67
Beaufort
Description
Wind speed
Effect on land
6
Strong wind
39 - 49 km/h
Thicker branches move, audible whistling
at wire cables and lines
25 - 30 mph
22 - 27 knots
10.8 - 13.8 m/s
7
Brisk wind
50 - 61 km/h
Trees sway, resistance can be felt when
walking against the wind
31 - 38 mph
28 - 33 knots
13.9 - 17.1 m/s
8
Stormy wind
62 - 74 km/h
Large trees move, window shutters are
opened, twigs on trees break, considerable
impairment when walking
39 - 46 mph
34 - 40 knots
17.2 - 20.7 m/s
9
Storm
75 - 88 km/h
Branches of trees break, smaller damage
on buildings, tiles are lifted from roofs, gar-
den furniture is thrown over and moved,
considerable impairment when walking
47 - 54 mph
41 - 47 knots
20.8 - 24.4 m/s
10
Severe storm
89 - 102 km/h
Trees may be uprooted, tree trunks break,
garden furniture is blown away, larger dam-
age to buildings; rarely occurs inland
55 - 63 mph
48 - 55 knots
24.5 - 28.4 m/s
11
Hurricane-like
storm
103 - 117 km/h
Severe gusts, severe storm damage, severe
damage to forests/wind breakage, roofs are
uncovered, cars are blown from the track,
walking is impossible, very rarely occurs
inland
64 - 73 mph
56 - 63 knots
28.5 - 32.6 m/s
12
Hurricane
≥
118 km/h
Most severe storm damage and devasta-
tion; very rarely occurs inland
≥
74 mph
≥
64 knots
≥
32.7m/s
