HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1745 UTC SAT APR 18 2026
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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 S OF 67N AND N OF 30N E OF A LINE FROM THE BERING STRAIT
TO 53N172E TO 50N180W TO 30N180W
ALL FORECASTS VALID OVER ICE FREE FORECAST WATERS
SYNOPSIS VALID 1200 UTC APR 18.
24 HOUR FORECAST VALID 1200 UTC APR 19.
48 HOUR FORECAST VALID 1200 UTC APR 20.
.WARNINGS.
...STORM WARNING...
.LOW 54N177E 962 MB MOVING NE 10 KT. FROM
51N TO 60N W OF 174W WINDS 35 TO 50 KT. SEAS
4 TO 8 M. ELSEWHERE N OF 42N W OF 163W
WINDS 25 TO 40 KT. SEAS 2.5 TO 6.5 M...HIGHEST
NEAR 50N175W.
.24 HOUR FORECAST LOW 57N180W 968 MB. WITHIN
240 NM SE QUADRANT WINDS 35 TO 50 KT. SEAS 5
TO 9 M. ELSEWHERE N OF 45N W OF 154W...EXCEPT
OVER THE BERING SEA FROM 58N TO 61N E OF 176W.
WINDS 25 TO 40 KT. SEAS 3 TO 8 M...HIGHEST NEAR
54N176W.
.48 HOUR FORECAST LOW 59N171W 994 MB. WITHIN
480 NM SE...180 NM SW...AND 300 NM W AND NW
QUADRANTS WINDS 25 TO 40 KT. SEAS 3 TO 6 M.
...GALE WARNING...
.LOW 37N179W 1010 MB MOVING NE 30 KT. FROM 35N
TO 42N W OF 170W WINDS 25 TO 40 KT. SEAS 2.5 TO 4 M.
ELSEWHERE FROM 33N TO 42N W OF 166W WINDS 20
TO 30 KT. SEAS TO 3.5 M.
.24 HOUR FORECAST LOW DISSIPATED WITH
CONDITIONS DESCRIBED BY LOW 57N180W ABOVE.
...GALE WARNING...
.COMPLEX LOW WITH MAIN CENTER 49N140W 995 MB
MOVING SE 10 KT AND SECOND CENTER 44N135W 1005
MB MOVING NE 15 KT THEN TURNING N AFTER 12 HOURS.
FROM 41N TO 53N BETWEEN 149W AND 140W WINDS 25
TO 35 KT. SEAS 3 TO 4 M. ELSEWHERE FROM 35N TO 55N
BETWEEN 154W AND 129W WINDS TO 25 KT. SEAS TO 3 M.
.12 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER
48N139W 994 MB AND SECOND CENTER 48N133W 1003 MB.
WITHIN 240 NM W AND SW SEMICIRCLES OF MAIN CENTER
WINDS 35 TO 45 KT. SEAS 4 TO 7 M. ALSO WITHIN 180 NM
NE SEMICIRCLE OF SECOND CENTER AND WITHIN 420 NM
W AND SW SEMICIRCLES OF MAIN CENTER WINDS 25 TO
35 KT. SEAS 3 TO 6 M.
.24 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER
45N138W 994 MB AND SECOND CENTER 50N133W 1003 MB.
WITHIN 480 NM W AND SW SEMICIRCLES OF MAIN CENTER
WINDS 25 TO 40 KT. SEAS 4 TO 8 M. ELSEWHERE FROM
31N TO 55N BETWEEN 150W AND 127W WINDS 20 TO 30 KT.
SEAS 3 TO 6 M.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER
36N137W 1003 MB. WITHIN 300 NM SW SEMICIRCLE WINDS
25 TO 35 KT. SEAS 4 TO 7 M. ELSEWHERE FROM 30N TO 50N
BETWEEN 148W AND 123W WINDS 20 TO 30 KT. SEAS 2.5 TO
6 M...HIGHEST NEAR 36N140W.
...GALE WARNING...
.48 HOUR FORECAST LOW W OF AREA 51N175E 994 MB.
FROM 42N TO 54N W OF 171W WINDS 25 TO 35 KT. SEAS
3 TO 6 M.
...HEAVY FREEZING SPRAY WARNING...
.LIGHT TO MODERATE FREEZING SPRAY N OF 59N W OF 173W.
.24 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY
N OF 60N W OF 170W. ELSEWHERE LIGHT TO MODERATE
FREEZING SPRAY N OF 59N W OF 166W.
.48 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY
W AND NW OF A LINE FROM 59N179W TO 60N169W.
.SYNOPSIS AND FORECAST.
.LOW 59N147W 1009 MB DRIFTING S. WITHIN 240 NM W AND
SW QUADRANTS WINDS TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST LOW DISSIPATED AND ASSOCIATED
CONDITIONS DIMINISHED.
.FROM 30N TO 38N BETWEEN 128W AND 117W N TO NW WINDS
LESS THAN 25 KT. SEAS TO 2.5 M.
