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Comparison of scores between IFS Cycle 43r3 and IFS Cycle 43r1 for HRES can be found in the IFS Cycle 43r3 scorecard.
Results for the HRES from alpha- and beta-testing are positive, with many of the scores over NH, SH and Europe indicating statistically significant improvements at the 95% level up to about forecast day 5 when forecasts are verified against own analysis. When forecasts are verified against observations, the positive impact of 43r3 is also evident. Improvements are larger in summer than in winter and are to a large extent due to changes to the deep convection scheme and the aerosol climatology, which improved the temperature gradient between extra-tropics and tropics. Improvements are significant for temperature and vector wind throughout the extra-tropical troposphere. In the tropics there is some deterioration in temperature and humidity at certain vertical levels associated with the changes to the deep convection scheme. Surface parameters show partially statistically significant improvements both in the tropics and extra-tropics (2-m humidity, 10-m wind speed, total cloud cover, precipitation), except for 2-m temperature which shows neutral results.
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