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

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