I just created a CG tornado using “Real Clouds” from video copilot and CC Mr. Mercury (for debris field and rain). I show how to do it over at youtube, just uploaded yesterday. I had been searching for realistic tornado in AE for so long, then it just hit me how to do it. The key is this, GET GOOD STORM CLOUD FOOTAGE, as you can manipulate that into what you need.
I also have the problem solved. Our camera saves the footage at 960×720 anamorphic size and so essentially it get’s output to it’s proper 1280×720 widesreen HD size. That was what was throwing me off so much.
Oh and I should add, that we are filming with the Panasonic HXV200, which I just found out that in 720p mode it outputs at 960×720 (4:3) and that’s why we are letterboxing. This confuses me on the visual effects side of things. So I have to figure out how to do VFX in AE and get that to my editor working in FCP.