New surface fire spread models in the enhanced Canadian Forest Fire Danger Rating System (CFFDRS) will be driven explicitly by relationships that relate open 10 m wind speed and direction to in stand wind and direction. These winds are responsible for the movement of a surface fire. In addition, new fuel moisture models will use these in-stand winds, precipitation through fall and solar radiation reaching the forest floor for specific stand types and densities based on leaf area index (LAI) and other variables.
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