Wildfire Suppression Difficulty Index 97th Percentile (2026)

Wildfire Suppression Difficulty Index (SDI) 97th Percentile for 2026 Fire Season is a rating of relative difficulty in performing fire control work under regionally appropriate fuel moisture and 20 mph uphill winds (@ 20 ft).2026年火险季野火扑救难度指数（Wildfire Suppression Difficulty Index，SDI）第97百分位数据集，是对在区域适配的可燃物湿度条件，以及观测高度为20英尺的20英里每小时上坡风环境中开展火情控制作业的相对难度评级。