The Offshore Waters Forecast for Hawai`i.

Storm Impacting the Northwest U.S.; Fire Weather Conditions in Southern California; Severe Weather in the South

A Pacific storm is bringing areas of low elevation rain, moderate to heavy mountain snow, and high winds to the Northwest. Strong Santa Ana winds and very dry conditions are producing elevated to critical fire weather conditions in southern California. Isolated strong to severe thunderstorms are possible through early Wednesday morning across parts of northeast Texas into western Tennessee. Read More >

936
FZHW60 PHFO 210314
OFFHFO

Offshore Waters Forecast for Hawaii
National Weather Service Honolulu HI
514 PM HST Sun Apr 20 2025

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.

PHZ105-211345-
514 PM HST Sun Apr 20 2025

.Synopsis for the Hawaiian offshore waters...
Strong high pressure far NE of Hawaii will weaken on Monday as a
surface trough forms far NW Kauai. A surface low will develop
about 500 nm northwest of Kauai on Tuesday and remain northwest
of the area through Thursday, bringing a chance for thunderstorms
over NW waters. The low will move to the N Friday.

$$

PHZ180-211345-
Hawaiian Offshore Waters-
514 PM HST Sun Apr 20 2025

.TONIGHT...E winds 10 to 20 kt, strongest S of 17N. Seas 6 to 8
ft.
.MONDAY...E to SE winds 10 to 15 kt. Seas 5 to 8 ft.
.MONDAY NIGHT...NW half, SE winds 5 to 15 kt. SE half, E to SE
winds 10 to 15 kt. Seas 5 to 8 ft.
.TUESDAY THROUGH WEDNESDAY...NW half, SE to S winds 10 to 15 kt.
SE half, E to SE winds 10 to 15 kt. Seas 5 to 8 ft. Isolated
thunderstorms NW waters.
.THURSDAY AND FRIDAY...NW half, SE to S winds 10 to 20 kt. SE
half, E to SE winds 15 to 20 kt. Seas 5 to 8 ft. Isolated
thunderstorms NW waters.

$$