× NIDIS Weekly Summary Precipitation Snow Streamflow Surface Water Evaporative Demand Impacts Reports Outlook Composite Drought
Evaluator eXperiment (CoDEX)
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NIDIS Intermountain West
Drought Early Warning System
August 7, 2018

North Platte
HUC 4 1018
VariableD-Category
Current USDM D0
Blended CoDEX D0
30-Day SPI -
90-Day SPI -
180-Day SPI -
Snowpack D0
Soil -
Streamflow D0
1mo EDDI D1
3mo EDDI D2
VegDRI NA
Impacts NA
South Platte
HUC 4 1019
VariableD-Category
Current USDM D1
Blended CoDEX D0
30-Day SPI -
90-Day SPI -
180-Day SPI -
Snowpack D0
Soil -
Streamflow -
1mo EDDI D2
3mo EDDI D3
VegDRI NA
Impacts D0
Republican
HUC 4 1025
VariableD-Category
Current USDM D1
Blended CoDEX D0
30-Day SPI -
90-Day SPI D0
180-Day SPI -
Snowpack NA
Soil -
Streamflow -
1mo EDDI D1
3mo EDDI D3
VegDRI NA
Impacts D1
Upper Arkansas
HUC 4 1102
VariableD-Category
Current USDM D1
Blended CoDEX D1
30-Day SPI -
90-Day SPI D2
180-Day SPI -
Snowpack D3
Soil -
Streamflow D0
1mo EDDI D3
3mo EDDI D3
VegDRI NA
Impacts D1
Rio Grande Headwaters
HUC 4 1301
VariableD-Category
Current USDM D2
Blended CoDEX D2
30-Day SPI D1
90-Day SPI D3
180-Day SPI D1
Snowpack D3
Soil NA
Streamflow -
1mo EDDI D3
3mo EDDI D4
VegDRI NA
Impacts D3
Colorado Headwaters
HUC 4 1401
VariableD-Category
Current USDM D2
Blended CoDEX D1
30-Day SPI -
90-Day SPI D1
180-Day SPI D1
Snowpack D2
Soil NA
Streamflow D0
1mo EDDI D2
3mo EDDI D3
VegDRI NA
Impacts D1
Gunnison
HUC 4 1402
VariableD-Category
Current USDM D2
Blended CoDEX D2
30-Day SPI -
90-Day SPI D2
180-Day SPI D2
Snowpack D3
Soil NA
Streamflow -
1mo EDDI D2
3mo EDDI D4
VegDRI NA
Impacts D1
Dolores
HUC 4 1403
VariableD-Category
Current USDM D2
Blended CoDEX D2
30-Day SPI -
90-Day SPI D3
180-Day SPI D3
Snowpack D3
Soil D1
Streamflow D0
1mo EDDI D3
3mo EDDI D4
VegDRI NA
Impacts D3
Upper Green
HUC 4 1404
VariableD-Category
Current USDM D0
Blended CoDEX D0
30-Day SPI -
90-Day SPI -
180-Day SPI -
Snowpack -
Soil -
Streamflow -
1mo EDDI D1
3mo EDDI D1
VegDRI NA
Impacts NA
White-Yampa
HUC 4 1405
VariableD-Category
Current USDM D1
Blended CoDEX D1
30-Day SPI -
90-Day SPI D1
180-Day SPI D1
Snowpack D2
Soil NA
Streamflow -
1mo EDDI D2
3mo EDDI D3
VegDRI NA
Impacts D0
Lower Green
HUC 4 1406
VariableD-Category
Current USDM D2
Blended CoDEX D1
30-Day SPI -
90-Day SPI D1
180-Day SPI D1
Snowpack D3
Soil D2
Streamflow -
1mo EDDI D2
3mo EDDI D3
VegDRI NA
Impacts NA
Dirty Devil
HUC 4 1407
VariableD-Category
Current USDM D2
Blended CoDEX D2
30-Day SPI -
90-Day SPI D2
180-Day SPI D3
Snowpack D3
Soil D3
Streamflow -
1mo EDDI D4
3mo EDDI D4
VegDRI NA
Impacts NA
San Juan
HUC 4 1408
VariableD-Category
Current USDM D2
Blended CoDEX D3
30-Day SPI D0
90-Day SPI D3
180-Day SPI D3
Snowpack D3
Soil D3
Streamflow D1
1mo EDDI D4
3mo EDDI D4
VegDRI NA
Impacts D2

The Composite Drought Evaluator eXperiment (CoDEX) is an experimental product, produced by the Colorado Climate Center, that is designed to work as an indicator of predominant conditions within certain regions of the Intermountain West. It is a composite blend of different hydrologic indicators, which are assigned values consistent with U.S. Drought Monitor drought categories.

  • Yellow: blends in a drought category (D0-D4) that is consistent with USDM depiction.
  • Orange: blends worse than USDM and could be considered for degradations.
  • Green: blends better than USDM and could be considered for improvements.
  • White: Neither blends nor USDM show drought categories.

Data Sources:

This product is experimental and is for informational purposes only. It does not dictate what the U.S. Drought Monitor may look like in the future, and may not be a major source of information for the NIDIS Intermountain West DEWS webinars either.