North Pacific High Seas Forecast

FZPN01 KWBC 100940
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1030 UTC SUN AUG 10 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS 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 10. 
24 HOUR FORECAST VALID 0600 UTC AUG 11.
48 HOUR FORECAST VALID 0600 UTC AUG 12.

.WARNINGS.

...TROPICAL STORM HENRIETTE...
.24 HOUR FORECAST TROPICAL STORM HENRIETTE NEAR 27.2N 154.2W.
MAXIMUM SUSTAINED WINDS 50 KT GUSTS 60 KT. TROPICAL STORM FORCE
WINDS WITHIN 60 NM NE QUADRANT...30 NM SE QUADRANT...20 NM SW
QUADRANT...AND 40 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 150
NM NE...120 NM SE...90 NM SW...AND 90 NM NW QUADRANTS WITH SEAS
TO 7 M. ELSEWHERE WITHIN 300 NM N QUADRANT WINDS 20 TO 33 KT.
SEAS TO 2.5 M.
.48 HOUR FORECAST TROPICAL STORM HENRIETTE NEAR 31.4N 159.4W.
MAXIMUM SUSTAINED WINDS 55 KT GUSTS 65 KT. TROPICAL STORM FORCE
WINDS WITHIN 70 NM NE QUADRANT...60 NM SE QUADRANT...30 NM SW
QUADRANT...AND 50 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 180
NM NE...120 NM SE...90 NM SW AND 60 NM NW QUADRANTS WITH SEAS TO
7.5 M. ELSEWHERE S OF 35N BETWEEN 155W AND 162W WINDS 20 TO 33
KT. SEAS TO 4 M.

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

...GALE WARNING...
.LOW 37N124W 1012 MB MOVING SW 05 KT. WITHIN 180 NM EITHER SIDE
OF A LINE FROM 36N133W TO 48N125W WINDS 25 TO 35 KT. SEAS 2.5 TO
4 M.
.24 HOUR FORECAST LOW NEAR 35N130W 1016 MB. WITHIN 180 NM EITHER
SIDE OF A LINE FROM 35N140W TO 42N130W TO 50N126W WINDS 25 TO 35
KT. SEAS 2.5 TO 3.5 M.
.30 HOUR FORECAST FROM 45N TO 51N BETWEEN 124W AND 131W AREA OF N
TO NW WINDS 25 TO 40 KT. SEAS 2.5 TO 4.5 M.
.48 HOUR FORECAST LOW 32N133W 1016 MB. WITHIN 240 NM EITHER SIDE
OF A LINE FROM 35N145W TO 42N130W TO 51N127W WINDS 25 TO 35 KT.
SEAS 2.5 TO 4.5 M.

...GALE WARNING...
.COMPLEX LOW WITH MAIN CENTER 46N159W 1008 MB MOVING N 15 KT THEN
TURNING NE AFTER 06 HOURS. WITHIN 300 NM E AND 420 NM SE
QUADRANTS WINDS 25 TO 35 KT. SEAS 2.5 TO 4 M. ELSEWHERE FROM 30N
TO 49N BETWEEN 149W AND 177W WINDS TO 25 KT. SEAS 2.5 TO 3.5 M.
.24 HOUR FORECAST LOW 54N154W 1012 MB. WITHIN 480 NM E AND 240 NM
SE QUADRANTS WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE FROM
50N TO 57N BETWEEN 132W AND 144W WINDS TO 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST LOW DISSIPATED INLAND. FROM 51N TO 58N E OF
146W AREA OF W WINDS TO 25 KT. SEAS TO 2.5 M.

...GALE WARNING...
.LOW NW OF AREA 56N168E 998 MB MOVING NE 10 KT. WITHIN 360 NM E
AND 420 NM SE QUADRANTS WINDS 20 TO 30 KT. SEAS TO 2.5 M.
.06 HOUR FORECAST LOW NW OF AREA 57N170E 995 MB. BETWEEN 120 NM
AND 300 NM E AND SE QUADRANTS WINDS 25 TO 35 KT. SEAS 2.5 TO 3.5
M.
.24 HOUR FORECAST LOW NW OF AREA 59N175E 990 MB. FROM 47N TO 61N
BETWEEN 168W AND 180W AND WITHIN 240 NM SE SEMICIRCLE WINDS 25 TO
35 KT. SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER 61N178W 996 MB AND
NEW SECOND CENTER 52N174W 1001 MB. WITHIN 300 NM SE QUADRANT OF
SECOND CENTER WINDS 25 TO 35 KT. SEAS 2.5 TO 4 M. ELSEWHERE
WITHIN 180 NM EITHER SIDE OF A LINE FROM 40N160E TO 47N170W TO
67N165W WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M IN MIXED SWELL.

.SYNOPSIS AND FORECAST.

.LOW 58N141W 1002 MB MOVING NE 15 KT. WITHIN 480 NM S SEMICIRCLE
WINDS 20 TO 30 KT. SEAS 2.5 TO 4.5 M. ELSEWHERE FROM 48N TO 59N
BETWEEN 132W AND 150W WINDS TO 25 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW DISSIPATED INLAND AND ASSOCIATED CONDITIONS
DIMINISHED.

.COMPLEX LOW INLAND WITH MAIN CENTER 67N161W 1000 MB MOVING E 10
KT. WITHIN 300 NM SW SEMICIRCLE WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW WELL INLAND AND ASSOCIATED CONDITIONS
DIMINISHED.

