North Pacific High Seas Forecast

FZPN01 KWBC 210951
HSFEP1

HIGH SEAS FORECAST 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
1030 UTC WED MAY 21 2025 

SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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). 

MARINERS SHOULD NOTE THAT FORECASTS FOR SEAS ARE IN UNITS OF 
METERS. 

FOR ANY TROPICAL CYCLONE INFORMATION BEYOND 48 HOURS REFERENCE 
THE ASSOCIATED NWS TROPICAL CYCLONE FORECAST/ADVISORY (TCM). 

SECURITE 

PACIFIC N OF 30N AND S OF 67N E OF A LINE FROM BERING STRAIT 
TO 50N 160E 

ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS 

SYNOPSIS VALID 0600 UTC MAY 21. 
24 HOUR FORECAST VALID 0600 UTC MAY 22. 
48 HOUR FORECAST VALID 0600 UTC MAY 23. 

.WARNINGS. 

...GALE WARNING...
.LOW 43N144W 1014 MB MOVING E 20 KT. WITHIN 180 NM NE SEMICIRCLE 
WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE FROM 40N TO 45N 
BETWEEN 143W AND 148W WINDS TO 25 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW 43N132W 1018 MB. FROM 37N TO 42N BETWEEN 
135W AND 141W WINDS LESS THAN 20 KT. SEAS 2.5 TO 3.5 M. 
.48 HOUR FORECAST LOW DISSIPATED AND CONDITIONS DIMINISHED. 

...GALE WARNING...
.LOW 55N163W 992 MB MOVING E 20 KT. FROM 45N TO 51N BETWEEN 161W 
AND 171W WINDS 25 TO 35 KT. SEAS 3.5 TO 4.5 M. ELSEWHERE FROM 
43N TO 59N BETWEEN 157W AND 169E WINDS 20 TO 30 KT. SEAS 2.5 TO 
3.5 M.  
.24 HOUR FORECAST LOW 56N155W 999 MB. WITHIN 300 NM SW 
QUADRANT...AND WITHIN 120 NM NE AND N OF A LINE FROM 51N146W TO 
56N150W TO 57N157W WINDS 25 TO 35 KT. SEAS 3 TO 5 M...HIGHEST SW 
OF LOW CENTER. ELSEWHERE FROM 44N TO 59N BETWEEN 144W AND 168W 
WINDS TO 25 KT. SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST LOW 53N146W 1002 MB. FROM 51N TO 59N BETWEEN 
140W AND 154W WINDS LESS THAN 25 KT. SEAS 2.5 TO 3.5 M. 

...GALE WARNING...
.LOW 48N165E 998 MB MOVING NE 25 KT. FROM 44N TO 47N W OF 168E 
WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5 M.
.24 HOUR FORECAST LOW 54N175E 999 MB. FROM 45N TO 57N BETWEEN 
172W AND 168E WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M. 
.48 HOUR FORECAST COMPLEX LOW WITH MEAN CENTER 52N158W 1006 MB. 
FROM 45N TO 53N BETWEEN 139W AND 179E WINDS TO 25 KT. SEAS 2.5 
TO 3.5 M. 

...GALE WARNING...
.36 HOUR FORECAST LOW W OF AREA 44N155E 989 MB. FROM 45N TO 49N 
W OF 166E WINDS 25 TO 40 KT. SEAS TO 3 M.
.48 HOUR FORECAST LOW W OF AREA 48N158E 979 MB. WITHIN 180 NM SE 
QUADRANT...AND N OF 50N W OF 167E WINDS 35 TO 45 KT. SEAS 3 TO 
4.5 M. ELSEWHERE WITHIN AREA W OF A LINE FROM 37N160E TO 48N173E 
TO 54N169E WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5 M.  

.SYNOPSIS AND FORECAST. 

.FROM 31N TO 42N BETWEEN 119W AND 127W WINDS 20 TO 30 KT. SEAS 3 
TO 5 M. ELSEWHERE S OF 52N BETWEEN 119W AND 131W WINDS LESS THAN 
25 KT. SEAS 2.5 TO 3.5 M.
.24 HOUR FORECAST S OF 39N BETWEEN 118W AND 128W WINDS TO 25 KT. 
SEAS 2.5 TO 3.5 M. 
.48 HOUR FORECAST S OF 36N BETWEEN 119W AND 125W WINDS TO 25 KT. 
SEAS TO 3 M. 

