Section 4 - Template 12 : Derived forecasts based on all ensemble members at a horizontal level or in a horizontal layer in a continuous or non-continuous time interval

Templates for Section 4

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Octets Key Type Content
10 parameterCategory codetable Parameter category (see Code table 4.1)
11 parameterNumber codetable Parameter number (see Code table 4.2)
12 typeOfGeneratingProcess codetable Type of generating process (see Code table 4.3)
13 backgroundProcess unsigned Background generating process identifier (defined by originating Centre)
14 generatingProcessIdentifier unsigned Forecast generating process identifier (defined by originating Centre)
15-16 hoursAfterDataCutoff unsigned Hours after reference time of data cut-off (see Note 1)
17 minutesAfterDataCutoff unsigned Minutes after reference time of data cut-off
18 indicatorOfUnitOfTimeRange codetable Indicator of unit of time range (see Code table 4.4)
19-22 forecastTime signed Forecast time in units defined by octet 18 (see Note 2)
23 typeOfFirstFixedSurface codetable Type of first fixed surface (see Code table 4.5)
24 scaleFactorOfFirstFixedSurface signed Scale factor of first fixed surface
25-28 scaledValueOfFirstFixedSurface unsigned Scaled value of first fixed surface
29 typeOfSecondFixedSurface codetable Type of second fixed surface (see Code table 4.5)
30 scaleFactorOfSecondFixedSurface signed Scale factor of second fixed surface
31-34 scaledValueOfSecondFixedSurface unsigned Scaled value of second fixed surface
35 derivedForecast codetable Derived forecast (see Code table 4.7)
36 numberOfForecastsInEnsemble unsigned Number of forecasts in the ensemble (N)
37-38 yearOfEndOfOverallTimeInterval unsigned Year of end of overall time interval
39 monthOfEndOfOverallTimeInterval unsigned Month of end of overall time interval
40 dayOfEndOfOverallTimeInterval unsigned Day of end of overall time interval
41 hourOfEndOfOverallTimeInterval unsigned Hour of end of overall time interval
42 minuteOfEndOfOverallTimeInterval unsigned Minute of end of overall time interval
43 secondOfEndOfOverallTimeInterval unsigned Second of end of overall time interval
44 numberOfTimeRange unsigned n - number of time range specifications describing the time intervals used to calculate the statistically- processed field
45-48 numberOfMissingInStatisticalProcess unsigned Total number of data values missing in statistical process
49-60 Specification of the outermost (or only) time range over which statistical processing is done
49 typeOfStatisticalProcessing codetable Statistical process used to calculate the processed field from the field at each time increment during the time range (see Code table 4.10)
50 typeOfTimeIncrement codetable Type of time increment between successive fields used in the statistical processing (see Code table 4.11)
51 indicatorOfUnitForTimeRange codetable Indicator of unit of time for time range over which statistical processing is done (see Code table 4.4)
52-55 lengthOfTimeRange unsigned Length of the time range over which statistical processing is done, in units defined by the previous octet
56 indicatorOfUnitForTimeIncrement codetable Indicator of unit of time for the increment between the successive fields used (see Code table 4.4)
57-60 timeIncrement unsigned Time increment between successive fields, in units defined by the previous octet (see Notes 3 and 4)
61-nn These octets are included only if n>1, where nn = 48 + 12 x n
61-72 As octets 49 to 60, next innermost step of processing
73-nn Additional time range specifications, included in accordance with the value of n. Contents as octets 49 to 60, repeated as necessary.
Notes:

( 1) Hours greater than 65534 will be coded as 65534.

( 2) The reference time in section 1 and the forecast time together define the beginning of the overall time interval.

( 3) An increment of zero means that the statistical processing is the result of a continuous (or near continuous) process, not the processing of a number of discrete samples. Examples of such continuous processes are the temperatures measured by analogue maximum and minimum thermometers or thermographs, and the rainfall measured by a raingauge.

( 4) The reference and forecast times are successively set to their initial values plus or minus the increment, as defined by the type of time increment (one of octets 50, 62, 74 ...). For all but the innermost (last) time range, the next inner range is then processed using these references and forecast times as the initial reference and forecast time.