North Atlantic High Seas Forecast

Hurricane Warnings in Effect
North Atlantic High Seas Forecast

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FZNT01 KWBC 211016
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
1030 UTC SAT DEC 21 2024 

CCODE/2:31:04:01:00/AOE/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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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). 

SECURITE 

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

ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS 

SYNOPSIS VALID 0600 UTC DEC 21. 
24 HOUR FORECAST VALID 0600 UTC DEC 22. 
48 HOUR FORECAST VALID 0600 UTC DEC 23. 

.WARNINGS. 

...HURRICANE FORCE WIND WARNING... 
.LOW 42N65W 992 MB MOVING NE 30 KT. FROM 31N TO 48N BETWEEN 51W 
AND 76W WINDS 25 TO 40 KT. SEAS 8 TO 16 FT. 
.06 HOUR FORECAST LOW 43N63W 989 MB. FROM 37N TO 46N BETWEEN 54W 
AND 63W WINDS 35 TO 50 KT. SEAS 11 TO 21 FT. 
.24 HOUR FORECAST LOW 52N55W 972 MB. WITHIN 300 NM NE AND 360 NM 
SE QUADRANTS WINDS 40 TO 55 KT. SEAS 12 TO 24 FT. ELSEWHERE 
WITHIN 720 NM NE...960 NM SE...600 NM SW...AND 300 NM NW 
QUADRANTS WINDS 25 TO 40 KT. SEAS 10 TO 20 FT.
.30 HOUR FORECAST LOW 53N54W 966 MB. WITHIN 240 NM SE...AND N 
AND NW QUADRANTS...AND FROM 58N TO 60N BETWEEN 43W AND 49W WINDS 
50 TO 65 KT. SEAS 15 TO 30 FT...HIGHEST NEAR 53N50W. 
.48 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER 63N37W 961 MB. 
WITHIN 180 NM N AND NE...AND 90 NM SW QUADRANTS WINDS 50 TO 65 
KT. SEAS 21 TO 36 FT. ALSO N OF 61N E OF GREENLAND...AND FROM 
53N TO 58N E OF 47W WINDS 35 TO 50 KT. SEAS 18 TO 39 
FT...HIGHEST NEAR 57N38W. ELSEWHERE N OF 51N E OF 58W WINDS 25 
TO 35 KT. SEAS 14 TO 28 FT.   

...STORM WARNING... 
.FROM 57N TO 61N E OF 48W AREA OF W WINDS 40 TO 55 KT. SEAS 15 
TO 27 FT. ELSEWHERE FROM 52N TO 62N E OF 52W AREA OF W TO NW 
WINDS 25 TO 40 KT. SEAS 12 TO 24 FT.
.24 HOUR FORECAST FROM 62N TO 65N E OF 40W AREA OF W TO NW WINDS 
25 TO 40 KT. SEAS 8 TO 15 FT.
.48 HOUR FORECAST CONDITIONS DESCRIBED ABOVE WITH COMPLEX LOW IN 
FIRST WARNING. 

...GALE WARNING... 
.12 HOUR FORECAST FROM 34N TO 40N BETWEEN 69W AND 76W AREA OF NW 
WINDS 25 TO 35 KT. SEAS 8 TO 14 FT. 
.24 HOUR FORECAST NEW LOW 38N62W 1009 MB. FROM 33N TO 44N 
BETWEEN 62W AND 75W WINDS 20 TO 30 KT. SEAS 8 TO 14 FT. 
.48 HOUR FORECAST LOW 43N48W 1006 MB. WITHIN 600 NM E AND 
NE...540 NM S AND SE...240 NM SW...AND 180 NM NW QUADRANTS WINDS 
25 TO 35 KT. SEAS 9 TO 16 FT. ELSEWHERE FROM 31N TO 47N E OF 
54W...AND FROM 34N TO 44N BETWEEN 54W AND 65W WINDS 20 TO 30 KT. 
SEAS 8 TO 14 FT. 

...HEAVY FREEZING SPRAY WARNING... 
.MODERATE TO HEAVY FREEZING SPRAY N OF 54N W OF 56W...AND N OF 
61N BETWEEN 48W AND 56W. ELSEWHERE LIGHT TO MODERATE FREEZING 
SPRAY NW AND N OF A LINE FROM 47N63W TO 52N50W TO 
60N46W...INCLUDING THE GULF OF SAINT LAWRENCE...AND N OF 64N E 
OF GREENLAND.
.24 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY N OF 48N W OF 
60W OVER THE GULF OF SAINT LAWRENCE...NW AND N OF A LINE FROM 
55N59W TO 61N60W TO 63N51W...AND N OF 64N E OF GREENLAND. 
ELSEWHERE LIGHT TO MODERATE FREEZING SPRAY NW AND N OF A LINE 
FROM 42N70W TO 51N57W TO 59N46W TO 62N35W. 
.48 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY W AND NW OF A 
LINE FROM 48N64W TO 51N58W OVER THE GULF OF SAINT LAWRENCE...AND 
N AND NW OF A LINE FROM 53N56W TO 61N47W. ELSEWHERE LIGHT TO 
MODERATE FREEZING SPRAY NW AND N OF A LINE FROM 43N68W TO 50N53W 
TO 60N44W...INCLUDING THE GULF OF SAINT LAWRENCE...AND WITHIN 60 
NM OF THE SE GREENLAND COAST N OF 60N. 

