HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
2230 UTC SUN FEB 18 2018 

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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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

PAN PAN 

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

SYNOPSIS VALID 1800 UTC FEB 18 
24 HOUR FORECAST VALID 1800 UTC FEB 19 
48 HOUR FORECAST VALID 1800 UTC FEB 20 

.WARNINGS. 

...HURRICANE FORCE WIND WARNING... 
.LOW 42N62W 986 MB MOVING E 35 KT. WITHIN 90 NM W AND 120 NM S 
QUADRANTS WINDS 60 TO 80 KT. SEAS 18 TO 36 FT...HIGHEST S AND SW 
OF LOW. ALSO WITHIN 120 NM N AND NW SEMICIRCLES AND 150 NM SW 
AND S QUADRANTS AND FROM 37N TO 41N BETWEEN 56W AND 66W WINDS 45 
TO 60 KT. SEAS 12 TO 25 FT...HIGHEST S OF LOW. ELSEWHERE WITHIN 
240 NM NW AND N...360 NM E AND 420 NM S QUADRANTS AND FROM 34N 
TO 40N BETWEEN 63W AND 68W  WINDS 30 TO 45 KT. SEAS 8 TO 16 FT.
.24 HOUR FORECAST LOW 42N44W 981 MB. WITHIN 240 NM W SEMICIRCLE 
WINDS 55 TO 75 KT. SEAS 24 TO 48 FT...HIGHEST SW OF LOW. ALSO 
WITHIN 300 NM OF LOW EXCEPT 360 NM SW QUADRANT WINDS 40 TO 55 
KT. SEAS 18 TO 35 FT. ELSEWHERE WITHIN 360 NM N AND NE 
SEMICIRCLES...540 NM S AND 480 NM SW QUADRANTS WINDS 30 TO 45 
KT. SEAS 12 TO 27 FT. 
.48 HOUR FORECAST LOW 41N36W 991 MB. FRONT TO EXTEND FROM LOW TO 
44N40W TO 49N35W. WITHIN 180 NM S AND 360 NM SW AND W QUADRANTS 
AND WITHIN 150 NM W OF FRONT S OF 47N WINDS 45 TO 60 KT. SEAS 18 
TO 42 FT...HIGHEST SW OF LOW. ELSEWHERE OVER FORECAST WATERS E 
OF A LINE FROM 51N36W TO 50N47W TO 34N44W WINDS 30 TO 45 KT. 
SEAS 13 TO 32 FT...HIGHEST SW QUADRANT. 

...HURRICANE FORCE WIND WARNING... 
.LOW 58N37W 955 MB MOVING E 20 KT NEXT 6 HOURS THEN TURNING MORE 
N AND THEN AFTER 24 HOURS TURNING W. FRONT EXTENDS FROM LOW TO 
59N39W TO 63N35W. OVER FORECAST WATERS WITHIN 180 NM SW AND W 
QUADRANTS AND WITHIN 120 NM W AND NW OF FRONT WINDS 50 TO 65 KT. 
SEAS IN ICE FREE WATERS 19 TO 34 FT. ALSO WITHIN 420 NM S AND 
300 NM W QUADRANTS AND WITHIN 180 NM NW AND N OF FRONT WINDS 35 
TO 50 KT. SEAS 17 TO 36 FT...HIGHEST NEAR 51N38W. ELSEWHERE N OF 
A LINE FROM 45N35W TO 50N49W TO 54N51W WINDS 25 TO 40 KT. SEAS 9 
TO 18 FT...EXCEPT S OF 55N 15 TO 31 FT.
.24 HOUR FORECAST LOW E OF AREA NEAR 65N30W 967 MB AND A NEW LOW 
FORMING NEAR 64N39W 975 MB. FROM 58N TO 62N E OF 43W AREA OF W 
TO SW WINDS 45 TO 60 KT. SEAS 18 TO 35 FT. ELSEWHERE BETWEEN 90 
NM AND 540 NM S QUADRANT WINDS 30 TO 45 KT. SEAS 12 TO 28 
FT...HIGHEST NEAR 58N35W.
.36 HOUR FORECAST LOW 65N38W 966 MB. FROM 60N TO 63N E OF 42W 
AREA OF SW WINDS 50 TO 65 KT. SEAS 24 TO 38 FT.
.48 HOUR FORECAST LOW 65N38W 983 MB. WITHIN 240 NM S AND SE 
QUADRANTS WINDS 40 TO 55 KT. SEAS 18 TO 40 FT...HIGHEST NEAR 
63N40W. ELSEWHERE N OF 60N E OF 43W WINDS 25 TO 40 KT. SEAS 10 
TO 21 FT.

...GALE WARNING... 
.LOW 61N60W 1002 MB MOVING N 15 KT. WINDS LESS THAN 25 KT. SEAS 
LESS THAN 8 FT.
.24 HOUR FORECAST LOW 65N59W 999 MB. WITHIN 360 NM S QUADRANT 
WINDS 25 TO 35 KT. SEAS IN ICE FREE WATERS 8 TO 16 FT.
.48 HOUR FORECAST LOW 66N60W 1005 MB. BETWEEN 180 NM AND 420 NM 
S QUADRANT WINDS 25 TO 35 KT. SEAS TO 12 FT. 

...GALE WARNING...
.36 HOUR FORECAST LOW 55N57W 1013 MB. OVER FORECAST WATERS 
WITHIN 240 NM SE SEMICIRCLE AND W OF A LINE FROM 51N52W TO 
40N65W WINDS TO 25 KT. SEAS TO 10 FT.
.48 HOUR FORECAST LOW 59N45W 995 MB. WITHIN 180 NM SE AND S 
QUADRANTS WINDS 30 TO 45 KT. SEAS 11 TO 18 FT. ELSEWHERE FROM 
53N TO 60N BETWEEN 41W AND 54W WINDS 25 TO 35 KT. SEAS 8 TO 15 
FT. 

...HEAVY FREEZING SPRAY WARNING... 
.MODERATE TO HEAVY FREEZING SPRAY OVER ICE FREE FORECAST WATERS 
W AND NW OF A LINE FROM 62N50W TO 60N57W TO 50N47W. 
.24 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY NW AND W OF A 
LINE FROM 60N44W TO 52N50W.
.48 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY W OF A LINE 
FROM 65N35W TO 60N45W TO 50N50W.

.SYNOPSIS AND FORECAST. 

.HIGH 43N47W 1030 MB MOVING NE 40 KT. 
.24 HOUR FORECAST HIGH E OF AREA. 

.24 HOUR FORECAST HIGH 40N65W 1039 MB. 
.48 HOUR FORECAST HIGH 36N57W 1037 MB. 

.(END OF FORECAST)