Today NWS Nashville has just released pictures of all 26 EF4 rating postion of cookeville tornado, actully most of these EF4 damage houses were well constructed residence, some being metioned had J bolt and some was attached to the foundation very well. Most of them swept clean as we all can see easily. For dayton tornado last year on 5/27 earned 170mph without EF4 structure damage and this one get 175mph with tons of well constructed FR12 residence swept clean, the inconsistency among different NWS was just such great.