What would happen if nuclear bomb fell on Manhattan?

Russian intercontinental ballistic missiles are believed to carry a total of approximately 1,000 strategic nuclear warheads that can hit the US less than 30 minutes after being launched. Of this total, about 700 warheads are rated at 800 kilotons; that is, each has the explosive power of 800,000 tons of TNT. CISAC senior research scholar Lynn Eden co-authors this analysis in the Bulletin of the Atomic Scientists that looks at consequences of the detonation of a single such warhead over midtown Manhattan.