FZNT01 KWBC 181620
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
1630 UTC MON SEP 18 2023 

CCODE/2:31:04:11:00/AOE+AOW/NWS/CCODE
SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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. 

ONLY YOU KNOW THE WEATHER AT YOUR POSITION. REPORT IT TO THE 
NATIONAL WEATHER SERVICE. EMAIL US AT 
VOSOPS@NOAA.GOV(LOWERCASE). 

FOR INFORMATION ON ATLANTIC ICEBERGS SEE INFORMATION FROM NORTH 
ATLANTIC ICE SERVICE AT HTTPS://OCEAN.WEATHER.GOV/ATL_TAB.PHP 
(ALL LOWERCASE). 

FROM OCTOBER 15 TO APRIL 1, DUE TO THE CLIMATOLOGY OF THE NORTH 
ATLANTIC AND THE FREQUENCY AND VOLUME OF WEATHER HAZARDS, ALONG 
WITH CUSTOMER FEEDBACK, HIGH SEAS FORECASTS N OF 31N WILL BE 
LIMITED TO WINDS OF 25 TO 35 KNOTS AND HIGHER, AND SEAS OF 
12 FEET OR GREATER, ALONG WITH FREEZING SPRAY, DENSE FOG, AND 
VOLCANIC ASH. LESSER CONDITIONS WILL BE INCLUDED FOR WARNING 
CONDITIONS AND TO PRESERVE CONTINUITY WHERE APPROPRIATE. SEND 
FEEDBACK VIA HTTPS://OCEAN.WEATHER.GOV/CONTACT/INDEX.PHP (ALL 
LOWERCASE). 

SECURITE 

NORTH ATLANTIC NORTH OF 31N TO 67N AND WEST OF 35W 

ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS 

SYNOPSIS VALID 1200 UTC SEP 18. 
24 HOUR FORECAST VALID 1200 UTC SEP 19. 
48 HOUR FORECAST VALID 1200 UTC SEP 20. 

.WARNINGS. 

...HURRICANE WARNING...
.SEE PART 2 BELOW. IN ASSOCIATION WITH HURRICANE NIGEL S OF 
AREA...FROM 31N TO 34N BETWEEN 46W AND 56W AREA OF E TO NE WINDS 
LESS THAN 25 KT. SEAS 8 TO 12 FT IN SE SWELL.
.24 HOUR FORECAST HURRICANE NIGEL JUST S OF AREA NEAR 30.0N 
53.9W. MAXIMUM SUSTAINED WINDS 100 KT GUSTS 120 KT. TROPICAL 
STORM FORCE WINDS WITHIN 140 NM NE QUADRANT...120 NM SE 
QUADRANT...90 NM SW QUADRANT...AND 110 NM NW QUADRANT. SEAS 12 
FT OR GREATER WITHIN 210 NM W SEMICIRCLE...270 NM NE QUADRANT 
AND 240 NM SE QUADRANT WITH SEAS TO 39 FT. ELSWHERE IN 
ASSOCIATION WITH HURRICANE NIGEL FROM 31N TO 35N BETWEEN 47W AND 
59W WINDS 20 TO 33 KT. SEAS TO 12 FT. 
.48 HOUR FORECAST HURRICANE NIGEL NEAR 34.6N 54.5W. MAXIMUM
SUSTAINED WINDS 95 KT GUSTS 115 KT. TROPICAL STORM FORCE WINDS
WITHIN 140 NM NE QUADRANT...150 NM SE QUADRANT...110 NM SW
QUADRANT...AND 100 NM NW QUADRANT. SEAS 12 FT OR GREATER
WITHIN 270 NM OF CENTER EXCEPT 240 NM NW QUADRANT WITH SEAS TO 
38 FT. ELSEWHERE FROM 31N TO 39N BETWEEN 47W AND 62W WINDS 20 TO 
33 KT. SEAS TO 12 FT. 
.72 HOUR FORECAST HURRICANE NIGEL NEAR 40.3N 47.7W. MAXIMUM
SUSTAINED WINDS 85 KT GUSTS 105 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST HURRICANE NIGEL NEAR 46.5N 33.0W. MAXIMUM
SUSTAINED WINDS 70 KT GUSTS 85 KT.
.120 HOUR FORECAST POST-TROPICAL EXTRATROPICAL NIGEL NEAR 53.5N
20.0W. 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.

