Measurement conditions to DIN EN 13829 /ISO 9972
24
2. Wind speed less than 6 m/s (Beaufort 3)
NOTE!
To determine the wind speed refer to Table 1.
Table 1: Beaufort wind scale, reproduced from FLiB: Supplement to DIN EN 13829, April 2008
Beau
fort
Name
Wind speed
(m/s)
Description
0
windless
< 0,45
No wind, smoke rises vertically
1
Quiet
0,45 – 1,34
Wind direction can only be determined
by smoke (not by wind vane)
2
Light breeze
1,8 – 3,1
Wind can be felt in the face, leaves mover,
wind vane moves
3
Weak breeze
3,6 – 5,4
Leaves and thin branches move;
wind stretches a pennant
4
Moderate
breeze
5,8 – 8
Wind is lifting dust and loose paper;
wind is moving twigs and thin branches
5
Fresh breeze
8,5 – 10,7
Small trees begin to sway;
there are foam heads on lakes
6
Strong wind
11,2 – 13,9
Strong branches in motion;
umbrellas difficult to use
7
Stiff wind
14,3 – 17
Whole trees in motion; noticeable
inhibition when walking against the wind
8
Stormy wind
17,4 – 20,6
Breaks branches from trees;
makes walking considerably more difficult
