Abstract
Some 2088 lightning-caused forest fires that occurred between 1960 and 1971 in northern Idaho are described and analyzed relative to the properties of pattern, central tendency, and spatial variability. Pattern analysis reveals that randomness characterizes both the distribution of total fires and of annual mean areal centers. A model is proposed relating the latitudinal and longitudinal behavior of mean areal centers to shifts in storm tracks and resultant adjustments in fuel-moisture conditions. Rank correlation analysis reveals that northwest shifts in mean areal centers are associated with higher fuel-moisture conditions whereas southeast movements in mean areal centers are related to reduced fuel-moisture conditions. No significant differences were revealed in the variability of the annual standard distances of fire distribution, nor was there any association between temperature and azimuthal adjustments in mean areal centers.
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