Ever wonder what would happen if a nuclear bomb was to be detonated somewhere near to you?
Should such a worry have been one of your concerns the answer is now available via NukeMap3D, a Google Earth-based simulator that lets you set ground zero and blast yield, along withl as wind direction and strength and then calculates the fallout map, casualties, and animates the resultant mushroom cloud. You can examine the results from various set viewpoints such as ground zero, airplane, or low earth orbit or navigate to any vantage point you please.
Below is my test using a 100 kiloton bomb detonated in downtown Los Angeles with a 4mph wind traveling WNW. The results are a final cloud (at 271 seconds) 11,840 meters tall and 10,380 meters wide with 101,330 estimated fatalities and 540,760 injured. With the given wind speed and direction the fallout plume reaches will beyond where I live.
Of course, 100 kilotons is not really that big big a blast compared to the likes of the biggest nuclear blast test ever conducted. The Soviet Union's Tsar Bomba was detonated in 1961 and yielded between 55 and 60 megatons. Here's my test repeated with the Tsar Bomba yield; it's rather more dramatic.
That yellow ball is the size of the fireball that would be produced. This is a great, albeit depressing, mashup.