Drought Intensity Categorization

The SPI Values

Extreme wet

SPI ≥ 2 +

Severe wet

1.5 < SPI ≤ 2

Moderate wet

1 < SPI < 1.5

Near normal

−1 < SPI ≤ 1

Moderate dry

−1.5 SPI ≤−1

Severe dry

−2 < SPI ≤−1.5

Extreme dry

SPI < −2