.24 HOUR FORECAST CONDITIONS DIMINISHED.
.24 HOUR FORECAST W OF A LINE FROM 30N179W TO
39N171W NE WINDS TO 25 KT. SEAS 2.5 TO 4 M.
.48 HOUR FORECAST CONDITIONS DIMINISHED.
.24 HOUR FORECAST FROM 30N TO 35N BETWEEN 165W
AND 156W WINDS TO 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST NEW LOW 32N162W 1012 MB. FROM
30N TO 38N BETWEEN 164W AND 154W WINDS 20 TO 30 KT.
SEAS TO 3.5 M.
.48 HOUR FORECAST...EXCEPT WHERE DESCRIBED ABOVE...
FROM 54N TO 60N BETWEEN 156W AND 139W W TO SW
WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM N OF
54N W OF 164W...FROM 42N TO 50N W OF 174W...FROM 43N
TO 52N BETWEEN 145W AND 130W...AND N OF 52N BETWEEN
148W AND 135W.
.24 HOUR FORECAST DENSE FOG N OF 54N W OF 158W.
.48 HOUR FORECAST DENSE FOG N OF 55N BETWEEN 175E
AND 158W...AND N OF 57N E OF 143W.
.FORECASTER MILLS. 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 1200 UTC SAT APR 18.
24 HOUR FORECAST VALID 1200 UTC SUN APR 19.
48 HOUR FORECAST VALID 1200 UTC MON APR 20.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.36 HOUR FORECAST WITHIN 16N94W TO 16N95W TO 15N95W TO 15N94W TO
16N94W...INCLUDING THE GULF OF TEHUANTEPEC...NW TO N WINDS 20 TO
30 KT. SEAS LESS THAN 2.5 M.
.48 HOUR FORECAST WITHIN 16N95W TO 16N96W TO 13N97W TO 12N97W TO
12N95W TO 14N94W TO 16N95W...INCLUDING THE GULF OF
TEHUANTEPEC...N TO NE WINDS 20 TO 30 KT. SEAS 2.5 TO 3 M.
.42 HOUR FORECAST WITHIN 30N136W TO 30N140W TO 29N140W TO
29N136W TO 30N136W WINDS 20 KT OR LESS. SEAS 2.5 TO 3 M IN NW TO
N SWELL.
.48 HOUR FORECAST WITHIN 30N133W TO 30N140W TO 28N140W TO
28N138W TO 30N133W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.5 M IN NW
TO N SWELL.
.REMAINDER OF AREA WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
CONVECTION VALID AT 1530 UTC SAT APR 18...
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
TROUGH AXIS EXTENDS FROM 07N77W TO 08N86W TO 05N100W TO 05N110W.
ITCZ EXTENDS FROM 05N110W TO 06N121W TO 05N131W TO 05N140W.
SCATTERED MODERATE ISOLATED STRONG WITHIN 120 NM S OF THE ITCZ
BETWEEN 118W AND 125W. SCATTERED MODERATE FROM 02N TO 06N BETWEEN
85W AND 92W AND WITHIN 30 NM S OF THE ITCZ BETWEEN 132W AND
136W. A SECOND ITCZ EXTENDS FROM 01S88W TO 01S110W TO 02S120W
TO 03S130W TO 02S140W. SCATTERED MODERATE WITHIN 180 NM N OF THE
ITCZ BETWEEN 90W AND 104W.
.FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W
SYNOPSIS VALID 1200 UTC APR 18 2026.
24 HOUR FORECAST VALID 1200 UTC APR 19 2026.
48 HOUR FORECAST VALID 1200 UTC APR 20 2026.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.FRONT 30N145W 27N152W THENCE TROUGH 24N154W MOVING E 10 KT.
.24 HOUR FORECAST FRONT 28N140W 27N144W. TROUGH DISSIPATED.
.48 HOUR FORECAST FRONT MOVED E OF AREA.
.TROUGH 27N167W 22N169W 20N171W 15N174W NEARLY STATIONARY.
FREQUENT
MODERATE TSTMS FROM 27N TO 20N BETWEEN 169W AND 161W.
.24 HOUR FORECAST TROUGH 30N167W 24N167W 18N170W.
.48 HOUR FORECAST TROUGH 30N161W 26N161W 23N165W.
.48 HOUR FORECAST NEW TROUGH 30N175W 27N177W 25N180W. SEAS 2.5 TO
3
M NW OF LINE 30N177W 27N180W.
.WINDS 20 KT OR LESS OVER ENTIRE FORECAST AREA.
.SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA.
.ITCZ 05N140W 06N162W 04N180W. SCATTERED MODERATE TSTMS WITHIN 240
NM N OF ITCZ.
.ISOLATED MODERATE TSTMS FROM 20N TO 16N BETWEEN 160W AND 154W.
$$
.FORECASTER M BALLARD. HONOLULU HI.=