North Pacific High Seas Forecast

FZPN01 KWBC 090944
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1030 UTC SAT AUG 09 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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).

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 AUG 09. 
24 HOUR FORECAST VALID 0600 UTC AUG 10.
48 HOUR FORECAST VALID 0600 UTC AUG 11.

.WARNINGS.

...GALE WARNING...
.LOW 52N155W 997 MB MOVING NE 20 KT. WITHIN 540 NM SE SEMICIRCLE
WINDS 25 TO 35 KT. SEAS 3 TO 5 M. ELSEWHERE WITHIN 420 NM EITHER
SIDE OF A LINE FROM 35N170W TO 55N140W WINDS TO 25 KT. SEAS 2.5
TO 4 M.
.24 HOUR FORECAST LOW 58N142W 1004 MB. WITHIN 480 NM S QUADRANT
WINDS 20 TO 30 KT. SEAS 3 TO 5 M. ELSEWHERE FROM 46N TO 59N
BETWEEN 133W AND 152W WINDS TO 25 KT. SEAS TO 3 M.
.48 HOUR FORECAST LOW DISSIPATED INLAND AND ASSOCIATED CONDITIONS
DESCRIBED WITH LOW 57N146W IN SYNOPSIS AND FORECAST SECTION
BELOW.

...GALE WARNING...
.FROM 34N TO 44N BETWEEN 124W AND 131W AREA OF N WINDS 20 TO 30
KT. SEAS 2.5 TO 4 M.
.06 HOUR FORECAST FROM 37N TO 43N BETWEEN 124W AND 129W AREA OF N
WINDS 25 TO 35 KT. SEAS 2.5 TO 4 M.
.24 HOUR FORECAST FROM 36N TO 43N BETWEEN 124W AND 133W AREA OF N
TO NW WINDS 25 TO 35 KT. SEAS 3 TO 4.5 M...HIGHEST NEAR 40N128W.
ELSEWHERE FROM 32N TO 50N BETWEEN 124W AND 134W AREA OF NW WINDS
TO 25 KT. SEAS TO 3 M.
.48 HOUR FORECAST FROM 42N TO 50N BETWEEN 126W AND 132W AREA OF N
TO NW WINDS 25 TO 35 KT. SEAS 2.5 TO 4 M. ELSEWHERE WITHIN 240 NM
EITHER SIDE OF A LINE FROM 32N142W TO 47N125W AREA OF N TO NE
WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M.

...GALE WARNING...
.FROM 47N TO 54N W OF 170E AREA OF SE WINDS TO 25 KT. SEAS TO 2.5
M. 
.24 HOUR FORECAST NEW LOW NW OF AREA NEAR 56N167E 1000 MB. N OF
47N BETWEEN 177E AND 169E WINDS 20 TO 30 KT. SEAS TO 3 M.
.30 HOUR FORECAST LOW NW OF AREA 57N163E 996 MB. WITHIN 360 NM SE
QUADRANT WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST LOW NW OF AREA 59N174E 990 MB. WITHIN 360 NM E
SEMICIRCLE WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE WITHIN
420 NM E AND 540 NM SE QUADRANTS WINDS TO 25 KT. SEAS TO 2.5 M.

...GALE WARNING...
.48 HOUR FORECAST NEW LOW NEAR 47N162E 1002 MB. WITHIN 300 NM SE
SEMICIRCLE WINDS 25 TO 35 KT. SEAS 2.5 TO 4 M.

.SYNOPSIS AND FORECAST.

.LOW 65N162W 999 MB MOVING SE 10 KT THEN DISSIPATING INLAND.
WITHIN 360 NM SW AND W QUADRANTS WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST CONDITIONS DIMINISHED.

.LOW 37N167W 1009 MB MOVING NE 20 KT. WITHIN 360 NM NE AND 240 NM
S QUADRANTS WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.24 HOUR FORECAST LOW 45N159W 1008 MB. WITHIN 300 NM E AND 420 NM
SE QUADRANTS WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M. 
.48 HOUR FORECAST LOW 57N146W 1015 MB. WITHIN 420 NM SE
SEMICIRCLE WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M. 

.24 HOUR FORECAST NEW LOW NEAR 34N165W 1008 MB. WITHIN 360 NM E
SEMICIRCLE WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST LOW 40N163W 1008 MB. WITHIN 240 NM E AND 360 NM
SE QUADRANTS WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.

.KLYUCHEVSKOY VOLCANO 56.03N 160.38E CONTINUES TO ERUPT. VOLCANIC
ASH MAY BE REACHING THE SURFACE WITHIN 60 NM OF A LINE FROM
55N171E TO 51N177E TO 45N178E. MARINERS SHOULD EXERCISE CAUTION.
IF MARINERS ENCOUNTER VOLCANIC ASH OR FLOATING VOLCANIC DEBRIS
YOU ARE ENCOURAGED TO REPORT THE OBSERVATION TO THE OCEAN
PREDICTION CENTER BY CALLING 301-683-1320. 

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 45N TO 55N
BETWEEN 135W AND 161W...FROM 40N TO 54N W OF 171E...AND FROM 30N
TO 38N BETWEEN 118W AND 128W.
.24 HOUR FORECAST DENSE FOG WITHIN 240 NM SE OF A LINE FROM
52N147W TO 48N160W TO 40N160W...N OF 64N W OF ALASKA...AND N OF
40N W OF 176E.
.48 HOUR FORECAST DENSE FOG WITHIN 180 NM SE OF A LINE FROM
58N140W TO 55N150W TO 46N160W...AND N OF 41N W OF 177W.

