I keep a bag with emergency supplies for ourselves and another for the gliders, which includes an emergency kit (which I got from The Glider Initiative:
www.thegliderinitiative.org/medical-supplies),
water bottles, and baby food. I also keep their hospital cage (which is small, but will do in an emergency and it folds) next to it. I have a dog tent that zips at the bottom and top, which I use when we stay at places other than home and is more spacious than the hospital cage.
As for getting them to calm down during storms, that would be hard to accomplish. It is not just the noise that bothers them, but the atmospheric pressure changes as well. During storms they are always going to act out, best you can do is try to give them comfort while you're playing with them (if they do come out to play).