风力等级 | 距地面10 m高处风速(m/s) | 范围中数 | 森林火险天气指数E |
0 | 0.0~0.2 | 0 | 0 |
1 | 0.3~1.5 | 1 | 5 |
2 | 1.6~3.3 | 2 | 10 |
3 | 3.4~5.4 | 4 | 15 |
4 | 5.5~7.9 | 7 | 20 |
5 | 8.0~10.7 | 9 | 25 |
6 | 10.8~13.8 | 12 | 30 |
7 | 13.9~17.1 | 16 | 35 |
8 | 17.2~20.7 | 19 | 40 |