Haines Index

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Haines Index is a weather index developed by meteorologist Donald Haines in 1988 that measures the potential for dry, unstable air to contribute to the development of large or erratic wildland fires. The index is derived from the stability (temperature difference between different levels of the atmosphere) and moisture content (dew point depression) of the lower atmosphere. This data may be acquired with a radiosonde or simulated by a numerical weather prediction model. The index is calculated over three ranges of atmospheric pressure: low elevation (950-850 millibars (mb)), mid elevation (850-700 mb), and high elevation (700-500 mb).^[1]

A Haines Index of 6 means a high potential for an existing fire to become large or exhibit erratic fire behavior, 5 means medium potential, 4 means low potential, and anything less than 4 means very low potential.

References

http://www.publish.csiro.au/?paper=WF06086

↑ Noaa

v t e Meteorological data and variables

General	Adiabatic processes Lapse rate Lightning Surface solar radiation Surface weather analysis Visibility Vorticity Wind

Condensation	Cloud Cloud condensation nuclei Fog Lifted condensation level (LCL) Precipitation Water vapor

Convection	Convective available potential energy (CAPE) Convective inhibition (CIN) Convective instability Convective temperature (T_c) Equilibrium level (EL) Helicity Level of free convection (LFC) Lifted index (LI) Bulk Richardson number (BRN)

Temperature	Dew point (T_d) Equivalent temperature (T_e) Forest fire weather index Haines Index Heat index Humidex Humidity Potential temperature (θ) Equivalent potential temperature (θ_e) Sea surface temperature (SST) Wet-bulb temperature Wet-bulb potential temperature Wind chill

Pressure	Atmospheric pressure Baroclinity Barotropicity

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Haines Index

References

See also