Which type of fire column behavior indicates an increasing intensity of fire activity?

The type of fire column behavior that indicates an increasing intensity of fire activity is associated with a changing column. A changing column reflects dynamic conditions where the fire's intensity is fluctuating, often increasing due to factors such as rising temperatures, changing winds, or varying fuel availability.

This kind of behavior is typically characterized by the development of a strong updraft, which can lead to more vigorous fire activity. As the fire grows and generates more heat, the column can change rapidly, indicating that the fire is becoming more intense or erratic. Observing a changing column is crucial for fire behavior analysts and firefighting crews, as it provides real-time information about how the fire might spread or behave in the immediate future, allowing for better decision-making and resource allocation.

In contrast, well-developed columns indicate a more stable and sustained intensity of fire behavior, while leaning or sheared columns suggest wind effects that might not necessarily correlate with increasing intensity.