What would happen if a nuclear bomb is dropped on a city?

Playing around with nuclear weapons virtually is fun, there's a visceral joy in blowing things up and a horrifying fascination with things like fireballs, shock waves and radiation and while it does help put our destructive power in perspective. It's not the best way of understanding the real impact of a nuclear explosion, this isn't about city stacks of TNT or about how bright an explosion is. Nuclear weapons are about you so what would really happen if a nuclear weapon were detonated in a major city today? Not nuclear war just one explosion we begin our story in the middle of downtown in a major city people are going to work studying for exams are lost in their thoughts and daily lives right here a nuclear weapon is detonated and time freezes, the first phase of the explosion happens within less than a second, in a millisecond a ball of plasma hotter than the sun appears and grows in a fireball to more than two kilometers across, within this ball everyone is just gone think of water dripped onto a very hot pan, a sizzle and then there's nothing. Most buildings cars trees, sculptures and people all evaporated, first the flash, an intense tsunami of light washes over the city in an instant if you happen to have your head pointed in the direction of the explosion, it renders you blind for a few hours, the heat of this light produces a thermal pulse so energetic and hot that it just burns everything as far as 13 kilometers from the destination site. What this means is that everything in an area of 500 square kilometers that is able to burn starts burning. Plastic, wood, fabric, hair and skin.

If you happen to be in reach of the thermal pulse one moment you're on your way to work the next moment you're on fire ,now the second phase begins, it happens in a few seconds, most people will now first notice that something is wrong but it's already too late for hundreds of thousands, the flash is followed by the shock wave, the heat and radiation of the fireball create a bubble of superheated and super compressed air around it that's now expanding explosively faster than the speed of sound creating winds stronger than hurricanes and tornadoes. Human infrastructure is no match for its power, most major buildings within a kilometer of the fireball are just ground up down to their base, only steel reinforced concrete is able to partially resist the pressure, in the surrounding parks where retirees feed the ducks, trees blackened and smoldering from the heat, a second before snap like toothpicks if you're outside you get tossed away like a grain of dust in a tornado, the shock wave weakens as it travels outwards but still about 175 square kilometers of houses collapse like they're made of cards, trapping tens of thousands of people who didn't have any time to react. Gas stations explode and fire spread throughout the rubble, a mushroom cloud made from the remains of the fireball dust and ash rises kilometers into the sky in the next few minutes and casts a dark shadow over the ruined city, this violently pulls in fresh air surrounding the city destroying more buildings and providing an abundance of oxygen it depends on the city what happens next if there's enough fuel fires may turn into a firestorm that burns the rubble, everybody trapped in it and people trying to flee the devastation up to 21 kilometers from the explosion. People just like you rushed to their windows to take pictures of the mushroom cloud unaware that the shock wave is still coming at them about to shatter their windows and create a blizzard of sharp glass. The third phase begins in the coming hours and days we're used to the idea that help will come no matter. 

The disaster this time is different a nuclear explosion is like every natural disaster at once there are hundreds of thousands or millions of people with serious injuries lacerations, broken bones, serious burns in the next few minutes and hours thousands more will die because of these injuries, countless people are trapped in collapsed buildings like in earthquakes or blinded by the flash death from the blast wave and unable to flee through streets impossible with rubble and debris they're terrified, confused and don't know what's happened to them or why most likely many hospitals have been leveled along with all the other buildings and most medical professionals are either dead or injured along with everyone else, the survivors lucky enough to have been in metro tunnels or standing in the right place to be unburned and unhurt won't have truly escaped harm yet depending on the type of weapon where it explodes and even the weather, an awful black rain can begin with radioactive ash and dust descending on the city covering everything and everyone, the invisible malicious silent horror of radiation takes its turn, every breath carries poison to the lungs of the survivors over the coming days the people who receive the highest doses of radiation exposure will die there will be no help not for hours or maybe even days.

Civilization doesn't operate when there is a total breakdown of infrastructure roads are blocked, train tracks walked runways cluttered with rubble no water, no electricity, no communication, no stores to replenish supplies from help from surrounding cities will have a hard time, entering the disaster zone and even if they can, the radioactive contamination will make it risky to get too close after a nuclear attack. You're on your own, so bit by bit people emerge from the rubble on foot contaminated with radioactive fallout carrying what little they may have left they are slow in pain traumatized and they all need food water and medical treatment fast and the damage done by a nuclear weapon doesn't end when the fires burn out and the smoke clears, the hospitals in the neighboring cities are under-equipped for a disaster of this scale and overwhelmed with tens or hundreds of thousands of patients with serious injuries, in the weeks, months and years to come, many of those who survived will succumb to cancers like leukemia. The reason no government wants you to think about all this is because there is no serious humanitarian response possible to a nuclear explosion there's no way to really help the immediate victims of a nuclear attack this is not a hurricane wildfire or earthquake or nuclear accident, it is all of these things at once but worse no nation on earth is prepared to deal with it, The world has changed in the past few years with world leaders again explicitly and publicly threatening each other with nuclear weapons many experts think the danger of a nuclear strike is higher than it has been in decades, governments tell their citizens that it's good that we have nuclear weapons but it's bad when anyone else gets them, that it's somehow necessary to threaten others with mass destruction to keep us safe but does this make you feel safe? It only takes a small group of people with power to go crazy or rogue, a small misstep or a simple misunderstanding to unleash a catastrophe of unimaginable proportions exploding stuff in videos is fun, exploding things in real life not so much, there is a solution though eliminating all nuclear weapons and vowing never to build them again in 2017, almost two-thirds of all the world's countries supported by hundreds of civil society organizations and the international red cross and red crescent movement agreed to prohibit and eliminate nuclear weapons, it's not about who has nuclear weapons and who doesn't, the weapons themselves are the problem they are deeply immoral and an existential threat to all of us, no matter what country you come from, no matter what political side you find yourself on ,we need to demand that they disappear forever this will not happen without pressure if you want to be part of this pressure there are things you personally can do too visit notonukes.org to learn more about nuclear weapons and what you can do about them.