Logo with a link to the homepage.

Ongoing Research



Adjective Class Rating PDF
Fire Danger Rating and
 Color Code
Description
Low (L)
(Dark Green)
Fuels do not ignite readily from small firebrands although a more intense heat source, such as lightning, may start fires in duff or punky wood. Fires in open cured grasslands may bum 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.
Moderate (M)
(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 low. Fires in open cured grasslands 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 (H)
(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. Fires may become serious and their control difficult unless they are attacked successfully while small.
Very High (VH)
(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 (E)
(Red)
Fires start quickly, spread furiously, and burn intensely. All fires are potentially serious. Development into high intensity burning will usually be faster and occur from smaller fires than in the very high fire 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.
 

濂ヤ匠鍗庢寜鎽╂ 瀹剁敤鎸夋懇妞 鎳掗澶 鏂彲棣ㄥ竷鑹烘矙鍙 娆у紡甯冭壓娌欏彂 甯冭壓娌欏彂灏忔埛鍨 瀹炴湪娌欏彂 瀹炴湪鐪熺毊娌欏彂 瀹炴湪缁勫悎娌欏彂 鍑姘存満 杞按鏈 瀹変箣鏄熷噣姘村櫒 鑱斿悎鍒╁崕鍑姘村櫒 瀹剁敤璺戞鏈 瀹剁敤璺戞鏈