UPDATE 3:35 p.m.: The jubilation that both teen hikers have now been found alive has been tempered by the news that one of the searchers is in intensive care after sustaining what authorities described as "very serious injuries" to his head.
The reserve sheriff's deputy — whom authorities aren't naming — fell more than 60 feet, but his injuries are not life-threatening.
He was airlifted to a local hospital.
Authorities said the deputy's fall illustrates the peril of the area where the hikers got lost, which is not only steep but also has brush up to 10 feet tall.
UPDATE 1:45 p.m.: A second Orange County teen missing since Sunday in the Cleveland National Forest has been found and flown to a hospital for treatment.
News that Rescuers found 18-year-old Kyndall Jack sent a feeling of jubilation through the headquarters of the rescue effort.
“Our rescuers have been out here for four days,” Orange County Sheriff’s Lieutenant Jason Park told reporters Thursday. “Right now everyone is celebrating for our success, regardless of how tired and hungry they are.”
Rescuers were led to Jack after someone called 9-1-1, and reported hearing a woman screaming. Jack was found less than a mile from her car, very close to where her hiking companion, Nicolas Cendoya, 19, was rescued Wednesday.
She’s been flown to a hospital and authorities did not provide any details on her condition.
Park said Jack’s parents wept when they found out their daughter had been found.
“They were very happy,” Park said.
It’s not all good news: A volunteer, reserve sheriff's deputy was hit in the head after he fell searching for Jack. The deputy has also been airlifted to the hospital.
“He’s responsive, but it’s a serious injury,” said Jack.
Map: The staging location at the Trabuco Canyon Station is indicated with a flag. There are several trails and two waterfalls in this area of the Cleveland National Forest, and both are indicated with waterfall icons.
Source: KPCC, OCTrailhikers.com
UPDATE 12:19 p.m. Search crews have rescued an 18-year-old woman who had been missing for days in a Southern California forest.
Orange County sheriff's Lt. Jason Park says Kyndall Jack was rescued by a helicopter but he has no word on her condition.
Park says a rescuer suffered a head injury and is also being airlifted to a hospital.
Jack had been missing since Sunday after setting out on a hike with 19-year-old companion Nicolas Cendoya, who made a 911 call for help that night. He was found in very serious condition from dehydration Wednesday night.
Hospital officials say he's doing better Thursday. He's in stable condition, according to Dr. Mike Ritter, medical director of the emergency department at Mission Hospital in Mission Viejo.
UPDATE 9:29 a.m.: Tammi Sharp, a Mission Hospital spokeswoman, says Nicholas Cendoya is surrounded by his family and is in serious condition. She can't confirm if he's having surgery or not.
Sharp did not give any further details on his condition and said that the has requested privacy.
Searchers continue to look for Cendoya's hiking partner, Kyndall Jack, 18. The pair got lost Sunday night while hiking on the Holy Jim Trail near Rancho Santa Margarita.
PREVIOUSLY: Crews resumed the search for one of two teenage hikers missing in the Cleveland National Forest in Orange County early Thursday morning after her male companion was found dehydrated and disoriented in heavy brush.
Searchers aided by a sheriff's helicopter with infrared sensors were on the scene early Thursday hoping to locate Kyndall Jack, 18.
Her friend, Nicholas Cendoya, 19, was discovered shirtless and parched by another hiker shortly before 8 p.m. Wednesday and airlifted to a hospital. He was talking to paramedics but struggling to answer questions about what had happened and where Jack might be.
"He was extremely confused and disoriented," said Orange County Sheriff's Lt. Jason Park.
Sheriff's investigators planned to talk to him at length once he was recovering at Mission Hospital in Mission Viejo. They hoped to get more direction on where to look for Jack, who was hiking with Cendoya Sunday when the pair made a 911 call from a dying cell phone and set off the search.
The hiker who came across Cendoya went for help and found a firefighting training crew not involved in the search that just happened to be nearby, Park said.
They found Cendoya about a half-mile south of where much of the search had focused. He was surrounded by so much vegetation that the helicopter rescue crew had trouble keeping track of him once they found him.
"When the rescuer was lowered he lost sight of him," said Division Chief Kris Concepcion of the Orange County Fire Authority. "That's how thick the brush was."
Cendoya was in stable condition, Mission Hospital's Dr. Matthew Kaplan told TV reporters.
"He's strong, he's young, he's a healthy young man, and he's pulling through," Kaplan said.
Several dozen searchers with help from helicopters had been combing the rugged hills of Trabuco Canyon in the national forest.
Two volunteers got lost themselves and had to be airlifted out Wednesday afternoon. They were searching the area because the Sunday 911 call was traced to a nearby cell tower, Orange County Fire Authority Capt. John Muir.
Muir said earlier that Cendoya and Jack's "probability for survival is good" with mild weather both day and night.
The two were believed to have gone off trail near Holy Jim Trail, a tree-lined dirt path along a creek that leads to a waterfall and is popular with day hikers.
In the 911 call, they said they were about a mile from Jack's car, which was parked at a trailhead, but rescuers expanded the search when they weren't found nearby.
Jack's mother drew a message on the car's dusty windshield that read: "Kyndall — we r looking wont stop love you mom," and signed it with a heart.
"When you're disoriented because you're out of breath and tired and you think you're one mile away, you could be potentially three or four miles away," Muir said Wednesday afternoon. "There's a lot of ground to cover."
The area is in a section of the national forest in the Santa Ana Mountains, which lie along the border of Orange and Riverside counties southeast of Los Angeles. The trail ranges in elevation from about 2,000 feet to about 4,000 feet.