Underburn

n. A fire in a forest stand of low to moderate fireline intensity that remains a surface fire.

 

  • Discussion

 

An underburn is defined as a fire that is constrained to surface fuel and therefore has a low to moderate fireline intensity (less than 300 kW/m).  Underburns are commonly prescribed for dry forest types such as ponderosa pine or mixed conifer to reduce fuel but leave the overstory intact.  Underburns are usually classified as low-severity fires.