Section 1 - Code Table 4 : Type of data
Code Tables for Section 1
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| Code | Meaning |
| 0 | Analysis products |
| 1 | Forecast products |
| 2 | Analysis and forecast products |
| 3 | Control forecast products |
| 4 | Perturbed forecast products |
| 5 | Control and perturbed forecast products |
| 6 | Processed satellite observations |
| 7 | Processed radar observations |
| 8 | Event probability |
| 255 | Missing |
( 1) An initialized analysis is considered a zero-hour forecast