East and Central North Pacific High Seas Forecast

FZPN02 KWBC 161725
HSFEPI

HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1745 UTC SAT AUG 16 2025 

CCODE/1:31:12:01:00/AOW+POR/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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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). 

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 1200 UTC AUG 16. 
24 HOUR FORECAST VALID 1200 UTC AUG 17. 
48 HOUR FORECAST VALID 1200 UTC AUG 18. 

.WARNINGS. 

...GALE WARNING... 
.LOW 59N144W 996 MB MOVING SE 10 KT. WITHIN 420 NM SW QUADRANT 
WINDS 25 TO 40 KT. SEAS 2.5 TO 4 M. ELSEWHERE WITHIN 600 NM SW 
QUADRANT WINDS 20 TO 30 KT. SEAS TO 3 M. 
.24 HOUR FORECAST LOW 55N142W 1001 MB. FROM 52N TO 59N BETWEEN 
150W AND 157W...ALSO BETWEEN 180 NM AND 600 NM SW QUADRANT WINDS 
20 TO 30 KT. SEAS TO 3 M. 
.48 HOUR FORECAST LOW 50N140W 1008 MB. CONDITIONS DIMINISHED. 

...GALE WARNING...
.LOW 54N133W 991 MB MOVING NW 10 KT. WITHIN 240 NM SW SEMICIRCLE 
WINDS 25 TO 35 KT. SEAS 2.5 TO 4.5 M. ELSEWHERE FROM 46N TO 54N 
BETWEEN 128W AND 144W WINDS 20 TO 30 KT. SEAS TO 3 M. 
.24 HOUR FORECAST LOW 56N139W 1001 MB. WITHIN 120 NM NE QUADRANT 
WINDS 25 TO 35 KT. SEAS TO 3 M.
.48 HOUR FORECAST MERGED WITH LOW 50N140W. 

.SYNOPSIS AND FORECAST. 

.LOW 40N174E 1012 MB MOVING N 15 KT. FROM 37N TO 44N BETWEEN 
177W AND 176E WINDS 20 TO 30 KT. SEAS TO 3 M. 
.24 HOUR FORECAST LOW 48N175E 1016 MB. CONDITIONS DIMINISHED. 

.FROM 33N TO 39N BETWEEN 121W AND 124W WINDS TO 25 KT. SEAS TO 
2.5 M. 
.24 HOUR FORECAST CONDITIONS DIMINISHED. 

.48 HOUR FORECAST N OF 50N BETWEEN 164E AND 168E WINDS TO 25 KT. 
SEAS TO 2.5 M. 

.KLYUCHEVSKOY VOLCANO 56.03N 160.38E HAS ERUPTED. VOLCANIC ASH 
MAY BE REACHING THE SURFACE. MARINERS SHOULD EXERCISE CAUTION. 
IF MARINERS ENCOUNTER VOLCANIC ASH OR FLOATING VOLCANIC DEBRIS 
IN AND NEAR VICINITY YOU ARE ENCOURAGED TO REPORT THE 
OBSERVATION TO THE OCEAN PREDICTION CENTER BY CALLING 
301-683-1520. 

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 42N TO 55N 
BETWEEN 166W AND 172E. 
.24 HOUR FORECAST DENSE FOG FROM 45N TO 54N BETWEEN 162W AND 
173E. 
.48 HOUR FORECAST DENSE FOG FROM 46N TO 54N BETWEEN 158W AND 
180W...AND N OF 44N W OF 167E. 

.FORECASTER SHAW. 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 1200 UTC SAT AUG 16.
24 HOUR FORECAST VALID 1200 UTC SUN AUG 17.
48 HOUR FORECAST VALID 1200 UTC MON AUG 18.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WITHIN 07N131W TO 07N134W TO 05N135W TO 04N133W TO 04N132W TO
05N131W TO 07N131W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE
SWELL.
.24 HOUR FORECAST WITHIN 08N134W TO 08N140W TO 04N140W TO
05N135W TO 08N134W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE
SWELL.
.42 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS
2.5 TO 3.0 M IN SE SWELL.

.WITHIN 02S113W TO 01S120W TO 03.4S120W TO 03.4S113W TO 02S113W
WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST WITHIN 03S97W TO 01S105W TO 03S116W TO
03.4S117W TO 03.4S96W TO 03S97W WINDS 20 KT OR LESS. SEAS 2.5 TO
3.0 M IN SE TO S SWELL.

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

CONVECTION VALID AT 1500 UTC SAT AUG 16...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 08N82W TO 10N92W TO 07N103W TO 11N110W...THEN
RESUMES NEAR 17N112W TO 11N127W. ITCZ FROM 11N127W TO BEYOND 
09N140W. SCATTERED MODERATE TO ISOLATED STRONG WITHIN 200 NM ON 
EITHER SIDE OF THE BOUNDARIES W OF 107W.

$$
.FORECASTER ERA. NATIONAL HURRICANE CENTER.

NATIONAL WEATHER SERVICE HONOLULU HI

NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 1200 UTC AUG 16 2025.
24 HOUR FORECAST VALID 1200 UTC AUG 17 2025.
48 HOUR FORECAST VALID 1200 UTC AUG 18 2025.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.TROUGH 30N178E 26N176E NEARLY STATIONARY.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST WEAK TROUGH 30N176E 27N175E.

.TROUGH 26N167E 22N164E MOVING NW 10 KT. ISOLATED MODERATE TSTMS
WITHIN 240 NM OF TROUGH.
.24 HOUR FORECAST TROUGH 27N165E 23N161E.
.48 HOUR FORECAST TROUGH 29N163E 24N160E.

.TROUGH 11N168E 06N165E MOVING W 15 KT. SCATTERED MODERATE TSTMS
WITHIN 210 NM OF TROUGH.
.24 HOUR FORECAST TROUGH MOVED W OF AREA.

.WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.

.SEAS 2.5 M OR LOWER REMAINDER OF FORECAST AREA.

.ITCZ 09N140W 08N178W 04N164E 05N160E. NUMEROUS MODERATE TSTMS
WITHIN 240 NM N OF ITCZ BETWEEN 170W AND 172E. ELSEWHERE ISOLATE
MODERATE TSTMS WITHIN 270 NM OF ITCZ.

.ISOLATED MODERATE TSTMS WITHIN 60 NM OF A POINT 26N165W.

$$

.FORECASTER ALMANZA. HONOLULU HI.