HSFEPI
HIGH SEAS FORECAST FOR METAREA XII
NWS OCEAN PREDICTION CENTER WASHINGTON DC
1745 UTC MON MAY 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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).
FOR ANY TROPICAL CYCLONE INFORMATION BEYOND 48 HOURS REFERENCE
THE ASSOCIATED NWS TROPICAL CYCLONE FORECAST/ADVISORY (TCM).
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 MAY 18.
24 HOUR FORECAST VALID 1200 UTC MAY 19.
48 HOUR FORECAST VALID 1200 UTC MAY 20.
.WARNINGS.
...GALE WARNING...
.LOW 50N168W 996 MB MOVING NE 25 KT. FROM 48N TO 50N BETWEEN 164W
AND 168W WINDS 25 TO 35 KT. SEAS 3.5 TO 5 M. ELSEWHERE WITHIN 720
NM NE...E...480 NM SE AND 540 NM S QUADRANTS WINDS 20 TO 30 KT.
SEAS 2.5 TO 4 M...EXCEPT TO 2.5 M N OF THE ALEUTIAN ISLANDS.
.24 HOUR FORECAST LOW 59N163W 990 MB. FROM 48N TO 58N BETWEEN
160W AND 170W WINDS TO 25 KT. SEAS TO 3.5 M...EXCEPT LESS THAN
2.5 M N OF THE ALEUTIAN ISLANDS.
.48 HOUR FORECAST LOW DISSIPATED AND CONDITIONS DIMINISHED.
...GALE WARNING...
.FROM 30N TO 36N BETWEEN 121W AND 136W AND E OF A LINE FROM
36N133W TO 43N127W AREA OF N WINDS 25 TO 35 KT. SEAS 2.5 TO 5 M.
.24 HOUR FORECAST FROM 30N TO 37N BETWEEN 122W AND 140W AND E OF
A LINE FROM 37N132W TO 43N129W AREA OF N TO NE WINDS 20 TO 30 KT.
SEAS 2.5 TO 4 M. ELSEWHERE FROM 43N TO 52N E OF 130W AREA OF NW
WINDS TO 25 KT. SEAS TO 2.5 M.
.48 HOUR FORECAST FROM 30N TO 51N BETWEEN 122W AND 135W AREA OF
NW TO N WINDS 20 TO 30 KT. SEAS 2.5 TO 4 M.
...GALE WARNING...
.12 HOUR FORECAST LOW 37N177W 1004 MB. FROM 34N TO 41N W OF 170W
WINDS 25 TO 35 KT. SEAS TO 3.5 M.
.24 HOUR FORECAST LOW 41N167W 1008 MB. WITHIN 840 NM NE...660 NM
E...420 NM SE...SW AND 240 NM W QUADRANTS WINDS 20 TO 30 KT. SEAS
TO 3.5 M.
.48 HOUR FORECAST LOW ABSORBED BY NEW LOW 56N150W 1003 MB.
BETWEEN 90 NM AND 420 NM NE...120 NM AND 420 NM SE...180 NM AND
900 NM S AND 120 NM AND 300 NM SW QUADRANTS WINDS 25 TO 35 KT.
SEAS 2.5 TO 5 M.
...GALE WARNING...
.36 HOUR FORECAST LOW W OF AREA 49N174E 985 MB. FROM 38N TO 50N W
OF 175W WINDS 20 TO 30 KT. SEAS TO 3 M.
.42 HOUR FORECAST LOW W OF AREA 50N177E 978 MB. FROM 42N TO 51N W
OF 174W WINDS 35 TO 45 KT. SEAS 3 TO 5 M.
.48 HOUR FORECAST LOW JUST W OF AREA 51N179E 976 MB. FROM 42N TO
52N W OF 170W WINDS 35 TO 45 KT. SEAS 3 TO 6 M. ELSEWHERE FROM
40N TO 55N W OF 166W WINDS 25 TO 35 KT. SEAS 2.5 TO 5 M.
.SYNOPSIS AND FORECAST.
