Haines Index (HI)

Used to indicate the potential for rapid fire growth, due to dry and unstable atmospheric conditions over a fire area. The index is a simple way to measure the atmosphere’s contribution to the fire’s growth potential. A High Haines Index is correlated with large fire growth, where winds do not dominate fire behavior.

Index Fire’s Growth Potential
2 Very Low Potential (moist and unstable lower atmosphere)
3 Very Low Potential
4 Low Potential
5 Moderate Potential
6 High Potential (dry and unstable lower atmosphere)