Deteriorating weather conditions are forcing Yellowstone crews to scale down the search for a missing paddler at Shoshone Lake/Kurt Repanshek file

After nearly three weeks of searching, efforts in Yellowstone National Park to find a man who went missing in Shoshone Lake during a paddling trip with his brother are being scaled back, the park announced Friday.

The search for Kim Crumbo, 74, of Ogden, Utah, was winding down in the face of deteriorating weather conditions, which included snow in the forecast. For nearly three weeks crews on the ground, in boats, and in helicopters searched for Crumbo, who was on a four-day paddling trip with his brother, Mark O'Neill, of Chimacum, Washington, when they failed to return and were reported overdue by family.

After the two men were reported missing on September 19, rangers located a vacant campsite with gear on the lake's south shore, as well as a canoe, paddle, PFD, and other personal belongings on the east shore of the lake. Searchers found O’Neill’s body on the east shore of Shoshone Lake on Monday, September 20.

"All of us at Yellowstone extend our deepest sympathies to the families, friends and colleagues of both Mark and Kim," said Yellowstone Superintendent Cam Sholly. "I want to personally thank the teams from Yellowstone, other parks and agencies, and partner organizations who worked to help us locate Mark, and who continue search efforts to bring Kim home."

Rangers will continue limited search efforts as long as conditions allow this year.

Both men were retired from the National Park Service.

Traveler note: Initially, the National Park Service mistakenly said the two men were half-brothers.