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Palmer Drought Index |
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Precipitation |
Groundwater |
Streamflow |
Reservoirs |
Severity |
Crop Moisture |
Fire Danger |
| ADVISORY |
2 months (cumulative) below %65 of normal |
3 consecutive months below normal * |
2 out of 3 months below normal * |
Average levels less than 80% of normal |
-2.0 to -2.99 |
-1.0 to –1.99 abnormally dry, |
Moderate |
| WATCH |
3 months cumulative below 65% of normal |
4 consecutive months below normal * |
4 out of 5 months below normal * |
Average levels less than 70% of normal |
-3.0 to -3.99 |
-2.0 to –2.99 excessively dry |
High |
| WARNING |
More than 4months cumulative below 65% of normal, |
4 consecutive months below normal * |
6 out of 7 months below normal * |
Average levels less than 60% of normal. |
-4 or less |
-3 or less |
Very high |
| EMERGENCY |
More than 6 months cumulative below 65% of normal |
8 consecutive months below normal * |
7 months below normal * |
Average levels less than 50% of normal or less than 50 days of supply |
-4 or less. |
-3 or less, severely dry |
Extreme |
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| * Normal levels for Groundwater and Streamflow are defined as the 25th percentile of the period of record. |