Mountain rescue teams, an RAF helicopter and search dogs are involved in the hunt for a missing man.
About 120 mountain rescue volunteers are searching
David Winder, 75, from the Hilton area of Appleby, Cumbria, has not been seen since he went out for his regular walk on Wednesday and did not return.
About 120 mountain rescue volunteers from as far afield as North Wales and southern Scotland are involved.
Cumbria Police said there was increasing concern for his safety because of the weather.
People living in the area have been asked to check outbuildings and barns to as part of the search.
Det Insp Andy Slattery said: "We have had local volunteers from the villages and local farmers out checking their land and their barns.
"And on this occasion, quite unusually, the local mountain rescue teams are searching for a local person.
"It tends to be visitors to the area who are rescued, but on this occasion it is a local person and the local community are doing everything they can to help."