Nutty as the whole concept of Las Vegas is, ya gotta admit they knew how to do a firework show! lol
And just think.....by that time it was being done to further the idea of MAD....and best of all, IT WORKED!!!
I remember the closing scene of Outlaw Josey Wales had MAD treaty with the locals, Mr Eastwood assured the Chief they would either live or die together.
With Nevada, in the main, the detonations went ahead only when the wind direction was right. Later the tests were underground. And nothing like North Korea’s methods.
Local knowledge when SHTF is always a good thing, and that includes the wind pattern. I experienced a toxic industrial fire a few years ago. It was about breakfast and the newspeople on the radio were whipping up panic -there were sirens everywhere and traffic jams... but I went outside and behold, as usual, a bright and still morning... the breeze usually develops after 11am when the air gets warmer. So there was no need to panic, the smoke was going to stay pretty much where it was.
Also, a small Geiger gauge can be a good thing to have.