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Tools  /  Nuclear Detonation Simulator   Free

Model a nuclear detonation anywhere.

Pick a weapon, drop it on the map, and see the fireball, blast, thermal and radiation rings — plus downwind fallout drifting on the real 500 mb winds and an estimated casualty count from census-tract population. Place several to model an exchange, or load a scenario. Standard scaling laws (Glasstone & Dolan); educational estimates.

Controls
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Surface burst — detonated at ground level to destroy hardened targets like missile silos and bunkers; less blast & thermal reach, but it craters the ground and throws up heavy radioactive fallout that drifts downwind.
Prevailing winds shift through the year — winter is strong & westerly, summer is lighter & more southerly. Pick Manual… to set the wind by hand.
Click the map to detonate
Effects — tap to toggle
Estimates for education & preparedness planning. Effect radii use standard scaling laws (Glasstone & Dolan,The Effects of Nuclear Weapons) calibrated to known events; casualties assign census-tract population to the severest zone reached and depend heavily on sheltering, time of day and warning. Fallout is an approximate downwind footprint, not a WSEG-10 solution, and its casualties are not included in the prompt total. Overlapping detonations may double-count population.

You can't stop the blast. You can plan for the fallout.

Knowing the effects, the fallout footprint and where the safe distance lies is the first step to a shelter-and-evacuation plan.

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