Why is predicting weather so difficult?

Related questions

1. Is the Weather Channel app accurate?
2. How do I change Accuweather to Fahrenheit?
3. How accurate is a 14 day weather forecast?
4. Is the Apple weather app accurate?
5. Do phones have temperature sensors?
6. What is the most accurate weather source?
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8. What tools do meteorologists use to predict the weather?
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