You might want to add this one:

Assumption: I can wait until the government orders an evacuation.

In the case of hurricanes, no you can't. Neither the <insert colorful adjective here> mayor of New Orleans nor the <insert similarly colorful adjective here> governor of Louisiana ordered an evacuation until after noon on Saturday (that despite the most dire warnings from the National Hurricane Center anyone can recall). Even with all major highway lanes turned outbound, I-10 was still bumper-to-bumper at 5 AM Monday morning. If you have made the decision to evacuate (in advance, I hope), don't hesitate.