Local definition 10: EPS tubes

Local definitions

Octets Key Type Contents
41 localDefinitionNumber unsigned ECMWF local GRIB use definition identifier. 10 = EPS tubes.
42 class codetable Class
43 type codetable Type
44-45 stream codetable Stream
46-49 experimentVersionNumber ksec1expver Version number or experiment identifier. (4 ASCII characters, right justified)
50 tubeNumber unsigned Tube number (0=central cluster)
51 totalNumberOfTubes unsigned Total number of tubes (excluding central cluster)
52 centralClusterDefinition unsigned Central cluster definition 1: radius = % of total variance 2: radius = predefined value
53 parameterIndicator unsigned Indicator of parameter considered (see code table 2 in section 1)
54 levelIndicator unsigned Indicator of type of level considered (see WMO code table 3)
55-57 northLatitudeOfDomainOfTubing signed Northern latitude of the domain of tubing
58-60 westLongitudeOfDomainOfTubing signed Western longitude of the domain of tubing
61-63 southLatitudeOfDomainOfTubing signed Southern latitude of the domain of tubing
64-66 eastLongitudeOfDomainOfTubing signed Eastern longitude of the domain of tubing
67 numberOfOperationalForecastTube unsigned Number of tube to which the operational forecast belongs(*) 0 = central cluster, 254 = does not belong to any tube
68 numberOfControlForecastTube unsigned Number of tube to which the control forecast belongs(*) 0 = central cluster, 254 = does not belong to any tube
69-70 heightOrPressureOfLevel unsigned Height/pressure of level considered (see WMO code table 3)
71-72 referenceStep unsigned Reference step considered (same units of time as forecast timesteps)
73-74 radiusOfCentralCluster unsigned Radius of central cluster (in units of parameter defined in element 45)
75-76 ensembleStandardDeviation unsigned Ensemble standard deviation (in units of parameter defined in element 45)
77-78 distanceFromTubeToEnsembleMean unsigned 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.
79 numberOfForecastsInTube unsigned Number of forecasts belonging to the tube or central cluster, including the control forecast (N)
80->(79+N) ensembleForecastNumbers unsigned List of N ensemble forecast numbers (**) Order is important, first on the list is the tube extreme
(80+N)->334 Set to zero (present to keep the length of section 1 constant)
Notes:

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

( 2) by order of decreasing distance to the ensemble mean.