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This consists of an overpressure shock wave followed by an outward blast wind, often with reverse winds returning to ground zero. But to survive the next few seconds, there's a few things you'll need to do.
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The fact you've lived this long means you're on the periphery, not at ground zero. You've now survived the first seconds of a nuclear detonation, hopefully a "tactical" bomb smaller than that at Hiroshima (which was the equivalent of 15 kilotons of TNT). You find cover to shield the worst of the heat and radiation.
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You've also received substantial doses of invisible nuclear radiation: gamma rays, X-rays and neutrons.
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Wearing pale-coloured clothing or being indoors will help. The intense thermal radiation also causes skin burns, possibly through your clothing. Kremlin says charges against Prigozhin will be dropped, Wagner fighters leave Rostov-on-Don - as it happened It gets incredibly hot and bright, and you shield your eyes to avoid retina burns. The brightness suddenly vanishes, but returns again a short while later and continues - the distinctive double flash caused by competition between the fireball and shock wave. You quickly turn your face away and run for cover. You see a sudden flash in the sky, as bright as (or even brighter than) the sun. Here's what would happen during a tactical nuclear bomb explosion, including the three stages of ignition, blast and radioactive fallout - and how one might be able to survive this. Ukrainian President Volodymyr Zelenskyy has appealed to the rest of the world to take the threat seriously. The use of nuclear weapons is also embedded in Russian military doctrine.
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Russia is estimated to have thousands of tactical nuclear weapons - possibly the world's largest stockpile - which could be deployed at any time. There has been widespread discussion of Russia's threat to use tactical nuclear weapons in its war on Ukraine.
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