Research Article

Forecasting Drought Using Multilayer Perceptron Artificial Neural Network Model

Table 1

The SPEI drought category classification provided by McKee et al. [10].

SPEI values Drought classes

≥2Extremely wet
1.5 to 1.99Very wet
1 to 1.49Moderate wet
.99 to −.99Near normal
−1 to −1.49Moderate drought
−1.5 to 1.99Severe drought
−2Extreme drought