The National Weather Service this afternoon issued a high-surf advisory for the north and west shores of Oahu, Kauai and Niihau, the north shores of Maui and Molokai, and the Kona and Kohala coasts of the Big Island.

A large northwest swell was expected to peak overnight and tomorrow and ease tomorrow night, the weather service said.

The warning remains in effect until 6 a.m. Tuesday.

Surf on the north shores of Oahu, Maui, Molokai, Kauai and Niihau was expected in the 18- to 22-foot range.

The  west shores of Oahu, Kauai and Niihau were due for surf between 12 and 18 feet, forecasters said. Surf along the Kona and Kohala coasts was expected to be between 6 and 10 feet.

The high surf likely will be accompanied by rip currents and localized beach erosion.