Rescue crews are spending their third straight day searching the rugged Cascade foothills east of Seattle for a skydiver who vanished during a jump.

There's been no sign of Kurt Ruppert since he jumped out of a helicopter at 6,500 feet on Thursday afternoon. The 29-year-old from Lake City, Fla., was wearing a special wing suit with fabric under the arms to allow him to glide like a flying squirrel.

Searchers were hoping Ruppert was stuck in a tree with his parachute or perhaps lost in state-owned land around 4,200-foot Mount Si.

Ruppert was wearing a brown and green jumpsuit that likely blends into the terrain.

He was skydiving with two friends, and they were taking turns jumping. The friends were waiting at a grassy landing area, but neither saw whether Ruppert's chute deployed.