That's if it is a ground burst, and you can see the flash...proceed for 24 hours that way, then go where you want.
I'm having a hard time thinking about how or why a nuclear exchange would be limited.
But a limited nuclear exchange would be nothing compared to a high burst EMP attack (which Iran or N.Korea could pull off). That's when you will need all that food Chris mentions, because you won't be getting any food to your local store for a year at best. Of course, the water will stop coming out of the tap pretty quickly.
Read this:
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