Why is the Weather Forecast Still Wrong Despite Advances in AI?

Imagine this scenario, which you might have experienced yourself. You have an important outdoor event, and the morning weather forecast predicts clear skies. But by the afternoon, it suddenly starts pouring rain. Quite a dilemma, right? Why does this happen? Modern technology has advanced at an astonishing rate. We have smartphones, self-driving cars, and even AI-based healthcare systems. Yet, weather forecasts remain unreliable at times. The reason is that weather systems are incredibly complex and difficult to predict. Recently, there was hope that Google DeepMind's AI model, GraphCast, could solve these issues. However, the reality isn't that simple.