A model is a small-scale imperfect reproduction of a full-sized original.
The model runs equations that imperfectly describe the actions of the small-scale model.
The equations are a guess as to how things actually function in real life. The equations take short cuts, and make assumptions where no one knows how things function.
Collection of data is far from perfect. The Earth is huge, and there is no way to take enough measurements to obtain usable readings.
Small errors in the input data lead to major errors in the results. This is the meaning of the stupidly-named “butterfly effect.”
Lorentz: Chaos: When the present determines the future, but the approximate present does not approximately determine the future.
They seem to think that a model B-52 is capable of flying a scale distance and dropping a model nuclear H-bomb which will detonate creating a perfectly scaled down nuclear explosion complete with miniature mushroom cloud. of course these B-52s will be piloted by model crewmen. . .