I have read numerous posters refer to wind speeds at which structural damage occurs. Some posters have referred to flying debris. No one I have read has referred to what the inevitable water [rain!] associated with these storms does to the equation. Effectively increasing the density of the atmosphere and the force and therefore the potential for damage has to go up proportionally doesn't it?
Debris, some very heavy and deep, in the rising water can cause unanticipated problems.
After a lot of flooding about twelve years ago, a pipeline on the bed of the San Jacinto River (east of Houston) was damaged by debris in the swift current releasing a flammable substance and caused a huge explosion on the river. Luckily, I don't think anyone was injured.
Also, one of the I10 bridges over the same river (one is east-bound, the other west-bound) was hit and damaged, causing traffic problems for months.