A high surf advisory is in effect for the north and west shores of Oahu, Kauai and Niihau, the north shore of Maui and the west shore of Hawaii Island through Saturday at 6 p.m.

The advisory is prompted by a large west-northwest swell that is expected to produce surf of 12 to 18 feet on Kauai and Niihau and 10 to 15 feet on Oahu, Molokai and Maui. Oahu’s south shore could see wave faces of 3 to 7 feet, according to forecasters.

The swell is expected to gradually subside through early next week, when another west-northwest swell is forecast to arrive.

Meanwhile, a high wind warning is also in effect for the summit areas of Hawaii island until 6 p.m. Saturday.

Westerly winds of 35 to 60 miles per hours, with gusts exceeding 80 miles per hour, are expected for elevations above 11,000 feet, according to the National Weather Service.

Pleasant tradewind weather is forecast for the rest of the state through the weekend.

Mostly sunny skies are forecast for Saturday and Sunday in Honolulu and south shores of Oahu, with northwest winds of 10 to 15 mph, highs between 77 and 83 degrees, and lows in the 60s at night.