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Location: New Albany, Indiana (Greater Louisville)
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My knowledge of meteorology science is very basic... but I do think what happened was that lone super cell ran right along a rain cooled boundary left by earlier storms. I think Hackleburg - Phil Campbell 2011 EF5 did the same thing. It might explained how that storm went 163 miles without needed to cycle. It took a combination of the line catching it from behind and outrunning the best dew points to finally kill that monster.
Southern storm started out linear then became a lone super cell. Very odd in this region, almost always storms start cellular then form into a line later. Circulation was also in middle of storm rather than SW flank. And it started in same place and northern storm but had a much more eastward path, ending up 90 miles further south by I-65.
In order to get an F5 rating it only has to do F5 damage accurately (not emotionally) assessed somewhere along its path. Most F5's show areas of lesser intensity somewhere in their path. It's the nature of the beast.
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