Nasa's planned super pressure balloon launch from Wanaka Airport has been cancelled for today.
Balloon programme office chief Deborah Fairbrother said the launch, which had been scheduled for 10am, was cancelled due to winds.
"Unfortunately the wind was higher than 6 knots and coming in from a cross direction."
The United States space agency has spent several weeks preparing to send a 2.3-tonne stadium-sized balloon on a long-duration test flight around the southern hemisphere.