Ensembles and Probabilistic Prediction. Uncertainty in Forecasting All of the model forecasts I have...
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The work of Lorenz (1963, 1965, 1968) demonstrated that the atmosphere is a chaotic system, in which small differences in the initialization, well within observational error, can have large impacts on the forecasts, particularly for longer forecasts. In a series of experiments found that small errors in initial conditions can grow so that all deterministic forecast skill is lost at about two weeks. A Fundamental Issue