I remember seeing a photo somewhere of the Smithville tornado as it was moving through town, and the clay it was scouring up from the ground turned the funnel blood red. I'm not very superstitious, but that photo would have been taken right as a lot of people were losing their lives. Coincidence? Yeah, but it's chilling anyway, and reminds me of the "Dead Man Walking" photo of the Jarrell, TX tornado.
I can't seem to find the original photo anymore, but there is a low-contrast version of it here (the red tint is still
very slightly visible):
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