Let me add some civil defense advice to Mr. Bahadur’s comments. In case of a local nuclear explosion where one does not experience direct effects (blast, burns, radiation – say 5 miles), the important thing is to SIT STILL unless dirt starts falling from the big black smoke cloud forming from the mushroom cloud. That dirt is fallout and is highly radioactive. GET out from under the BLACK CLOUD and away from the fallout.

Otherwise, SIT STILL. With no fallout, you are OK. The Federal government will be on the air within 15 minutes with a prediction of the fallout path. Note that radio wave communications may be disrupted for a while so check cable, internet, etc. The reason to sit still is that you do NOT want to cross the path of the fallout cloud. If the predictions say the fallout is coming your way, then follow the directions to get out of its way. Otherwise SIT STILL. That fallout can kill one hundred miles downwind within hours of exposure.

I too recommend “The Effects of Nuclear Weapons” by Glasstone and others if you’ve any technical bent. I’ve my copy and the useful little circular sliderule in the back for calculating effects radii, etc.