Searchers aided by a sheriff's helicopter with infrared sensors were on the scene early Thursday hoping to locate Kyndall Jack, 18.

NPR: 1 Calif. Hiker Still Lost, 1 Found And Recovering

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.

NPR: 1 Calif. Hiker Still Lost, 1 Found And Recovering

Kyndall Jack, 18, and Nicolas Cendoya, 19, were recuperating at separate Orange County hospitals from dehydration and minor injuries on Friday evening after being rescued from the Cleveland National Forest, where they had been missing since Sunday.

NPR: Search Crews Recount Dramatic Calif. Hiker Rescue