High seas forecast issued; storm and gale warnings for North Atlantic.

FZNT01 KWBC 181006
HSFAT1 1030

HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1030 UTC WED DEC 18 2024

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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
[email protected](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 18.
24 HOUR FORECAST VALID 0600 UTC DEC 19.
48 HOUR FORECAST VALID 0600 UTC DEC 20.

.WARNINGS.

…STORM WARNING…
.LOW 58N58W 995 MB MOVING NE 30 KT. WITHIN 240 NM NE AND E OF A
LINE FROM 54N56W TO 50N55W TO 48N54W AND WITHIN 180 NM E AND SE
OF LINE FROM 48N54W TO 41N62W WINDS 25 TO 35 KT. SEAS 8 TO 12 FT.
ELSEWHERE WITHIN 480 NM E…780 NM SE AND 1260 NM S AND SW
QUADRANTS…INCLUDING THE GULF OF SAINT LAWRENCE SEAS TO 10 FT.
.24 HOUR FORECAST LOW DISSIPATED INLAND WITH NEW LOW TO FORM NEAR
42N69W 1008 MB. WITHIN 180 NM NE…540 NM SE AND 720 NM SW
QUADRANTS WINDS 25 TO 35 KT. SEAS 8 TO 12 FT.
.48 HOUR FORECAST NEW LOW 54N44W 988 MB. WITHIN 300 NM E…420 NM
SE AND 600 NM SW QUADRANTS WINDS 35 TO 50 KT. SEAS 11 TO 22 FT.
ELSEWHERE WITHIN 240 NM SE OF A FRONT FROM 46N49W TO 36N64W AND
FROM 46N TO 55N E OF 59W…INCLUDING THE GULF OF SAINT LAWRENCE
WINDS 25 TO 35 KT. SEAS 8 TO 16 FT…EXCEPT TO 9 FT IN THE GULF
OF SAINT LAWRENCE.

…GALE WARNING…
.LOW 62N41W 1008 MB MOVING NE 05 KT. WITHIN 120 NM N AND NE OF A
LINE FROM 59N47W TO 63N55W TO W GREENLAND WINDS 30 TO 40 KT. SEAS
8 TO 15 FT. ELSEWHERE N OF 60N W OF GREENLAND SEAS 8 TO 12 FT.
.24 HOUR FORECAST LOW 63N37W 990 MB. WITHIN 60 NM NW AND N OF A
LINE FROM 61N39W TO 65N35W…WITHIN 90 NM N AND NE OF A LINE FROM
60N47W TO 61N50W AND WITHIN AN AREA BOUNDED BY A LINE FROM 53N35W
TO 46N43W TO 45N42W TO 49N35W TO 53N35W WINDS 30 TO 40 KT. SEAS
10 TO 20 FT…HIGHEST NEAR 50N39W. ELSEWHERE FROM 45N TO 50N E OF
44W…FROM 50N TO 60N E OF 50W…FROM 60N TO 63N E OF 55W TO
GREENLAND AND N OF 64N E OF GREENLAND WINDS 20 TO 30 KT. SEAS 8
TO 15 FT IN MIXED SWELL.
.48 HOUR FORECAST LOW NE OF AREA 66N30W 980 MB. FROM 55N TO 60N E
OF 43W AND FROM 60N TO 62N E OF GREENLAND WINDS 25 TO 35 KT. SEAS
8 TO 17 FT…HIGHEST NEAR 62N35W.

…GALE WARNING…
.30 HOUR FORECAST NEW LOW 32N38W 1020 MB. FROM 31N TO 36N E OF
41W WINDS 25 TO 35 KT. SEAS 8 TO 14 FT.
.48 HOUR FORECAST LOW 32N43W 1010 MB. WITHIN 540 NM NE…120 NM
E…240 NM W AND 300 NM NW QUADRANTS WINDS 25 TO 40 KT. SEAS 9 TO
19 FT…HIGHEST NEAR 33N44W.

…GALE WARNING…
.42 HOUR FORECAST NEW LOW 61N57W 992 MB. WITHIN 180 NM FROM LOW
WINDS 25 TO 35 KT. SEAS 8 TO 12 FT.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN LOW 61N58W 981 MB. FROM
59N TO 62N BETWEEN 53W AND 61W WINDS 30 TO 40 KT. SEAS 9 TO 16
FT. ELSEWHERE FROM 55N TO 64N W OF 46W WINDS 25 TO 35 KT. SEAS 8
TO 12 FT.

…HEAVY FREEZING SPRAY WARNING…
.MODERATE TO HEAVY FREEZING SPRAY NW AND N OF A LINE FROM 61N63W
TO 67N54W. ELSEWHERE LIGHT TO MODERATE FREEZING SPRAY FROM 56N TO
60N W OF 60W