Rain making and hurricanes are different by an order of magnitude.
You drop the right chemical in a cloud and you can cause the vapour to condense, which makes it rain. This is what crxforum noted. But there is no way to artificially create a hurricane. Aside from simply not having the technology to manipulate air currents sufficiently to create any kind of storm, the amount of energy in a hurricane makes the world's most powerful nuclear warheads look like pea shooters. That goes double for storms the size of hurricane Rita or Katrina. The most powerful of these storms create winds in excess of 40 mph and are well over 100 miles across; there's no human method of creating that much energy, it simply can't be done. And given that for a hurricane to start conditions have to be exactly a certain way (matching wind shear, proper temperatures in and above the water and sufficient wind to get the whole thing moving) and it's just not feasible for any human intervention to occur. Or, looked at another way, if we had the power to create these things wouldn't it make sense that we could develop a way to stop them, or at least slow them down?
crxforum, I'm not sure what you mean by a 'pinch', unless you're referring to an elctromagnetic pulse. To my knowledge, that only applies to fission-based warheads, not any sort of energy release.
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