Environmental Systems Research

Table 1 Meteorological drought classification or interpretation by SPEI

From: Meteorological Drought in Northwestern Escarpment of Ethiopian Rift Valley: detection seasonal and spatial trends

Descriptions	SPEI values
Very wet	1.5 to 1.99
Moderately wet	1.00 to 1.49
Mildly wet	0 to 0.99
Mild drought	0 to − 0.99
Moderate drought	− 1.0 to − 1.49
Severe drought	− 1.5 to − 1.99
Extreme drought	<-2

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