Rescue police on the state's west coast are hoping a break in the weather will allow the Westpac Helicopter to pick up a pair of stranded walkers.
A 19-year-old Rosebery woman suffered a medical condition while hiking near the summit of Mt Murchison and raised the alarm on Tuesday afternoon.'
She was walking with a 20-year-old man.
Bad weather prevented a rescue chopper pickup and they've spent a night in atrocious conditions along with police and SES volunteers.
Another walking party was sent after the pair at around 7 am on Wednesday.
The helicopter remains on standby in case the weather clears, and as of 11 am was heading to Derwent Bridge to refuel.