Its probably a good idea to always think to yourself, "If I wanted to get in here, how/what would I do?" Also, an evac situation could be potential to leave important things behind, so be careful and plan accordingly. Some type of surveilance might be a good idea. At least that way you can be sure of the situation and what you're up against.
Something to think about though: Say you've evacuated to your 2nd locale and you find.... someone else already there. Do you have a plan for that yet?
Badger