| Octet No. | Contents |
|---|---|
| 10 |
Parameter category (see Code table 4.1) |
| 11 |
Parameter number (see Code table 4.2) |
| 12-13 |
Wave direction number |
| 14-15 |
Number of wave directions (ND) |
| 16-17 |
Wave frequency number |
| 18-19 |
Number of wave frequencies (NF) |
| 20 |
Type of generating process (see Code table 4.3) |
| 21 |
Background generating process identifier (defined by originating center) |
| 22 |
Analysis or forecast generating process identifier (defined by originating center) |
| 23-24 |
Hours of observational data cut-off after reference time (see Note 1) |
| 25 |
Minutes of observational data cut-off after reference time |
| 26 |
Indicator of unit of time range (see Code Table 4.4) |
| 27-30 |
Forecast time in units defined by previous octet |
| 31 |
Scale factor of wave directions |
| The following entry of 4 octets is repeated ND times. (ND is defined in octets 14-15) |
|
| 32 + (ND-1)*4 -35 + (ND-1)*4 |
Scaled values of wave directions |
| 36 + (ND-1)*4 |
Scaled factor of wave frequencies (see Note 2) |
| The following entry of 4 octets is repeated NF times. (NF is defined in octets 18-19) |
|
| 37 + (ND-1)*4 + (NF-1)*4 -40 +(ND-1)*4 + (NF-1)*4 |
Scaled values of wave frequencies (see Note 3) |
| Notes: (1) Hours greater than 65534 will be coded as 65534. (2) The units of the wave directions are degree true. (3) The frequencies are defined as 1/T where T is the wave period in seconds. |