What would you do if you had 5-10 minutes to prepare for a nuclear attack? More people would die from radiation than the explosion, so this is a very good question. While the chances of such an event are very, very small, this is something we should all consider.
Below are the guidelines from the Hawaii State Department of Defense; a memo regarding additional shelter in place guidelines from the Dept. of Education can be found here. More information can be found here and frequently asked questions can be found here.