North Pacific High Seas Forecast

FZPN01 KWBC 312217
HSFEP1

HIGH SEAS FORECAST 
NWS OCEAN PREDICTION CENTER WASHINGTON DC 
2230 UTC SAT MAY 31 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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 1800 UTC MAY 31. 
24 HOUR FORECAST VALID 1800 UTC JUN 01. 
48 HOUR FORECAST VALID 1800 UTC JUN 02. 

.WARNINGS. 

...GALE WARNING....
.S OF 40N BETWEEN 123W AND 130W WINDS TO 25 KT. SEAS TO 3 M. 
.06 HOUR FORECAST WITHIN 90 NM OF THE CALIFORNIA AND OREGON 
COAST FROM 38N TO 43N WINDS 30 TO 40 KT. SEAS TO 4 M. 
.24 HOUR FORECAST FROM 37N TO 43N BETWEEN 124 AND 128W WINDS 30 
TO 40 KT. SEAS 4 TO 5.5 M. ELSEWHERE S OF 49N BETWEEN 121W AND 
135W WINDS 20 TO 30 KT. SEAS TO 4 M. 
.48 HOUR FORECAST NEW LOW 36N124W 1011 MB. FROM 38N TO 43N 
BETWEEN 125W AND 128W WINDS 35 TO 45 KT. SEAS 5 TO 6.5 M. 
ELSEWHERE FROM 33N TO 50N BETWEEN 124W AND 133W WINDS 25 TO 35 
KT. SEAS 3 TO 5.5 M. ELSEWHERE S OF 51N BETWEEN 119W AND 138W 
WINDS TO 25 KT. SEAS 2.5 TO 4.5 M. 

...GALE WARNING...
.LOW 51N168W 981 MB MOVING NW 15 KT. WITHIN 300 NM E OF A LINE 
FROM 53N167W TO 45N167W TO 37N173W WINDS 25 TO 40 KT. SEAS 3 TO 
4.5 M. ELSEWHERE FROM 34N TO ALEUTIAN ISLANDS BETWEEN 156W AND 
172E WINDS TO 25 KT. SEAS TO 4 M. 
.24 HOUR FORECAST LOW 56N171W 974 MB. WITHIN 300 NM N AND E OF A 
LINE FROM 46N153W TO 54N153W TO 56N159W TO 56N176E WINDS 30 TO 
40 KT. SEAS 3 TO 4.5 M. ELSEWHERE FROM 36N TO 63N BETWEEN 144W 
AND 168E WINDS 25 TO 35 KT. SEAS 2.5 TO 4.5 M. 
.48 HOUR FORECAST COMPLEX LOW WITH FIRST CENTER 53N171W 989 MB 
AND SECOND CENTER 55N166W 989 MB. WITHIN 240 NM S SEMICIRCLE OF 
FIRST CENTER...AND WITHIN 360 NM E SEMICIRCLE OF SECOND CENTER 
WINDS 25 TO 35 KT. SEAS 4 TO 5.5 M. ELSEWHERE FROM 40N TO 61N 
BETWEEN 139W AND 169E WINDS TO 25 KT. SEAS TO 4 M. 

...GALE WARNING...
.LOW 60N177W 988 MB MOVING SW 15 KT. N OF 55N BETWEEN 179W AND 
177E WINDS 25 TO 35 KT. SEAS 3.5 TO 4.5 M. ELSEWHERE FROM 53N TO 
63N BETWEEN 167W AND 173E WINDS TO 25 KT. SEAS TO 4 M. 
.24 HOUR FORECAST LOW DISSIPATED AND CONDITIONS MERGED WITH LOW 
56N171W DESCRIBED ABOVE. 

.SYNOPSIS AND FORECAST. 

.LOW 56N134W 1015 MB MOVING SE 15 KT. FROM 51N TO 56N BETWEEN 
131W AND 136W WINDS LESS THAN 20 KT. SEAS 2.5 TO 3.5 M. 
.24 HOUR FORECAST LOW DISSIPATED INLAND AND CONDITIONS 
DIMINISHED. 