.24 HOUR FORECAST LOW 47N161E 1004 MB. WITHIN 300 NM SE QUADRANT
WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST LOW AND CONDITIONS DESCRIBED WITH LOW 61N178W
IN WARNINGS SECTION ABOVE.

.24 HOUR FORECAST NEW LOW NEAR 41N162W 1012 MB. WITHIN 180 NM E
AND 240 NM SE QUADRANTS WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST LOW NEAR 48N162W 1020 MB. WITHIN 240 NM E OF A
FRONT FROM LOW CENTER TO 30N170W WINDS 20 TO 30 KT. SEAS TO 3 M.

.KLYUCHEVSKOY VOLCANO 56.03N 160.38E CONTINUES TO ERUPT. VOLCANIC
ASH MAY BE REACHING THE SURFACE WITHIN 60 NM OF A LINE WITHIN 60
NM OF A LINE 
FROM 55N170E TO 52N177E TO 45N179E. 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 301-683-1520.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 180 NM SE OF
A LINE FROM 52N147W TO 45N160W...AND FROM 40N TO 55N W OF 172E.
.24 HOUR FORECAST DENSE FOG WITHIN 300 NM SE OF A LINE FROM
57N144W TO 50N158W TO 44N160W...AND N AND W OF A LINE FROM
42N160E TO 40N173E TO 50N175W TO 61N177W.
.48 HOUR FORECAST DENSE FOG WITHIN 360 NM SE OF A LINE FROM
56N135W TO 50N164W...AND N AND W OF A LINE FROM 41N160E TO
42N175W TO 65N168W.

.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 SUN AUG 10.
24 HOUR FORECAST VALID 0600 UTC MON AUG 11.
48 HOUR FORECAST VALID 0600 UTC TUE AUG 12.

.WARNINGS.

...TROPICAL STORM WARNING...
.TROPICAL STORM IVO NEAR 21.5N 114.9W 1006 MB AT 0900 UTC AUG 10 
MOVING WNW OR 285 DEG AT 07 KT. MAXIMUM SUSTAINED WINDS 35 KT
GUSTS 
45 KT. TROPICAL STORM FORCE WINDS WITHIN 40 NM E SEMICIRCLE...20
NM 
SW QUADRANT AND 30 NM NW QUADRANT. SEAS 4 M OR GREATER WITHIN 30
NM 
OF CENTER EXCEPT 0 NM SW QUADRANT WITH SEAS TO 4.5 M. ELSEWHERE 
WITHIN 60 NM OF CENTER...EXCEPT 90 NM NE QUADRANT WINDS 20 TO 33
KT. 
SEAS 2.5 TO 4 M.  
.12 HOUR FORECAST TROPICAL DEPRESSION IVO NEAR 22.0N 116.3W.
MAXIMUM SUSTAINED WINDS 30 KT WITH GUSTS TO 40 KT NEAR CENTER. 
WITHIN 60 NM N SEMICIRCLE OF CENTER WINDS 20 TO 30 KT SEAS
2.5 TO 4 M.
.24 HOUR FORECAST POST-TROPICAL REMNANT LOW IVO NEAR 22.7N
118.3W. 
WITHIN 60 NM NW QUADRANT WINDS 20 TO 25 KT WITH GUSTS TO 35 KT.
SEAS 2.5 TO 3.5 M.
.48 HOUR FORECAST POST-TROPICAL REMNANT LOW IVO NEAR 23.1N
122.9W. 
WITHIN 60 NM NW QUADRANT WINDS 20 TO 25 KT WITH GUSTS TO 30 KT.
SEAS LESS THAN 2.5 M.

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.

.S OF 11N BETWEEN 114W AND 130W WINDS 20 KT OR LESS. SEAS 2.5 TO
3 M 
IN S TO SW SWELL.
.24 HOUR FORECAST S OF 08N BETWEEN 127W AND 132W WINDS 20 KT OR 
LESS. SEAS TO 2.5 M IN DECAYING S TO SW SWELL.
.42 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

.18 HOUR FORECAST N OF 29N BETWEEN 133W AND 140W WINDS 20 KT OR 
LESS. SEAS TO 2.5 M IN NE SWELL.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.

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

CONVECTION VALID AT 0830 UTC SUN AUG 10...

.TROPICAL STORM IVO...NUMEROUS MODERATE ISOLATED STRONG WITHIN
30 NM N SEMICIRCLE AND 60 NM S SEMICIRCLE.

.TROPICAL WAVE ALONG 130W FROM 03N TO 16N...SCATTERED MODERATE
FROM 10N TO 14N BETWEEN 127W AND 130W.

.SCATTERED MODERATE WITHIN 30 NM OF A LINE FROM 15N114W TO
14N117W 
TO 14N120W AND WITHIN 60 NM OF 13N90W.

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS EXTENDS FROM 10N85W TO 10N89W TO 08N92W TO 
09N97W TO 09N103W TO 12N109W. IT RESUMES SW OF IVO AT 14N121W TO 
09N130W TO 07N136W TO 07N140W. SCATTERED MODERATE ISOLATED STRONG

FROM 06N TO 09N BETWEEN 81W AND 86W...WITHIN 180 NM S OF THE
TROUGH 
BETWEEN 107W AND 109W. SCATTERED MODERATE WITHIN 120 NM S OF THE 
TROUGH BETWEEN 121W AND 123W...FROM 09N TO 10N BETWEEN 130W AND 
140W...WITHIN 60 NM N OF THE TROUGH BETWEEN 125W AND 127W AND
WITHIN 
30 NM S OF THE TROUGH BETWEEN 84W AND 88W.

.FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.

$$