Ask HN: Why are we still so bad a weather forecasting?

Feels like an accurate hourly rain forecast is not too much to ask for in 2021. Why is it that it's sometimes off by a whole day? Is it lack of computing power? Unsophisticated models? Is it that the "measuring stations" are in specific locations, and you can't really generalize that to the whole city? Will we ever get to an accurate hourly (minute?) rain forecast?