The Offshore Waters Forecast for Hawai`i.

Major Winter Storm Ongoing in the Upper Midwest; Severe Weather Tonight from the Mid-South to the Ohio Valley

A major winter storm will continue to bring blizzard conditions, heavy snowfall, icing, and strong winds through Monday across the Upper Midwest and Upper Great Lakes. A line of storms will be capable of producing widespread damaging winds, tornadoes, and some large hail from the Mid-South to the Ohio Valley and the Southeast through tonight, moving into the Mid-Atlantic Monday. Read More >

586 FZHW60 PHFO 180229 OFFHFO Offshore Waters Forecast for Hawaii National Weather Service Honolulu HI Issued by NWS Ocean Prediction Center Washington DC 429 PM HST Tue Mar 17 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. PHZ105-181200- 429 PM HST Tue Mar 17 2026 .Synopsis for the Hawaiian offshore waters... A ridge builds N of the waters through Thursday. A weak low approaches from the W through late this week. The low lifts N of the islands by this weekend. $$ PHZ180-181200- Hawaiian Offshore Waters- 429 PM HST Tue Mar 17 2026 .TONIGHT...SE waters, SE to S winds up to 10 kt. Elsewhere, NE to E winds up to 15 kt, locally 20 kt E of 156W. Seas 6 to 10 ft. Isolated thunderstorms E of 158W. .WEDNESDAY THROUGH THURSDAY...N of 20N, E to SE winds 10 to 20 kt. S of 20N, SE to S winds up to 15 kt. Seas 6 to 10 ft. Isolated thunderstorms. .FRIDAY...N of 22N, E to SE winds 15 to 25 kt. S of 22N, SE to S winds 10 to 15 kt. Seas 6 to 13 ft. Isolated thunderstorms. .SATURDAY...NW half, SW winds 10 to 20 kt. SE half, SE to S winds 10 to 15 kt. Seas 6 to 13 ft. Isolated thunderstorms W of 157W. $$