re: flying roofs
That's why they use "hurricane clips" and other hardware when attaching roof structures such as rafters and trusses to top plates. They are code in Florida and parts of Georgia and Alabama, as well as in Galveston and Corpus Christi, Texas.
Much of the damage from Hurricane Andrew involved movement of portions or entirities of roof structures from houses, in distances of inches to hundreds of feet. This was followed by severe wind and water damage to the newly unprotected structures, as well as projectile damage.