Table 2 SPEI classification into classes and macro classes.
From: Complex drought patterns robustly explain global yield loss for major crops
Value classification | Class description | Macro class |
|---|---|---|
SPEI ≤ − 2 | Extremely Dry (ED) | Dry (D) |
− 2.0 < SPEI ≤ − 1.5 | Severely Dry (SD) | |
− 1.5 < SPEI ≤ − 1.0 | Moderately Dry (MD) | |
− 1.0 < SPEI < 1.0 | Normally Dry to Wet (N) | Normal (N) |
1.0 ≤ SPEI < 1.5 | Moderately Wet (MW) | Wet (W) |
1.5 ≤ SPEI < 2.0 | Severely Wet (SW) | |
SPEI ≥ 2.0 | Extremely Wet (EW) |
