FZNT01 KWBC 200350
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
0430 UTC TUE MAY 20 2025

CCODE/1:31:04:01:00/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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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).

MARINERS SHOULD NOTE THAT FORECASTS FOR SEAS ARE IN UNITS OF
METERS.

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

FOR ANY TROPICAL CYCLONE INFORMATION BEYOND 48 HOURS REFERENCE 
THE ASSOCIATED NWS TROPICAL CYCLONE FORECAST/ADVISORY (TCM).

SECURITE

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

ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS

SYNOPSIS VALID 0000 UTC MAY 20. 
24 HOUR FORECAST VALID 0000 UTC MAY 21.
48 HOUR FORECAST VALID 0000 UTC MAY 22.

.WARNINGS.

...GALE WARNING...
.COMPLEX LOW WITH MAIN CENTER 53N47W 1001 MB MOVING SW 15 KT.
FROM 53N TO 60N BETWEEN 40W AND 52W WINDS 25 TO 40 KT. SEAS 3 TO
5.5 M. ELSEWHERE FROM 50N TO 61N E OF 60W WINDS TO 25 KT. SEAS TO
3.5 M.
.24 HOUR FORECAST COMPLEX LOW DESCRIBED WITH LOW 44N50W BELOW.
WITHIN 360 NM NW OF A LINE FROM 49N52W TO 52N50W TO 60N37W AREA
OF NE WINDS 25 TO 35 KT. SEAS TO 4 M. ELSEWHERE FROM 47N TO 60N
NW OF A LINE FROM 47N48W TO 60N37W AREA OF N TO NE WINDS TO 25
KT. SEAS TO 3 M.
.48 HOUR FORECAST NEW LOW NEAR 58N35W 1004 MB. FROM 51N TO 61N E
OF 50W WINDS 20 TO 30 KT. SEAS TO 3.5 M.

...GALE WARNING...
.COMPLEX LOW WITH FIRST CENTER 44N64W 998 MB MOVING SE 10 KT AND
SECOND CENTER 40N61W 998 MB MOVING NE 10 KT. WITHIN 480 NM SE AND
360 NM SW QUADRANTS OF SECOND CENTER WINDS 20 TO 30 KT. SEAS TO
3.5 M. ELSEWHERE WITHIN THE GULF OF SAINT LAWRENCE AND WITHIN 300
NM W SEMICIRCLE OF FIRST CENTER WINDS TO 25 KT. SEAS TO 3 M.
.24 HOUR FORECAST COMPLEX LOW WITH FIRST CENTER 40N61W 1001 MB
AND SECOND CENTER NEAR 44N50W 1002 MB. WITHIN 360 NM S...AND 300
NM W AND NW QUADRANTS OF FIRST CENTER....AND WITHIN 480 NM SE
SEMICIRCLE AND 540 NM SW QUADRANT OF SECOND CENTER WINDS 20 TO 30
KT. SEAS TO 3.5 M...HIGHEST SE OF SECOND CENTER.
.42 HOUR FORECAST LOW 40N54W 1002 MB. WITHIN 360 NM SE OF A FRONT
FROM 43N44W TO 31N53W WINDS 25 TO 35 KT. SEAS TO 4 M. 
.48 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER 41N52W 1004 MB.
WITHIN 360 NM SE OF A LINE FROM 47N40W TO 33N50W WINDS 25 TO 35
KT. SEAS TO 4 M. ELSEWHERE WITHIN 300 NM NW AND 420 NM SW
QUADRANTS...AND S OF 53N E OF 49W. SEAS TO 3 M.

.SYNOPSIS AND FORECAST.

.LOW 46N48W 999 MB MOVING NE 10 KT. WITHIN 720 NM SE AND 840 NM S
QUADRANTS WINDS 20 TO 30 KT. SEAS TO 3.5 M. 
.24 HOUR FORECAST LOW 49N51W 1000 MB. WITHIN 240 NM NE AND 420 NM
SE QUADRANTS WINDS 20 TO 30 KT. SEAS TO 3 M.
.48 HOUR FORECAST LOW AND CONDITIONS DESCRIBED BY LOW 41N52W IN
WARNINGS SECTION ABOVE.

.48 HOUR FORECAST NEW LOW 36N75W 1005 MB. S OF 40N W OF 69W WINDS
20 TO 30 KT. SEAS TO 2.5 M.

.48 HOUR FORECAST N OF 50N W OF 49W AREA OF N TO NW WINDS 20 TO
30 KT. SEAS TO 3.5 M...HIGHEST NEAR 53N54W AND 64N54W.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 44N TO 46N
BETWEEN 41W AND 60W...AND FROM 49N TO 54N W OF 49W.
.24 HOUR FORECAST DENSE FOG FROM 44N TO 54N E OF 56W...AND N OF
63N E OF GREENLAND.
.48 HOUR FORECAST DENSE FOG N OF 55N E OF 42W...AND WITHIN 180 NM
SE OF A LINE FROM 51N35W TO 42N54W.

.24 HOUR FORECAST LIGHT FREEZING SPRAY NW OF A LINE FROM 60N60W
TO 64N52W.
.48 HOUR FORECAST LIGHT FREEZING SPRAY NW OF A LINE FROM 61N60W
TO 64N52W.

.FORECASTER ANDERSON. OCEAN PREDICTION CENTER.

NWS NATIONAL HURRICANE CENTER MIAMI FL

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

SYNOPSIS VALID 0000 UTC TUE MAY 20.
24 HOUR FORECAST VALID 0000 UTC WED MAY 21.
48 HOUR FORECAST VALID 0000 UTC THU MAY 22.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.ATLC WITHIN 09N47W TO 09N48W TO 08N49W TO 08N48W TO 07N47W TO
07N46W TO 09N47W WINDS 20 KT OR LESS. SEAS 2.5 M IN NE TO E 
SWELL.
.09 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 2.5 M.

.ATLC 36 HOUR FORECAST WITHIN 31N49.5W TO 31N50.5W TO 31N50W TO
31N49.5W S TO SW WINDS 20 TO 25 KT. SEAS TO 2.5 M IN SW SWELL.
.48 HOUR FORECAST WITHIN 31N49W TO 31N50W TO 31N49.5W TO 31N49W 
WINDS 20 KT OR LESS. SEAS 2.5 M IN SW TO W SWELL.

.CARIBBEAN GULF OF HONDURAS WITHIN 17N85W TO 17N86W TO 16N86W TO
16N85W TO 17N85W E WINDS 20 TO 30 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST GULF OF HONDURAS WITHIN 16N85W TO 17N86W TO 
16N86W TO 16N85W E WINDS 20 TO 30 KT. SEAS LESS THAN 2.5 M.
.48 HOUR FORECAST GULF OF HONDURAS WITHIN 17N85W TO 17N86W TO 
16N86W TO 16N85W TO 17N85W E WINDS 20 TO 25 KT. SEAS LESS THAN 
2.5 M.

.GULF OF AMERICA WITHIN 23N88W TO 23N89W TO 22N90W TO 21N89W TO 
22N88W TO 23N88W E TO SE WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST WITHIN 22.5N88W TO 22.5N88.5W TO 22N89W TO 
22N87.5W TO 22.5N88W E TO SE WINDS 20 TO 25 KT. SEAS LESS THAN 
2.5 M.
.30 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 2.5 M.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

.FORECASTER STRIPLING. NATIONAL HURRICANE CENTER.

$$