Weather officials expect a large swell, forecast to roll in tonight, to bring surf up to 30 feet along the north shores of some islands.

A high surf warning was issued for the north and west shores of Oahu, Kauai County, Molokai and the north shore of Maui beginning at 6 a.m. Friday. The west-facing shores of Hawaii island will also be under a high surf warning, effective at noon on Friday. Both high surf warnings are scheduled to expire at 6 a.m. Saturday.

A high surf advisory remains in effect for the north and west shores of Oahu, Kauai County, Molokai, and the north shore of Maui through 6 p.m. today.

Officials at the National Weather Service expect surf along the north and west shores of Maui and the smaller islands to reach 10 to 15 feet today, except for Molokai, where 8- to 12-foot surf is expected. On Friday, the same north-facing shores could see surf up to 25 to 30 feet, with surf up to 15 to 20 feet pounding all west-facing shores, forecasters said.

“Expect ocean water surging and sweeping across beaches, coastal benches and lava flows, creating the potential for impacts to coastal properties and infrastructure, including roadways,” weather officials said.