It said in the video that the chembomb was moving to the opposite direction of the wind.
The wind was blowing some newly laid chemtrails one way and the chembomb was going the opposite direction. So I can't see it being a weather balloon because it would be going in the same direction as the chemtrails.
I don't know if you could see that it looked like it was punctured from the left, like it had been shot with something.
It'd be interesting to see if the people below the explosion come down with some 'unidentified' ailment.