I ran across this somehow today. At Ready America there is a detailed explanation of what you should do should you find yourself in the vicinity of a nuclear blast. I'm not kidding. The site gives advice like:
During a nuclear incident, it is important to avoid radioactive material, if possible.
And there are pictures:
It's good to have pictures with our manuals. Are you taking notes? We should alway have a plan. You know, take action and do something when we find ourselves in a, in ... ah, well, in .... hmmm ......... uncomfortable circumstances.