Although a northwest swell that brought warning-level surf to the islands is declining today, a high surf advisory remains in effect for the north and west shores of some islands, and a new swell is expected to roll in late tonight.

Surf up to 18 to 24 feet is expected to pound the north shores of Oahu, Maui and Molokai this morning, according to officials at the National Weather Service. The surf is expected to subside a bit, easing to 12 to 16 feet this afternoon.

The west shores of Oahu and Molokai can expect surf up to 12 o 16 feet this morning, weakening to 8 to 12 feet this afternoon, forecasters said.

The high surf advisory is in effect through 6 p.m. today.

Surf is expected to reach warning levels again on Wednesday.

Weather officials said to expect strong longshore and rip currents that could make swimming dangerous in affected areas.