Annex 1: WDQMS Performance Targets Surface Synoptic Land Stations Requirements for Observation cycles are defined in OSCAR/Surface as well as in the Manual on GOS (WMO-No. 544), Volume II - Regional Aspects. According to the Manual on GOS, Volume II, the minimum of 3 observations at main hours in UTC and 5 observations at main and intermediate hours (i.e. 3-hourly) are required (MRQ). Targeted are 4 observations at main hours in UTC and 8 observations at main and intermediate hours (i.e. 3-hourly) required (TRQ). It should be noted that values for performance targets listed below are examples used for the WDQMS of Regional Association RA VI. It is up to the RAs to define their own performance targets. Performance Target Table 1: Surface Synoptic Land Stations Parameter Target Comment Data 95% Percentage of monthly data availability: availability from the surface land station network Percentage of Manual on GOS according to the schedule observations MRQ: 50% as outlined in received from TRQ: 95-100% (depending on OSCAR/Surface (number of Network the RA) obs received per month compared to number of obs expected per month) Percentage of data received Timeliness: by target times (HH+100 or Percentage HH+50) to be calculated on received by 95% a monthly basis. HH+100 90% Targets relate to HH+50 percentage of data actually received, not expected. Threshold requirement Breakthrough requirement Trueness Precision - - Target Target for Threshold for standard for gross Parameter bias: deviation: errors Comment Bias as measure of Pressure (hPa) 0.5 hPa 1.5 hPa 10 hPa trueness: On average < 15% of (several days) the absolute all value of daily calculated single bias of pressure obs. observations (P BIAS) should not exceed the given target. Standard deviation as measure of precision: On average (several days) the daily calculated standard
Annex 1: WDQMS Performance Targets Surface Synoptic Land Stations Requirements for Observation cycles are defined in OSCAR/Surface as well as in the Manual on GOS (WMO-No. 544), Volume II - Regional Aspects. According to the Manual on GOS, Volume II, the minimum of 3 observations at main hours in UTC and 5 observations at main and intermediate hours (i.e. 3-hourly) are required (MRQ). Targeted are 4 observations at main hours in UTC and 8 observations at main and intermediate hours (i.e. 3-hourly) required (TRQ). It should be noted that values for performance targets listed below are examples used for the WDQMS of Regional Association RA VI. It is up to the RAs to define their own performance targets. Performance Target Table 1: Surface Synoptic Land Stations Parameter Target Comment Data availability: Percentage of observations received from Network 95% Manual on GOS MRQ: 50% TRQ: 95-100% (depending on the RA) Percentage of monthly data availability from the surface land station network according to the schedule as outlined in OSCAR/Surface (number of obs received per month compared to number of obs expected per month) Timeliness: Percentage received by HH+100 HH+50 95% 90% Percentage of data received by target times (HH+100 or HH+50) to be calculated on a monthly basis. Targets relate to percentage of data actually received, not expected. Threshold requirement Breakthrough requirement Parameter Trueness - Target for bias: Precision - Target for standard deviation: Threshold for gross errors Comment Pressure (hPa) 0.5 hPa 1.5 hPa 10 hPa < 15% of all single obs. Bias as measure of trueness: On average (several days) the absolute value of daily calculated bias of pressure observations (P BIAS) should not exceed the given target. Standard deviation as measure of precision: On average (several days) the daily calculated standard
WDQMS-RWC_en.docx