A late-season northwest swell is expected to bring surf as big as 15 feet to some islands, according to forecasters at the National Weather Service.

Weather officials posted a high surf advisory Wednesday afternoon through 6 a.m. Thursday for the north- and west-facing shores of Oahu, Kauai, Molokai and Niihau, and the north shore of Maui.

Waves up to 10 to 15 feet are expected along north-facing shores and 8 to 12 feet along west-facing shores are expected to roll in tonight, forecasters said.

Beachgoers are advised to heed advice given by ocean safety officials.