Moisture / Drought Maps
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Current Conditions
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Forecast
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Image Archive
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Data Archive
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NFDRS Dead Fuel Moisture
- 10-h, ½" diameter
- 100-h, 1-3" diameter
- 1000-h, 3-8" diameter
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US48 | AK
US48 | AK
US48 | AK
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US48
US48 |
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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.
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.