![]() Small fires can quickly become large fires and exhibit extreme fire intensity, such as long-distance spotting and fire whirls. The fires will spread rapidly and have a quick increase in intensity, right after ignition. When the fire danger is "very high", fires will start easily from most causes. Fires can become serious and difficult to control unless they are put out while they are still small. Fires will spread easily, with some areas of high-intensity burning on slopes or concentrated fuels. Unattended campfires and brush fires are likely to escape. When the fire danger is "high", fires can start easily from most causes and small fuels (such as grasses and needles) will ignite readily. Fires are still not likely to become serious and are often easy to control. Average fire intensity will be moderate except in heavy concentrations of fuel, which may burn hot. Most wood fires will spread slowly to moderately. If a fire does start in an open, dry grassland, it will burn and spread quickly on windy days. When the fire danger is "moderate" it means fires can start from most accidental causes, but the number of fire starts is usually pretty low. Fires in open, dry grasslands may burn easily a few hours after a rain, but most wood fires will spread slowly, creeping or smoldering. When the fire danger is "low" it means fuels don’t ignite easily from small embers, but a more intense heat source, such as lightning, may start fires in duff or dry rotten wood. The purpose of this is for visitors to understand the current conditions and help mitigate their actions to prevent human-caused wildfires. We use 5 different color-coded levels to help the public understand fire potential. What are the different levels and what do they mean? Many people associate these signs as "Smokey Bear signs" Adjective Ratings are generally posted on signs as visitors enter public lands or at agency offices. The "Adjective Ratings" are a public information description of the relative severity of the current fire danger situation in a general area. Fire behavior deals with an existing fire in a given time and space, describing the movement, intensity, and indicators of rapid combustion of an ongoing fire. In other words, fire danger ratings describe conditions reflecting the potential, over a large area, for a fire to ignite, spread and require suppression action. How is fire danger different than fire behavior predictions?įire danger is a broad-scale assessment while fire behavior is site-specific. The key inputs into the NFDRS model are: fuels, weather, topography, and risks. What fire danger factors are used to get the Fire Danger Rating? In some cases, the National Forest may even restrict certain activities based on the fire danger levels. Contractors working in the forest may consider extra precautions when using equipment that might produce sparks. Homeowners may choose to postpone burning a debris pile if they are aware of the fire danger level for that day. Knowledge of these levels can guide forest visitors to make decisions regarding whether or not to have a campfire or ride their OHV in a grassy area. It links an organization's readiness level (or pre-planned fire suppression actions) to the potential fire problems of the day. The system combines the effects of existing and expected states of selected fire danger factors into one or more qualitative or numeric indices reflecting the area's fire protection needs. The National Fire Danger Rating System (NFDRS) is a system allowing fire managers to estimate today's or tomorrow's fire danger for a given area. What is the National Fire Danger Rating System?
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