![]() ![]() Flames are visible and gaining ground.ģ) Fully Developed (Transition): As more fuel becomes consumed, the fire moves into a fully developed state. This is when the structure becomes the next available fuel source, the fire begins to spread beyond the initial ignition point. With the help of oxygen, the ember increases in heat and strength.Ģ) Flashover (Flaming): The combination of heat, oxygen, and fuel increase the odds of the fire growing to the next stage. ![]() Here are the four stages of fire combustion:ġ) Incipient (Pre-Heat, Pre-Ignition): As an ember lands within a load of flammable material, a fuel source, such as pine needles and leaves left in rain gutters, it is setting the stage for ignition to occur. Firebrands or burning embers, which can smolder for weeks, are the most dangerous element in a wildfire.
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