Standardized Runoff Index (3-Month)
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HOME > U.S. Drought > Drought Indices: Standardized Runoff Index (3-Month)

Drought Indices
Standardized Runoff Index
3-Month 6-Month 12-Month
Topo Map
3 Month Runoff Index Ensemble
3 Month Runoff Index Mosaic
3 Month Runoff Index NOAH
3 Month Runoff Index SAC
3 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-Chuan Chen (

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Page last modified: March 1, 2012
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