000
FZNT02 KNHC 312049
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL 
2230 UTC THU AUG 31 2017

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 THU AUG 31.
24 HOUR FORECAST VALID 1800 UTC FRI SEP 01.
48 HOUR FORECAST VALID 1800 UTC SAT SEP 02.

.WARNINGS.

...HURRICANE WARNING...
.HURRICANE IRMA NEAR 17.3N 34.8W 967 MB AT 2100 UTC AUG 31 
MOVING WNW OR 290 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 100 KT 
GUSTS 120 KT. TROPICAL STORM FORCE WINDS WITHIN 70 NM NE 
QUADRANT...50 NM SE QUADRANT...40 NM SW QUADRANT...AND 60 NM NW 
QUADRANT.  SEAS 12 FT OR GREATER WITHIN 60 NM NW AND SE 
QUADRANTS...90 NM NE QUADRANT AND 30 NM SW QUADRANT WITH SEAS TO 
29 FT. ELSEWHERE OVER FORECAST WATERS WITHIN 240 NM NW QUADRANT 
AND 120 NM SW QUADRANT WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. 
.24 HOUR FORECAST HURRICANE IRMA NEAR 18.2N 38.3W. MAXIMUM 
SUSTAINED WINDS 105 KT GUSTS 130 KT. TROPICAL STORM FORCE WINDS 
WITHIN 90 NM NE QUADRANT...70 NM SE QUADRANT...60 NM SW 
QUADRANT...AND 80 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
240 NM N AND 120 NM S SEMICIRCLES WITH SEAS TO 37 FT. ELSEWHERE 
OVER FORECAST WATERS WITHIN 330 NM N AND 120 NM S SEMICIRCLES 
WINDS 20 TO 33 KT. SEAS 8 TO 12 FT. 
.48 HOUR FORECAST HURRICANE IRMA NEAR 17.9N 42.9W. MAXIMUM 
SUSTAINED WINDS 105 KT GUSTS 130 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 
390 NM N AND 120 NM S SEMICIRCLES WITH SEAS TO 38 FT. ELSEWHERE 
WITHIN 360 NM N AND 120 NM S SEMICIRCLES WINDS 20 TO 33 KT. SEAS 
8 TO 12 FT. REMAINDER OF AREA FROM 14N TO 27N E OF 50W WINDS 20 
KT OR LESS. SEAS 8 TO 11 FT IN MIXED SWELL. 
.72 HOUR FORECAST HURRICANE IRMA NEAR 16.8N 47.5W. MAXIMUM 
SUSTAINED WINDS 110 KT GUSTS 135 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST HURRICANE IRMA NEAR 16.0N 52.0W. MAXIMUM 
SUSTAINED WINDS 115 KT GUSTS 140 KT.
.120 HOUR FORECAST HURRICANE IRMA NEAR 16.5N 56.5W. MAXIMUM 
SUSTAINED WINDS 120 KT GUSTS 145 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.

.ATLC 06 HOUR FORECAST N OF 30N BETWEEN 55W AND 60W WINDS 20 KT 
OR LESS. SEAS 8 FT IN NE SWELL.
.24 HOUR FORECAST N OF LINE 27N61W TO 27N52W TO 31N48W WINDS 20 
KT OR LESS. SEAS TO 10 FT IN NE SWELL.
.48 HOUR FORECAST N OF 27N E OF 50W WINDS 20 KT OR LESS. SEAS 8 
TO 11 FT IN MIXED SWELL. 

.CARIBBEAN S OF 13N BETWEEN 72W AND 75W NE TO E WINDS 20 TO 25 
KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST FROM 11N TO 14N BETWEEN 73W AND 77W NE TO E 
WINDS 20 TO 25 KT. SEAS TO 8 FT. 
.48 HOUR FORECAST FROM 11N TO 14N BETWEEN 75W AND 79W NE TO E 
WINDS 20 TO 25 KT. SEAS TO 9 FT. 

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

$$
.FORECASTER AL. NATIONAL HURRICANE CENTER.