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Variable | Goal | Breakthrough | Threshold |
Surface pressure | 0.5hPa | 1hPa | 1hPa |
Geopotential height | 30m | 30m | 30m |
2m Temperature | 0.5K | 1.0K | 2.0K |
10m wind vector | 0.5m/s | 2.0m/s | 3.0m/s |
10m relative humidity | 2% | 5% | 10% |
Upper air temperature | 0.5K | 1.0K | 3.0 K |
Upper air wind vector | 1.0m/s | 3.0m/s | 5.0m/s |
Upper air relative humidity | 2% | 5% | 10% |
Gross errors
The number of gross errors is obtained by calculating the number of single observations whose O-B departures exceed the prescribed threshold (see Table 6 for all variable thresholds) within the selected period. Then the percentage of gross errors will be calculated as the ratio between the number of gross errors and the total number of single observations for the selected variable and period. The performance threshold for the percentage of gross errors is 15% within a month, which means that the number of gross errors during a month for a particular station and variable should not exceed 15% of all single observations of that particular station and variable. Note that this performance metric is only applied to surface observations in the monthly aggregation.