I watched a couple videos today about people sending weather balloons with gopros up. It seems interesting, and a fun project. But finding the thing looks like a pain in the ass, and would be troublesome here.
The things can land like 35+ miles away from where you send them up. It worries me sending a balloon up in Oakland and having it landing on the freeway in Pittsburg...or 30 miles off in the middle of the water...or on someones roof in Vallejo...