Resolution No. 4814 - Laserfiche WebLink

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LOW (dark green). Fuels do not ignite readily from small firebrands, although a more intense heat source, such as lightning, may start many fires in duff or punky wood. Fires in open cured grassland may burn freely a few hours after rain, but woods fires spread slowly by creeping or smoldering, and burn in irregular fingers. There is little danger of spotting. MEDIUM (light green or blue). Fires can start from most accidental causes, but with the exception of lightning fires in some areas, the number of starts is generally Iow. Fires in open-cured grassland will burn briskly and spread rapidly on windy days. Timber fires spread slowly to moderately fast. The average fire is of moderate intensity, although heavy concentrations of fuel, especially draped fuel, may burn hot. Short-distance spotting may occur, but is not persistent. Fires are not likely to become serious, and control is relatively easy. HIGH (yellow), All fine dead fuels ignite readily and fires start easily from most causes. Unattended brush and campfires are likely to escape. Fires spread rapidly and short-distance spotting is common. High-intensity burning may develop on slopes, or in concentrations of fine fuels. Fire may become serious and their control difficult, unless they are attacked successfully while small. VERY HIGH (orange). Fires start easily from all causes and, immediately after ignition, spread rapidly and increase quickly in intensity. Spot fires are a constant danger. Fires burning in light fuels may quickly develop high intensity characteristics such as long-distance spotting and fire whirlwinds when they burn into heavier fuels. EXTREME (red). Fires under extreme conditions start quickly, spread furiously, and burn intensely. All fires are potentially serious. Development into high- intensity burning wilt usually be faster and occur from smaller fires than in the very high danger class. Direct attack is rarely possible, and may be dangerous, except immediately after ignition. Fires that develop headway in heavy slash or in conifer stands may be unmanageable while the extreme burning condition lasts. Under these conditions, the only effective and safe control action is on the flanks until the weather changes or the fuel supply lessens. Fire Potential Index Map This experimental product portrays a more quantitative measure of fire danger than the Fire Danger Classification map discussed above. This map is primarily of interest for fire service professionals and fire researchers. Other Maps The Forest Service website also provides several other types of technical maps which are intended for fire service professionals and fire researchers. These maps and all of the more common maps summarized above can also be found at the FDR (Fire Danger Rating) web page which can be accessed via the search button on the Forest Service Home Page referenced above. Public Review Draft: August 6, 2004 9-11