.LOW 56N178W 982 MB DRIFTING SE 05 KT. FROM 40N TO 50N BETWEEN
170W AND 180W AND N OF 50N W OF 170W WINDS 20 TO 30 KT. SEAS TO
3.5 M.
.24 HOUR FORECAST LOW 56N175W 991 MB. FROM 44N TO 54N W OF
170W...WITHIN AN AREA BOUNDED BY A LINE FROM 47N170W TO 55N161W
TO 54N170W TO 47N170W AND IN THE BERING SEA FROM 54N TO 58N W OF
165W WINDS TO 25 KT. SEAS TO 3.5 M...EXCEPT TO 2.5 M IN THE
BERING SEA.
.48 HOUR FORECAST LOW DISSIPATED AND CONDITIONS DIMINISHED.
.COMPLEX LOW WITH MAIN LOW 56N135W 1015 MB MOVING E 10 KT. N OF
50N E OF 147W WINDS TO 25 KT. SEAS 2.5 TO 5 M IN MIXED
SWELL...HIGHEST NEAR 59N146W.
.24 HOUR FORECAST LOW DISSIPATED INLAND WITH NEW LOW TO FORM NEAR
59N153W 1007 MB. N OF 50N BETWEEN 140W AND 160W WINDS 20 TO 30
KT. SEAS 2.5 TO 4 M.
.48 HOUR FORECAST LOW ABSORBED AND CONDITIONS DESCRIBED ABOVE IN
WARNINGS SECTION WITH LOW 56N150W.
.DENSE FOG. VSBY OCCASIONALLY LESS THAN 1 NM WITHIN 120 NM E AND
SE OF A FRONT FROM 50N134W TO 43N145W...WITHIN 180 NM NW OF A
LINE FROM 51N164W TO 49N169W AND IN THE BERING SEA W AND NW OF A
LINE FROM 51N178W TO 57N170W TO 60N175W.
.24 HOUR FORECAST DENSE FOG WITHIN 300 NM W AND NW OF A LINE FROM
34N162W TO 40N159W...FROM 40N TO 50N BETWEEN 150W AND 165W AND IN
THE BERING SEA WITHIN 180 NM N AND NE OF A LINE FROM 55N170W TO
57N177E.
.48 HOUR FORECAST DENSE FOG WITHIN 120 NM NE AND E OF A LINE FROM
42N155W TO 50N151W...WITHIN 60 NM NE AND E OF A LINE FROM 47N141W
TO 52N144W...WITHIN 300 NM NE AND E OF A LINE FROM 50N151W TO
57N156W...FROM 49N TO 56N W OF 170W AND IN THE BERING SEA N OF
59N BETWEEN 165W AND 178W.
.FORECASTER FUTTERMAN. 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 MON MAY 18.
24 HOUR FORECAST VALID 1200 UTC TUE MAY 19.
48 HOUR FORECAST VALID 1200 UTC WED MAY 20.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.WITHIN 30N123W TO 30N128W TO 30N127.5W TO 29.5N126.5W TO
29.5N124.5W TO 30N123W NW TO N WINDS 20 TO 25 KT. SEAS 3.5 TO
4.5 M IN N SWELL. ELSEWHERE WITHIN 23N113W TO 30N115W TO 27N140W
TO 03N140W TO 10N124W TO 16N126W TO 23N113W...INCLUDING SEBASTIAN
VIZCAINO BAY...WINDS 20 KT OR LESS. SEAS 2.5 TO 4.5 M IN N TO NE
SWELL.
.24 HOUR FORECAST WITHIN 23N112W TO 30N118W TO 30N140W TO
08N140W TO 07N126W TO 14N124W TO 23N112W WINDS 20 KT OR LESS.
SEAS 2.5 TO 3.5 M IN N TO NE SWELL.
.48 HOUR FORECAST WITHIN 30N140W TO 07N140W TO 08N129W TO
13N116W TO 19N131W TO 30N140W WINDS 20 KT OR LESS. SEAS 2.5 TO
3.0 M IN N TO NE SWELL.
.WITHIN 11N86W TO 11N87W TO 11N88W TO 10N88W TO 10N86W TO
11N86W...
