Wanaka search and rescue co-ordinator Sergeant Aaron Nicholson yesterday released Ms Yun's name to the Otago Daily Times in the hope Ms Yun decided to leave the park because of stormy weather on Wednesday, rather than continue to the Dart Hut as she had intended.
Police were alerted late on Wednesday that Ms Yun had not arrived at the Dart Hut, as indicated in her intentions record.
Three teams of alpine specialists conducted aerial and land searches yesterday but failed to locate her.
Wanaka Landsar spokesman Phil Melchoir said Ms Yun had been seen on Wednesday on the track above the bush line, heading towards a marker pylon at 1835m, known as the Pylon.
Conditions on the route were poor on Wednesday, with thunderstorms, heavy rain and fresh snow, and an alternative search scenario was that she had sought shelter.
Another severe weather warning is in place for today.
The tramp between Mt Aspiring Hut and Dart Hut usually takes 8 to 10 hours and includes an exposed, steep alpine section through snow grass and rock bluffs to the Pylon, which is reached about three hours after leaving Mt Aspiring Hut.
The Department of Conservation warns the Cascade Saddle Route is an alpine crossing and should not be attempted in adverse weather.
The poled route is regarded as a black spot for trampers and several have lost their lives in falls over the steep bluffs.
Sgt Nicholson said the search teams would continue until it got dark last night but may not be able to get in today.
Ms Yun lives in Laingholm, West Auckland, and is a New Zealander of Uzbeki descent.
Wanaka police can be contacted on (03) 443-7272.
