Why do weather forecasts sometimes fail to predict accurately?

Question

Why do weather forecasts sometimes fail to predict accurately?

In: Other

Answer 1

Weather is a [chaotic system](https://en.wikipedia.org/wiki/Chaos_theory), where a small change in conditions can easily snowball into a huge change later (go from just rain to a tornado, for example). Predictions are generally accurate 6-24 hours in advance, because it’s easy enough to watch the cloud movements on satellite, but further ahead than that, like I said a small change in wind or temperature can drastically alter the weather later on.