.FORECASTER ANDERSON. OCEAN PREDICTION CENTER.

NWS 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 SAT AUG 09.
24 HOUR FORECAST VALID 0600 UTC SUN AUG 10.
48 HOUR FORECAST VALID 0600 UTC MON AUG 11.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM IVO NEAR 20.6N 112.4W 1001 MB AT 0900 UTC AUG 09 
MOVING W OR 280 DEG AT 8 KT. MAXIMUM SUSTAINED WINDS 50 KT GUSTS
60 
KT. TROPICAL STORM FORCE WINDS WITHIN 30 NM OF CENTER EXCEPT 20
NM 
SW QUADRANT. SEAS 4 M OR GREATER WITHIN 60 NM N SEMICIRCLE AND 30
NM 
S SEMICIRCLE WITH SEAS TO 5.5 M. ELSEWHERE WITHIN 90 NM OF
CENTER... 
EXCEPT 120 NM E QUADRANT 20 TO 33 KT. SEAS 2.5 TO 4 M. REMAINDER
OF 
AREA FROM 19N TO 23N BETWEEN 109W AND 114W WINDS 20 KT OR LESS.
SEAS 
2.5 TO 3 M IN MIXED SE AND SW SWELL.
.24 HOUR FORECAST TROPICAL STORM IVO NEAR 21.3N 115.1W. MAXIMUM 
SUSTAINED WINDS 45 KT GUSTS 55 KT. TROPICAL STORM FORCE WINDS
WITHIN 
30 NM N SEMICIRCLE AND 20 NM S SEMICIRCLE. LITTLE CHANGE IN
RADIUS 
OF SEAS 4 M OR GREATER WITH TO SEAS TO 5 M. ELSEWHERE WITHIN 90
NM N 
SEMICIRCLE AND 60 NM SEMICIRCLE WINDS 20 TO 33 KT. SEAS 2.5 TO 4
M. 
REMAINDER OF AREA FROM 20N TO 23N BETWEEN 112W AND 117W WINDS 20
KT 
OR LESS. SEAS 2.5 TO 3 M IN MIXED SE AND SW SWELL.
.48 HOUR FORECAST POST-TROPICAL IVO NEAR 22.0N 119.3W. MAXIMUM 
SUSTAINED WINDS 35 KT GUSTS 45 KT. TROPICAL STORM FORCE WINDS
WITHIN 
20 NM N SEMICIRCLE AND 0 NM S SEMICIRCLE. SEAS TO 4 M WITHIN 30
NM 
OF CENTER. ELSEWHERE WITHIN 60 NM OF CENTER...EXCEPT 90 NM NE 
QUADRANT WINDS 20 TO 33 KT. SEAS 2.5 TO 3.5 M. REMAINDER OF AREA 
FROM 21N TO 24N BETWEEN 118W AND 120W WINDS 20 KT OR LESS. SEAS
2.5 
TO 3 M IN MIXED SE AND SW SWELL.

FORECAST WINDS IN AND NEAR ACTIVE TROPICAL CYCLONES SHOULD BE
USED WITH CAUTION DUE TO UNCERTAINTY IN FORECAST TRACK...SIZE
AND INTENSITY.

.SYNOPSIS AND FORECAST.

.N OF 29N BETWEEN 112W AND 114W...INCLUDING THE NORTHERN GULF 
OF CALIFORNIA...SE TO S WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M. 
.15 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

.FROM 19N TO 23N W OF 139W WINDS 20 KT OR LESS. SEAS TO 2.5 M
IN NE SWELL.
.06 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

.S OF 09N BETWEEN 117W AND 126W WINDS 20 KT OR LESS. SEAS 2.5 TO
3 M 
IN S TO SW SWELL.
.12 HOUR FORECAST S OF 10N BETWEEN 118W AND 130W WINDS 20 KT OR 
LESS. SEAS 2.5 M IN S TO SW SWELL.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST S OF 06N BETWEEN 128W AND 132W WINDS 20 KT OR 
LESS. SEAS TO 2.5 M IN DECAYING S TO SW SWELL.

.S OF 02S BETWEEN 110W AND 117W WINDS 20 KT OR LESS. SEAS 2.5 M
IN S 
TO SW SWELL.
.12 HOUR FORECAST CONDITIONS TO MERGE WITH AREA OF S TO SW SWELL 
DESCRIBED ABOVE. 

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

CONVECTION VALID AT 0845 UTC SAT AUG 09...

.TROPICAL STORM IVO...NUMEROUS MODERATE TO STRONG WITHIN 60 NM 
SW QUADRANT. NUMEROUS MODERATE ELSEWHERE WITHIN 120 NM SW
QUADRANT 
AND WITHIN 60 NM SE QUADRANT. SCATTERED MODERATE WITHIN 30 NM OF 
A LINE FROM 20N109W TO 22N109W.

.SCATTERED MODERATE FROM 15N TO 16N BETWEEN 94W AND 95W... 
WITHIN 60 NM OF 12N87W AND WITHIN 60 NM OF 06N78W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS EXTENDS FROM 09N84W TO 09N90W TO 08N100W TO 
12N110W TO 12N120W TO 08N130W TO 13N140W. SCATTERED MODERATE
WITHIN 
120 NM S OF TROUGH BETWEEN 112W AND 115W...FROM 12N TO 16N W OF 
138W...ALSO WITHIN 60 NM N OF TROUGH BETWEEN 125W AND 127W AND 
WITHIN 30 NM OF TROUGH BETWEEN 98W AND 105W.

.FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.

$$