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I'll venture a guess that was from the terrible movie some years ago. Sounds very much like the epic scene therefrom. :) (I have seen that claimed to be real, not special effects). I would be most surprised if that were, in fact, actual storm footage, amateur or spotter, and quite interested to see it if it really were.
I've seen precious little footage that has much specific debris of major size actually discernible in real footage owing to several factors...if they're really large enough, the amount of dirt and other stuff is such that it isn't possible to see far into the wind field itself. Lots of tin, paper, sheathing, etc., yes; automobiles and such not so much.
Quite often other than on the far horizon when first form, the funnel itself is rain-wrapped to the point it's not even possible to tell there's actually a funnel at all other than rare glimpse that often can't be told from a lower wall cloud, anyway.
Then, on top of that, a large number form from late afternoon or evening mesoscale thunderstorms so that by the time there are tornadoes it's already dark.
Not that there aren't a few, but with as many as there are in the area and with all the spotters w/ cameras monitoring all of them I don't think I've ever actually seen that kind of footage during the event itself; only the aftereffects.
Spotters followed the Greensburg tornado for over two hours and almost
70-80 miles of total track trailing directly behind it but other than a couple of shots against horizon before it got to be truly huge, it was typical in that it was difficult to spot except by lightning or by watching where transformer flashes were as it took out power lines, etc.--