I think the quickest answer is that weather is chaotic and incredibly complex. https://en.m.wikipedia.org/wiki/Edward_Norton_Lorenz https://en.m.wikipedia.org/

I think the quickest answer is that weather is chaotic and incredibly complex. https://en.m.wikipedia.org/wiki/Edward_Norton_Lorenz https://en.m.wikipedia.org/wiki/Edward_Norton_Lorenz - under scientific career and then Numerical weather prediction as well as Chaos theory, there's a good summary