HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1745 UTC FRI APR 17 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 17.
24 HOUR FORECAST VALID 1200 UTC APR 18.
48 HOUR FORECAST VALID 1200 UTC APR 19.
.WARNINGS.
...STORM WARNING...
.LOW W OF AREA NEAR 49N172E 982 MB MOVING NE 15 KT. WITHIN 540
NM E AND SE QUADRANTS WINDS 25 TO 40 KT. SEAS 3 TO 4.5 M.
ELSEWHERE FROM 36N TO 52N W OF 180W WINDS 20 TO 30 KT. SEAS 2.5
TO 4 M.
.12 HOUR FORECAST LOW 52N175E 974 MB. WITHIN 300 NM N AND NE
QUADRANTS WINDS 35 TO 50 KT. SEAS 4 TO 6 M.
.24 HOUR FORECAST LOW 55N178E 966 MB. WITHIN 300 NM N N AND NW
SEMICIRCLES WINDS 40 TO 50 KT. SEAS 4 TO 8.5 M. ELSEWHERE FROM
45N TO 63N W OF 162W WINDS 25 TO 40 KT. SEAS 3 TO 6 M. ALSO N
OF 45N W OF 160W WINDS 20 TO 30 KT. SEAS 2.4 TO 4 M.
.48 HOUR FORECAST LOW 56N179W 969 MB. WITHIN 300 NM N AND NW
QUADRANTS WINDS 35 TO 50 KT. SEAS 4 TO 8 M. ELSEWHERE N OF 46N
W OF 156W WINDS 25 TO 40 KT. SEAS 3 TO 6 M. ALSO W AND NW OF A
LINE FROM 42N161W TO 49N154W TO 59N148W WINDS 20 TO 30 KT.
SEAS 2.5 TO 4.5 M.
...GALE WARNING...
.LOW 46N145W 1008 MB MOVING NE 10 KT WILL TURN SE AFTER 24
HOURS. FROM 38N TO 51N BETWEEN 158W AND 133W WINDS 20 TO 30
KT. SEAS TO 3.5 M.
.12 HOUR FORECAST LOW 48N142W 1003 MB. WITHIN 300 NM E AND
NE...AND BETWEEN 90 NM AND 420 NM W AND SW QUADRANTS WINDS 25
TO 35 KT. SEAS 2.5 TO 4 M.
.24 HOUR FORECAST LOW 49N140W 996 MB. BETWEEN 120 NM AND 360
NM NE...AND WITHIN 540 NM S AND SW...AND 360 NM NW QUADRANTS
WINDS 25 TO 40 KT. SEAS 3 TO 5.5 M. ELSEWHERE FROM 35N TO 56N
BETWEEN 154W AND 128W WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M.
.48 HOUR FORECAST COMPLEX LOW WITH MAIN CENTER 44N137W 996
MB...AND A SECONDARY CENTER 44N130W 1002 MB. WITHIN 420 NM W
SEMICIRCLE OF MAIN CENTER WINDS 25 TO 40 KT. SEAS 4 TO 8 M.
ELSEWHERE WITHIN 480 NM N AND NE...AND 360 NM S AND SE
QUADRANTS OF SECONDARY CENTER...AND FROM 33N TO 56N BETWEEN
150W AND 133W WINDS 20 T0 30 KT. SEAS 3 TO 6 M.
...GALE WARNING...
.24 HOUR FORECAST LOW 41N179W 994 MB. WITHIN 180 NM OF LOW
CENTER WINDS 35 TO 45 KT. SEAS 4 TO 7 M. ELSEWHERE WITHIN 300
NM OF LOW CENTER WINDS 25 TO 35 KT. SEAS 3 TO 6 M. ALSO FROM
33N TO 45N W OF 165W WINDS 20 TO 30 KT. SEAS 2.5 TO 4.5 M.
.48 HOUR FORECAST LOW DISSIPATED. CONDITIONS DESCRIBED BY
LOW 56N179W ABOVE.
...HEAVY FREEZING SPRAY WARNING...
.LIGHT TO MODERATE FREEZING SPRAY N OF 58N W OF 173W.
.24 HOUR FORECAST LIGHT TO MODERATE FREEZING SPRAY N OF 59N
W OF 172W.
.48 HOUR FORECAST MODERATE TO HEAVY FREEZING SPRAY N OF 60N
W OF 176W. ELSEWHERE LIGHT TO MODERATE FREEZING SPRAY N OF
58N W OF 174W.
.SYNOPSIS AND FORECAST.
.FROM 30N TO 43N BETWEEN 119W AND 129W N TO NW WINDS TO 25
KT. SEAS TO 3.5 M.
.24 HOUR FORECAST CONDITIONS DIMINISHED.
