wow lv4dogs, you sound REALLY prepared!
My husband & I have talked about it and decided if a tornado comes through, we will have to "hand down" the dogs into the basement - It's more of a tall crawl space with STEEP steps, I don't think they'd go willingly. I also keep a jug of water, a water bowl and extra leashes in the car. I keep a carrier for my old cat handy and had to use it when we evacuated because of a small fire.
I think one of the most important things to do is to GET YOUR DOG MICROCHIPPED! Heaven forbid if anything happen, at least they will be identifiable even without their collars & tags.