Are you talking about a member here? I searched the username and didn't come up with anything.
Witnesses + news reports both specifically mention a very wide strip of scouring with "green grass and shrubs" on either side. It looks like the environment is more sort of desert scrub than traditional grassland, but still. I'm assuming the soil would be more conducive to scouring but I don't know without seeing it up close. I did talk to one guy who was there who said the tornado looked more like a dust storm, which suggests there was a huge amount of dirt hoovered up into the funnel. Also makes sense with the horrific Jarrell-like mutilations to some of the animals in the area.
The white lines are various roads/paths - you can see it a bit in the background here: