The butterfly effect, an underlying principle of chaos, describes how a small change in one state of a deterministic nonlinear system can result in large differences in a later state (meaning that there is sensitive dependence on initial conditions).[3] A metaphor for this behavior is that a butterfly flapping its wings in Brazil can cause a tornado in Texas.[4]
Chaos is baked into reality due to the fact everything's connected. It's all about initial conditions, entanglement and feedback loops, crucial characteristics of all things related to weather.