Shooting rotating supercell east of Mitchell SD 5 30 2011. I am driving 90 mph and it is staying up with me. We had a tornado behind us and this is shot seperately from the tornado but same storm, and same storm that produced gustnado we drove through earlier in Bon Home County SD. Goes out of focus for some open window reason last 10 seconds. I am shooting while driving and not paying too much attention to the camcorder.