Hurricane Force Warnings in Effect
Atlantic:  High Seas

North Atlantic High Seas Forecast

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FZNT01 KWBC 160934
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
1030 UTC FRI APR 16 2021 

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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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). 

METAREA IV BULLETIN WILL ONLY BE BROADCAST FROM THE INMARSAT 
AOE SATELLITE. PLEASE ENSURE YOUR RECEIVER IS POINTED 
CORRECTLY. 

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 APR 16. 
24 HOUR FORECAST VALID 0600 UTC APR 17. 
48 HOUR FORECAST VALID 0600 UTC APR 18. 

.WARNINGS. 

...HURRICANE FORCE WIND WARNING... 
.LOW 64N36W 970 MB MOVING S 05 KT. WITHIN 180 NM N QUADRANT 
WINDS 50 TO 65 KT. SEAS 12 TO 18 FT. ELSEWHERE WITHIN 240 NM NW 
SEMICIRCLE WINDS 35 TO 50 KT. SEAS 10 TO 16 FT. ALSO N OF 61N 
AND E OF 41W WINDS 25 TO 35 KT. SEAS 8 TO 13 FT.
.24 HOUR FORECAST LOW 63N36W 977 MB. WITHIN 240 NM NW 
SEMICIRCLE...AND FROM 57N TO 60N E OF 46W WINDS 40 TO 55 KT. 
SEAS 21 TO 30 FT. ELSEWHERE N OF 56N AND E OF 50W WINDS 25 TO 40 
KT. SEAS 12 TO 21 FT.
.48 HOUR FORECAST LOW E OF AREA 64N28W 989 MB. FROM 57N TO 60N E 
OF 45W WINDS 35 TO 50 KT. SEAS 12 TO 23 FT. ELSEWHERE FROM 56N 
TO 61N E OF 47W...AND WITHIN 240 NM W SEMICIRCLE WINDS 25 TO 35 
KT. SEAS 9 TO 15 FT.

...HURRICANE FORCE WIND WARNING... 
.LOW 62N37W 975 MB NEARLY STATIONARY. FROM 58N TO 60N E OF 48W 
WINDS 50 TO 65 KT. SEAS 21 TO 33 FT. ELSEWHERE WITHIN 360 NM S 
AND SW SEMICIRCLES WINDS 35 TO 50 KT. SEAS 12 TO 21 FT. ALSO 
WITHIN 480 NM S AND SW SEMICIRCLES WINDS 25 TO 35 KT. SEAS 9 TO 
15 FT.
.24 HOUR FORECAST LOW AND CONDITIONS ABSORBED BY LOW 63N36W 
DESCRIBED ABOVE. 

...GALE WARNING... 
.LOW 45N48W 991 MB MOVING SW 10 KT. WITHIN 240 NM NW SEMICIRCLE 
WINDS 35 TO 45 KT. SEAS 12 TO 18 FT. ELSEWHERE WITHIN 480 NM N 
AND NW SEMICIRCLES...180 NM S AND SE QUADRANTS WINDS 25 TO 35 
KT. SEAS 9 TO 15 FT.
.24 HOUR FORECAST LOW 43N51W 1006 MB. WITHIN 360 NM N AND NW 
QUADRANTS WINDS 20 TO 30 KT. SEAS 9 TO 15 FT. 
.48 HOUR FORECAST LOW DISSIPATED AND ASSOCIATED CONDITIONS 
DIMINISHED.

...GALE WARNING... 
.LOW 40N51W 994 MB MOVING NE 25 KT. WITHIN 420 NM SE AND 360 NM 
SW QUADRANTS WINDS 25 TO 40 KT. SEAS 10 TO 16 FT. 
.24 HOUR FORECAST LOW 44N39W 1003 MB. WITHIN 420 NM S 
SEMICIRCLE...AND 360 NM N AND NW QUADRANTS WINDS 25 TO 35 KT. 
SEAS 10 TO 16 FT. 
.48 HOUR FORECAST LOW AND CONDITIONS E OF AREA.

...GALE WARNING... 
.LOW 40N70W 997 MB MOVING NE 10 KT. WITHIN 240 NM OF LOW CENTER 
WINDS 25 TO 35 KT. SEAS 8 TO 13 FT.
.24 HOUR FORECAST LOW 42N69W 994 MB. WITHIN 240 NM N AND NE 
QUADRANTS...AND 360 NM S SEMICIRCLE WINDS 25 TO 35 KT. SEAS 9 TO 
15 FT. 
.48 HOUR FORECAST LOW 44N62W 998 MB. WITHIN 300 NM N AND 420 NM 
S SEMICIRCLES WINDS 25 TO 35 KT. SEAS 10 TO 16 FT. 