.48 HOUR FORECAST NEW LOW 43N177E 1004 MB. FROM 37N TO 44N 
BETWEEN 179W AND 178E WINDS TO 25 KT. SEAS TO 3 M. 

.48 HOUR FORECAST LOW W OF AREA 45N154E 994 MB. FROM 32N TO 43N 
W OF 167E WINDS LESS THAN 25 KT. SEAS TO 3 M. 

.DENSE FOG VSBY OCCASIONALLY LESS THAN 1 NM FROM 45N TO 52N 
BETWEEN 166W AND 169W...AND N OF 57N BETWEEN 177W AND 180W.  
.24 HOUR FORECAST DENSE FOG FROM 38N TO 46N W OF 167E...AND FROM 
54N TO 59N BETWEEN 170W AND 176E.... 
.48 HOUR FORECAST DENSE FOG FROM 37N TO 45N BETWEEN 178E AND 
165E...AND FROM 50N TO 53N BETWEEN 165W AND 170W...AND WITHIN 90 
NM SE OF A LINE FROM 49N148W TO 42N156W.  

.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 1800 UTC SAT MAY 31.
24 HOUR FORECAST VALID 1800 UTC SUN JUN  1.
48 HOUR FORECAST VALID 1800 UTC MON JUN  2.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.REMNANT LOW ALVIN NEAR 21.2N 109.8W. WITHIN 22N108W TO 22N109W 
TO 21N109W TO 20N110W TO 20N109W TO 20N108W TO 22N108W S WINDS 20
TO 30 KT. SEAS 3 TO 4 M IN S SWELL. ELSEWHERE WITHIN 21N107W TO 
23N108W TO 23N111W TO 21N112W TO 18N110W TO 18N108W TO 21N107W 
WINDS 20 KT OR LESS. SEAS 3 TO 3.5 M IN S SWELL.
.24 HOUR FORECAST..REMNANT LOW ALVIN DISSIPATED...WITHIN 24N108W
TO 24N109W TO 23N108W TO 24N108W...INCLUDING THE GULF OF 
CALIFORNIA...WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW 
SWELL.
.30 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
2.5 TO 3.0 M IN S TO SW SWELL.

.WITHIN 16N106W TO 11N124W TO 03.4S120W TO 03.4S84W TO
16N106W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL.
.24 HOUR FORECAST WITHIN 14N94W TO 19N116W TO 09N115W TO 01S105W
TO 01S97W TO 07N89W TO 14N94W WINDS 20 KT OR LESS. SEAS 2.5 TO 
3.0 M IN S TO SW SWELL.
.48 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
2.5 TO 3.0 M IN S TO SW SWELL.

.WITHIN 30N126W TO 30N132W TO 27N134W TO 24N134W TO 27N127W TO 
30N126W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN NW SWELL.
.24 HOUR FORECAST WITHIN 30N124W TO 30N140W TO 22N140W TO 
24N137W TO 25N131W TO 30N124W WINDS 20 KT OR LESS. SEAS 2.5 TO 
3.0 M IN NE SWELL. 
.48 HOUR FORECAST WITHIN 30N119W TO 30N140W TO 23N140W TO 
25N129W TO 30N119W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN NE 
SWELL.

.WITHIN 17N137W TO 22N140W TO 09N140W TO 10N137W TO 14N139W TO
17N137W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN NE SWELL.
.09 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS 
2.5 TO 3.0 M IN NE SWELL.

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

CONVECTION VALID AT 1800 UTC SAT MAY 31...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N84W TO 06N128W. ITCZ FROM 06N128W TO 
BEYOND 07N140W. NUMEROUS STRONG CONVECTION FROM 03N TO 11N AND 
EAST OF 91W. SCATTERED MODERATE TO ISOLATED STRONG FROM 03N TO 
10N BETWEEN 95W AND 105W.

$$
.FORECASTER ADAMS/DELGADO. NATIONAL HURRICANE CENTER.