High Seas Forecast
Issued by NWS

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781
FZPN02 KWBC 210525
HSFEPI

HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
0545 UTC WED APR 21 2021

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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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).

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 APR 21.
24 HOUR FORECAST VALID 0000 UTC APR 22.
48 HOUR FORECAST VALID 0000 UTC APR 23.

.WARNINGS.

...STORM WARNING...
.LOW 46N157W 995 MB MOVING NW 15 KT. WITHIN 480 NM NE...780 NM
SE...AND 360 NM S QUADRANTS AND 180 NM E OF A FRONT FROM 41N150W
TO 31N154W WINDS 30 TO 45 KT. SEAS 8 TO 16 FT.
.12 HOUR FORECAST LOW 49N159W 985 MB. FROM 52N TO 55N BETWEEN
152W AND 166W WINDS 40 TO 50 KT. SEAS 12 TO 17 FT.
.24 HOUR FORECAST LOW 51N163W 987 MB. FROM 47N TO 58N BETWEEN
153W AND 172W WINDS 30 TO 45 KT. SEAS 11 TO 22 FT. ELSEWHERE
WITHIN 180 NM NE AND E OF A FRONT TO EXTEND FROM 55N150W TO
52N145W TO 44N143W TO 35N147W WINDS 20 TO 30 KT. SEAS 8 TO 13
FT.
.48 HOUR FORECAST LOW 52N165W 998 MB. WITHIN 360 NM N...420 NM
E...660 NM SE...AND 420 NM SW QUADRANTS WINDS 20 TO 30 KT. SEAS
TO 12 FT.

...GALE WARNING...
.LOW 41N165E 1006 MB MOVING NE 10 KT. WITHIN 180 NM NE AND E OF A
FRONT FROM 51N162E TO 46N164E TO THE LOW AND 300 NM E OF A FRONT
FROM THE LOW TO 34N164E WINDS 25 TO 40 KT. SEAS 8 TO 14 FT.
.24 HOUR FORECAST LOW 44N168E 1000 MB. WITHIN 300 N...420 NM
E...AND 120 NM
S QUADRANTS...AND WITHIN 180 NM E OF A FRONT TO EXTEND FROM
42N174E TO
30N168E  WINDS 25 TO 35 KT. SEAS 8 TO 15 FT.
.48 HOUR FORECAST LOW 44N171E 1000 MB. WITHIN 300 NM N
SEMICIRCLE
WINDS TO 25 KT. SEAS TO 10 FT.

...GALE WARNING...
.LOW 47N166W 1003 MB MOVING SE 10 KT. BETWEEN 480 NM AND 660 NM
NE...240 NM AND 600 NM SW...AND 360 NM AND 900 NM NW QUADRANTS
WINDS 25 TO 35 KT. SEAS 8 TO 12 FT.
.24 HOUR FORECAST LOW DISSIPATED. WITHIN 420 NM NE OF A LINE FROM
40N174W TO 36N153W WINDS 20 TO 30 KT. SEAS 8 TO 11 FT.
.48 HOUR FORECAST CONDITIONS DIMINISHED.

...GALE WARNING...
.FROM 32N TO 50N BETWEEN 119W AND 131W AREA OF NW TO N WINDS 25
TO 35 KT. SEAS 8 TO 15 FT.
.24 HOUR FORECAST FROM 36N TO 50N BETWEEN 123W AND 130W AREA OF
NW TO N WINDS 25 TO 35 KT. SEAS 8 TO 16 FT.
.48 HOUR FORECAST FROM 36N TO 43N BETWEEN 123W AND 128W AND FROM
46N TO 50N BETWEEN 125W AND 130W AREA OF NW TO N WINDS 20 TO 30
KT. SEAS 8 TO 13 FT.

...GALE WARNING...
.48 HOUR FORECAST NEW LOW 35N178E 1001 MB. FROM 30N TO 45N
BETWEEN 174W AND 176E WINDS 25 TO 40 KT. SEAS 8 TO 14 FT.

.SYNOPSIS AND FORECAST.

.SEMISOPOCHNOI VOLCANO NEAR 52N180W IS IN A STATE OF UNREST.
MARINERS ARE URGED TO EXERCISE CAUTION. IF YOU ENCOUNTER ANY
ASH...PLEASE REPORT THE OBSERVATION TO THE OCEAN PREDICTION
CENTER BY CALLING 301 683 1520.

