Table 3 Metrological drought risks classification using SPI value (McKee et al. 1993)
| SPI values | Drought category |
|---|---|
| < − 2.00 and less | Extreme drought |
| − 1.50 to − 1.99 | Severe drought |
| − 1.00 to − 1.49 | Moderate drought |
| 0 to − 0.99 Near | Normal or mild drought |
| Above 0 | No drought |