12? I would say more like six; even that is being gracious. If it happens BEFORE the dead of winter, people have time to migrate. If it happens in the dead of Winter; well, we saw what happened in Katrina; people can't take care of themselves and they will freeze or starve (most likely starve first)
Only those that are prepared will be able to move and survive.
Katrina should have been our wake up call but too many hit the snooze.
Migration is not good. How much supplies can you (the general “you”)carry on your back? Can you migrate very far before being killed? Do you have any idea where you’re migrating to? Do you have any idea what you’re going to do when you get there? It’s best to already be where you intend on hunkering down with all your provisions and knowlege of the area.