Wind Force

Beaufort
scale of the wind
effects
m/s
Km/h
0
calm none 0 - 0,5 0 - 1
1
very slight draft smoke does not rise up straight 0,5 - 1,5 1 - 5
2
very light breeze just perceptable 1,5 - 3 6 - 11
3
light breeze leaves move 3 - 5 12 - 19
4
moderate breeze small twigs move 5 - 8 20 - 28
5
fresh breeze larger twigs move 8 - 10,5 29 - 38
6
strong wind larger branches move 10,5 - 14 39 - 49
7
stiff wind weaker tree trunks move 14 - 17 50 - 61
8
stormy wind stronger tree trunks move 17 - 20,5 62 - 74
9
storm roof tiles are taken off 20,5 - 24,5 75 - 88
10
strong storm trees are uprooted 24,5 - 28,5 89 - 102
This is an excerpt from "The New Boomerang Booklet", which the author kindly put to our disposal. For further and very detailed information on the topic of boomerangs and also on this subject, see "The new Boomerang Booklet" by Michael Siems.