FZHW60 PHFO 211509

OFFHFO



Offshore Waters Forecast for Hawaii

National Weather Service Honolulu HI

509 AM HST Tue Apr 21 2026



Hawaiian offshore waters beyond 40 nautical miles out to 240

nautical miles including the portion of the Papahanaumokuakea

Marine National Monument east of French Frigate Shoals



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.



PHZ105-212315-

509 AM HST Tue Apr 21 2026



.Synopsis for the Hawaiian offshore waters...

A weak low N of the area extends a trough S toward the islands. 

NE winds return from late Wednesday onward as high pressure builds

N of the area.



$$



PHZ180-212315-

Hawaiian Offshore Waters-

509 AM HST Tue Apr 21 2026



.TODAY...NW Half, variable winds up to 10 kt. SE Half, E to SE  

winds 10 to 15 kt. Seas 6 to 8 ft. Isolated thunderstorms far N 

waters.

.TONIGHT...NE to E winds up to 10 kt NW Half, E to SE 10 to 15 kt

SE Half. Seas 6 to 8 ft. 

.WEDNESDAY...NW half, NE winds up to 10 kt. SE half, E to SE 10 

to 15 kt becoming NE in the afternoon. Seas 6 to 8 ft. 

.WEDNESDAY NIGHT THROUGH SATURDAY...NE winds 10 to 20 kt. Seas 6 

to 7 ft. 



$$