I need some help with tornado rating

Thanks for additional comments. Any more would surely be appreciated!

One thing that has been also noticed ... look at the direction of the winds, it was from bottom side of the photo towards the top (from W towards N there)...but then look at the building's roofs where they have been blown? Towards WNW, so almost in the opposite direction of main flow.

I cannot imagine such, lets say vorticity along the strong downburst, that would remove roof in the opposite direction. Any comments on that? Only tornado could do something like that, imo.
 
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