PRE-Burst Chaos

During the recent balloon launch on 11/12/09 we experienced a chaos on the way up. This was at 70,000 ft and actually caused the payloads to burst the balloon. Take a look at the videos:

Down Video - http://www.nearspacenetwork.com/video/preburst-chaos-vidoeo-111209-1
Up Video - http://www.nearspacenetwork.com/video/preburst-chaos-vidoeo-111209
Frame by Frame of burst - http://www.nearspacenetwork.com/photo/albums/payload-burst-the-balloon

Let me know your input on what could be causing this chaos in the upper atmosphere.