Having some experience with national disasters, I can tell you that emergency agencies need the following items in a hurry:

Tow trucks (you can move just about anything other than the Twin Towers with tow trucks). People get trapped under stuff.

Water

Porta potties

And last but not least, food, then bedding, depending on the nature of the emergency.

In CA the agency in charge on most disasters would be the county sheriff (unless it becomes a NATIONAL DISASTER, in which case all bets are off). If that is the case where you live, I would suggest that you contact that agency, pass out business cards like mad, and really try to get on their good side, so that they will put you on their emergency call-out list...