SPI | Category |
SPI > 2.0 | Extremely wet |
1.5 SPI 1.99 | Severely wet |
1.0 SPI 1.49 | Moderately wet |
−0.99 SPI 0.99 | Near normal |
−1.0 SPI −1.49 | Moderately drought |
−1.5 SPI −1.99 | Severely drought |
SPI < −2 | Extremely drought |