The Big Island and Maui may see some potentially hazardous surf this weekend due to an east-southeast swell from Hurricane Olaf, the National Weather Service said.

At 5 p.m., Olaf, now a Category 2 hurricane, was about 875 miles east of Honolulu and 785 miles east of Kahului, moving north-northeast at 12 mph with maximum sustained winds of 100 mph.

Hurricane force winds extend outward up to 25 miles and tropical storm force winds extend outward up to 175 miles.

Olaf is forecast to curve slightly to the northeast over the next 48 hours with little change in forward speed, officials said.

Olaf is expected to weaken gradually through Sunday.

Oahu’s south-facing shores are under a high surf advisory until 6 a.m. Sunday, while east-facing shores are under the advisory until 6 p.m. Sunday. Surf of 6 to 9 feet is expected. 

The rest of the islands are under a high surf advisory until 6 a.m. Sunday.

The advisory includes the east-facing shores of West Maui and the south-facing shores of all islands.

The waves are expected to be about 5 to 10 feet through late tonight, forecasters said.

Swimmers and surfers are advised to heed caution.