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Light wildland fuels are more likely to produce spot fires due to their ability to ignite quickly and spread rapidly. These fuels, which include grasses, small shrubs, and other fine materials, can easily catch fire from embers and carry the flames to new areas, resulting in spot fires.

Additionally, while heavier wildland fuels may burn longer and produce more heat, they do not ignite as easily or spread as quickly as lighter fuels. Urban materials can contribute to fire spread through the presence of various combustibles but are not typically associated with the rapid onset of spot fires as light wildland fuels are. Low humidity conditions can increase fire intensity and spread, but they do not directly cause the ignition of new fires like light fuels do.

Understanding the ignition and spread characteristics of various fuels is crucial for fire management and prevention strategies, particularly in wildland-urban interface areas where the potential for spot fires can pose significant threats.