How to Use the 2-Index System for Rating Forest Fire Danger (Classic Reprint) - Hardcover

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Excerpt from How to Use the 2-Index System for Rating Forest Fire Danger

Drought-index calculations start in spring when the winter's snow melts or, in the event of an open winter, when average daily temperatures regularly reach 50° F. Or more. The decision to begin calculating is based on conditions in timbered areas large enough that the drying of dead fuels would create a fire hazard.

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