A high surf advisory for north- and west-facing shores of Niihau, Kauai, Oahu and north-facing shores of Molokai and Maui is in effect until 6 a.m. Thursday.

Weather officials say that the surf could reach between 12 and 18 feet for all north- and west-facing shores of Oahu, Niihau and Kauai and between 8 to 14 feet for all west-facing shores of Maui and Molokai. 

Moderate impact is expected with strong shorebreak and rip currents, which will make swimming difficult and dangerous, officials said.

Beachgoers, swimmers and surfers are advised to exercise caution and follow all advice given by ocean safety officials.