What would a nuclear blast do to your home town?

Daily Mail : The cold war is over, and the possibility of nuclear Armageddon is no longer the potent threat it once was. However, the approximately 23 000 nuclear warheads still in existence are a potential danger, albeit a less immediately compelling one. For those curious about what the consequences of a nuclear strike could be, Alex Wellerstein of the American Institute of Physics has created a Google Maps mashup that allows users to drop a virtual nuclear bomb on any destination in the world and then see the areas affected by fireball, nuclear radiation, air blast, and thermal radiation. Wellerstein developed the application to help his students understand the actual implications of nuclear warfare.