Geoenvironmental Disasters

Table 1 The SPI Drought classification (McKee et al. 1993)

From: Impact of climate change on the severity, duration, and frequency of drought in a semi-arid agricultural basin

Values of SPI	SPI category
≥2	Extremely wet
1.5–1.99	Severely wet
1–1.49	Moderately wet
-0.99 to +0.99	Normal
-1.49 to -1	Moderately drought
-1.99 to -1.5	Severely drought
≤-2	Extremely drought

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