.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 120 NM SE AND
E OF A LINE FROM 55N149W TO 51N158W TO 46N158W AND FROM 39N TO
45N BETWEEN 166E AND 163E.
.24 HOUR FORECAST DENSE FOG WITHIN 120 NM NE OF A LINE FROM
53N150W TO 47N145W.
.48 HOUR FORECAST DENSE FOG WITHIN 90 NM NE OF A LINE FROM
54N142W TO 47N138W AND FROM 43N TO 46N BETWEEN 174W AND 178E.

.HIGH 41N177E 1027 MB MOVING SE 30 KT.
.24 HOUR FORECAST HIGH 33N172W 1024 MB.
.48 HOUR FORECAST HIGH 34N160W 1028 MB.

.HIGH 48N137W 1034 MB MOVING S 10 KT.
.24 HOUR FORECAST HIGH 44N137W 1030 MB.
.48 HOUR FORECAST HIGH 34N137W 1026 MB.

.FORECASTER BELL. 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 WED APR 21.
24 HOUR FORECAST VALID 0000 UTC THU APR 22.
48 HOUR FORECAST VALID 0000 UTC FRI APR 23.

.WARNINGS.

.NONE.

.SYNOPSIS AND FORECAST.

.WITHIN 29N120W TO 27N132W TO 30N132W TO 30N118W TO 29N120W
WINDS 20 KT OR LESS. SEAS 8 TO 9 FT IN N SWELL.
.24 HOUR FORECAST WITHIN 29N121W TO 29N127W TO 30N130W TO
30N119W TO 29N121W WINDS 20 KT OR LESS. SEAS 8 FT IN NW TO N
SWELL.
.48 HOUR FORECAST WITHIN 29N120W TO 28N124W TO 30N127W TO
30N120W TO 29N120W WINDS 20 KT OR LESS. SEAS 8 FT IN NW TO N
SWELL.

.WITHIN 03.4S99W TO 03.4S120W TO 00N120W TO 01N111W TO 03.4S99W
WINDS 20 KT OR LESS. SEAS 8 TO 10 FT IN S SWELL.
.24 HOUR FORECAST WITHIN 03.4S83W TO 03.4S120W TO 00N125W TO
05N113W TO 06N103W TO 03.4S83W WINDS 20 KT OR LESS. SEAS 8 TO 10
FT IN S TO SW SWELL.
.48 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.WITHIN 20N131W TO 11N137W TO 10N140W TO 27N140W TO 27N131W TO
20N131W NE TO E WINDS 20 TO 25 KT. SEAS 8 TO 9 FT IN NE SWELL.
.24 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.06 HOUR FORECAST GULF OF CALIFORNIA N OF 30N SW WINDS 20 TO 25
KT. SEAS LESS THAN 8 FT.
.24 HOUR FORECAST GULF OF CALIFORNIA N OF 29N SW WINDS 20 TO 25
KT. SEAS LESS THAN 8 FT.
.48 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.24 HOUR FORECAST WITHIN 11N86W TO 11N88W TO 12N87W TO 11N86W...
INCLUDING GULF OF PAPAGAYO...NE TO E WINDS 20 TO 25 KT. SEAS
LESS THAN 8 FT.
.48 HOUR FORECAST WITHIN 11N86W TO 09N91W TO 11N90W TO 11N86W...
INCLUDING GULF OF PAPAGAYO...E WINDS 20 TO 25 KT. SEAS TO 8 FT.

.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

CONVECTION VALID AT 0300 UTC WED APR 21...

.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH FROM 08N78W TO 10N86W TO 08N94W TO 09N101W TO
05N114W. ITCZ FROM 05N115W TO 04N125W TO 04N140W. SCATTERED
MODERATE ISOLATED STRONG WITHIN 90 NM S AND 150 NM N OF AXIS
BETWEEN 104W AND 139W.



.FORECASTER MUNDELL. NATIONAL HURRICANE CENTER.

NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 160E

SYNOPSIS VALID 0000 UTC APR 21 2021.
24 HOUR FORECAST VALID 0000 UTC APR 22 2021.
48 HOUR FORECAST VALID 0000 UTC APR 23 2021.

.WARNINGS.

...GALE WARNING...
.COLD FRONT FROM 30N161E TO 29N160E MOVING E 10 KT. E TO SE
WINDS 20 TO 25 KT WITHIN 150 NM OF A LINE FROM 22N178W TO
23N171E TO 25N167E. ISOLATED MODERATE TSTMS WITHIN 60 NM OF
FRONT.
.24 HOUR FORECAST COLD FRONT FROM 30N167E TO 21N160E. WARM FRONT
FROM 30N167E TO 26N170E. S TO SE WINDS 20 TO 30 KT N OF 23N
BETWEEN 175E AND 166E. E TO SE WINDS 20 TO 25 KT FROM 25N TO 22N
BETWEEN 174W AND 175E.
.48 HOUR FORECAST COLD FRONT FROM 30N173E TO 18N160E. WARM FRONT
MOVED N OF AREA. S WINDS 30 TO 35 KT N OF 28N BETWEEN 177W AND
177E. S TO SE WINDS 20 TO 30 KT ELSEWHERE N OF 23N BETWEEN 172W
AND 176E.

.SYNOPSIS AND FORECAST.

.LOW NEAR 17N160E 1010 MB MOVING N SLOWLY. TROUGH FROM 19N160E
TO LOW. TROUGH FROM 15N160W TO LOW. TROUGH FROM 19N165E TO LOW.
ISOLATED MODERATE TSTMS FROM 11N TO 04N W OF 167E.
.24 HOUR FORECAST LOW AND TROUGHS DISSIPATED AND MERGED WITH
FRONT DESCRIBED DIRECTLY ABOVE.

.FRONT FROM 30N154W TO 25N159W TO 21N165W MOVING E 10 KT. S
WINDS 20 TO 25 KT N OF 27N BETWEEN 149W AND 155W. ISOLATED
MODERATE TSTMS WITHIN 330 NM E OF FRONT.
.24 HOUR FORECAST FRONT FROM 30N150W TO 24N156W. WINDS DECREASED
TO 20 KT OR BELOW.
.48 HOUR FORECAST FRONT FROM 30N149W TO 24N158W.

.TROUGH FROM 13N180E TO 07N179E MOVING W 15 KT. ISOLATED
MODERATE TSTMS FROM 15N TO 10N BETWEEN 176W AND 176E.
.24 HOUR FORECAST TROUGH FROM 10N169E TO 06N173E.
.48 HOUR FORECAST TROUGH DISSIPATED.

.RIDGE FROM 30N142W TO 24N154W MOVING NE SLOWLY.

.RIDGE FROM 30N176W TO 25N167W MOVING NE 15 KT.

.RIDGE FROM 30N170E TO 27N161E MOVING NE 20 KT.

.E TO NE WINDS 20 TO 25 KT FROM 12N TO 07N BETWEEN 154W AND
164W.
.24 HOUR FORECAST E TO NE WINDS 20 TO 25 KT FROM 12N TO 07N
BETWEEN 160W AND 166W.
.48 HOUR FORECAST E TO NE WINDS 20 TO 25 KT FROM 13N TO 06N
BETWEEN 160W AND 178W.

.SEAS 8 TO 9 FT FROM 24N TO 21N BETWEEN 180E AND 170E.
.24 HOUR FORECAST SEAS 8 TO 9 FT N OF 25N BETWEEN 171E AND 167E.
.48 HOUR FORECAST SEAS 8 TO 10 FT N OF 26N BETWEEN 177W AND
176E.

.REST OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 8 FT.

.ISOLATED MODERATE TSTMS FROM 21N TO 15N BETWEEN 170W AND 174E.

.SCATTERED MODERATE TSTMS FROM 10N TO 04N BETWEEN 165W AND 175W.

.ITCZ FROM 04N140W TO 04N149W. ISOLATED MODERATE TSTMS WITHIN 90
NM OF ITCZ. ITCZ FROM 04N175W TO 01N176E. SCATTERED MODERATE
TSTMS WITHIN 180 NM OF ITCZ.

$$

.FORECASTER FOSTER. HONOLULU HI.



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