The fertilizer hits the fan and you may have to evacuate your area.
Immediately, the roads and highways will be jammed with unprepared refugees, most of them fleeing in panic to go somewhere - anywhere - else.
A prepper will be prepared for this eventuality, hopefully, and will not join the mindless crowd. But there may be no choice regarding staying or going prior to or during a flood, earthquake, hurricane or tsunami. You may have to join the exodus.
So what is your plan, to get your family to safety, and do you have a vehicle you can depend on? Get some ideas by reading this review of "Bug Out Vehicles and Shelters."