.48 HOUR FORECAST NEW LOW 33N176W 1016 MB WITH A FRONT
FORECAST TO EXTEND FROM 40N160W TO LOW CENTER TO 30N177W.
WITHIN 240 NM W AND SW OF FRONT WINDS TO 25 KT. SEAS TO
3.5 M.
.48 HOUR FORECAST FROM 30N TO 35N BETWEEN 165W AND 156W
WINDS 20 TO 30 KT. SEAS TO 3.5 M.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM N OF 57N W
OF 160W...FROM 46N TO 52N W OF 173W...N OF 56N BETWEEN
146W AND 139W...AND FROM 40N TO 48N BETWEEN 146W AND 135W.
.24 HOUR FORECAST DENSE FOG FROM 53N TO 60N W OF 161W...
FROM 42N TO 50N W OF 176W...N OF 55N BETWEEN 158W AND
135W...AND FROM 41N TO 55N BETWEEN 130W AND 144W.
.48 HOUR FORECAST DENSE FOG WITHIN THE BERING SEA N AND
NW OF A LINE FROM 52N180W TO 57N157W...AND N OF 56N E OF
137W.
.FORECASTER MILLS. 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 FRI APR 17.
24 HOUR FORECAST VALID 1200 UTC SAT APR 18.
48 HOUR FORECAST VALID 1200 UTC SUN APR 19.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.WITHIN 23N109W TO 23N110W TO 23N111W TO 22N111W TO 21N110W TO
22N109W TO 23N109W NW WINDS 20 TO 25 KT. SEAS LESS THAN 2.5 M.
.24 HOUR FORECAST LITTLE CHANGE.
.30 HOUR FORECAST WINDS 20 KT OR LESS. SEAS LESS THAN 2.5 M.
.WITHIN 30N119W TO 30N126W TO 29N126W TO 29N122W TO 30N119W
WINDS 20 KT OR LESS. SEAS 2.5 M IN N SWELL.
.24 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 1500 UTC FRI APR 17...
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
TROUGH EXTENDS FROM 07N77W TO 08N86W TO 05N96W TO 06N108W TO LOW
PRES NEAR 04N110W 1012 MB AND TO 02N114W. ITCZ EXTENDS FROM
06N112W TO 04N124W TO 05N130W TO 04N140W. SCATTERED MODERATE
WITHIN 60 NM S OF TROUGH BETWEEN 97W AND 104W. SIMILAR ACTIVITY
WITHIN 120 NM N OF THE ITCZ BETWEEN 131W AND 135W...WITHIN 60 NM
S OF THE ITCZ BETWEEN 127W AND 130W AND WITHIN 30 NM OF THE ITCZ
BETWEEN 112W AND 115W. A SOUTHERN HEMISPHERIC ITCZ EXTENDS FROM
02S87W TO 02S106W TO 04S121W TO 03S130W TO 03S140W. SCATTERED
MODERATE WITHIN 60 NM N OF THE ITCZ BETWEEN 87W AND 91W...
WITHIN 30 NM OF THE ITCZ BETWEEN 103W AND 107W AND WITHIN 30 NM
OF THE ITCZ W OF 136W.
$$
.FORECASTER AGUIRRE. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W
SYNOPSIS VALID 1200 UTC APR 17 2026.
24 HOUR FORECAST VALID 1200 UTC APR 18 2026.
48 HOUR FORECAST VALID 1200 UTC APR 19 2026.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.TROUGH 30N150W 28N153W 24N157W MOVING E SLOWLY.
.24 HOUR FORECAST TROUGH MERGED WITH NEW FRONT 30N144W 29N147W
28N151W THENCE TROUGH 25N156W.
.48 HOUR FORECAST FRONT 27N140W 26N145W THENCE TROUGH 26N154W.
.24 HOUR FORECAST NEW TROUGH 27N164W 25N168W 21N171W.
.48 HOUR FORECAST NEW LOW NEAR 28N168W 1015 MB. TROUGH 29N160W
29N164W TO LOW. ANOTHER TROUGH FROM LOW TO 24N167W 20N170W. WINDS
20 TO 25 KT N OF 28N BETWEEN 158W AND 162W.
.48 HOUR FORECAST NEW FRONT 30N177W 28N180W.
.WINDS 20 KT OR LESS OVER REMAINDER FORECAST AREA.
.SEAS 2.5 M OR LOWER OVER ENTIRE FORECAST AREA.
.ITCZ 04N140W 06N160W 06N168W 04N176W 03N180W. NUMEROUS MODERATE
TSTMS WITHIN 210 NM N OF ITCZ...AND WITHIN 150 NM S OF ITCZ.
.ISOLATED MODERATE TSTMS FROM 10N TO 14N BETWEEN 156W AND
173W...AND FROM 17N TO 20N BETWEEN 169W AND 175W.
$$
.FORECASTER TSAMOUS. HONOLULU HI.=