INCLUDING GULF OF PAPAGAYO...NE TO E WINDS 20 TO 25 KT. SEAS NEAR
2.5 M.
.24 HOUR FORECAST LITTLE CHANGE.
.48 HOUR FORECAST LITTLE CHANGE.
.WITHIN 02N126W TO 03N132W TO 01N135W TO 00N140W TO 00N123W TO
02N126W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S SWELL.
.24 HOUR FORECAST WITHIN 00.5N138.5W TO 00.5N139W TO 00.5N139.5W
TO 00.5N140W TO 00N140W TO 00N138.5W TO 00.5N138.5W WINDS 20 KT
OR LESS. SEAS 2.5 TO 3.0 M IN SE TO S SWELL.
.27 HOUR FORECAST CONDITIONS IMPROVE. WINDS 20 KT OR LESS. SEAS
LESS THAN 2.5 M.
.WITHIN 01S110W TO 00N115W TO 01S119W TO 03S118W TO 03S107W TO
01S110W WINDS 20 KT OR LESS. SEAS 2.5 TO 3.0 M IN S TO SW SWELL.
.24 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 1500 UTC MON MAY 18...
.INTERTROPICAL CONVERGENCE ZONE/MONSOON TROUGH...
MONSOON TROUGH AXIS EXTENDS FROM 10N85W TO 07N96W. ITCZ AXIS
EXTENDS FROM 07N96W TO 07N120W TO BEYOND 08N140W. SCATTERED
MODERATE TO STRONG FROM 02N TO 08N E OF 87W. SCATTERED MODERATE
FROM 03N TO 11N BETWEEN 90W AND 99W. NUMEROUS MODERATE TO
SCATTERED STRONG FROM 01N TO 11N W OF 120W.
.FORECASTER CHAN. NATIONAL HURRICANE CENTER.
NATIONAL WEATHER SERVICE HONOLULU HI
NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W
SYNOPSIS VALID 1200 UTC MAY 18 2026.
24 HOUR FORECAST VALID 1200 UTC MAY 19 2026.
48 HOUR FORECAST VALID 1200 UTC MAY 20 2026.
.WARNINGS.
.NONE.
.SYNOPSIS AND FORECAST.
.TROUGH 30N176W 29N178W 29N180W NEARLY STATIONARY.
.24 HOUR FORECAST TROUGH MOVED N OF AREA.
.TROUGH 30N171W 27N173W 24N174W NEARLY STATIONARY.
.24 HOUR FORECAST TROUGH 30N170W 27N172W 21N172W.
.48 HOUR FORECAST TROUGH 30N167W 27N173W 24N176W.
.WINDS 20 TO 25 KT FROM 07N TO 15N E OF 161W.
.24 HOUR FORECAST WINDS 20 TO 25 KT N OF 10N E OF 151W.
.48 HOUR FORECAST WINDS 20 TO 25 KT IN AREA BOUNDED BY 30N151W
30N140W 08N140W 10N173W 30N151W.
.WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.
.SEAS 2.5 TO 3.5 M FROM 07N TO 22N E OF 160W.
.24 HOUR FORECAST SEAS 2.5 TO 3.5 M FROM 07N TO 19N E OF
165W...AND FROM 19N TO 29N E OF 152W.
.48 HOUR FORECAST SEAS 2.5 TO 3.5 M IN AREA BOUNDED BY 30N152W
30N140W 07N140W 09N171W 30N152W.
.SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA.
.ITCZ 08N140W 08N144W 06N152W 05N158W 02N164W...AND 08N170W
09N173W 04N180W. SCATTERED MODERATE TSTMS WITHIN 240 NM OF ITCZ
BETWEEN 152W AND 162W. ISOLATED MODERATE TSTMS ELSEWHERE WITHIN
210 NM N OF ITCZ AND S OF ITCZ.
$$
.FORECASTER TSAMOUS. HONOLULU HI.=