What is one of the danger aspects of thunderstorms that can affect fire behavior?

Thunderstorms pose a significant risk to fire behavior, primarily due to the creation of dangerous downdrafts. These downdrafts, also known as downburst winds, happen when a mass of cool air descends rapidly from a thunderstorm and spreads out upon hitting the ground. This can result in strong, erratic winds that can dramatically influence the direction and intensity of a wildfire. Additionally, the winds can carry embers long distances, potentially igniting new spot fires ahead of the main fire front.

While thunderstorms can influence other factors such as humidity and precipitation, their most dangerous effect regarding fire behavior is the erratic winds resulting from downdrafts, which can exacerbate fire conditions and lead to unpredictable fire growth.