Section 4 - Template 13 : Derived forecasts based on a cluster of ensemble members over a rectangular area 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 clusterIdentifier unsigned Cluster identifier
38 NH unsigned Number of cluster to which the high resolution control belongs
39 NL unsigned Number of cluster to which the low resolution control belongs
40 totalNumberOfClusters unsigned Total number of clusters
41 clusteringMethod codetable Clustering method (see Code table 4.8)
42-45 northernLatitudeOfClusterDomain unsigned Northern latitude of cluster domain
46-49 southernLatitudeOfClusterDomain unsigned Southern latitude of cluster domain
50-53 easternLongitudeOfClusterDomain unsigned Eastern longitude of cluster domain
54-57 westernLongitudeOfClusterDomain unsigned Western longitude of cluster domain
58 numberOfForecastsInTheCluster unsigned NC - Number of forecasts in the cluster
59 scaleFactorOfStandardDeviation unsigned Scale factor of standard deviation in the cluster
60-63 scaledValueOfStandardDeviation unsigned Scaled value of standard deviation in the cluster
64 scaleFactorOfDistanceFromEnsembleMean unsigned Scale factor of distance of the cluster from ensemble mean
65-68 scaledValueOfDistanceFromEnsembleMean unsigned Scaled value of distance of the cluster from ensemble mean
69-70 yearOfEndOfOverallTimeInterval unsigned Year of end of overall time interval
71 monthOfEndOfOverallTimeInterval unsigned Month of end of overall time interval
72 dayOfEndOfOverallTimeInterval unsigned Day of end of overall time interval
73 hourOfEndOfOverallTimeInterval unsigned Hour of end of overall time interval
74 minuteOfEndOfOverallTimeInterval unsigned Minute of end of overall time interval
75 secondOfEndOfOverallTimeInterval unsigned Second of end of overall time interval
76 numberOfTimeRange unsigned n - number of time range specifications describing the time intervals used to calculate the statistically- processed field
77-80 numberOfMissingInStatisticalProcess unsigned Total number of data values missing in statistical process
81-92 Specification of the outermost (or only) time range over which statistical processing is done
81 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)
82 typeOfTimeIncrement codetable Type of time increment between successive fields used in the statistical processing (see Code table 4.11)
83 indicatorOfUnitForTimeRange codetable Indicator of unit of time for time range over which statistical processing is done (see Code table 4.4)
84-87 lengthOfTimeRange unsigned Length of the time range over which statistical processing is done, in units defined by the previous octet
88 indicatorOfUnitForTimeIncrement codetable Indicator of unit of time for the increment between the successive fields used (see Code table 4.4)
89-92 timeIncrement unsigned Time increment between successive fields, in units defined by the previous octet (see Notes 3 and 4)
93-nn These octets are included only if n>1, where nn = 80+ 12 x n
93-104 As octets 81 to 92, next innermost step of processing
105-nn Additional time range specifications, included in accordance with the value of n. Contents as octets 81 to 92, repeated as necessary.
(nn+1)-(nn+ NC) List of NC ensemble forecast numbers (NC is given in octet 58)
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 82, 94, 106,....). For all but the innermost (last) time range, the next inner range is then processed using these reference and forecast times as the initial reference and forecast time.