HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
2230 UTC MON JUN 18 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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 JUN 18. 
24 HOUR FORECAST VALID 1800 UTC JUN 19. 
48 HOUR FORECAST VALID 1800 UTC JUN 20. 

.WARNINGS. 

...STORM WARNING... 
.FROM 43N TO 50N BETWEEN 57W AND 71W WINDS 25 TO 35 KT. SEAS 8 
TO 13 FT. ELSEWHERE FROM 40N TO 56N BETWEEN 50W AND 74W WINDS TO 
25 KT. SEAS TO 9 FT. 
.24 HOUR FORECAST COMPLEX LOW WITH FIRST LOW 56N57W 988 MB AND 
NEW SECOND LOW 52N54W 988 MB. OVER FORECAST WATERS WITHIN 480 NM 
NE...600 NM SE AND 1020 NM SW QUADRANTS WINDS 25 TO 40 KT. SEAS 
8 TO 18 FT. ELSEWHERE WITHIN 600 NM NW...660 NM NE...960 NM SE 
AND 1600 NM SW QUADRANTS WINDS TO 25 KT. SEAS TO 11 FT.
.42 HOUR FORECAST LOW 58N52W 986 MB. BETWEEN 120 NM AND 300 NM 
NE QUADRANT WINDS 35 TO 50 KT. SEAS 13 TO 20 FT.
.48 HOUR FORECAST LOW 59N54W 986 MB. OVER FORECAST WATERS 
BETWEEN 360 NM AND 1020 NM SE QUADRANT...AND WITHIN 540 NM NE 
QUADRANT WINDS 25 TO 40 KT. SEAS 11 TO 22 FT. ELSEWHERE WITHIN 
360 NM NW...660 NM NE...1380 NM SE AND 420 NM SW QUADRANTS WINDS 
TO 25 KT. SEAS 8 TO 13 FT. 

.SYNOPSIS AND FORECAST.

.LOW E OF AREA NEAR 46N33W 1010 MB MOVING NE 40 KT. OVER 
FORECAST WATERS WITHIN 300 NM NW AND 1320 NM SW QUADRANTS WINDS 
20 TO 30 KT. SEAS 8 TO 14 FT. 
.24 HOUR FORECAST CONDITIONS DIMINISHED.

.FROM 52N TO 60N E OF 50W WINDS TO 25 KT. SEAS TO 9 FT. 
.24 HOUR FORECAST FROM 53N TO 60N E OF 37W WINDS TO 25 KT. SEAS 
TO 8 FT. 
.48 HOUR FORECAST CONDITIONS MOVED E OF AREA. 

.24 HOUR FORECAST FROM 31N TO 41N E OF 50W WINDS TO 25 KT. SEAS 
TO 8 FT. 
.48 HOUR FORECAST FROM 31N TO 40N E OF 50W WINDS TO 25 KT. SEAS 
TO 8 FT. 

.DENSE FOG. 24 HOUR FORECAST VSBY OCCASIONALLY LESS THAN 1 NM 
FROM 43N TO 54N BETWEEN 45W AND 60W AND FROM 56N TO 62N BETWEEN 
56W AND 62W.
.48 HOUR FORECAST DENSE FOG FROM 46N TO 50N BETWEEN 42W AND 46W 
AND FROM 50N TO 61N E OF 43W. 

.HIGH 37N62W 1021 MB MOVING SE 20 KT. 
.24 HOUR FORECAST HIGH 35N51W 1020 MB. 
.48 HOUR FORECAST HIGH DISSIPATED. 

.HIGH 40N57W 1021 MB MOVING E 30 KT.
.24 HOUR FORECAST HIGH DISSIPATED.

.HIGH 48N46W 1024 MB MOVING E 25 KT. 
.24 HOUR FORECAST HIGH MOVED E OF AREA. 

.48 HOUR FORECAST HIGH 40N66W 1016 MB. 

.(END OF FORECAST)