Analysis of Droughts in the Central Region of South Africa and Their Association with SST Anomalies

Table 1

Classification of SPEI values.

SPEI class	Class description
SPEI ≤ −2	Extremely dry
−2 < SPEI ≤ −1.5	Severely dry
−1.5 < SPEI ≤ −1	Moderately dry
−1 < SPEI ≤ 0	Mild drought
0 < SPEI ≤ 1	Near normal wet
1 < SPEI ≤ 1.5	Moderately wet
1.5 < SPEI ≤ 2	Very wet
SPEI > 2	Extremely wet

Source: [28].