That site is awesome. I inputted Detroit and a 250 kt device. We're fine where we live right now, but bad news for one of my old neighborhoods in Southwest Detroit (Delray), though another one down there (Springwells Village) is just outside the farthest reaches of the thermal radiation radius. This isn't counting the inevitable fallout, of course. ;-)

As with all these Al-Qaeda/ISIS terror attacks, I think the two most-likely locations for such a missile though, are Washington, D.C. and NYC (political structure in one, financial in the other). Of course, the Russians and the Chinese have thousands of such missiles and we'd all get the chop if they launched.

The NorKs, though, would be committing suicide if they launched on us and I hope they know that. They simply don't have the throw-weight to win a nuclear exchange with us. Not even remotely close. We'd take a serious blow, no doubt about it. But one we could recover from in short order, even (loss of life would be horrendous, I freely admit). They, on the other hand, would become an extinct species about 30 minutes after hitting us.

Seriously, if they were really interested in trying to decapitate us, they'd sneak the device in somehow (and not saying they can... but after closely observing TSA all these years, I'm not saying they can't either ;-) and detonate it right smack in the area of the Capitol (taking out all three branches simultaneously) or do the same down in NYC's financial district.

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"Politics is just show business for ugly people."