The bunker is a good idea so long as you are in it when the blast occurs. Too bad if you’re visiting relatives for Thanksgiving elsewhere. The trick to prepping is knowing when the disaster will occur. I’ve yet to solve that problem. Any ideas?
As long as you're not a huge distance away, or in a target area, you may not be affected by the blast(s) at all.
With any luck, you will be able to drive to your shelter.
Depending on time, distance and wind direction, you may have from an hour to days.
All your contractors and illegal laborers will beat you to it.