David Yaghmourian

Correction appended

A search for an Arizona hiker lost since Monday on Mount Hood turned up no sign of him Wednesday.

Dogs, a helicopter and a drone have been used thus far in the search for David Yaghmourian, a 30-year-old Arizona State University research analyst assistant who authorities say was hiking with a friend when they got separated. They were supposed to reunite at Timberline Lodge, but Yaghmourian never arrived.

Yaghmourian took a break because he hurt his leg after the two friends had been hiking for a few days, according to the Clackamas County Sheriff's Office. The friend went on to Timberline Lodge and contacted authorities after seeing no sign of Yaghmourian.

Yaghmourian was last seen at the eastern junction of the Timberline Trail at the Pacific Crest Trail, the sheriff's office said. He is described as 5-foot-10, about 150 pounds with black hair and brown eyes. He was wearing a tan baseball cap, a black Columbia Sportswear jacket, and tan pants. He had a large black backpack with red trim and a yellow towel on top.

Russ Gubele, a spokesman for Mountain Wave Search and Rescue, said the missing hiker had a phone with him, but it died. He said that since Monday, the weather had ranged from fog and rain to sun.

Yaghmourian was carrying a tent, food and a water purifier among his supplies and apparently has clothes to protect him from the elements, Gubele said.

"We're trying to find him as quickly as we can, but chances of survival are higher in these cases if you are traveling with adequate equipment," he said.

Yaghmourian and his friend parted ways about a mile away from Timberline Lodge, Gubele said. Crews initially searched where he was last seen but have since expanded the search to areas including near Ramona Falls and Oregon 26.

During a brief conversation Wednesday with The Oregonian/OregonLive, Yaghmourian's father, Gerry, said the family was hopeful his son would be found.

The sheriff's office asks anyone who sees or comes into contact with Yaghmourian to call the agency's non-emergency line at 503-655-8211.

*Note*: A previous version of this story contained a misspelling of the Mountain Wave Search & Rescue spokesman's name.

-- Everton Bailey Jr.

ebailey@oregonian.com

503-221-8343; @EvertonBailey