421
FZPN01 KWBC 210416
HSFEP1

HIGH SEAS FORECAST
NWS OCEAN PREDICTION CENTER WASHINGTON DC
0430 UTC THU AUG 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC AUG 21.
24 HOUR FORECAST VALID 0000 UTC AUG 22.
48 HOUR FORECAST VALID 0000 UTC AUG 23.

.WARNINGS.

...GALE WARNING...
.LOW 51N148W 1003 MB MOVING SE 05 KT. WITHIN 120 NM N AND E OF A
FRONT FROM LOW CENTER TO 53N145W TO 52N142W TO 47N141W WINDS 25
TO 35 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE 37N TO 56N BETWEEN 135W
AND 160W WINDS TO 25 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER 50N146W 1007 MB.
WITHIN 240 NM S AND 360 NM SW QUADRANTS...BETWEEN 180 NM AND 480
NM NW QUADRANT...AND BETWEEN 300 NM AND 540 NM NE QUADRANT WINDS
20 TO 30 KT. SEAS 2.5 TO 3.5 M. ELSEWHERE FROM 42N TO 58N BETWEEN
131W AND 156W WINDS TO 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER 52N144W 1010 MB.
BETWEEN 180 NM AND 360 NM N SEMICIRCLE WINDS 20 TO 30 KT. SEAS TO
3 M. ELSEWHERE FROM 44N TO 58N BETWEEN 133W AND 155W WINDS TO 25
KT. SEAS TO 2.5 M.

...GALE WARNING...
.12 HOUR FORECAST LOW JUST W OF AREA 47N159E 996 MB. WITHIN 420
NM NE QUADRANT AND 300 NM SE SEMICIRCLE WINDS 25 TO 35 KT. SEAS
2.5 TO 3.5 M.
.24 HOUR FORECAST LOW NW OF AREA 53N163E 990 MB. WITHIN 240 NM SE
SEMICIRCLE WINDS 25 TO 40 KT. SEAS 3 TO 5 M. ELSEWHERE WITHIN 360
NM E...480 NM SE...AND 600 NM S QUADRANTS WINDS TO 25 KT. SEAS
2.5 TO 4 M.
.48 HOUR FORECAST LOW NW OF AREA 62N175E 996 MB. WITHIN 300 NM SE
SEMICIRCLE WINDS 25 TO 35 KT. SEAS 3 TO 5 M. ELSEWHERE WITHIN 600
NM E QUADRANT AND 360 NM SE SEMICIRCLE WINDS 20 TO 30 KT. SEAS
2.5 TO 3.5 M.

.SYNOPSIS AND FORECAST.

.LOW NW OF AREA 66N178W 1003 MB MOVING NE 15 KT. WITHIN 480 NM SE
SEMICIRCLE WINDS 20 TO 30 KT. SEAS TO 3 M.
.24 HOUR FORECAST LOW WELL N OF AREA AND ASSOCIATED CONDITIONS
DIMINISHED.

.S OF 43N BETWEEN 120W AND 126W AREA OF N TO NW WINDS 20 TO 30
KT. SEAS TO 2.5 M.
.24 HOUR FORECAST FROM S OF 46N BETWEEN 121W AND 128W AREA OF N
TO NW WINDS 20 TO 30 KT. SEAS TO 3 M.
.48 HOUR FORECAST FROM S OF 47N BETWEEN 122W AND 129W AREA OF N
TO NW WINDS 20 TO 30 KT. SEAS TO 2.5 M.

.48 HOUR FORECAST NEW LOW NEAR 49N168E 1010 MB. WITHIN 480 NM NE
AND 360 NM SE QUADRANTS WINDS 20 TO 30 KT. SEAS 2.5 TO 3.5 M.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM FROM 47N TO 54N
BETWEEN 138W AND 150W...AND FROM 42N TO 54N W OF 175W.
.24 HOUR FORECAST DENSE FOG FROM 50N TO 56N BETWEEN 135W AND
150W...AND FROM 42N TO 59N W OF 165W.
.48 HOUR FORECAST DENSE FOG FROM 52N TO 56N BETWEEN 133W AND
139W...AND N AND W OF A LINE FROM 40N160E TO 48N180W TO 46N165W
TO 65N165W.

.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 0000 UTC THU AUG 21.
24 HOUR FORECAST VALID 0000 UTC FRI AUG 22.
48 HOUR FORECAST VALID 0000 UTC SAT AUG 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WITHIN 19N132W TO 18N138W TO 15N137W TO 15N134W TO 16N131W TO
19N132W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN NE SWELL.
.24 HOUR FORECAST WITHIN 18N134W TO 21N140W TO 14N140W TO
13N137W TO 15N131W TO 18N134W WINDS 20 KT OR LESS. SEAS 2.5 TO
3.0 M IN NE TO E SWELL.
.48 HOUR FORECAST LITTLE CHANGE.

.WITHIN 11N129W TO 09N132W TO 05N138W TO 04N137W TO 03N132W TO
06N128W TO 11N129W 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 01S108W TO 00N112W TO 00N120W TO 03.4S120W TO 03.4S103W
TO 01S108W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE SWELL.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.

.WITHIN 09N103W TO 10N108W TO 10N119W TO 06N118W TO 05N115W TO
05N104W TO 09N103W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE
TO S SWELL.
.24 HOUR FORECAST WITHIN 11N108W TO 09N113W TO 07N112W TO
07N108W TO 11N108W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN SE
TO S SWELL.
.48 HOUR FORECAST CONDITIONS IMPROVE. 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 0300 UTC THU AUG 21...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 09N85W TO 12N125W TO 11N140W. SCATTERED
MODERATE AND ISOLATED STRONG FROM 03N TO 10N EAST OF 95W...FROM
08N TO 13N BETWEEN 100W AND 120W...AND FROM 10N TO 14N BETWEEN
135W AND 140W.

.FORECASTER CHRISTENSEN. NATIONAL HURRICANE CENTER.

$$