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Dissemination
products include the ECMWF local GRIB extensions so that Member
States can differentiate between the forecast products by examining
the stream number in the GRIB header. The 06 UTC and 18 UTC based
forecasts have STREAM number set to 1026, whereas the 12 UTC and 00
UTC based forecasts have the number 1025.
By convention, ECMWF
always uses octet 41 to define which set of local definitions
follow. The set of local definitions for Short Cutoff Daily Archive
fields:
- Table 8.1 GRIB
Section 1 definition for SCDA data
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Octet
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Ksec1
element
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Contents
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41
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37
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ECMWF local GRIB use
definition identifier.
1 = MARS
labelling
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42
43
44-45
46-49
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38
39
40
41
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Class:
1 = Operations
Type:
2 = Analysis
9 = Forecast
Stream:
1026 = SCDA, short
cut-off daily archive (boundary conditions)
Version number or
experiment identifier.
(4 ASCII characters,
right justified)
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