An ensemble forecast is produced by: A) slightly altering the underlying assumptions of a numerical model each time it is run. B) collecting the professional opinions of a group of meteorologists. C) combining the results from several different numerical models into one forecast. D) running one model several times with slightly different initial conditions.

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An ensemble forecast is produced by running one model several times with slightly different initial conditions. This allows for the visualization of the range of possible outcomes and helps to account for uncertainty in the initial observations and inputs to the model.

An Ensemble Forecast Is Produced By