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The quality performance of the GCOS upper-air land component is available on WDQMS web tool when we select “quality” (as Monitoring category) of “upper-air” in the “GCOS” monitoring module is selected. By selecting the month and variable, a map will show how the observing network meets the GCOS requirements set for the selected variable. The generated map is based on the root mean square error (rmse, section 3.2) calculated for the month and variable of interest. It shows the stations whose observations are considered useful for Climate purposes (greenish dots), and highlights the major anomalies regarding stations with observations that deviate from the model forecasts quite significantly (yellow, orange and red dots) and exceed the limits set as “threshold” requirements (Table 7). Clicking on a dot on the map opens a screen with detailed information about the station data quality for the selected month, i.e., the rmse of all available variables (i.e., air temperature, wind and humidity). Clicking on “Time series” opens up a screen with a chart containing the quality information over time (1 year), namely the time series with monthly values of rmse of O-B calculated for all the variable available (i.e., air temperature, wind and humidity).