...GALE WARNING ... 
.E OF A LINE FROM 66N35W TO 60N40W AREA OF N TO NE WINDS 25 TO 
40 KT. SEAS 15 TO 25 FT. ELSEWHERE N OF 57N E OF 44W WINDS TO 25 
KT. SEAS 9 TO 16 FT.
.24 HOUR FORECAST NEW LOW E OF AREA NEAR 61N32W 990 MB. WITHIN 
300 NM W SEMICIRCLE WINDS 30 TO 45 KT. SEAS 15 TO 27 FT. 
ELSEWHERE N OF 53N E OF 42W WINDS 25 TO 35 KT. SEAS 10 TO 18 FT. 
.48 HOUR FORECAST LOW E OF AREA NEAR 54N23W 989 MB. WITHIN 540 
NM W AND SW QUADRANTS WINDS 25 TO 40 KT. SEAS 12 TO 21 FT. 

...GALE WARNING... 
.LOW 52N48W 992 MB MOVING NE 40 KT. WITHIN 240 NM NW SEMICIRCLE 
AND 300 NM S QUADRANT WINDS 25 TO 40 KT. SEAS 10 TO 17 FT. 
ELSEWHERE FROM 45N TO 57N BETWEEN 42W AND 58W AND WITHIN 540 NM 
SE QUADRANT WINDS 20 TO 30 KT. SEAS 8 TO 13 FT. 
.24 HOUR FORECAST LOW E OF AREA NEAR 54N20W 981 MB. FROM 42N TO 
53N E OF 43W AREA OF N TO NW WINDS 20 TO 30 KT. SEAS 10 TO 17 FT 
WITH MIXED SWELL. 
.48 HOUR FORECAST CONDITIONS E OF AREA. 

...GALE WARNING...
.LOW 38N75W 1006 MB MOVING NE 20 KT. FROM 34N TO 39N BETWEEN 70W 
AND 74W WINDS 25 TO 35 KT. SEAS 8 TO 12 FT. ELSEWHERE FROM 31N 
TO 40N BETWEEN 68W AND 75W WINDS 20 TO 30 KT. SEAS TO 9 FT.
.24 HOUR FORECAST LOW INLAND NEAR 45N68W 999 MB. WITHIN 420 NM 
NE...540 NM SE AND 360 NM S QUADRANTS WINDS 20 TO 30 KT. SEAS 8 
TO 13 FT.
.36 HOUR FORECAST LOW 48N65W 1000 MB. WITHIN 300 NM E AND 180 NM 
N QUADRANTS WINDS 25 TO 40 KT. SEAS TO 11 FT.
.48 HOUR FORECAST LOW 49N62W 1002 MB. FRONT TO EXTEND FROM 
51N58W TO 42N52W. WITHIN 180 NM NE AND E OF FRONT N OF 45N WINDS 
25 TO 35 KT. SEAS TO 11 FT. ELSEWHERE FROM 44N TO 54N BETWEEN 
58W AND 65W AND WITHIN 240 NM NE AND E OF FRONT WINDS TO 25 KT. 
SEAS TO 9 FT.

...GALE WARNING...
.LOW 37N44W 1010 MB MOVING NE 15 KT. WITHIN 180 NM E AND SE 
QUADRANTS WINDS 25 TO 35 KT. SEAS 10 TO 15 FT. ELSEWHERE FROM 
33N TO 40N BETWEEN 37W AND 47W WINDS TO 25 KT. SEAS 8 TO 12 FT 
.24 HOUR FORECAST LOW 39N39W 1013 MB. WITHIN N QUADRANT WINDS 20 
TO 30 KT. SEAS 8 TO 12 FT. 
.48 HOUR FORECAST LOW E OF AREA NEAR 38N33W 1015 MB. WITHIN 240 
NM W SEMICIRCLE WINDS TO 25 KT. SEAS TO 10 FT. 

.SYNOPSIS AND FORECAST. 

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 43N TO 46N 
BETWEEN 64W AND 68W...AND FROM 42N TO 53N BETWEEN 35W AND 52W.
.24 HOUR FORECAST DENSE FOG FROM 41N TO 46N BETWEEN 62W AND 
68W...AND N OF 60N E OF GREENLAND. 
.48 HOUR FORECAST DENSE FOG FROM 44N TO 48N BETWEEN 51W AND 55W. 

.FORECASTER BANCROFT. OCEAN PREDICTION CENTER.

NATIONAL HURRICANE CENTER MIAMI FL

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

SYNOPSIS VALID 1200 UTC MON SEP 18.
24 HOUR FORECAST VALID 1200 UTC TUE SEP 19.
48 HOUR FORECAST VALID 1200 UTC WED SEP 20.

.WARNINGS.

