| Code Figure | Meaning |
|---|---|
| 0 | Anomaly (see Note 1) |
| 1 |
Standardized Anomaly (see Note 1) |
| 2 | Significance (Wilcoxon-Mann-Whitney) (see Note 2) |
| 3 |
Climatology |
| 4-19 |
Reserved |
| 20 | Extreme Forecast Index (EFI) (see Note 3) |
| 21 |
Shift of Tails (SOT) (see Note 4) |
| 22 |
Anomaly of probabilities (see Note 5) |
| 23 |
Standardized Drought Index (see Note 6) |
| 24-191 |
Reserved |
| 192-254 |
Reserved for Local Use |
| 255 | Missing |
| Notes: (1) No additional parameter needed, NA in templates 4.105, 4.106 and 4.107 should be set to 0. (2) Confidence interval for the significance test is needed (NA=1). (3) FI is defined in https://doi.org/10.1256/qj.02.152. No additional parameter needed (NA=0). (4) OT is defined in https://doi.org/10.1256/qj.02.152. Lower and upper quantile used for the SOT need to be defined (NA=2) in this order: start of the tail (10 or 90 usually) then end of tail (1 or 99 respectively). (5) This entry is intended to be used with templates 4.112 and 4.123. Instead of having the probability of the exceedance of the anomaly (code number 0) of the limits specified in the message, it specifies probabilities which were calculated for the forecast and for the reference dataset with the given specification listed in the meta-data. The anomaly is calculated between the two derived probabilities. (6) Descriptions of the drought indices in discipline 0, meteorology, category 22 are available in the Handbook of Drought Indicators and Indices (WMO-No. 1173) [https://library.wmo.int/idurl/4/55169]. The indices are specified by setting discipline and parameter category/number to the specific index to be encoded. Drought indicators are calculated over different time ranges, prescribed by the 'Length of time range' and 'Indicator of unit for time range' parameters in the templates 4.107, 4.108, 4.109 and 4.112. All standardized drought indices are calculated according to the Standardized Precipitation Index User Guide (WMO-No. 1090)[https://library.wmo.int/idurl/4/39629]. |