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The options available in the WDQMS web tool control menu when we select to monitor the “quality” (as Monitoring category) of “surface” (as NWP monitoring) are summarised in Table 11. By selecting the date, time, monitoring centre and variable, a map will show how the observing network complies with the NWP requirements set for the selected variable. The map shows the stations whose observations are considered useful for NWP purposes (greenish dots), and highlights major anomalies regarding observations that deviate from the model forecasts quite significantly (orange and red dots) and exceed the limits set for “Threshold” (Table 7).  Clicking on a dot on the map opens a screen with detailed information about the station data quality over time (30 days), namely time series with O-B calculated for the selected interval/variable. It is worth noting that the 6-hourly intervals for a particular monitoring centre will allow to see the details of individual observations that contribute to the average value displayed on the map. This means that it is possible to check the O-B value, the usage (Status, i.e., used or not used because it was rejected by/before the assimilation) and the type of report (Type, i.e., TAC or BUFR) of a particular observation (identified by date and time) by hovering the mouse over each dot in the time series. The “Alert” is an option in the temporal aggregation based on 5-day moving averages across the WIGOS Monitoring Centres designed to warn WMO RWCs about potential quality issues. This measure takes into account the persistence of an existing daily problem.

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