Selecting Probabilistic from the Simulation Mode menu will expand the bottom of the FireSim panel to include Probabilistic inputs.
Probabilistic mode provides the ability to adjust variability on four inputs:
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Wind Direction (degrees)
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Wind Speed (mph)
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1hr Fuel Moisture (%)
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Live Woody & Herbaceous Fuel Moisture (%)
A range of acceptable values is displayed in each field. Key in values for the inputs you would like to use and set the others to zero.
Probabilistic mode uses a Monte Carlo method to run fifty simulations using the input data and will overlay all simulation outputs together to create a probabilistic surface.
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The legend at the bottom of the results panel shows that 80% or more of the simulations impact the area in red. 60% of the simulations will impact the area in orange, 40% for green, 20% for blue, etc, given the variables entered.