Air flow scale  

Explanation

風力等級

（KT）

(m/s)

說明

1

0.5-1

0-0.3

Flat calm-smoke curls straight upwards

穩靜、煙火裊裊直升

2

1-4

0.3-1.6

Smoke will weave in a direction

煙會編向

3

4-7

1.6-3.4

Leaves will move

樹葉會動

4

7-11

3.4-5.5

Branches will move and flags unfurl

樹枝會動、旗幟會展開

5

14-17

5.5-8.0

Sand and dust flies upwards , paper flies

沙塵飛揚、紙會飛、小樹枝會搖

6

17-22

8.0-10

Tree trunks sway and the surface of water ripples

樹桿搖動、水面起波紋