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Surface Fire Size and Shape

These tools are intended for use with initiating fires only. Use them using the known ignition time and the number of hours after that you are interested in.  Consider using:

  • number of hours from ignition until the end of the expected burn period
  • number of hours until you arrive at the fire

Surface Fire Shape

Remember that effective windspeed, as referenced here, is based on midflame windspeed. 

Length to Width Ratio in parenthesis

Surface Fire Elliptical Shape

Surface Fire Area Estimation from Point Source Fire, in Acres

Table 1, Spread Distance 1-50 Chains

Surface Fire Area, Table 1

Table 2, Spread Distance 52-165

Surface Fire Area, Table 2