.SYNOPSIS AND FORECAST. 

.LOW 32N43W 1010 MB MOVING N 10 KT. FROM 31N TO 42N E OF 46W 
WINDS 20 TO 30 KT. SEAS TO 12 FT. 
.24 HOUR FORECAST LOW 36N43W 1014 MB. FROM 31N TO 41N E OF 44W 
WINDS 20 TO 30 KT. SEAS TO 12 FT. 
.48 HOUR FORECAST LOW DISSIPATED WITH CONDITIONS DESCRIBED WITH 
LOW 43N48W IN WARNINGS SECTION ABOVE.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 40N TO 49N 
BETWEEN 57W AND 70W. 
.24 HOUR FORECAST DENSE FOG FROM 47N TO 58N BETWEEN 51W AND 
65W...FROM 56N TO 60N E OF 51W...AND N OF 64W W OF GREENLAND.
.48 HOUR FORECAST DENSE FOG FROM 43N TO 48N BETWEEN 46W AND 
52W...N OF 62N W OF GREENLAND...AND N OF 63N E OF GREENLAND.

.FORECASTER MILLS. 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 0600 UTC SAT DEC 21.
24 HOUR FORECAST VALID 0600 UTC SUN DEC 22.
48 HOUR FORECAST VALID 0600 UTC MON DEC 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.ATLC LOW PRES N OF AREA NEAR 32N43W. WITHIN 31N37.5W TO 
31N39.5W TO 30N39W TO 30.5N38W TO 30.5N37.5W TO 31N37.5W S WINDS 
20 TO 25 KT. SEAS 9 TO 11 FT. ELSEWHERE WITHIN 31N35W TO 30N43W 
TO 31N53W TO 24N48W TO 22N35W TO 31N35W WINDS 20 KT OR LESS. 
SEAS 8 TO 10 FT IN NE SWELL.
.24 HOUR FORECAST WITHIN 31N35W TO 31N39W TO 27N37W TO 23N35W TO
31N35W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN E SWELL.
.48 HOUR FORECAST WITHIN 31N35W TO 31N39W TO 23N37W TO 17N38W TO
15N35W TO 31N35W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NE TO E
SWELL.

.ATLC WITHIN 27N62W TO 28N62W TO 27N63W TO 26N63W TO 26N62W TO
27N62W S WINDS 20 TO 25 KT. SEAS 8 FT. ELSEWHERE WITHIN 20N45W 
TO 25N60W TO 28N63W TO 26N72W TO 18N62W TO 08N57W TO 
20N45W...INCLUDING IN ATLANTIC EXPOSURES AND PASSAGES...WINDS 20
KT OR LESS. SEAS 8 TO 9 FT IN NE TO E SWELL.
.24 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.

.ATLC COLD FRONT FROM 31N69W TO 24N76W. SECOND COLD FRONT FROM
31N72W TO 25N77W TO 23N81W. WITHIN 31N68W TO 31N74W TO 30N74W TO
30N72W TO 31N68W W TO NW WINDS 20 TO 25 KT. SEAS 8 TO 9 FT. 
ELSEWHERE WITHIN 31N74W TO 31N79W TO 30N79W TO 28N77W TO 28N76W 
TO 30N74W TO 31N74W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN NW 
SWELL.
.24 HOUR FORECAST COLD FRONT FROM 31N62W TO 22N79W. SECOND COLD 
FRONT FROM 31N69W TO 27N80W. WITHIN 31N65W TO 31N77W TO 30N75W TO
29N69W TO 31N65W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN N SWELL.
.48 HOUR FORECAST COLD FRONT FROM 31N56W TO 22N74W. SECOND COLD 
FRONT FROM 31N58W TO 22N79W. WITHIN 31N51W TO 31N75W TO 30N80W TO
27N77W TO 26N65W TO 28N61W TO 31N51W WINDS 20 KT OR LESS. SEAS 8
TO 9 FT IN N SWELL.

.ATLC WITHIN 31N62W TO 31N69W TO 30N69W TO 30N65W TO 29N63W TO
31N62W S TO SW WINDS 20 TO 25 KT. SEAS 8 FT.
.24 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.

.ATLC 06 HOUR FORECAST WITHIN 14N43W TO 11N44W TO 08N40W TO
08N38W TO 09N37W TO 14N43W WINDS 20 KT OR LESS. SEAS 8 FT IN N 
TO NE SWELL.
.24 HOUR FORECAST WITHIN 11N40W TO 11N43W TO 13N44W TO 13N48W TO
07N45W TO 07N36W TO 11N40W WINDS 20 KT OR LESS. SEAS 8 FT IN NE 
SWELL.
.48 HOUR FORECAST WITHIN 10N40W TO 14N50W TO 12N55W TO 07N51W TO
07N39W TO 10N40W WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN NE TO E 
SWELL.

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

$$
.FORECASTER ADAMS. NATIONAL HURRICANE CENTER.