His flight on Wednesday took his instrumented balloon up to 27,000 ft (including a transponder). His flight track shows wind variations of up to 15 kt over a narrow range of altitudes (the flight occurred during relatively calm weather conditions):
https://www.flightradar24.com/data/a...947db#25630a46
https://www.youtube.com/watch?v=QwzvNAAqH3g