Table 2 The drought/wet classification catalog

W4

[2, + ∞]

Exceptionally wet

W3

[1.6, 1.99]

Extremely wet

W2

[1.3, 1.59]

Severe wet

W1

[0.8, 1.29]

Moderately wet

W0

[0.5, 0.79]

Slight wet

WD

[–0.49, 0.49]

Near normal

D0

[–0.79, –0.5]

Abnormal drought

D1

[–1.29, –0.8]

Moderate drought

D2

[–1.59, –1.3]

Severe drought

D3

[–1.99, –1.6]

Extremely drought

D4

(–∞, –2]

Exceptional drought