Table 2 Drought classification for the SPEI.

From: Assessing arid Inland Lake Watershed Area and Vegetation Response to Multiple Temporal Scales of Drought Across the Ebinur Lake Watershed

Drought class

SPEI value

Extreme wet

SPEI > 2.0

Severe wet

1.5 < SPEI ≤ 2.0

Moderate wet

1.0 < SPEI ≤ 1.5

Normal

−1.0 < SPEI ≤ 1.0

Moderate drought

−1.5 < SPEI ≤ −1.0

Severe drought

−2.0 < SPEI ≤ −1.5

Extreme drought

SPEI ≤ −2

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