GRIB2 - PRODUCT DEFINITION TEMPLATE 4.136

Probability forecasts of anomalies, significance and other derived products in relation to a reference period
with spatiotemporal processing based on focal (moving window) statistics in relation to a reference period
at a horizontal level or in at a point in time

Created 09/26/2025


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 18
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
Number of forecasts in ensemble
40
Forecast probability number
41
Total number of forecast probabilities
42
Probability type (see Code table 4.9)
43
Scale factor of lower limit
44-47
Scaled value of lower limit
48
Scale factor of upper limit
49-52
Scaled value of upper limit
53
Type of reference dataset (see Code table 4.100)
54
Type of relation to reference dataset (see Code table 4.101)
55
Number of additional parameters for reference period (NA) (see Note 2)

The next two entries are repeated NA times na=0:NA - can be 0 times if no parameters are necessary
56+(na-1)*5
Scale factor of additional parameters for reference period
(57+(na-1)*5)-(60+(na-1)*5)
Scaled value of additional parameters for reference period

End of repeated NA sequence
(56+NA*5)-(57+NA*5)
Year of start of reference period
58+NA*5
Month of start of reference period
59+NA*5
Day of start of reference period
60+NA*5
Hour of start of reference period
61+NA*5
Minute of start of reference period
62+NA*5
Second of start of reference period
(63+NA*5)-(66+NA*5)
Sample size of reference period
67+NA*5
Number of reference period time range (NR) (see Note 3)

The next three entries are repeated NR times nr=1:NR
68+NA*5+(nr-1)*6
Type of statistical processing for time range for reference period (see Code table 4.102)
69+NA*5+(nr-1)*6
Indicator of unit of time range for reference period (see Code table 4.4)
(70+NA*5+(nr-1)*6)-(73+NA*5+(nr-1)*6)
Length of time range for reference period

End of repeated NR sequence
74+NA*5+(nr-1)*6
Spatial vicinity type (see Code table 4.103)
75+NA*5+(nr-1)*6
Number of spatial vicinity values (NSV)

The next entry repeats nsv=1:NSV times
(76+NA*5+(nr-1)*6+(nsv-1)*4)-(79+NA*5+(nr-1)*6+(nsv-1)*4)
Spatial vicinity value
80+NA*5+(nr-1)*6+(nsv-1)*4
Spatial vicinity processing (see Code table 4.104)
(81+NA*5+(nr-1)*6+(nsv-1)*4)-(82+NA*5+(nr-1)*6+(nsv-1)*4)
Spatial vicinity processing argument 1 (e.g., if previous is quantile)
(83+NA*5+(nr-1)*6+(nsv-1)*4)-(84+NA*5+(nr-1)*6+(nsv-1)*4)
Spatial vicinity processing argument 2 (e.g., if previous is quantile)
85+NA*5+(nr-1)*6+(nsv-1)*4
Spatial vicinity missing data (see Code table 4.105)
86+NA*5+(nr-1)*6+(nsv-1)*4
Temporal vicinity processing (see Code table 4.104)
87+NA*5+(nr-1)*6+(nsv-1)*4
Temporal vicinity unit (see Code table 4.4)
(88+NA*5+(nr-1)*6+(nsv-1)*4)-(91+NA*5+(nr-1)*6+(nsv-1)*4)
Temporal vicinity towards past
(92+NA*5+(nr-1)*6+(nsv-1)*4)-(95+NA*5+(nr-1)*6+(nsv-1)*4)
Temporal vicinity towards future


Notes:

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

(2)  See notes under Code table 4.101 for details.

(3)  'Number of reference period time range' is used to define an outer and, if needed, one or more inner loops. The outer loop gives the overall date and time range of the reference period and the inner loop(s) specify a sub-period over all time instances defined in the outer loop in terms of the time unit defined by 'Reference period indicator of unit for time increment'. Typically the outer loop defines a number of years and inner loop defines the date and time range within each year: for instance 'every January for 30 years'.


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