...GALE WARNING... 
.LOW 37N67W 999 MB MOVING NE 20 KT. WITHIN 180 NM E...480 NM 
S...AND 540 NM W QUADRANTS WINDS 25 TO 35 KT. SEAS 8 TO 13 FT.
.24 HOUR FORECAST LOW 42N61W 1001 MB. WITHIN 180 NM OF LOW 
CENTER EXCEPT 300 NM N QUADRANT...AND WITHIN 300 NM E OF A FRONT 
FROM 38N55W TO 31N66W WINDS 25 TO 35 KT. SEAS 8 TO 14 FT. 
.48 HOUR FORECAST LOW DISSIPATED WITH NEW LOW TO FORM 43N45W 
1004 MB. WITHIN 420 NM N QUADRANT...AND WITHIN 300 NM E OF A 
FRONT FROM THE LOW TO 34N56W WINDS 25 TO 35 KT. SEAS 9 TO 15 FT.

...HEAVY FREEZING SPRAY WARNING... 
.MODERATE TO HEAVY FREEZING SPRAY N OF 60N AND W OF 45W. 
ELSEWHERE LIGHT TO MODERATE FREEZING SPRAY W AND NW OF A LINE 
FROM 65N35W TO 59N41W TO 57N52W TO 52N54W.
.24 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY W AND NW OF A 
LINE FROM 64N35W TO 62N38W TO 59N39W TO 59N53W TO 52N53W.
.48 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY N OF 60N AND 
W OF 39W.

.SYNOPSIS AND FORECAST. 

.FROM 31N TO 45N E OF 37W WINDS TO 25 KT. SEAS TO 12 FT.
.24 HOUR FORECAST CONDITIONS E OF AREA.

.24 HOUR FORECAST HIGH 53N54W 1023 MB. 
.48 HOUR FORECAST HIGH 53N43W 1025 MB. 

.FORECASTER NOLT. 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 FRI APR 16.
24 HOUR FORECAST VALID 0600 UTC SAT APR 17.
48 HOUR FORECAST VALID 0600 UTC SUN APR 18.

.WARNINGS.

...ASHFALL ADVISORY... 
.LA SOUFRIERE ST. VINCENT VOLCANO AT 13.3N 61.2W IS PRODUCING 
VOLCANIC EMISSIONS FROM ITS SUMMIT. THE VOLCANO REMAINS IN A 
STATE OF UNREST AND COULD CONTINUE TO ERUPT WITH LITTLE NOTICE. 
MARINERS TRAVELING IN THE VICINITY OF LA SOUFRIERE ARE URGED TO 
EXERCISE CAUTION. IF MARINERS ENCOUNTER VOLCANIC ASH OR FLOATING 
VOLCANIC DEBRIS...YOU ARE ENCOURAGED TO REPORT THE OBSERVATION 
TO THE NATIONAL HURRICANE CENTER BY CALLING 305-229-4424.

...GULF OF MEXICO GALE WARNING...
.GULF OF MEXICO 24 HOUR FORECAST COLD FRONT FROM 30N90W TO 
21N98W. WITHIN 22N96W TO 20N97W TO 25N97W TO 27N97W TO 29N95W TO 
22N96W...INCLUDING WITHIN 60 NM OF VERACRUZ...E WINDS 20 TO 25 
KT. SEAS LESS THAN 8 FT.
.42 HOUR FORECAST COLD FRONT FROM 29N83W TO 26N90W TO 18N96W. 
WITHIN 25N96W TO 22N97W TO 27N96W TO 27N95W TO 26N96W TO 25N96W N
TO NE WINDS 25 TO 35 KT. SEAS 8 TO 10 FT. ELSEWHERE...WITHIN 
25N95W TO 21N97W TO 23N98W TO 28N97W TO 29N91W TO 
25N95W...INCLUDING WITHIN 60 NM OF VERACRUZ...N TO NE WINDS 20 TO
30 KT. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST COLD FRONT FROM 28N83W TO 25N90W TO 17N94W. 
WITHIN 25N96W TO 22N97W TO 23N98W TO 27N97W TO 27N94W TO 25N96W N
TO NE WINDS 25 TO 35 KT. SEAS 8 TO 10 FT. ELSEWHERE...WITHIN 
24N96W TO 21N96W TO 21N98W TO 27N97W TO 26N93W TO 
24N96W...INCLUDING WITHIN 60 NM OF VERACRUZ...N TO NE WINDS 20 TO
30 KT. SEAS 8 TO 10 FT. REMAINDER OF AREA...WITHIN 24N95W TO 
19N96W TO 23N98W TO 28N97W TO 29N91W TO 24N95W N TO NE WINDS 20 
TO 30 KT. SEAS LESS THAN 8 FT.

