What is one of the warning signs of a rollover?

One of the warning signs of a rollover is the presence of flames licking overhead. This phenomenon is often indicative of a fast-developing fire that has reached a critical stage, where conditions allow for the fire to transition from a relatively stable state to a more explosive situation.

When flames are observed licking overhead, it suggests that the fire is consuming available fuels in the upper layers of the environment, leading to a potential for increased heat and gas accumulation. As this occurs, the conditions become ripe for a rollover, where hot gases may ignite suddenly and create a dangerous situation for those nearby. Recognizing this sign can help firefighters and responders to assess the danger of rollover within a burning structure or environment, allowing them to take necessary precautions to protect themselves and mitigate the risks associated with fire behaviors.

In contrast, the other choices do not directly indicate the imminent danger of a rollover. A sudden power outage, while critical in some contexts, does not provide a clear signal about fire behavior. High levels of humidity may affect fire spread but are not a direct warning sign of a rollover. Lastly, sustained cold temperatures generally do not correlate with rollover situations, as they may inhibit fire behavior, rather than enhance it.