| 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 |
Type of ensemble forecast (see Code Table 4.6) |
| 32 |
Perturbation Number |
| 33 |
Number of forecasts in ensemble |
| 34 |
Type of wave direction sequence (see Code Table 4.251) |
| 35 |
Number of wave direction sequence parameters (NDSP) |
| The next two entries are repeated NDSP times to encode the scale factors and scaled values of the sequence parameters. |
|
| 36 + (NDSP-1)*5 |
Scaled factor of wave direction sequence parameter |
| 37+(NDSP-1)*5 - 40+(NDSP-1)*5 |
Scaled value of wave direction sequence parameter (see Note 2) |
| 36+NDSP*5 |
Type of wave frequency sequence (see Code Table 4.251) |
| 37+NDSP*5 |
Number of wave frequency sequence parameters |
| The next two entries are repeated NFSP times to encode the scale factors and scaled values of the sequence parameters |
|
| 38+NDSP*5+(NFSP-1)*5 |
Scale factor of wave frequency sequence parameter |
| 39+NDSP*5+(NFSP-1)*5 -42+NDSP*5+(NFSP-1)*5 | Scaled value of wave frequency sequence parameter (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. |