UPDATE: High surf advisory extended for west-facing shores of Big Island

Update, Jan. 16, 3:36 p.m. The high surf advisory has been extended until 4 a.m. Saturday for west-facing shores of the Big Island, as an extra-large northwest swell continues to impact coastal shorelines, forecasters with the National Weather Service said.

The long-period swell peaked early Friday and is expected to gradually diminish overnight. Despite the slow decline, surf heights will stay above warning levels along the west shores through early Saturday morning on Jan. 17.

Officials warn of strong and potentially dangerous conditions, including powerful breaking waves and hazardous currents. Waves breaking near channel entrances may make navigation difficult and unsafe for vessels.

Authorities urge the public to stay away from affected shorelines and be prepared for possible road closures. Boaters are advised to postpone entering or leaving channels exposed to high surf until conditions improve.

Jan. 13, 3:50 p.m.: The National Weather Service has canceled the high surf advisory for the west-facing shores of the Big Island.

The high surf advisory is extended until 6 p.m. Wednesday for north- and west-facing shores of Niʻihau, Kauaʻi, Oʻahu and Molokaʻi, and the north- facing shores of Maui.

Original post: A high surf advisory is in effect for north- and west-facing shores of the Big Island as a large, long-period northwest swell moves through the Hawaiʻi region, according to the National Weather Service.

Surf heights were expected to build to 6 to 8 feet along exposed west-facing coastlines, with warning-level conditions continuing through 6 p.m. on Tuesday, Jan. 12.

The swell is forecast to rapidly increase surf along north- and west-facing shores statewide, producing strong breaking waves and powerful currents. Officials said these conditions pose a danger to swimmers and others entering the water.

Ocean safety officials urged the public to use caution and heed posted warnings. “When in doubt, don’t go out,” authorities advised.