The average error fields of an ensemble of 10#x2010;day forecasts made with a global model at the European Centre for Medium Range Weather Forecasts, and first presented by Hollingsworth et al. (1980), are examined. The time evolution of the error fields is presented together with horizontal and vertical cross#x2010;sections through the fields at fixed times to reveal some features of their three#x2010;dimensional structure. The most striking deficiency of the model is seen to be its inability to maintain the amplitude of the quasi#x2010;stationary zonal wavenumber 2 in the middle and upper troposphere.
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