HIGH SEAS FORECAST FOR METAREA IV 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
1030 UTC SUN APR 22 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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 0600 UTC APR 22. 
24 HOUR FORECAST VALID 0600 UTC APR 23. 
48 HOUR FORECAST VALID 0600 UTC APR 24. 

.WARNINGS. 

...GALE WARNING... 
.LOW 54N49W 990 MB MOVING NE 15 KT. WITHIN 360 NM N AND NW...AND 
420 NM S AND SE QUADRANTS...AND 240 NM SE OF FRONT FROM 47N37W 
TO 40N45W WINDS 25 TO 35 KT. SEAS 8 TO 16 FT. 
.24 HOUR FORECAST LOW 56N40W 990 MB. WITHIN 420 NM SW...480 NM S 
...AND BETWEEN 180 NM AND 360 NM N QUADRANTS WINDS 25 TO 40 KT. 
SEAS 10 TO 22 FT. 
.48 HOUR FORECAST LOW E OF AREA 58N30W 991 MB. FROM 48N TO 60N E 
OF 42W WINDS 20 TO 30 KT. SEAS 8 TO 16 FT. 

...GALE WARNING... 
.24 HOUR FORECAST FROM 31N TO 35N W OF 75W WINDS TO 25 KT. SEAS 
TO 8 FT.
.48 HOUR FORECAST FROM 31N TO 35N W OF 75W WINDS 25 TO 35 KT. 
SEAS 8 TO 16 FT. 

.SYNOPSIS AND FORECAST. 

.LIGHT FREEZING SPRAY N OF 61N AND W OF 54W. 
.24 HOUR FORECAST CONDITIONS IMPROVED. 
.48 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY N OF 62N AND 
W OF 52W. 

.HIGH 35N36W 1031 MB DRIFTING E. 
.24 HOUR FORECAST HIGH E OF AREA.  

.HIGH 37N74W 1030 MB DRIFTING E. 
.24 HOUR FORECAST HIGH 38N72W 1031 MB. 
.48 HOUR FORECAST HIGH DISSIPATED. 

.48 HOUR FORECAST HIGH 41N65W 1033 MB. 

.(END OF FORECAST)