If there is a nuke attack on the US it can be predicted but it will be as accurate as a 14 day forecast or global warming forecast 50 years into the future. In other words they don't know how any nuke attack will affect the US because the nukes could hit anywhere.
We all should pray that it will never happen.
They will confuse it with the kinds of fallout clouds they are used to reading about, the "take shelter for 2 weeks" kind. pic.twitter.com/JEvIhbe97L— Alex Wellerstein (@wellerstein) September 28, 2017