Table 2 Wet and drought classification based on SPEI/SRI.

From: Spatiotemporal patterns and propagation of meteorological and hydrological drought in a humid basin of Southeast China

Value range

Classification

Value range

Classification

≥2.0

Extremely wet

−1.0 to − 0.5

Slightly dry

1.5 to 2.0

Severely wet

−1.5 to − 1.0

Moderately dry

1.0 to 1.5

Moderately wet

−2.0 to − 1.5

Severely dry

0.5 to 1.0

Slightly wet

≤−2.0

Extremely dry

−0.5 to 0.5

Normal

  
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