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Table 3 Metrological drought risks classification using SPI value (McKee et al. 1993)

From: Mapping the spatial and temporal variation of agricultural and meteorological drought using geospatial techniques, Ethiopia

SPI values Drought category
 <  − 2.00 and less Extreme drought
 − 1.50 to − 1.99 Severe drought
 − 1.00 to − 1.49 Moderate drought
0 to − 0.99 Near Normal or mild drought
Above 0 No drought