Percent Fire Severity

Percent Fire Severity (PFS) is three products merged into one. It is a combination product of what was previously (LF 2014 and earlier) known as Percent of Low-severity Fire (PRC_SURFAC), Percent of Mixed-severity Fire (PRC_MIXED), and Percent of Replacement-severity Fire (PRC_REPLAC). Low severity is defined as less than 25 percent average top-kill within a typical fire perimeter for a given vegetation type. Mixed severity is defined as between 25 and 75 percent average top-kill within a typical fire perimeter for a given vegetation type. Replacement severity is defined as greater than 75 percent average top-kill within a typical fire perimeter for a given vegetation type. 

At the release of LF 2016 Remap Percent of Low-severity Fire, Percent of Mixed-severity Fire, and Percent of Replacement-severity Fire were included as attributes in the Biophysical Settings (BPS) product. In calendar year 2024, these 3 products were merged into a single product called Percent Fire Severity (PFS).