The weather is one of the most complicated dynamic things that happens. The only mesurements we can make are limited data points around the world at different times throughout the day. These have allowed the development of macro-weather forecasts, and the accuracy of these has increased through time. Obviously the further out the forecast the less accurate it is. That being said, there have not been enough measurements on a local scale to really know what causes certain things to happen. Any attempt to control the weather is going off very limited data, and while they might have success on a local level, I doubt it will ever be possible to control the weather on anything more than a limited area.
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