KITTERY — An air-and-sea search that spanned 29 hours failed to locate a Maine boater who went missing in New Hampshire’s Portsmouth Harbor before the arrival of Hurricane Earl, the U.S. Coast Guard said Saturday.

The search for Robert Schultze of Shapleigh was suspended pending further developments at 7:12 p.m. Saturday after searchers from the Coast Guard, New Hampshire and Maine marine patrols and local fire departments failed to turn up any sign of him, Coast Guard Lt. Nick Barrow said.

The search, which was interrupted a few times because of rough seas and low visibility, included 14 sorties by Coast Guard airplanes and helicopters, Barrow said.

Relatives said the 63-year-old Schultze was fishing near Whaleback Light, an old lighthouse. Schultze’s boat was in good condition, and Schultze was “very familiar with these waters,” they said.

The Coast Guard said skies were sunny when it found Schultze’s empty motorboat anchored near Kitts Rock on Friday afternoon. Boat keys, wetsuits and a license were found.

Earl’s remnants arrived hours later, kicking up dangerous riptides up and down the East Coast. Fog, wind and roiling seas hindered the search for Schultze.

The Coast Guard focused its search Saturday on the Maine shoreline near Kittery and York, Cmdr. Paul Wolf said.

The water temperature was 68 to 70 degrees.

Wolf said the base survival rate is about 20 hours.

His family said Saturday Shultze was out on a fishing trip and was a strong swimmer.