Taryn Finnessey
303-866-3441 x3231
Drought Indices

Given the complex nature of drought is difficult to determine its progress from a single physical measurement. Drought indices assimilate one or more drought-related variables into a single index score.

These indices are the primary tools used by the State in assessing drought severity. As part of the 2010 Drought Mitigation Plan update the Surface Water Supply Index (SWSI) has been modernized and the Colorado Modified Palmer Drought Severity Index (CMPDSI) was validated as a useful index for Colorado. The indices are described below.

 Primary Drought Indices

Expand/Collapse Title : Colorado Modified Palmer Drought Severity Index ‎(1)
Expand/Collapse Title : Palmer Drought Severity Index (PDSI) ‎(1)
Expand/Collapse Title : Revised Surface Water Supply Index (SWSI) ‎(2)
Expand/Collapse Title : Standard Precipitation Index (SPI) ‎(1)

 Secondary Drought Indices

Expand/Collapse Title : Colorado Monthly Precipitation and Percent of Normal Maps ‎(1)
Expand/Collapse Title : Crop Moisture Index ‎(1)
Expand/Collapse Title : Keetch-Byram Soil Moisture Index ‎(1)
Expand/Collapse Title : U.S. Drought Monitor ‎(1)