GRIB2 - PRODUCT DEFINITION TEMPLATE 4.154

Individual large ensemble reforecast, control and perturbed,
at a horizontal level or in a horizontal layer at a point in time

Created 11/20/2025


Octet No. Contents
10
Parameter category (see Code table 4.1)
11
Parameter number (see Code table 4.2)
12
Type of generating process (see Code table 4.3)
13
Background generating process identifier (defined by originating centre)
14
Analysis or forecast generating process identifier (see ON388 Table A)
15-16
Hours of observational data cut-off after reference time (see Note 1)
17
Minutes of observational data cut-off after reference time
18
Indicator of unit of time range (see Code table 4.4)
19-22
Forecast time in units defined by octet 20
23
Type of first fixed surface (see Code table 4.5)
24
Scale factor of first fixed surface
25-28
Scaled value of first fixed surface
29
Type of second fixed surface (see Code table 4.5)
30
Scale factor of second fixed surface
31-34
Scaled value of second fixed surface
35
Type of ensemble forecast (see Code table 4.6)
36-39
Perturbation number
40-43
Number of forecasts in ensemble
44-45
Year of model version date (see Note 2)
46
Month of model version date
47
Day of model version date
48
Hour of model version date
49
Minute of model version date
50
Second of model version date


Notes:

(1)  Hours greater than 65534 will be coded as 65534

(2)  This is the date when the reforecast is produced with a particular version of the model.


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