An air, land and sea-based search turned up no sign of a missing man in waters off Ninini Beach on Wednesday, according to Kauai County officials.
The search effort will resume at first light on Thursday.
Police have confirmed that the man is 55 years old from Kilauea, but are withholding his name until his family can be properly notified.
The search began at around 8 p.m. Tuesday night when a family member reported that the Kilauea man had not returned home after going for a run and swim earlier that afternoon near Ninini Beach, also known as Running Waters, north of Nawiliwili Bay.
Police officers reported to the scene Tuesday night and located some of his personal belongings and immediately launched a full search.
Personnel from the Kauai Fire Department and the U.S. Coast Guard searched the shoreline until roughly 11 p.m. while a Coast Guard helicopter conducted an aerial search throughout the night.
The effort resumed at first light Wednesdsay morning with additional assistance from Fire Rescue Specialists aboard Air 1 and Radon 1, and personnel from the state Division of Conservation and Resources Enforcement.
Radon 1 utilized side scan SONAR technology, which detects and creates images of objects in the ocean, to conduct a shoreline search from Ahukini Landing in Hanama'ulu to Keoneloa Bay, also known as Shipwrecks, in Poipu.
The Coast Guard MH-65 Dolphin helicopter and Coast Guard Cutter Ahi, a coastal patrol boat, assisted in the search by following computer-modeled drift projections.
According to the National Weather Service, a high surf advisory will be in effect for all north and west facing shores beginning at 6 a.m. Thursday. Strong rip currents are expected to make swimming difficult and dangerous.