What behavior indicates a potential change in fire intensity?

The behavior that indicates a potential change in fire intensity is an increase in smoke production and color changes in smoke. When a fire is growing in intensity, it typically produces more smoke, and the characteristics of the smoke can provide critical information about the fire's conditions.

For instance, a darkening color in smoke often signifies that the fire is consuming more materials that contribute to higher heat generation and potential accelerants, indicating that the fire may be intensifying. Additionally, volume and visibility of smoke can indicate fluctuations in oxygen levels, which might also affect the fire's behavior. Understanding these signs is crucial for firefighting operations, as they can help firefighters anticipate changes in the fire's behavior, which is critical for safety and effective suppression strategies.