Long video, but when it get's up past 12,000 and 13,000 feet, it becomes particularly interesting in that - if taken at face value - demonstrates evidence of our spherical planet: https://www.youtube.com/watch?v=pYZM0_mHD20
While I'm not sure if this video is of a "weather balloon" or a drone, I have seen similar results with drone experimentation in the USA. We live on a spherical AND HOLLOW planet.