The first forecasts started in England in the 1840s after the telegraph was invented. They used air pressure, wind direction, and observations from ports to predict stormy weather that could disrupt the shipping industry.
Edit: to elaborate, it’s a lot more about the communication between weather stations than the ability to predict the weather in any one place. These days, the observations come from satellites as well as on the ground so the accuracy has improved immensely. There is a great docuseries on Netflix called Connected and the episode called Clouds explores this topic from the beginning through to modern methods.
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