What role does relative humidity play in wildfire behavior?

Relative humidity plays a crucial role in wildfire behavior by influencing the moisture content of fuels and their flammability. When relative humidity is low, the atmosphere is dry, which can lead to decreased moisture in vegetation and other fuel sources, making them more susceptible to ignition. This reduction in moisture can cause fuels to ignite more easily, burn more quickly, and lead to more intense fire behavior.

On the other hand, higher relative humidity typically results in increased moisture levels in fuels, which can inhibit ignition and slow combustion rates. Therefore, understanding relative humidity is essential for predicting fire behavior, fire spread, and the overall dynamics of wildfires.

While some options may suggest that humidity prevents fires from igniting or has no effect at all, the reality is that it fundamentally dictates the conditions under which fuels can ignite and how they will burn once ignited. This understanding is vital for effective wildfire management and mitigation strategies.