152 
FZNT02 KNHC 121537
HSFAT2

HIGH SEAS FORECAST  
NWS NATIONAL HURRICANE CENTER MIAMI FL 
1630 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC WED SEP 12.
24 HOUR FORECAST VALID 1200 UTC THU SEP 13.
48 HOUR FORECAST VALID 1200 UTC FRI SEP 14.
 
.WARNINGS.

...HURRICANE WARNING...
.HURRICANE FLORENCE NEAR 29.8N 71.3W 943 MB AT 1500 UTC SEP 12 
MOVING NW OR 305 DEG AT 13 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. WINDS 20 TO 33 KT AND 
SEAS 12 FT OR GREATER WITHIN 210 NM S SEMICIRCLE...300 NM NE AND 
270 NM NW QUADRANTS WITH SEAS TO 55 FT. ELSEWHERE WITHIN AREA 
BOUNDED BY 31N77W TO 31N62W TO 23N74W TO 27N77W TO 31N77W... 
INCLUDING EXPOSED BAHAMA PASSAGES...WINDS 20 KT OR LESS. SEAS 8 
TO 12 FT PRIMARILY IN MIXED SWELL. NUMEROUS SQUALLS WITHIN 90 NM 
OF CENTER. SCATTERED TSTMS IN BANDS ELSEWHERE WITHIN 150 NM OF 
CENTER.  
.24 HOUR FORECAST HURRICANE FLORENCE NEAR 32.6N 75.1W. MAXIMUM 
SUSTAINED WINDS 125 KT GUSTS 150 KT. TROPICAL STORM FORCE WINDS 
WITHIN 160 NM NE...140 NM SE...100 NM SW AND 130 NM NW 
QUADRANTS. OVER FORECAST WATERS N OF 30N BETWEEN 71W AND 80W 
WINDS 20 TO 33 KT AND SEAS 11 TO 15 FT. ELSEWHERE WITHIN AREA 
BOUNDED BY 31N81W TO 31N67W TO 27N81W TO 31N81W WINDS 20 KT OR 
LESS. SEAS TO 11 FT PRIMARILY IN MIXED SWELL. SCATTERED TSTMS.
.48 HOUR FORECAST HURRICANE FLORENCE NEAR 33.8N 77.4W. MAXIMUM 
SUSTAINED WINDS 105 KT GUSTS 130 KT. LITTLE CHANGE IN RADIUS OF 
TROPICAL STORM FORCE WINDS AND SEAS 12 FT OR GREATER. OVER 
FORECAST WATERS N OF 30N BETWEEN 71W AND 78W WINDS 20 KT OR 
LESS. SEAS TO 10 FT PRIMARILY IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE FLORENCE NEAR 33.6N 78.4W. 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 33.6N 78.4W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
.120 HOUR FORECAST TROPICAL DEPRESSION FLORENCE NEAR 33.6N
78.4W. MAXIMUM SUSTAINED WINDS 25 KT GUSTS 35 KT.

...HURRICANE WARNING...
.HURRICANE HELENE NEAR 20.3N 36.5W 977 MB AT 1500 UTC SEP 12 
MOVING N-NW OR 340 DEG AT 12 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. WINDS 20 TO 33 KT AND 
SEAS 12 FT OR GREATER WITHIN 240 NM E AND 300 NM W SEMICIRCLES 
WITH SEAS TO 36 FT. ELSEWHERE OVER FORECAST WATERS FROM 11N TO 
25N BETWEEN 35W AND 48W WINDS 20 KT OR LESS. SEAS TO 11 FT 
PRIMARILY IN MIXED SWELL. SCATTERED TSTMS IN BANDS WITHIN 120 NM 
OF CENTER. 
.24 HOUR FORECAST HURRICANE HELENE NEAR 24.5N 37.5W. MAXIMUM 
SUSTAINED WINDS 65 KT GUSTS 80 KT. TROPICAL STORM FORCE WINDS 
WITHIN 110 NM NW AND SE QUADRANTS...140 NM NE AND 80 NM SW 
QUADRANTS. WINDS 20 TO 33 KT AND SEAS 12 FT OR GREATER WITHIN 
210 NM E AND 270 NM W SEMICIRCLES WITH SEAS TO 30 FT. ELSEWHERE 
FROM 15N TO 31N BETWEEN 35W AND 55W WINDS 20 KT OR LESS. SEAS TO 
11 FT PRIMARILY IN MIXED SWELL. SCATTERED TSTMS IN BANDS WITHIN 
150 NM OF CENTER. 
.48 HOUR FORECAST TROPICAL STORM HELENE NEAR 31.0N 36.5W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE
WINDS WITHIN 130 NM NE...120 NM SE...70 NM SW AND 90 NM NW
QUADRANTS. WINDS 20 TO 33 KT AND SEAS 12 FT OR GREATER WITHIN 
210 NM OF CENTER WITH SEAS TO 30 FT. ELSEWHERE FROM 23N TO 32N
BETWEEN 35W AND 60W WINDS 20 KT OR LESS. SEAS TO 11 FT PRIMARILY 
IN MIXED SWELL. SCATTERED TSTMS IN BANDS WITHIN 120 NM OF 
CENTER. 
.72 HOUR FORECAST TROPICAL STORM HELENE NEAR 37.7N 33.2W.
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 37.7N 33.2W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
.120 HOUR FORECAST TROPICAL STORM HELENE NEAR 37.7N 33.2W.
MAXIMUM SUSTAINED WINDS 45 KT GUSTS 55 KT.
  
