It amazes me that people can predict weather e.g. rain, humidity, wind even to the hour. How accurate is it and how does weather forecast happen?
In: Mathematics
They have satellites and hundreds of weather stations with radar towers giving them data. By looking through past data and finding patterns they can predict what will happen next by finding which start of a pattern fits current conditions best. Also using wind direction and conditions upstream you can predict conditions downstream by just saying it will be similar in a few hours.
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