FZPN40 PHFO 210320

HSFNP 



HIGH SEAS FORECAST

NATIONAL WEATHER SERVICE HONOLULU HI

0500 UTC SAT MAR 21 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SUPERSEDED BY NEXT ISSUANCE IN 6 HOURS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 0000 UTC MAR 21 2026.

24 HOUR FORECAST VALID 0000 UTC MAR 22 2026.

48 HOUR FORECAST VALID 0000 UTC MAR 23 2026.



.WARNINGS.



...GALE WARNING...

.COMPLEX LOW 23N163W 1007 MB NEARLY STATIONARY. SECOND LOW 

25N157W 1007 MB MOVING NE SLOWLY. WARM FRONT FRONT FIRST LOW TO 

SECOND LOW TO 27N152W THENCE STATIONARY FRONT TO 30N146W. WARM 

FRONT MOVING NE SLOWLY. TROUGH FROM FIRST LOW TO 21N170W 19N177W. 

SECOND TROUGH 24N158W 19N162W 15N170W 12N177E. MOVING SE SLOWLY. 

WINDS 30 TO 35 KT WITHIN 180 NM N OF WARM FRONT. WINDS 20 TO 30 KT

ELSEWHERE N OF LINE 30N146W 25N158W 24N173W. SCATTERED MODERATE 

TSTMS WITHIN 120 NM N OF WARM FRONT AND LOWS.

.24 HOUR FORECAST COMPLEX LOW 24N164W 1008 MB. SECOND LOW 27N156W

1008 MB. WARM FRONT FROM FIRST LOW TO 24N160W TO SECOND LOW TO 

29N151W 28N147W. TROUGH FROM FIRST LOW 18N170W. SECOND TROUGH 

23N155W 14N168W. WINDS 30 TO 35 KT WITHIN 180 NM OF A LINE 30N151W

25N166W. WINDS 20 TO 30 KT ELSEWHERE N OF LINE 30N144W 27N147W 

25N160W 24N170W. 

.48 HOUR FORECAST COMPLEX LOWS MOVED N OF AREA. FRONT 30N152W 

26N156W 26N162W. TROUGH 30N151W 25N155W 18N162W 12N166W. WINDS 20 

TO 25 KT N 23N BETWEEN 162W AND 171W. 



.SYNOPSIS AND FORECAST.



.FRONT 30N178W 24N180W NEARLY STATIONARY AND DISSIPATING. 

.24 HOUR FORECAST FRONT WEAKENED TO TROUGH 30N178W 27N180W. 

.48 HOUR FORECAST TROUGH DISSIPATED. 



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



.SEAS 4 TO 5 M N OF LINE 30N150W 24N155W 23N173W. SEAS 2.5 TO 4 M

ELSEWHERE N OF A LINE 30N146W 22N160W 17N170W 15N180W. 

.24 HOUR FORECAST SEAS 4 TO 6 M N OF LINE 30N150W 25N160W 25N166W

30N170W. SEAS 2.5 TO 4 M ELSEWHERE N OF LINE 30N145W 25N150W 

21N160W 14N170W 11N180W. 

.48 HOUR FORECAST SEAS 2.5 TO 4 M N OF LINE 30N147W 20N160W 

12N170W 10N180W.



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



.ITCZ 03N140W 03N157W 06N164W 05N180W. SCATTERED MODERATE TSTMS 

WITHIN 120 NM OF ITCZ BETWEEN 160W AND 170W. ISOLATED MODERATE 

TSTMS WITHIN 180 NM OF ITCZ W OF 155W. 



$$



.FORECASTER ALMANZA. HONOLULU HI.