What is a significant indicator of potential hotspots during overhaul besides visual signs?

The feeling of heat is a significant indicator of potential hotspots during overhaul because it suggests the presence of remaining hot spots or smoldering materials that could reignite. Even if there are no visible flames or smoke, the sensation of heat can serve as a critical warning sign that there might still be hidden or lingering fire within the structure or materials. Firefighters can use this sensory input to guide their search for hotspots, ensuring that they thoroughly check areas that feel unusually warm, which may indicate trapped heat sources that haven't fully combusted.

Other options, while they may imply different conditions, do not directly serve as indicators of hotspots. A strong wind may affect fire behavior or spread but doesn't specifically indicate the presence of heat or potential hotspots. The absence of smoke suggests that a fire may be out, and cold temperatures further imply that there may not be any active fire. Therefore, the feeling of heat remains the most reliable indicator for assessing the possibility of remaining fire hazards during overhaul operations.