749 
FZNT02 KNHC 291004
HSFAT2

HIGH SEAS FORECAST
NWS NATIONAL HURRICANE CENTER MIAMI FL
1030 UTC WED SEP 29 2021

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.

SECURITE

ATLANTIC FROM 07N TO 31N W OF 35W INCLUDING CARIBBEAN SEA AND
GULF OF MEXICO

SYNOPSIS VALID 0600 UTC WED SEP 29.
24 HOUR FORECAST VALID 0600 UTC THU SEP 30.
48 HOUR FORECAST VALID 0600 UTC FRI OCT  1.

.WARNINGS.

...ATLC HURRICANE WARNING...
.HURRICANE SAM NEAR 18.9N 56.2W 950 MB AT 0900 UTC SEP 29 MOVING
NW OR 310 DEG AT 8 KT. MAXIMUM SUSTAINED WINDS 115 KT GUSTS 140 
KT. TROPICAL STORM FORCE WINDS WITHIN 110 NM NE QUADRANT...100 NM
SE QUADRANT...80 NM SW QUADRANT...AND 90 NM NW QUADRANT. SEAS 12
FT OR GREATER WITHIN 180 NM N SEMICIRCLE...105 NM SE QUADRANT 
AND 150 NM SW QUADRANT WITH SEAS TO 33 FT. ELSEWHERE WITHIN 
18N54W TO 17N55W TO 18N58W TO 20N57W TO 20N54W TO 18N54W WINDS 20
TO 33 KT. SEAS 10 TO 12 FT. REMAINDER OF AREA WITHIN 15N53W TO 
15N58W TO 20N63W TO 25N59W TO 22N51W TO 15N53W WINDS 20 KT OR 
LESS. SEAS 8 TO 10 FT IN MIXED SWELL.
.24 HOUR FORECAST HURRICANE SAM NEAR 21.0N 58.9W. MAXIMUM 
SUSTAINED WINDS 120 KT GUSTS 145 KT. TROPICAL STORM FORCE WINDS 
WITHIN 110 NM E SEMICIRCLE...90 NM SW QUADRANT AND 100 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 150 NM OF CENTER EXCEPT 
120 NM SE QUADRANT WITH SEAS TO 37 FT. ELSEWHERE WITHIN 19N57W TO
19N59W TO 22N61W TO 24N59W TO 22N56W TO 19N57W WINDS 20 TO 33 
KT. SEAS 10 TO 12 FT. REMAINDER OF AREA WITHIN 15N57W TO 19N66W 
TO 26N64W TO 27N56W TO 23N53W TO 15N57W WINDS 20 KT OR LESS. SEAS
8 TO 10 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE SAM NEAR 25.2N 61.5W. MAXIMUM 
SUSTAINED WINDS 115 KT GUSTS 140 KT. TROPICAL STORM FORCE WINDS 
WITHIN 130 NM E SEMICIRCLE...90 NM SW QUADRANT AND 100 NM NW 
QUADRANT. SEAS 12 FT OR GREATER WITHIN 180 NM OF CENTER EXCEPT 
150 NM SE QUADRANT WITH SEAS TO 42 FT. ELSEWHERE WITHIN 23N60W TO
23N62W TO 26N64W TO 28N60W TO 27N59W TO 23N60W WINDS 20 TO 33 
KT. SEAS 10 TO 12 FT. REMAINDER OF AREA WITHIN 25N54W TO 19N62W 
TO 21N69W TO 29N68W TO 31N55W TO 25N54W WINDS 20 KT OR LESS. SEAS
8 TO 10 FT IN MIXED SWELL.
.72 HOUR FORECAST HURRICANE SAM NEAR 30.8N 61.5W. MAXIMUM 
SUSTAINED WINDS 110 KT GUSTS 135 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST HURRICANE SAM NEAR 35.8N 57.5W. MAXIMUM 
SUSTAINED WINDS 95 KT GUSTS 115 KT.
.120 HOUR FORECAST HURRICANE SAM NEAR 40.8N 52.0W. MAXIMUM 
SUSTAINED WINDS 80 KT GUSTS 100 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 24 HOUR FORECAST WITHIN 18N35W TO 24N39W TO 28N39W TO
30N35W TO 18N35W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN NE TO E 
SWELL.
.48 HOUR FORECAST WITHIN 14N35W TO 16N43W TO 27N44W TO 29N35W TO
14N35W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NE TO E SWELL.

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

$$
.FORECASTER AREINHART. NATIONAL HURRICANE CENTER.