What is the engineering and science involved in making the weather forecasts accurately ?

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What is the engineering and science involved in making the weather forecasts accurately ?

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It’s largely statistics based. Based on hundreds of data points over hundreds of years such as wind, humidity, temperature, precipitation, etc, and then saying based on previous events, for the future similar conditions there is an x% of something happening. So when you see a forecast calling for 50% rain, that means, based on historical data that closely resembles the current or future conditions, it rained 50% of the time.