Index value | Classification | Probability | Occurrence |
SPI ≥ 2.00 | Extremely wet | 0.977 - 1.000 | 2.3% |
1.50 ≤ SPI < 2.00 | Very wet | 0.933 - 0.977 | 4.4% |
1.00 ≤ SPI < 1.50 | Moderate wet | 0.841 - 0.933 | 9.2% |
−1.00 ≤ SPI < 1.00 | Near normal | 0.159 - 0.841 | 68.2% |
−1.50 ≤ SPI < −1.00 | Moderately drought | 0.067 - 0.159 | 9.2% |
−2.00 ≤ SPI < −1.50 | Severe drought | 0.023 - 0.067 | 4.4% |
SPI < −2.00 | Extremely drought | 0.000 - 0.023 | 2.3% |