Why do meteorologists use ens$4$

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Why do meteorologists use ensemble forecasting to create predictions about the weather?

Multiple forecast models are needed because accurate weather forecasting requires all available forecast models.

Multiple forecast models are needed because different types of meteorological data are input into separate forecast models.

Multiple models are needed because it allows meteorologists to better predict possible extreme weather events.

Multiple forecast models are needed because small differences in the initial model conditions can create significant changes in the result of a forecast.