Storm Cooper-Ryan, 17, has been missing for three days

Police are appealing for help in finding missing teenager Storm Cooper-Ryan, who has been missing since Tuesday.

The 17-year-old was last seen in Heddon Greta, west of Newcastle, at around 4pm on Tuesday.

Officers with the Port Stephens-Hunter Police District were notified on Thursday after she could not be located or contacted.

“Police and family have serious concerns for his welfare,” police said Friday.

Storm is described as having a fair complexion, slim build and blonde hair.

She is approximately 155 cm tall.

He is known to frequent Metford, Maitland and Sydney.