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Potential Fire Characteristics, v1999

When flame lengths exceed eight feet, fires present serious control problems such as torching out, crowning, and spotting. Control efforts at the head of the fire are mostly ineffective and major runs can occur in more extreme cases.

The maximum annual number of days where potential flame lengths exceeded 8 feet were calculated for 4th-code hydrologic units (HUCs) using indices acquired from the existing National Fire Danger Rating System (NFDRS) weather observation network and primary fuel model assignments. Potential flame lengths were derived from 180 days of NFDRS burning index (BI) data, April - September, for each of eight years, 1989 - 1996.


Modified: Mar 11, 2014