FZPN40 PHFO 191509

HSFNP 



HIGH SEAS FORECAST

NATIONAL WEATHER SERVICE HONOLULU HI

1700 UTC THU MAR 19 2026



SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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.



THIS HIGH SEAS FORECAST USES 1-MINUTE AVERAGE WINDS WHICH MAY BE

HIGHER THAN 10-MINUTE AVERAGE WINDS.



SECURITE



NORTH PACIFIC EQUATOR TO 30N BETWEEN 140W AND 180W



SYNOPSIS VALID 1200 UTC MAR 19 2026.

24 HOUR FORECAST VALID 1200 UTC MAR 20 2026.

48 HOUR FORECAST VALID 1200 UTC MAR 21 2026.



.WARNINGS.



...GALE WARNING...

.LOW 23N168W 1007 MB MOVING E SLOWLY. TROUGH FROM LOW TO 23N173W 

24N177W 26N180W MOVING ESE SLOWLY. WARM FRONT FROM LOW TO 25N168W 

26N166W 26N158W MOVING E SLOWLY. SECOND TROUGH 24N165W 24N164W 

22N164W 20N165W 18N168W 13N180W MOVING E 10 KT. E WINDS 20 TO 30 KT

N OF 25N W OF 158W. ISOLATED MODERATE TSTMS FROM 16N TO 22N BETWEEN

160W AND 167W.

.24 HOUR FORECAST LOW 23N164W 1007 MB. TROUGH FROM LOW TO 21N174W 

22N179W 30N178W. WARM FRONT FROM LOW TO 25N159W 25N153W. SECOND 

TROUGH FROM 24N160W 19N163W 15N168W 13N180W. E WINDS 20 TO 30 KT N

OF A LINE 30N148W 24N154W 24N172W.

.48 HOUR FORECAST LOW 24N163W 1007 MB. NEW SECOND LOW NEAR 27N154W

1010 MB. TROUGH FROM SECOND LOW TO 25N155W 23N158W TO FIRST LOW TO 

20N170W 21N179W 30N177W. WARM FRONT FROM SECOND LOW TO 29N150W 

28N147W. SECOND TROUGH FROM 22N159W TO 16N164W 12N172W 11N180W. NE 

TO E WINDS 20 TO 35 KT N OF 27N BETWEEN 150W AND 158W. NE TO E 

WINDS 20 TO 30 KT ELSEWHERE N OF A LINE 30N145W 25N148W 23N170W.



.SYNOPSIS AND FORECAST.



.TROUGH 30N146W 24N151W 18N155W 17N157W 17N165W MOVING NE SLOWLY. 

ISOLATED MODERATE TSTMS WITHIN 270 NM E AND SE OF TROUGH.

.24 HOUR FORECAST TROUGH 28N147W 24N154W 22N158W.

.48 HOUR FORECAST TROUGH MERGED WITH TROUGH DESCRIBED ABOVE.



.COLD FRONT 30N150W 28N152W MOVING ESE 15 KT. 

.24 HOUR FORECAST FRONT DISSIPATED.



.WINDS 20 KT OR LESS OVER REMAINDER OF FORECAST AREA.



.SEAS 3 TO 4 M N OF LINE 30N155W 24N164W 24N180W. SEAS 2.5 TO 3 M 

ELSEWHERE NW OF A LINE 30N150W 05N175W.

.24 HOUR FORECAST SEAS 4 TO 5 M N OF 24N BETWEEN 157W AND 

175W. SEAS 2.5 TO 4 M ELSEWHERE N OF LINE 30N145W 20N162W 11N170W.

.48 HOUR FORECAST SEAS 4 TO 5.5 M N OF A LINE 30N148W 25N156W

23N173W. SEAS 2.5 TO 4 M ELSEWHERE N OF LINE 30N143W 11N177W.



.SEAS 2.5 M OR LOWER OVER REMAINDER OF FORECAST AREA.



.ITCZ 08N147W 08N155W 05N171W 06N170W. ISOLATED MODERATE TSTMS 

FROM 03N TO 08N BETWEEN 161W AND 172W.







$$



.FORECASTER TSAMOUS. HONOLULU HI.