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HOME > U.S. Drought > Drought Indices: Standardized Runoff Index (12-Month)

Drought Indices
Standardized Runoff Index
3-Month 6-Month 12-Month
Topo Map
12 Month Runoff Index Ensemble
12 Month Runoff Index Mosaic
12 Month Runoff Index NOAH
12 Month Runoff Index SAC
 12 Month Runoff Index VIC
Notes about this product:
  • Drought classification: D1 -0.8 > SRI > -1.2; D2 -1.3 > SRI > -1.5; D3 -1.6 > SRI > -1.8; and D4 SRI < -2.
  • Data source: North American Land Data Assimilation System (NLDAS)
  • GeoTIFF: Undefined value is -999.
Related Links:
Contacts: Kingtse Mo ( & Li Xu (

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Page Author: Climate Prediction Center Internet Team
Page last modified: Aug 19, 2016
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