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The diagram below was derived from cycles before CY48r1 when the medium range ensemble had 18Km resolution.
Fig6.2.4-1: Plot shows the contributions to the forecast errors calculated for 500hPa heights over the Northern Hemisphere during the period Dec 2016-Feb 2017. These are plotted against forecast lead-time for ensemble control (red) and a single ensemble member(blue). Spatial scales greater than about 150km (wave numbers 0-63) are considered here.
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Note: these diagrams are based on earlier cycles of the IFS when the ensemble control and ensemble members had a resolution of 18km (and HRES a resolution of 9km).
Fig6.2.4-2: Plot shows the contributions to the forecast errors calculated for 500hPa heights over the Northern Hemisphere during the period Dec 2016-Feb 2017. These are plotted against forecast lead-time for ensemble control (red) and a single ensemble member(blue). Wave numbers 0-3 and 4-14 are considered.
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