What does the term “flare-up” refer to in wildfire terminology?

The term “flare-up” in wildfire terminology specifically refers to a sudden increase in fire intensity or spread. This phenomenon occurs when conditions change rapidly, causing the fire to behave more aggressively than previously observed. Factors contributing to flare-ups can include shifts in wind direction, changes in humidity, the introduction of new fuel sources, or the presence of embers that ignite additional combustible materials. Understanding this concept is crucial for firefighting efforts as it emphasizes the unpredictable nature of wildfires and the need for constant situational awareness. Other options describe different aspects of fire behavior or management, but they do not capture the essence of a "flare-up," which specifically highlights the potential for rapid escalation of a wildfire situation.