Forecasters issued a high surf warning Thursday for the north and west facing shores of Kauai, Oahu and Molokai and the north shores of Maui, which is in effect from noon to 6 p.m. on Friday.
A high surf advisory has also been posted Thursday for the west facing shores of the Big Island until 6 p.m. Friday.
A storm in the North Pacific has generated a large northwest swell that is due to arrive Thursday afternoon and build into the night, according to the National Weather Service.
Surf is expected to rise to 20-to-28-feet-high, measuring the front of the wave, by Thursday night.
The west facing shores of Oahu and Molokai are expected to get 15-to-20-foot wave heights by Thursday night.
Forecasters say you can expect water occasionally sweeping across portions of beaches. The breaking waves may occasionally impact harbors making navigating the harbor channel dangerous.