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Dead Fuel Moisture - NFDRS PDF

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NFDRS Dead Fuel Moisture


  • 10-h, ½" diameter
  • 100-h, 1-3" diameter
  • 1000-h, 3-8" diameter

 



US48 | AK
US48 | AK
US48 | AK

 



US48
US48
US48

 




US48
US48

 

1000 Hour Dead Fuel Moisture Map Dead fuel moisture responds solely to ambient environmental conditions and is critical in determining fire potential. Dead fuel moistures are classed by timelag. A fuel's timelag is proportional to its diameter and is loosely defined as the time it takes a fuel particle to reach 2/3's of its way to equilibrium with its local environment. Dead fuels in NFDRS fall into four classes:

 

  • 1-h, less than 1/4" diameter.
Fine flashy fuels that respond quickly to weather changes. Computed from observation time temperature, humidity, and cloudiness.
  • 10-h, 1/4 to 1" diameter.
Computed from observation time temperature, humidity, and cloudiness. Or can be an observed value, from a standard set of "10-Hr Fuel Sticks" that are weighed as part of the fire weather observation.
  • 100-h, 1 to 3" diameter.
Computed from 24-hour average boundary condition composed of day length, hours of rain, and daily temperature/humidity ranges.
  • 1000-h, 3 to 8 " diameter.
Computed from a 7-day average boundary condition composed of day length, hours of rain, and daily temperature/humidity ranges.