What is indicated by a sustained increase in smoke volume and velocity?

A sustained increase in smoke volume and velocity is an important indicator of conditions within a fire scenario, particularly related to the potential for flashover. When the volume and velocity of smoke increase significantly, it suggests that a fire is growing more intense and that the atmosphere is becoming more conducive to rapid fire spread.

Flashover occurs when the combustible materials in an enclosed space reach their ignition temperature almost simultaneously, leading to a dramatic transition of the fire from a smoldering state to a fully developed fire. The increase in smoke volume indicates that more material is actively burning, and the increased velocity suggests that heat and gases are accumulating and moving rapidly within the environment. Together, these factors highlight a critical risk period where flashover could occur.

Understanding this aspect of fire dynamics is crucial for safety officers and firefighters, as recognizing these signs can lead to timely decisions that protect personnel and improve outcomes during firefighting operations.