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.