| Octet Number | Content |
|---|---|
|
|
Length of the section in octets (21 or N) |
| 5 |
Number of the section (1) |
| 6-7 |
Identification of originating/generating center (See Table 0) (See note 4) |
|
|
Identification of originating/generating subcenter (See Table C) |
|
|
GRIB master tables version number (currently 2) (See Table 1.0) (See note 1) |
| 11 |
Version number of GRIB local
tables used to augment Master Tables (see Table 1.1) |
| 12 |
Significance of reference time
(See Table 1.2) |
| 13-14 |
Year (4 digits) |
| 15 |
Month |
| 16 |
Day |
| 17 |
Hour |
| 18 |
Minute |
| 19 |
Second |
| 20 |
Production Status of Processed
data in the GRIB message (See Table 1.3) |
| 21 |
Type of processed data in this
GRIB message (See Table 1.4) |
| 22-N |
Reserved |
| Notes: 1. Local tables define those parts of the master table which are reserved for local use except for the case described below. In any case, the use of local tables in the messages are intended for non-local or international exchange is strongly discouraged. 2. If octet 10 is set to 255 then only local tables are in use. In this case, the local table version number (octet 11) must not be zero nor missing. Local tables may include entries from the entire range of the tables. 3. If octet 11 is zero, octet 10 must contain a valid master table version number and only those parts of the tables not reserved for local use may be used. 4. If octets 8-9 is zero, Not a sub-center, the originating/generating center is the center defined by octets 6-7. |