Description of the upgrade
The fields of soil humidity used in the operational system were changed. In order to compensate for a drying out of the model boundary layer which has been noticed over the last few weeks, particularly over Europe and East Asia, the humidity of the soil was reset to field capacity.
This change resulted in a noticeable impact on the temperature in the daytime boundary layer over continental areas. There was a reduction in the warm bias by several degrees in places and the positive impact was also seen at 850 and 700 hPa. There was also significant reduction in the bias of the dew point temperature at 2 metres.