What did the first arriving engine observe from the scene?

The first arriving engine observed significant smoke columns rising vertically above the structure because this visual cue is often indicative of a fire's behavior and intensity in its early stages. Vertical smoke columns suggest that the fire is likely confined and that the heat is rising directly into the atmosphere, which can provide crucial information regarding the fire's location and potential growth. Observing such smoke patterns allows firefighters to assess the situation effectively and make informed tactical decisions, such as where to focus their efforts and which areas may be most at risk. This information is vital for ensuring the safety of both the responders and any civilians in proximity to the fire.

In contrast, dense smoke billowing from the interior would suggest a more advanced stage of fire spread, while a raging fire engulfing an entire structure would indicate a critical situation requiring immediate intervention. Observing a partial collapse of the roof would raise significant concerns about structural integrity but wouldn’t provide a clear assessment of the fire's current behavior or potential for escalation. Thus, the observation of vertical smoke columns is critical for initial strategic planning by the fire crews arriving on scene.