Across the Great Plains, many small structures are built sturdily, but are either poorly attached to their foundations or utterly unanchored. Then a severe wind hits, and all that good workmanship which went into the building is wasted! This is a great example from the north side of the Haysville-Wichita tornado of 16 May 1991, which I had witnessed. Although parts of one wall and the roof broke away, the structure as a whole fared much better than a brick house on the same lot that experienced F3 damage. However, this scene alone was rated weak F1 because of no anchoring at all of a small, wooden building to its concrete foundation.
3 E Clearwater KS (17 May 91) Looking NNW
37.5043, -97.4453