My neighbor 2 doors down has solved this for himself only, he purchased a 20 foot container and parked it on his property, he uses it to store construction materials and what not. Its not a community shelter though, I suspect some of our neighbors don't like the sight of the container, and I don't have the property layout to replicate his. The neighborhood pool might have the space, but then you have local security issues. I have my own supplies in various parts of my house, my detached garage, and in a detached metal out building - assuming one or more survives, so will some part of my stuff.

The rented storage location is interesting, question I have is access in the event of an emergency: will the attendant be there to let you in their locked gate, is the locked gate self-service, or will they be off, fending for themselves or their family?

At the Red Cross we disperse alot of shelter supplies (cots, blankets, etc) around King County, in dozens of locations - churches, community centers, and some dedicated Red Cross locations. All are reasonably secure, they aren't sitting out with just a padlock between them and whoever wants the contents. Then again, folks are less interested in stealing a bunch of cots and blankets, its not like rolls of copper wire or wiring left in walls - which I hear is already being stolen from Joplin MO this week.