Drought Analysis for Kuwait Using Standardized Precipitation Index
Table 1
SPI values classification and the percentage available in the theoretical standard normal distribution and in the time scales selected for the data of Kuwait.
Class
SPI valuea
Percentage in category (%)
SNDb
3-month scale
6-month scale
12-month scale
24-month scale
Extreme wet
>2.0
2.28
1.94
2.13
0.78
0.39
Very wet
1.5 to 1.99
4.4
5.43
6.01
7.75
8.33
Moderate wet
1.0 to 1.49
9.19
6.78
7.75
8.72
10.27
Near normal
0.99 to −0.99
68.26
76.55
70.35
67.64
63.57
Moderate drought
−1.0 to −1.49
9.19
6.01
8.14
6.4
10.27
Severe drought
−1.5 to −1.99
4.4
1.55
3.68
6
6.98
Extreme drought
<
2.28
1.74
1.94
2.71
0.19
SPI categories adopted from Bordi et al. [30].
bStandard normal distribution.
