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Which weather factor has the potential to accelerate the drying of fuels?

  1. High relative humidity

  2. Low temperatures

  3. Strong winds

  4. Frequent rainfall

The correct answer is: Strong winds

Strong winds significantly contribute to the acceleration of the drying of fuels in wildland firefighting. When winds are strong, they increase the rate of evaporation of moisture from vegetation and other fuels. This happens because the moving air carries away the water vapor that collects near the fuel, exposing the surfaces to fresh air that can facilitate further evaporation. In addition to drying the fuels out more quickly, strong winds can also help carry sparks and embers, potentially spreading fires over larger areas. In contrast, high relative humidity can slow down the drying process by maintaining moisture in the air, thereby keeping fuels wet. Low temperatures can also inhibit the drying of fuels, as cooler air holds less moisture, and moisture from the ground may not evaporate as swiftly. Frequent rainfall replenishes moisture in the environment and can lead to saturated fuels, making them less susceptible to ignition and able to resist burning effectively.