.SYNOPSIS AND FORECAST.

.ATLC COLD FRONT NW OF AREA. WITHIN 30N65W TO 30N72W TO 30N75W 
TO 31N76W TO 31N64W TO 30N65W SW WINDS 20 TO 30 KT. SEAS 8 TO 10 
FT. ELSEWHERE...WITHIN 30N38W TO 28N61W TO 30N75W TO 31N76W TO 
31N38W TO 30N38W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NW
SWELL.
.24 HOUR FORECAST COLD FRONT FROM 31N64W TO 29N81W. WITHIN 
30N64W TO 29N69W TO 30N70W TO 31N68W TO 31N63W TO 30N64W SW TO W 
WINDS 20 TO 30 KT. SEAS 8 TO 10 FT. ELSEWHERE...WITHIN 29N50W TO 
28N68W TO 30N71W TO 30N58W TO 31N43W TO 29N50W WINDS 20 KT OR 
LESS. SEAS 8 TO 9 FT IN NW SWELL.
.42 HOUR FORECAST STATIONARY FRONT FROM 31N63W TO 28N81W. WITHIN
30N57W TO 29N59W TO 30N62W TO 31N63W TO 31N56W TO 30N57W WINDS 
20 KT OR LESS. SEAS 8 TO 9 FT IN NW SWELL.
.48 HOUR FORECAST LITTLE CHANGE.

.ATLC WITHIN 12N35W TO 12N36W TO 13N36W TO 14N35W TO 12N35W
WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NE TO E SWELL.
.24 HOUR FORECAST WITHIN 07N48W TO 09N52W TO 12N44W TO 15N38W TO
12N36W TO 07N48W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NE TO E
SWELL.
.39 HOUR FORECAST WITHIN 10N46W TO 10N49W TO 12N49W TO 13N46W TO
11N45W TO 10N46W NE TO E WINDS 20 TO 25 KT. SEAS 8 TO 10 FT. 
ELSEWHERE...WITHIN 08N44W TO 07N49W TO 08N52W TO 14N51W TO 15N40W
TO 08N44W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN NE TO E SWELL.
.48 HOUR FORECAST WITHIN 08N45W TO 07N52W TO 12N56W TO 17N50W TO
17N43W TO 08N45W WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN E 
SWELL.

.CARIBBEAN WITHIN 11N70W TO 12N73W TO 11N75W TO 13N75W TO 12N73W
TO 11N70W NE TO E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
LESS THAN 8 FT.
.33 HOUR FORECAST WITHIN 11N69W TO 11N70W TO 11N71W TO 12N71W TO
12N69W TO 11N69W E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST WITHIN 11N64W TO 11N70W TO 13N72W TO 14N71W TO
12N68W TO 11N64W E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.

.CARIBBEAN WITHIN 16N85W TO 16N86W TO 17N86W TO 17N85W TO 
16N85W...INCLUDING THE GULF OF HONDURAS...E TO SE WINDS 20 TO 25
KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST WITHIN 16N85W TO 16N86W TO 18N87W TO 18N86W TO
18N85W TO 16N85W...INCLUDING THE GULF OF HONDURAS...E TO SE 
WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST WITHIN 17N86W TO 17N87W TO 18N87W TO 18N86W TO
17N86W...INCLUDING THE GULF OF HONDURAS...E TO SE WINDS 20 TO 25
KT. SEAS 8 TO 9 FT. ELSEWHERE...WITHIN 17N85W TO 16N86W TO 
17N87W TO 19N86W TO 18N85W TO 17N85W E TO SE WINDS 20 TO 25 KT. 
SEAS LESS THAN 8 FT.

.GULF OF MEXICO WITHIN 21N90W TO 19N92W TO 21N92W TO 23N89W TO
22N88W TO 21N90W...INCLUDING WITHIN 60 NM OF CAMPECHE...NE WINDS
20 TO 25 KT. SEAS LESS THAN 8 FT.
.06 HOUR FORECAST CONDITIONS IMPROVE. 

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

$$
.FORECASTER KONARIK. NATIONAL HURRICANE CENTER.