I think this is one of the main reasons for being prepared. Almost all other events will allow you to BugOut. Having a BOB is nice to have, but having a minimum of two weeks supplies at home is more important in most situations.

Minimum preps-
1)70 gallons of water on hand per person.
2)2 weeks worth of canned foods.
3)enough fuel to cook that food.
4)battery powered radio with large supply of batteries.
5)some way to be entertained to keep from go stir crazy.

Maximum preps-
1)generator with stabilized fuel for a month.
2)food and water for at least one month.
3)Large supply of books for reading(might as well learn something)
4)way of filtering all the air in the house.

This is just a short list of what you need. Detailed lists can go on for pages and is only limited by your budget.