I dont think theres gonna be nuke war so soon, I believe in dooms day.
What "Doomsday"?
http://nuclearsecrecy.com/nukemap/
Type your city in here, along with a specific yield, and it'll calculate how far the effects go.
Oh my god, that is nightmarishly awesome...
Waaargh, I died in an overkill explosion. I couldn't even see our city, but still, it would've gotten me... Now just to see, the Tsar Bomba hits Aussie-land, will it hit us kiwis?
It takes 35 Gt (Gigatons) of nuclear material to irradiate Australia.
Radiation radius: 35.3 km / 21.93 mi
Fireball radius: 79.27 km / 49.26 mi
Air blast radius: 184.8 km / 114.83 mi (20 psi overpressure)
Air blast radius: 487.78 km / 303.09 mi (4.6 psi overpressure)
Thermal radiation radius: 2187.32 km / 1359.14 mi