Table 2 Proposed transformation of probabilities into drought categories.
SDI | Probability | McKee (1993)28 | Agnew (2000)83 | U.S. Drought Monitor (2002)84 |
|---|---|---|---|---|
<−2.00 | 0.023 | Extreme |  | Exceptional (D4) |
<−1.65 | 0.050 |  | Extreme | Extreme (D3) |
<−1.50 | 0.067 | Severe |  |  |
<−1.28 | 0.100 |  | Severe | Severe (D2) |
<−1.00 | 0.159 | Moderate |  |  |
<−0.84 | 0.200 |  | Moderate | Moderate (D1) |
<−0.50 | 0.300 |  |  | Abnormally dry (D0) |
<0.00 | 0.500 | Mild | No drought | Â |