.LOW S OF AREA 23N176E 1009 MB DRIFTING W 05 KT. S OF 34N 
BETWEEN 178W AND 179E WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.  
.24 HOUR FORECAST LOW S OF AREA 24N173E 1008 MB. S OF 33N 
BETWEEN 179W AND 174E WINDS LESS THAN 25 KT. SEAS TO 3 M. 
.48 HOUR FORECAST LOW S OF AREA 26N168E 1010 MB. S OF 36N 
BETWEEN 178W AND 169E WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M. 

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 41N TO 48N 
BETWEEN 175E AND 165E...AND N OF 55N BETWEEN 162W AND 168W.
.24 HOUR FORECAST DENSE FOG FROM 54N TO 57N W OF 179E...AND FROM 
39N TO 41N W OF 161E.  
.48 HOUR FORECAST DENSE FOG FROM 43N TO 53N BETWEEN 172E AND 
162E...AND WITHIN 60 NM S OF A LINE FROM 46N166W TO 44N176W TO 
43N172E.

.LIGHT FREEZING SPRAY N OF 59N BETWEEN 168W AND 174W. 
.24 HOUR FORECAST LIGHT FREEZING SPRAY N OF 58N BETWEEN 168W AND 
178W. 
.48 HOUR FORECAST LIGHT FREEZING SPRAY N OF 59N BETWEEN 168W AND 
174W. 

.FORECASTER POCHE. OCEAN PREDICTION CENTER.

NATIONAL HURRICANE CENTER MIAMI FL

E PACIFIC FROM THE EQUATOR TO 30N E OF 140W AND 03.4S TO THE
EQUATOR E OF 120W

SYNOPSIS VALID 0600 UTC WED MAY 21.
24 HOUR FORECAST VALID 0600 UTC THU MAY 22.
48 HOUR FORECAST VALID 0600 UTC FRI MAY 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WITHIN 10N128W TO 12N135W TO 12N140W TO 05N140W TO 08N129W TO
10N128W NE TO E WINDS 20 TO 25 KT. SEAS 2.5 TO 3.0 M IN N TO NE
SWELL.
.24 HOUR FORECAST WITHIN 12N121W TO 15N140W TO 07N140W TO 
08N120W TO 12N121W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN E 
SWELL.
.48 HOUR FORECAST WITHIN 09N127W TO 13N134W TO 14N140W TO 
07N140W TO 06N132W TO 07N128W TO 09N127W WINDS 20 KT OR LESS. 
SEAS 2.5 M IN NE SWELL.

.WITHIN 25N132W TO 30N123W TO 26N132W TO 26N135W TO 22N140W TO
24N130W TO 25N132W NE TO E WINDS 20 TO 25 KT. SEAS 2.5 M.
ELSEWHERE WITHIN 29N119W TO 30N131W TO 26N133W TO 26N140W TO 
17N140W TO 29N119W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN N TO
NE SWELL.
.24 HOUR FORECAST WITHIN 30N118W TO 30N129W TO 26N132W TO 
24N129W TO 25N124W TO 30N118W WINDS 20 KT OR LESS. SEAS 2.5 TO 
3.0 M IN N SWELL.
.48 HOUR FORECAST WITHIN 30N119W TO 30N126W TO 27N123W TO 
27N122W TO 30N119W WINDS 20 KT OR LESS. SEAS 2.5 M IN NW TO N 
SWELL.

.WITHIN 02N109W TO 01N113W TO 06N128W TO 03N131W TO 03.4S120W TO
03.4S91W TO 02N109W...EXCEPT LEE OF GALAPAGOS ISLANDS...WINDS 20
KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL.
.24 HOUR FORECAST WITHIN 01N99W TO 02N108W TO 08N103W TO 00N127W
TO 03.4S120W TO 03.4S92W TO 01N99W...EXCEPT LEE OF GALAPAGOS 
ISLANDS...WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW 
SWELL.
.48 HOUR FORECAST WITHIN 07N108W TO 14N113W TO 08N120W TO 
06N130W TO 03.4S120W TO 03.4S90W TO 07N108W...EXCEPT LEE OF 
GALAPAGOS ISLANDS...WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S 
TO SW SWELL.

.48 HOUR FORECAST WITHIN 11.5N86W TO 12N87W TO 12N87.5W TO
11.5N88W TO 11N87.5W TO 11N86W TO 11.5N86W...INCLUDING THE GULF
OF PAPAGAYO...E WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

CONVECTION VALID AT 0600 UTC WED MAY 21...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 10N86W TO 08N118W. ITCZ FROM 08N118W TO 
BEYOND 04N140W. SCATTERED MODERATE FROM 06N TO 10N E OF 86W...AND
FROM 04N TO 08N W OF 123W. 

$$
.FORECASTER ADAMS. NATIONAL HURRICANE CENTER.