Ets80 is correct. Most field testing pre-damage is tested by the use of a pressurized wind uplift chamber such as a bell chamber. Insofar as wind uplift post event, when the roof is blown into a pile in the NE corner, it can be easily discerned there is an issue. However, I have seen roofs lift and set with very minimal noticeable damage at first glance. I would recommend retaining a qualified forensics firm who deals with this issue on a regular basis.