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The availability performance reports are generated by comparing the 6-hourly and daily totals against the respective expected values for each observed variable (Table 2). A performance report is generated individually for each NWP Centre and time interval. For the 6-hourly totals, four reports are generated daily for each of the NWP centres.
GBON Availability is also compared against GBON requirements. According to the draft provisions, the expected frequency of observations is hourly for surface-based and 12-hourly for upper-air observations.
The availability performance reports based on GBON targets are generated by comparing availability against expected values calculated for the different periods using the frequency rules mentioned above. This means that for surface observations, the expected
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observations are 6, 24 and 24
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times the number of days in the month for the 6-hourly
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, daily, and monthly periods, respectively.
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The GBON requirements for upper-air observations
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only
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apply to the daily
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and monthly aggregations, with a total of
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expected observations being 2 and twice the number of days in the month, respectively.
Table 1 - AvailabilityAnchor Table1 Table1
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