High humidity and /or rainfall can retard combustion and fire spread by keeping fuels moist . Conversely , dry air evaporates moisture from fuels , making them more susceptible to combustion . 2 .3 Topography The topography of slope , both angle and orientation can significantly affect fire spread . Slope increases flame contact with uphill fuels , thereby more rapidly heating them and increasing combustion potential . Therefore , the fire burns more intensely and quickly . Uphill winds accelerate this process , as do slopes that face the drying...
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