Police are appealing for information and public assistance regarding the whereabouts of Adele Morrison.
The 78-year-old was last seen leaving a Port Macquarie residence on March 16 around 6am, and it is alleged she planned to travel to Gloucester by car on the same day.
She was driving a red 2017 Toyota Camry with NSW registration plates DSN47R.
She was reported missing by family members on March 17 to Mid North Coast Police.
According to reports on the Richmond Police District Facebook page, initial investigations revealed Mrs Morrison attended a shopping centre in Gloucester around 10:45am on March 16.
Her following movements remain unknown, and she has not been heard from since.
Police and family members are concerned for her welfare due to her age and the weather conditions in the area where she was last seen.
Ms Morrison is described as being of Caucasian appearance, between 150cm and 160cm tall, with a medium build, grey hair and hazel eyes.
According to social media posts on the Clarence Valley Ratepayers, Residents and Business Owners Facebook page, Ms Morrison is a resident of Maclean and she is also known to frequent the Gloucester, Nabiac, Berrico and Barrington Tops areas.
Anyone who may have seen Ms Morrison or her vehicle or has any information regarding her whereabouts is urged to contact Crime Stoppers on 1800 333 000