A 69-year-old woman went hiking in California with her husband last week and has not been seen since

Barbara Thomas went hiking with her husband in California’s Mojave desert on Friday and has been missing since, police said.

Thomas, 69, and her husband were separated during the hike, according to the San Bernardino Sheriff’s Department.

“Barbara was last seen wearing a black bikini, a red baseball cap and tan hiking boots with black socks,” the department said. She’s a resident of Bullhead City, Arizona, and has blonde hair and green eyes, authorities said.

She doesn’t have any supplies or a cell phone with her, police said.

There have been multiple search and rescue members and deputies out to look for Thomas but she hasn’t been found yet.

Temperatures have climbed to over 100 degrees since authorities began their search.