What, you wanna take 15 days to rot, not 14?
You probably don't want to do that.
The biggest bomb tested was this:
https://en.wikipedia.org/wiki/Tsar_Bomba
The weapons lined up for use have significantly lower payloads. There's just no point other than shock and awe, and the delivery is a problem. Meaning that you won't get vaporized at 16 miles. However, if you are on your roof and wearing black or dark colors, you might just melt a bunch of your skin off and blind yourself,
then die of that and radiation poisoning. Better to avoid the whole skin melting thing.