Update 4:17 p.m.

The National Weather Service extended the high surf warning for most Hawaiian islands until 6 a.m. tomorrow.

The high surf warning was issued for north and west facing shores of Oahu, Niihau, Kauai and Molokai and or north facing shores of Maui.

A large northwest swell will continue to generate warning-level surf overnight before lowering to advisory levels tomorrow morning, weather officials said.

Surf is expected to be between 20 and 25 feet with high impacts sweeping across portions of beaches and strong breaking waves.

Officials urge the public to take precaution as large breaking surf, significant shorebreak and dangerous currents can make entering the water very dangerous.

Previous coverage

A high surf warning is in effect until 6 p.m. today for most of the Hawaiian islands.

The National Weather Service warned beachgoers of hazardous ocean conditions as a large northwest swell is expected to generate waves of 22 to 28 feet along the north and west shores of Niihau and Kauai as well as the north shores of Oahu, Molokai and Maui.

Waves on the west shores of Oahu and Molokai are expected to peak at 15 to 20 feet throughout the day before they subside tonight.