Index

Non-drought

Mild-drought

Moderate drought

Severe drought

Extreme drought

SPI

−0.5 < SPI

−1.0 < SPI ≤ −0.5

−1.5 < SPI ≤ −1.0

−2.0 < SPI ≤ −1.5

SPI ≤ −2.0

SPEI

−0.5 < SPEI

−1.0 < SPEI ≤ −0.5

−1.5 < SPEI ≤ −1.0

−2.0 < SPEI ≤ −1.5

SPEI ≤ −2.0