Ah very fascinating reading thank you for putting this online. This was an incredible event, they even make observations to the setup being exceptional even if this was in the USA. If only we could get one setup a year like this or similar, at least for the purpose of storm chasing. It wouldn't be fun to see a tornado like that go through a town though!
You can actually make out deforestation in the background of the first photo even in that photo copy.
Now when are we going to get a setup like this again? haha