KSEC1 element Contents GRIB octet Recommended GRIB_API keys Coded GRIB_API keys Comments
37 
ECMWF local GRIB use definition identifier.
10 = EPS tubes.
41 localDefinitionNumber localDefinitionNumber
38 Class 42 class marsClass
39 Type 43 type marsType
40 Stream 44-45 stream marsStream
41 
Version number or experiment identifier.
(4 ASCII characters, right justified)
 46-49 expver experimentVersionNumber
42 Tube number (0=central cluster) 50 number
 tubeNumber
43 Total number of tubes (excluding central cluster) 51 totalNumberOfTubes
 totalNumberOfTubes
44 
Central cluster definition
 1: radius = % of total variance
 2: radius = predefined value
 52 centralClusterDefinition
 centralClusterDefinition
45 Indicator of parameter considered (see code table 2 in section 1) 53 parameterIndicator
 parameterIndicator
46 Indicator of type of level considered (see WMO code table 3) 54 levelIndicator
 levelIndicator
47 Northern latitude of the domain of tubing 55-57 northLatitudeOfDomainOfTubing
 northLatitudeOfDomainOfTubing
 "domain" can be used, which will contain the 4 coordinates.
48 Western longitude of the domain of tubing 58-60 westLongitudeOfDomainOfTubing
 westLongitudeOfDomainOfTubing
49 Southern latitude of the domain of tubing 61-63 southLatitudeOfDomainOfTubing
 southLatitudeOfDomainOfTubing
50 Eastern longitude of the domain of tubing 64-66 eastLongitudeOfDomainOfTubing
 eastLongitudeOfDomainOfTubing
51 
Number of tube to which the operational forecast belongs(*)
 0 = central cluster,
 254 = does not belong to any tube
67 numberOfOperationalForecastTube
 numberOfOperationalForecastTube
52 
Number of tube to which the control forecast belongs(*)
 0 = central cluster,
 254 = does not belong to any tube
68 numberOfControlForecastTube
 numberOfControlForecastTube
53 Height/pressure of level considered (see WMO code table 3) 69-70 heightOrPressureOfLevel
 heightOrPressureOfLevel
54 Reference step considered (same units of time as forecast timesteps) 71-72 reference
 referenceStep
55 Radius of central cluster (in units of parameter defined in element 45) 73-74 radiusOfCentralCluster
 radiusOfCentralCluster
56 Ensemble standard deviation (in units of parameter defined in element 45) 75-76 ensembleStandardDeviation
 ensembleStandardDeviation
57 
Distance of the tube extreme to the ensemble mean (in units of parameter
defined in element 45).
Not applicable if this is the central cluster, in which case the value is
set = 65535, ie a missing value.
 77-78 distanceFromTubeToEnsembleMean
 distanceFromTubeToEnsembleMean
58 Number of forecasts belonging to the tube or central cluster, including the control forecast (N) 79 numberOfForecastsInTube
 numberOfForecastsInTube
59->(58+N) 
List of N ensemble forecast numbers (**)
Order is important, first on the list is the tube extreme
80->(79+N) ensembleForecastNumbers
 ensembleForecastNumbers "numberOfForecastsInTube" numbers.
- Set to zero (present to keep the length of section 1 constant) (80+N)->334


Notes:

* a forecast may belong to several tubes. In this case, the forecast is associated with the tube whose extreme is closest.

** by order of decreasing distance to the ensemble mean.