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Table 1

Drought classification based on the SPI and SPEI (source: McKee et al. 1993)

Drought categorySPI, SPEI values
Non-drought Index value >0 
Mild drought –1.0 > Index value > 0 
Moderate drought –1.5 > Index value > –1.0 
Severe drought –2.0 > Index value > –1.5 
Extreme drought Index value > –2.0 
Drought categorySPI, SPEI values
Non-drought Index value >0 
Mild drought –1.0 > Index value > 0 
Moderate drought –1.5 > Index value > –1.0 
Severe drought –2.0 > Index value > –1.5 
Extreme drought Index value > –2.0 
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