| Octet No. | Contents |
|---|---|
| 10 | Parameter category (see Code Table 4.1) |
| 11 | Parameter number (see Code Table 4.2) |
| 12-13 | Input process identifier (see Note 1) |
| 14-15 | Input originating centre (see Common Code table C–11 and Note 2) |
| 16 | Type of post-processing (see Note 3) |
| 17 | Type of generating process (see Code Table 4.3) |
| 18 |
Background generating process
identifier (defined by originating centre) |
| 19 |
Forecast generating process identified
(see Code ON388 Table A) |
| 20-21 | Hours after reference time of data cut-off (see Note 4) |
| 22 |
Minutes after reference time
data cutoff |
| 23 | Indicator of unit of time range (see Code Table 4.4) |
| 24-27 |
Forecast time in units defined
by octet 23 |
| 28 | Type of first fixed surface (see Code Table 4.5) |
| 29 |
Scale factor of first fixed surface |
| 30-33 |
Scaled value of first fixed
surface |
| 34 | Type of second fixed surfaced (see Code Table 4.5) |
| 35 |
Scale factor of second fixed
surface |
| 36-39 |
Scaled value of second fixed
surfaces |
| 40 | Type of ensemble forecast (see Code table 4.6) |
| 41 | Perturbation number |
| 42 | Number of forecasts in ensemble |
| 43-44 | Year ― Time of end of overall time interval |
| 45 | Month ― Time of end of overall time interval |
| 46 | Day ― Time of end of overall time interval |
| 47 | Hour ― Time of end of overall time interval |
| 48 | Minute ― Time of end of overall time interval |
| 49 | Second ― Time of end of overall time interval |
| 50 | n ― number of time range specifications describing the time intervals used to calculate the statistically-processed field |
| 51-54 | Total number of data values
missing in the statistical process |
| 55-66 Specification of the outermost (or only) time
range over which statistical processing is done |
|
| 55 | Statistical process used to
calculate the processed field from the field at each time increment
during the time range (see Code Table 4.10) |
| 56 | Type of time increment between successive fields used in the statistical processing (see Code Table 4.11) |
| 57 | Indicator of unit of time range
over which statistical processing is done (see Code Table 4.4) |
| 58-61 |
Length of the time range over
which statistical processing is done, in units defined by the previous
octet |
| 62 | Indicator of unit of time for
the increment between the successive fields used (see Code Table 4.4) |
| 63-66 | Time increment between
successive fields, in units defined by the previous octet (see Notes 6 and 7) |
| 67-nn These octets are included only if n>1, where nn = 54 +12 x n | |
| 67-78 | As octets 55 to 66, next innermost step of processing |
| 79-nn | Additional time range specifications, included in accordance with the value of n, Contents as octets 55 to 66, repeated as necessary. |
| Note: (1) The input process identifier shall have the value of the “analysis or forecast process identifier” of the original GRIB message used as input of the post-processing. (2) The input originating centre shall have the value of the “originating centre” of the original GRIB message used as input of the post-processing. (3) This identifies which post-processing technique was used. This is defined by the originating centre. (4) Hours greater than 65534 will be coded as 65534. (5) The reference time in section 1 and the forecast time together define the beginning of the overall time interval. (6) An increment of zero means that the statistical processing is the result of a continuous (or near continuous) process, not the processingeof a number of discrete samples. Examples of such continuous processes are the temperatures measured by analogue maximum and minimum thermometers or thermographs, and the rainfall measured by a rain gauge. (7) The reference and forecast times are successively set to their initial values plus or minus the increment, as defined by the type of time increment (one of octets 56, 68, 80, ...). For all but the innermost (last) time range, the next inner range is then processed using these reference and forecast times as the initial reference and forecast times. |