Table 1 SPI and SPEI drought category classification111.
From: Assessing the impacts of agricultural drought (SPI/SPEI) on maize and wheat yields across Hungary
Drought group | SPI threshold | SPEI threshold |
|---|---|---|
Near normal (ND) | − 1.0 ≤ SPI ≤ 1.0 | − 1.0 ≤ SPEI ≤ 1.0 |
Moderate drought (MD) | − 1.49 < SPI < − 1.0 | − 1.42 < SPEI < − 1.0 |
Severe drought (SD) | − 2.0 < SPI < − 1.5 | − 1.82 < SPEI < − 1.43 |
Extreme drought (ED) | SPI ≤ –2.0 | SPEI ≤ –1.83 |
