FZHW60 PHFO 161506 OFFHFO Offshore Waters Forecast for Hawaii National Weather Service Honolulu HI 506 AM HST Fri Oct 16 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. PHZ105-162215- 506 AM HST Fri Oct 16 2026 .Synopsis for the Hawaiian offshore waters... Surface high pressure far N of the islands will build as it shifts NE of Hawaii through the weekend. A weak surface trough will edge in from the E today, then exit W on Saturday. Stronger high pressure arrives N of the islands on Sunday. $$ PHZ180-162215- Hawaiian Offshore Waters- 506 AM HST Fri Oct 16 2026 .TODAY...E winds 15 to 20 kt. Seas 6 to 8 ft. Isolated thunderstorms S of 16N. .TONIGHT THROUGH TUESDAY...E winds 15 to 25 kt. Seas 7 to 10 ft. $$