The Keetch-Byram Drought Index (KBDI) is a tool for estimating fire potential. It is a continuous numerical index ranging from 0-800. Higher values are associated with more days since rainfall and hotter temperatures. For more information on KBDI see: http://www.wfas.net
Sources:Rocky Mountain Research Station. "Wildland Fire Assessment System: Keetch-Byram Drought Index. Accessed on 15 April 2010. Available at http://www.wfas.net