The National Weather Service has issued a high surf warning in effect from 9 p.m. Monday to 6 a.m. Wednesday.
The warning applies to parts of Niihau, Kauai, Oahu, Molokai and Maui.
Forecasters say a powerful storm off Kamchatka Peninsula in Russia a few days ago has generated a very large northwest swell.
This swell is expected to reach the Hawaiian islands Monday evening and persist through early Wednesday morning bringing warning level surf to the area.
Surf is expected to increase to 20 to 30 feet along north- and west-facing shores of Niihau and Kauai and along north-facing shores of Oahu, Molokai and Maui, increasing to 12 to 20 feet along west-facing shores of Oahu and Molokai.
Expect ocean water occasionally sweeping across portions of beaches, very strong breaking waves and strong longshore and rip currents.
Breaking waves may occasionally impact harbors making navigating the harbor channel dangerous.
Precautionary/preparedness actions… Large breaking surf, significant shorebreak and dangerous currents make entering the water very hazardous.
Anyone entering the water could face significant injury or death.
Boaters should be aware of an increased number of surfers and body boarders utilizing the harbor channel to access surfing areas.
Click here for KHON2’s Interactive Forecast.