: With the incredible technology that we have today, why is it still impossible to have 100% accuracy on predicting the weather?
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There are many great answers here, I just wanted to show what does a “chaotic system” mean. A [double pendulum](https://en.m.wikipedia.org/wiki/Double_pendulum) is probably the simplest chaotic system.
[Here](https://youtube.com/watch?v=-Fo4ZZfvcTE) is the visualisation of 1,000,000 identical double pendulums released from the same position with very slight variations – about one billionth (10^-9 ) of the circle between the two adjacent ones. Notice how wildly do they deviate after only a couple of rotations. The weather on Earth exhibits the same behaviour but on a larger scale. No matter how precise our measurements are, we will always be some pendulums away from the “real” position, so our calculations will start to deviate from the actual weather after a while.
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