Wildland Fire Behavior. Component 1. Fuel-grass, shrub, timber litter, logging slash. 01-02-S390-VG. STAGE OF VEGETATIVE DEVELOPMENT ________________________________________ Fresh foliage, annuals developing early in growing cycle. Maturing foliage, still developing with full turgor.
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Fuel-grass, shrub, timber litter, logging slash
Fresh foliage, annuals developing early in growing cycle.
Maturing foliage, still developing with full turgor.
Mature foliage, new growth complete and comparable to older perennial foliage.
Entering dormancy, coloration starting, some leaves may have dropped from stem.
Less than 30, treat as a dead fuel.LIVE FUEL MOISTURE
A rating of the probability that a
glowing firebrand will cause a fire.
(ridgetops)Fuel exposure to wind
flat or gentle
slope, near base
of steep mtn.)
Unsheltered (no foliage,
X 100 %
% SLOPE =
RUN IN FEETPERCENT SLOPE
1. Fire is spreading at the flame front.
2. Fire is free burning.
3. Fine fuels control rate of spread.
4. Uniform and continuous fuels.
5. Surface fire.
6. Uniform weather and topography.
Point source model is designated for fires
burning on flat ground or where the wind
is blowing in the direction of the slope plus
or minus 30°.
Calculations with windspeeds less than
2.5 miles per hour are generally too low.
Better predictions result with
windspeeds greater than 2.5 miles
Fire perimeter and shapes are based on
smooth ellipses - actual perimeter of
the fire edge would likely be greater
length and follow topographic relief.
Determination of locations to place crews,
equipment, helicopters and fuel breaks.
Development of the wildland fire
Distance between spot fires to accomplish
Calculating timing of ignition to take
advantage of diurnal weather patterns.
Managing wilderness fires.
Development of escaped fire contingency
The midflame adjusted for the effect
of slope on uphill fire spread.
IS 5 mi/h
When torching trees, piles or wind-
driven surface fires loft firebrands,
which are then carried by the
Indicator of intensity
*Remember flame length is not equal
to flame height.