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Whenever the WDQMS performance targets are revised, the targets defined in WMO RRR for the global NWP application area are taken into account. Table 7 contains the prescribed exceedance limits for the variables monitored by WDQMS as defined by WMO RRR.
Table 6 - Exceedance thresholds of trueness and precision as defined in the Manual on GOS WDQMS Guidance Document (WMO-No. 544), Volume II-Regional Aspects, 2018).
Variable | Trueness | Precision |
Surface pressure | 0.5hPa | 1.5hPa |
Geopotential height | 30m | 40m |
2m Temperature | 0.5K | - |
10m wind vector | 3.0m/s | 5.0m/s |
10m relative humidity | 10% | - |
Upper air temperature | 0.5K | 1.5K |
Upper air wind vector | 3.0m/s | 5.0m/s |
Upper air relative humidity | 10% | - |
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Table 7 - Exceedance limits for of measurement uncertainty (combination of trueness and precision) for the relevant surface and upper-air variables as defined by WMO RRR (https://www.wmo-sat.info/oscar/requirements).
Variable | Goal | Breakthrough | Threshold |
Surface pressure | 0.5hPa | 0.5hPa | 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% |
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