High Seas Forecast
Issued by NWS

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861
FZNT01 KWBC 212139
HSFAT1

HIGH SEAS FORECAST FOR METAREA IV
NWS OCEAN PREDICTION CENTER WASHINGTON DC
2230 UTC SAT APR 21 2018

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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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

SEE ANNOUNCEMENT OF PLANNED INMARSAT I-3 TO I-4 MIGRATION
IN 2018 AT OCEAN.WEATHER.GOV/GMDSS_NOTICE.PHP (LOWERCASE).

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
AMERICAN ICE SERVICE AT HTTPS://OCEAN.WEATHER.GOV/ATL_TAB.SHTML

SECURITE

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

SYNOPSIS VALID 1800 UTC APR 21.
24 HOUR FORECAST VALID 1800 UTC APR 22.
48 HOUR FORECAST VALID 1800 UTC APR 23.

.WARNINGS.

...GALE WARNING...
.LOW 52N51W 992 MB MOVING NE 15 KT. OVER FORECAST WATERS WITHIN
540 NM N SEMICIRCLE...WITHIN 660 NM SW AND 540 NM SE
QUADRANTS...AND WITHIN 420 NM SE OF A FRONT FROM 49N41W TO
31N59W WINDS 25 TO 35 KT. SEAS 8 TO 16 FT.
.24 HOUR FORECAST LOW 55N45W 989 MB. WITHIN 720 NM S AND 540 NM
N SEMICIRCLES...AND WITHIN 360 NM SE OF A FRONT FROM 45N35W TO
34N55W WINDS 25 TO 40 KT. SEAS 8 TO 14 FT...EXCEPT WITHIN 480 NM
SE QUADRANT SEAS 13 TO 18 FT.
.48 HOUR FORECAST LOW 55N37W 991 MB. WITHIN 600 NM S AND
SW...720 NM W...AND 480 NM N QUADRANTS...AND WITHIN 360 NM SE OF
A FRONT FROM 44N35W TO 36N44W WINDS 25 TO 40 KT. SEAS 8 TO 15
FT...EXCEPT WITHIN 480 NM S QUADRANT SEAS 14 TO 21 FT.

...GALE WARNING...
.48 HOUR FORECAST OVER FORECAST WATERS FROM 31N TO 34N W OF 70W
WINDS 25 TO 40 KT. SEAS 8 TO 13 FT.

.SYNOPSIS AND FORECAST.

.48 HOUR FORECAST OVER ICE FREE FORECAST WATERS W OF A LINE FROM
56N54W TO 62N53W WINDS TO 25 KT. SEAS TO 8 FT.

.LIGHT FREEZING SPRAY NW OF A LINE FROM 59N60W TO 64N52W.
.24 HOUR FORECAST LIGHT FREEZING SPRAY NW OF A LINE FROM 59N60W
TO 63N52W.
.48 HOUR FORECAST LIGHT FREEZING SPRAY N OF 59N W OF 54W.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 90 NM OF
47N36W.
.24 HOUR FORECAST CONDITIONS IMPROVED.

.HIGH 35N36W 1031 MB DRIFTING E.
.24 HOUR FORECAST HIGH 35N35W 1029 MB.
.48 HOUR FORECAST HIGH MOVED E OF AREA.

.HIGH 37N75W 1030 MB DRIFTING E.
.24 HOUR FORECAST HIGH 37N73W 1031 MB.
.48 HOUR FORECAST HIGH 39N69W 1033 MB.

.FORECASTER SOMMERVILLE. 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 1800 UTC SAT APR 21.
24 HOUR FORECAST VALID 1800 UTC SUN APR 22.
48 HOUR FORECAST VALID 1800 UTC MON APR 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.ATLC COLD FRONT FROM 31N61W TO 28N69W THEN STATIONARY TO
27.5N80W. FROM 27N TO 30N W OF 76W E WINDS 20 TO 25 KT. SEAS TO
10 FT. S OF 21N BETWEEN 70W AND 74W NE TO E WINDS 20 TO 25 KT.
SEAS LESS THAN 8 FT.
.24 HOUR FORECAST COLD FRONT FROM 31N54W TO 28N62W THEN
STATIONARY TO 27N70W. FROM 26.5N TO 29N W OF 77W E WINDS 20 TO
25 KT. SEAS TO 9 FT. S OF 21N BETWEEN 70W AND 74W E WINDS 20 TO
25 KT. SEAS LESS THAN 8 FT.
.48 HOUR STATIONARY FRONT FROM 31N53W TO 28N68W...THEN WEAK WARM
FRONT TO 27N75W. N OF 28N W OF 73W SE WINDS 20 TO 30 KT. SEAS TO
11 FT.

.ATLC SE OF LINE FROM 29N35W TO 29N40W TO 10N56W WINDS 20 KT OR
LESS. SEAS TO 9 FT IN N SWELL.
.24 HOUR FORECAST FROM 15N TO 24N BETWEEN 35W AND 43W WINDS 20
KT OR LESS. SEAS TO 8 FT IN N SWELL.
.42 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.CARIBBEAN FROM 10.5N TO 14N BETWEEN 71W AND 77W NE TO E WINDS
20 TO 30 KT. SEAS TO 11 FT. ELSEWHERE FROM 10N TO 17N BETWEEN
74W AND 82W WINDS 20 KT OR LESS. SEAS TO 9 FT PRIMARILY IN E
SWELL. N OF 17N BETWEEN 71W AND 74W E WINDS 20 TO 25 KT. SEAS
LESS THAN 8 FT.
.24 HOUR FORECAST FROM 10.5N TO 123.5 BETWEEN 69W AND 76W NE TO
E WINDS 20 TO 25 KT. SEAS TO 10 FT. ELSEWHERE FROM 10N TO 14N
BETWEEN 74W AND 80W WINDS 20 KT OR LESS. SEAS TO 9 FT PRIMARILY
IN E SWELL. N OF 17N BETWEEN 71W AND 74W E WINDS 20 TO 25 KT.
SEAS LESS THAN 8 FT.
.48 HOUR FORECAST FROM 11N TO 13N BETWEEN 70W AND 78W NE TO E
WINDS 20 TO 25 KT. SEAS TO 8 FT.

.GULF OF MEXICO STATIONARY FRONT FROM 27N82W TO 27N94W. N OF
29N E OF 87W E WINDS 20 TO 25 KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST COLD FRONT FROM 30N94W TO 27N97W. WINDS 20 KT
OR LESS. SEAS LESS THAN 8 FT. SCATTERED TSTMS N OF 27N WITHIN
180 NM E OF COLD FRONT.
.48 HOUR FORECAST COLD FRONT FROM 30N86W TO 19N93W. WINDS 20 KT
OR LESS. SEAS LESS THAN 8 FT. SCATTERED TSTMS N OF 28N WITHIN
180 NM E OF FRONT.

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

$$
.FORECASTER NELSON. NATIONAL HURRICANE CENTER.



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