANT.SEAS 12 FT OR GREATER WITHIN 240 NM N AND 180 NM S 
SEMICIRCLES WITH SEAS TO 32 FT. ELSEWHERE WITHIN 240 NM N AND 
180 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 10 TO 12 FT. 
REMAINDER OF AREA N OF 15N E OF 50W WINDS 20 KT OR LESS. SEAS TO 
11 FT IN MIXED SWELL.
.48 HOUR FORECAST TROPICAL STORM HELENE NEAR 28.9N 36.9W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE 
WINDS WITHIN 130 NM NE...120 NM SE...70 NM SW AND 90 NM NW 
QUADRANTS. SEAS 12 FT OR GREATER WITHIN 240 NM OF CENTER WITH 
SEAS TO 30 FT. WITHIN 210 NM OF CENTER WINDS 20 TO 33 KT. 
REMAINDER OF AREA N OF 23N E OF 50W WINDS 20 KT OR LESS. SEAS TO 
11 FT IN MIXED SWELL.
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 36.0N 34.3W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM HELENE NEAR 36.0N 34.3W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 45.5N 19.0W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT.

...TROPICAL STORM WARNING...
.TROPICAL STORM ISAAC NEAR 14.5N 53.5W 1000 MB AT 0900 UTC SEP 
12 MOVING W OR 270 DEG AT 13 KT. MAXIMUM SUSTAINED WINDS 50 KT 
GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 90 NM N AND 20 NM 
S SEMICIRCLES. SEAS 12 FT OR GREATER WITHIN 180 NM N AND 90 NM S 
SEMICIRCLES WITH SEAS TO 19 FT. ELSEWHERE WITHIN 150 NM N AND 60 
NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER 
OF AREA FROM 12N TO 22N BETWEEN 49W AND 58W WINDS 20 KT OR LESS. 
SEAS TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.0N 58.6W. MAXIMUM 
SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE WINDS 
WITHIN 80 NM NE...30 NM SE...0 NM SW AND 60 NM NW QUADRANTS. 
SEAS 12 FT OR GREATER WITHIN 120 NM N AND 45 NM S SEMICIRCLES 
WITH SEAS TO 16 FT. ELSEWHERE WITHIN 150 NM N AND 75 NM S 
SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. REMAINDER OF 
AREA FROM 13N TO 23N BETWEEN 53W AND 63W WINDS 20 KT OR LESS. 
SEAS TO 10 FT IN MIXED SWELL.
.48 HOUR FORECAST TROPICAL STORM ISAAC IN CARIBBEAN SEA NEAR 
15.4N 64.8W. MAXIMUM SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL 
STORM FORCE WINDS WITHIN 70 NM NE...30 NM SE...0 NM SW AND 50 NM 
NW QUADRANTS. SEAS 12 FT OR GREATER WITHIN 60 NM N AND 15 NM S 
SEMICIRCLES WITH SEAS TO 14 FT. ELSEWHERE WITHIN 120 NM N AND 45 
NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 8 TO 11 FT. 
.72 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.3N 70.6W. MAXIMUM 
SUSTAINED WINDS 40 KT GUSTS 50 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.3N 70.6W. MAXIMUM 
SUSTAINED WINDS 35 KT GUSTS 45 KT.
.120 HOUR FORECAST...DISSIPATED.

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 20N89W TO 26N88W. FROM 22N TO 26N E 
OF TROUGH TO 86W E TO SE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST TROUGH FROM 22N94W TO 27N92W. FROM 25N TO 29N 
BETWEEN 90W AND 94W E TO SE WINDS 20 TO 25 KT. SEAS LESS THAN 8 
FT. 
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
26N96W 1010 MB. WITHIN 120 NM N SEMICIRCLE E TO SE WINDS 20 TO 
25 KT. SEAS TO 8 FT.

.ATLC 24 HOUR FORECAST N OF 29N BETWEEN 40W AND 52W WINDS 20 KT 
OR LESS. SEAS 8 TO 9 FT IN N TO NE SWELL.
.48 HOUR FORECAST CONDITIONS MERGED WITH MIXED SWELL FROM HELENE.

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

$$
.FORECASTER MUNDELL. NATIONAL HURRICANE CENTER.