SPI | Drought event |
2.0+ | Extremely wet |
1.5 - 1.99 | Very wet |
1.0 - 1.49 | Moderately wet |
−0.99 - 0.99 | Near normal |
−0.1 - 1.49 | Moderately dry |
−1.5 - 1.99 | Severely dry |
−2 and less | Extremely dry |