940
FZPN01 KWBC 171534
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1630 UTC SUN AUG 17 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 1200 UTC AUG 17.
24 HOUR FORECAST VALID 1200 UTC AUG 18.
48 HOUR FORECAST VALID 1200 UTC AUG 19.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.LOW 57N143W 1002 MB MOVING S 20 KT. BETWEEN 180 NM AND 480 NM W
QUADRANT...ALSO WITHIN 600 NM SW QUADRANT WINDS 20 TO 30 KT.
SEAS 2 TO 3.5 M.
.24 HOUR FORECAST LOW 49N133W 1009 MB. CONDITIONS DIMINISHED.

.24 HOUR FORECAST LOW NW OF AREA 53N159E 1002 MB. N OF 50N
BETWEEN 169E AND 164E WINDS TO 25 KT. SEAS LESS THAN 2.5 M.
.48 HOUR FORECAST LOW NW OF AREA 58N165E 1005 MB. N OF 52N
BETWEEN 176E AND 171E WINDS TO 25 KT. SEAS LESS THAN 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 44N TO 55N
BETWEEN 162W AND 174E...ALSO BETWEEN 43N AND 46N W OF 161E.
.24 HOUR FORECAST DENSE FOG FROM 47N TO 55N BETWEEN 158W AND
179W...AND N OF 44N W OF 166E.
.48 HOUR FORECAST DENSE FOG FROM 46N TO 50N BETWEEN 151W AND
158W...AND N OF 44N BETWEEN 172E AND 166E.

.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 SUN AUG 17.
24 HOUR FORECAST VALID 1200 UTC MON AUG 18.
48 HOUR FORECAST VALID 1200 UTC TUE AUG 19.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WITHIN 09N134W TO 09N140W TO 04N140W TO 05N135W TO 06N133W TO
09N134W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE SWELL.
.18 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS
LESS THAN 2.5 M.

.WITHIN 02S101W TO 00N114W TO 00N120W TO 03.4S120W TO 03.4S101W
TO 02S101W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW
SWELL.
.24 HOUR FORECAST WITHIN 00N99W TO 01S115W TO 03.4S120W TO
03.4S95W TO 00N99W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE
TO S SWELL.
.48 HOUR FORECAST WITHIN 01S103W TO 00N114W TO 01S120W TO
03.4S120W TO 03.4S98W TO 01S103W WINDS 20 KT OR LESS. SEAS 2.5
TO 3.0 M IN SE TO S SWELL.

.30 HOUR FORECAST WITHIN 08N110W TO 05N115W TO 03N114W TO
03N113W TO 04N110W TO 08N110W WINDS 20 KT OR LESS. SEAS 2.5 TO
3.0 M IN S TO SW SWELL.
.48 HOUR FORECAST WITHIN 08N109W TO 08N112W TO 07N113W TO
05N113W TO 03N112W TO 04N110W TO 08N109W WINDS 20 KT OR LESS.
SEAS 2.5 TO 3.0 M IN S SWELL.

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

CONVECTION VALID AT 1430 UTC SUN AUG 17...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N84W TO 10N107W TO 14N118W TO 13N126W. ITCZ
FROM 13N126W TO 10N140W. SCATTERED MODERATE ISOLATED STRONG
FROM 04N TO 10N BETWEEN 80W AND 110W...FROM 06N TO 13N BETWEEN
112W AND 119W...AND FROM 10N TO 15N BETWEEN 123W AND 140W.

$$
.FORECASTER AL. NATIONAL HURRICANE CENTER.