...ATLC HURRICANE WARNING...
.HURRICANE NIGEL NEAR 27.2N 51.4W 984 MB AT 1500 UTC SEP 18 
MOVING NW OR 325 DEG AT 10 KT. MAXIMUM SUSTAINED WINDS 70 KT 
GUSTS 85 KT. TROPICAL STORM FORCE WINDS WITHIN 140 NM NE 
QUADRANT...110 NM SE QUADRANT...50 NM SW QUADRANT...AND 120 NM NW
QUADRANT. SEAS 12 FT OR GREATER WITHIN 240 NM E SEMICIRCLE AND 
180 NM W SEMICIRCLE WITH SEAS TO 27 FT. ELSEWHERE FROM 24N TO 31N
BETWEEN 45W AND 56W WINDS 20 TO 33 KT. SEAS 10 TO 14 FT. 
REMAINDER OF AREA WITHIN 31N41W TO 31N59W TO 22N59W TO 18N54W TO 
24N43W TO 31N41W WINDS 20 KT OR LESS. SEAS 8 TO 12 FT IN MIXED 
SWELL.
.24 HOUR FORECAST HURRICANE NIGEL NEAR 30.0N 53.9W. MAXIMUM 
SUSTAINED WINDS 100 KT GUSTS 120 KT. TROPICAL STORM FORCE WINDS 
WITHIN 140 NM NE QUADRANT...120 NM SE QUADRANT...90 NM SW 
QUADRANT...AND 110 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
270 NM NE QUADRANT...240 NM SE QUADRANT...AND 210 NM W SEMICIRCLE
WITH SEAS TO 39 FT. ELSEWHERE FROM 26N TO 31N BETWEEN 48W AND 
58W WINDS 20 TO 33 KT. SEAS 10 TO 15 FT. REMAINDER OF AREA WITHIN
31N44W TO 31N61W TO 28N62W TO 22N59W TO 24N49W TO 31N44W WINDS 
20 KT OR LESS. SEAS 8 TO 13 FT IN MIXED SWELL.
.48 HOUR FORECAST HURRICANE NIGEL NEAR 34.6N 54.5W. MAXIMUM 
SUSTAINED WINDS 95 KT GUSTS 115 KT. TROPICAL STORM FORCE WINDS 
WITHIN 140 NM NE QUADRANT...150 NM SE QUADRANT...110 NM SW 
QUADRANT...AND 100 NM NW QUADRANT. SEAS 12 FT OR GREATER WITHIN 
270 NM OF CENTER EXCEPT 240 NM NW QUADRANT WITH SEAS TO 38 FT. 
OVER FORECAST WATERS FROM 26N TO 31N BETWEEN 48W AND 66W WINDS 20
KT OR LESS. SEAS 8 TO 14 FT IN MIXED NW AND NE SWELL...HIGHEST 
ALONG 31N BETWEEN 53W AND 57W.
.72 HOUR FORECAST HURRICANE NIGEL NEAR 40.3N 47.7W. MAXIMUM 
SUSTAINED WINDS 85 KT GUSTS 105 KT.
EXTENDED OUTLOOK...USE FOR GUIDANCE ONLY...ERRORS MAY BE LARGE.
.96 HOUR FORECAST HURRICANE NIGEL NEAR 46.5N 33.0W. MAXIMUM 
SUSTAINED WINDS 70 KT GUSTS 85 KT.
.120 HOUR FORECAST POST-TROPICAL EXTRATROPICAL NIGEL NEAR 53.5N 
20.0W. 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.

.ATLC 12 HOUR FORECAST WITHIN 30N35W TO 26N39W TO 22N39W TO
20N38W TO 19N35W TO 30N35W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT 
IN PRIMARILY NE SWELL.
.24 HOUR FORECAST WITHIN 28N35W TO 28N39W TO 26N41W TO 21N44W TO
19N43W TO 18N35W TO 28N35W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT 
IN PRIMARILY NE SWELL.
.48 HOUR FORECAST WITHIN 24N35W TO 26N42W TO 25N46W TO 21N47W TO
18N45W TO 19N35W TO 24N35W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT 
IN PRIMARILY NE SWELL.

.CARIBBEAN 06 HOUR FORECAST WITHIN 13N69W TO 13N73W TO 10N72W TO
11N69W TO 13N69W...INCLUDING THE GULF OF VENEZUELA...NE TO E 
WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.18 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.
.24 HOUR FORECAST LITTLE CHANGE.
.30 HOUR FORECAST WITHIN 13N69W TO 14N72W TO 11N74W TO 11N68W TO
13N69W...INCLUDING THE GULF OF VENEZUELA...NE TO E WINDS 20 TO 
25 KT. SEAS LESS THAN 8 FT.
.42 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.

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

$$
.FORECASTER HAGEN. NATIONAL HURRICANE CENTER.