The Beaufort Wind Scale
Force
Description
Wind Speed
kmh
Wind Speed
knot
Wind Speed
mph
Land Signs
Sea State
0
Calm
0 – 1.4
0 – 0.8
0 – 0.9
Smoke rises vertically
Mirror Smooth
1
Light Air
1.5 – 5
0.9 – 2
1 – 3
Smoke Drifts
Scaly Ripple
2
Light Breeze
5 – 11
2 – 5
4 – 7
Leaves rustle, […]
