Abbreviations and codes used in the observer's diary
Table 5: Code for state of ground without snow or ice (download PDF version)
| Code | Description |
| 0 | Surface of ground dry (without cracks and no appreciable amount of dust or loose sand) |
| 1 | Surface of ground moist |
| 2 | Surface of ground wet (standing water in small or large pools on surface) |
| 3 | Ground flooded |
| 4 | Surface of ground frozen |
| 5 | Glaze on ground |
| 6 | Loose dry dust or sand not covering ground completely |
| 7 | Thin layer of loose dry dust or sand covering the ground completely |
| 8 | Moderate or thick cover of loose dry dust or sand covering ground completely |
| 9 | Extremely dry with cracks |
