Obtaining a better understanding of how the fire-perturbed atmosphere may ignite more fuel is important to firefighters, but it is also a topic of interest for the general public. If large enough, fires can grow by feeding themselves. Atmospheric measurements during a fire can help scientists and firefighters better understand how the fire will evolve and whether there is a risk that the fire will run out of control. The authors show that using sonde measurements during the fire enables firefighters to better predict how it will evolve, thereby improving their security. At the same time, such measurements provide a valuable dataset for scientific model testing and development.