A high surf warning was extended this morning for the north and west shores of Oahu, Kauai, Niihau and Molokai and Maui’s north shore.

The warning is in effect until noon today.

The National Weather Service said a large northwest swell continues to generate high surf this morning, mostly to the smaller islands. Forecasters warn beachgoers of dangerous surf and shorebreaks.

The weather service said 20- to 25-foot waves are expected along the north and west shores of Kauai County and the north shores of Oahu, Molokai and Maui. Surf conditions are predicted to drop to 12 to 18 feet this afternoon.

Fifteen- to 20-foot waves are also forecasted for the west shores of Oahu and Molokai this morning and are likely to drop to 10 to 15 feet later today.

The weather service said surf conditions are expected to continue to subside tonight.