Table 2 The range of SPI values.

From: Examination of hydrological variations and their effect on water shortage trends and water-energy production using convolutional neural network and ISSA

SPI value range

Drought category

SPI > 2.0

Extremely wet

1.5 < SPI ≤ 2.0

Very wet

1.0 < SPI ≤ 1.5

Moderately wet

-1.0 < SPI ≤ 1.0

Near normal

-1.5 < SPI ≤ -1.0

Moderately dry

-2.0 < SPI ≤ -1.5

Severely dry

SPI ≤ -2.0

Extremely dry

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