...TROPICAL STORM WARNING...
.TROPICAL STORM ISAAC NEAR 15.0N 54.7W 1000 MB AT 1500 UTC SEP 
12 MOVING W OR 275 DEG AT 15 KT. MAXIMUM SUSTAINED WINDS 50 KT 
GUSTS 60 KT. TROPICAL STORM FORCE WINDS WITHIN 120 NM NE...100 
NM SE...20 NM SW AND 150 NM NW QUADRANTS. WINDS 20 TO 33 KT AND 
SEAS 12 FT OR GREATER WITHIN 180 NM N AND 60 NM S SEMICIRCLES 
WITH SEAS TO 25 FT. ELSEWHERE WITHIN 510 NM N AND 210 NM S 
SEMICIRCLES WINDS 20 KT OR LESS. SEAS TO 10 FT PRIMARILY IN 
MIXED SWELL. SCATTERED TSTMS IN BANDS WITHIN 270 NM E OF CENTER. 
.24 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.3N 59.4W. MAXIMUM 
SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE WINDS 
WITHIN 90 NM N SEMICIRCLE AND 60 NM SE QUADRANT. WINDS 20 TO 33 
KT AND SEAS 12 FT OR GREATER WITHIN 210 NM N AND 75 NM S 
SEMICIRCLES WITH SEAS TO 19 FT. ELSEWHERE FROM 13N TO 23N 
BETWEEN 55W AND 65W...INCLUDING CARIBBEAN PASSAGES...WINDS 20 KT 
OR LESS. SEAS TO 11 FT PRIMARILY IN MIXED SWELL. SCATTERED TSTMS 
IN BANDS WITHIN 120 NM OF CENTER. 
.48 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.4N 65.6W. MAXIMUM 
SUSTAINED WINDS 40 KT GUSTS 50 KT. TROPICAL STORM FORCE WINDS 
WITHIN 80 NM NE...40 NM SE AND 70 NM NW QUADRANTS. WINDS 20 TO 
33 KT AND SEAS 8 TO 12 FT WITHIN 120 NM OF CENTER. ATLC S OF 25N 
BETWEEN 60W AND 70W...INCLUDING NE CARIBBEAN PASSAGES... WINDS 
20 KT OR LESS. SEAS TO 8 FT PRIMARILY IN MIXED SWELL. SCATTERED 
TSTMS IN BANDS WITHIN 90 NM OF CENTER. 
.72 HOUR FORECAST TROPICAL STORM ISAAC NEAR 15.5N 71.0W. MAXIMUM 
SUSTAINED WINDS 40 KT GUSTS 50 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 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 LOW PRES 23.5N 91.5W 1009 MB WITH TROUGH S TO
18N92W. WITHIN 45 NM OF 24N90W E TO SE WINDS 20 TO 25 KT. SEAS
LESS THAN 8 FT. SCATTERED TSTMS.
.24 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
25.5N 94W 1009 MB WITH TROUGH S TO 18N94W. WITHIN 240 NE QUADRANT
OF LOW E TO SE WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT. SCATTERED
TSTMS.
.48 HOUR FORECAST LOW PRES...POSSIBLE TROPICAL CYCLONE...NEAR 
27N97W 1009 MB. WITHIN 180 NM NE SEMICIRCLE E TO SE WINDS 20 TO 
25 KT. SEAS TO 8 FT. SCATTERED TSTMS N OF 25N W OF 91W.

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

$$
.FORECASTER NELSON. NATIONAL HURRICANE CENTER.