A high surf warning is in effect for north- and west-facing shores of Oahu, Kauai, Molokai and Niihau and the north-facing shores of Maui.

The National Weather Service in Honolulu issued the warning on Saturday and said it would remain in effect through 6 p.m. today. A large northwest swell is expected to continue throughout the day.

Surf is forecasted to grow 25 to 35 feet for the north and west shores of Kauai and Niihau, and the north shores of Oahu, Maui and Molokai. Surf is expected to grow 18 to 25 feet for the west shores of Oahu and Molokai.

A previously issued high surf warning for west-facing shores of Hawaii island was downgraded to an advisory at 9:37 a.m. today. Wave heights are expected to decrease this afternoon.

Beachgoers should expect very high impacts, including ocean water surging and sweeping across Hawaii beaches.

“Dangerous currents make entering the water very hazardous. Anyone entering the water could face significant injury or death,” the warning said.

In addition, the warning said powerful, longshore- and rip-currents will be present at most beaches.

“Large breaking waves and strong currents may impact harbor entrances and channels causing challenging boat handling,” the warning said.