An expanded search of dense bushland has failed to find any trace of a 76-year-old man who got lost while trying to retrieve his bogged car.
Peter Willoughby, who has a medical condition that can cause him to become disoriented, was reported missing in northeast Tasmania on Sunday afternoon.
A search involving ground crews, a drone, horse riders and a wilderness paramedic resumed on Tuesday morning.
Police and SES from across Tasmania have been involved in the efforts that have now covered 100ha, but a helicopter was unable to be used due to high winds.
Tasmania Police Inspector Nick Clark said it remained a search mission, but further assessments would be made on Tuesday night.
Police hold serious concerns for Mr Willoughby's welfare and the potential for hypothermia, with heavy rain lashing the region in recent days.
Mr Willoughby, who police describe as not overly mobile but determined, was in bushland near Launceston with others trying to retrieve his bogged station wagon from a rural road.
Police had helped him several days earlier when his car initially got stuck.
Mr Willoughby was wearing a dark blue jumper, blue jeans and sneakers when he was last seen and had left his mobile phone at home.
Several hikers have died in recent weeks after getting into trouble in freezing conditions in southeast Australia.
The bodies of two women were discovered in an alpine hut by a pair of bushwalkers on Friday, northeast of the popular Falls Creek ski resort in Victoria.
A tourist from China who was walking with a group in Tasmania's Cradle Mountain National Park died in late September after becoming overwhelmed by cold weather.
Less than a week later, two bushwalkers were rescued from the same national park with mild hypothermia.
In a separate incident in Tasmania, a 49-year-old woman was killed on Thursday when a raft flipped in rapids on the Franklin River in world-heritage wilderness.
