Wildfire Suppression Difficulty Index 90th Percentile (2026)

Wildfire Suppression Difficulty Index (SDI) 90th Percentile for 2026 Fire Season is a rating of relative difficulty in performing fire control work under regionally appropriate fuel moisture and 15 mph uphill winds (@ 20 ft).2026年火灾季野火扑救难度指数（SDI）90百分位数，是在区域适配的可燃物湿度条件下，以及20英尺高度处15英里每小时的上坡风环境中，开展野火扑救作业的相对难度评级。