I hope you had a plowed road for that run.
What I see is snow on the front half of the tail and none on the back half. If the tail had followed the contour of the fender flank instead of the backlight, it would be all clear. (And maybe, with a little more taper, twice as long as it needs to be?)
Un-attached flow in the middle of the backlight?
The diagonal streaks are interesting. I'm starting to picture the vortex as like a sheet of paper with one end rolled into a cone, more than the spirals I supposed before.
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