Lifeguards and city officials have closed Hanauma Bay for a second day because of high surf  and strong rip currents inside the reef.

Waves of up to 6 feet are making conditions dangerous for swimmers and snorkelers and underwater visibility is poor officials said today.

Lifeguards also closed the bay Saturday because of similar conditions.

Lifeguards, meanwhile, conducted 12 rescues and took 438 preventative actions at East Oahu beaches Saturday, a spokeswoman for the city Department of Emergency Services said.

About 3:45 p.m., lifeguards assisted a 35-year-old man who suffered an apparent shoulder injury while body surfing at Sandy Beach, said spokeswoman Shayne Enright by email. Paramedics transported him to a trauma center in serious condition.

A high surf advisory for the east shores of Oahu has been extended until 6 p.m. Monday, the National Weather Service reported today.

The advisory has also been extended for the east shores of Kauai, Molokai, Maui and Hawaii. 

Strong trade winds upwind of the islands will continue to produce eight-to-12-foot surf, the NWS said. Waves should decrease to between seven and 10 feet Monday.