Colin Atagi | Palm Springs Desert Sun

The Desert Sun file photo

A 76-year-old hiker, who left a note asking authorities to look for him if he didn't return at a specific time, is now the subject of a search underway at Joshua Tree National Park.

David Sewell's vehicle was discovered about 8 p.m. Saturday in the Quail Springs parking lot, according to a park news release. Inside his Honda Odyssey was a note that he was beginning his hike about 8:45 a.m. Saturday and he would need help if he didn't return by Sunday.

Sewell is described as legally blind Joshua Tree man with numerous health issues.

According to park officials, Sewell may have been headed to an unspecified location in Johnny Lang Canyon.

HIKER FOUND ALIVE: Senior hiker found alive after days of wandering around Joshua Tree

Officials didn't say if they believe Sewell has water or other hiking equipment.

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High temperatures were expected to be around 90 degrees Monday, according to the National Weather Service. Search and rescue crews were dispatched about 6:45 a.m. Monday and the effort involved about 50 searchers, two K-9 teams and aircraft.

Authorities want anyone with information to call (888) 294-3666.

This is at least the third search effort to take place at the park in the past year.

Last month, San Diego resident Paul Hanks was rescued after a 20-foot fall. He was reported missing after he failed to check into his hotel room.

In October, authorities found the bodies of Joseph Orbeso and Rachel Nguyen, who'd been missing since July.