| |
Ranges
|
|
Category
|
Description
|
Possible Impacts
|
Palmer Drought Index
|
CPC Soil
Moisture Model
(Percentiles)
|
USGS Weekly Streamflow
(Percentiles)
|
Standardized Precipitation Index (SPI)
|
Objective Short and Long-term Drought Indicator Blends (Percentiles)
|
|
D0
|
Abnormally
Dry
|
Going into drought: short-term dryness slowing planting, growth of crops or pastures. Coming out of drought: some lingering water deficits; pastures or crops not fully recovered
|
-1.0 to -1.9
|
21-30
|
21-30
|
-0.5 to -0.7
|
21-30
|
|
D1
|
Moderate Drought
|
Some damage to crops, pastures; streams, reservoirs, or wells low, some water shortages developing or imminent; voluntary water-use restrictions requested
|
-2.0 to -2.9
|
11-20
|
11-20
|
-0.8 to -1.2
|
11-20
|
|
D2
|
Severe
Drought
|
Crop or pasture losses likely; water shortages common; water restrictions imposed
|
-3.0 to -3.9
|
6-10
|
6-10
|
-1.3 to -1.5
|
6-10
|
|
D3
|
Extreme Drought
|
Major crop/pasture losses; widespread water shortages or restrictions
|
-4.0 to -4.9
|
3-5
|
3-5
|
-1.6 to -1.9
|
3-5
|
|
D4
|
Exceptional Drought
|
Exceptional and widespread crop/pasture losses; shortages of water in reservoirs, streams, and wells creating water emergencies
|
-5.0 or less
|
0-2
|
0-2
|
-2.0 or less
|
0-2
|
| |
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