EXPERIMENT MANUAL
Franckh-Kosmos Verlags-GmbH & Co. KG, Pfizerstr. 5-7, 70184 Stuttgart, Germany | +49 (0) 711 2191-0 | www.kosmos.de
Thames & Kosmos, 301 Friendship St., Providence, RI, 02903, USA | 1-800-587-2872 | www.thamesandkosmos.com
Thames & Kosmos UK Ltd, Goudhurst, Kent, TN17 2QZ , United Kingdom | 01580 212000 | www.thamesandkosmos.co.uk
Beaufort
number
Wind speed
km/h m/s
Description Effects on land
0 < 1 < 0.3 Calm No air movement: smoke rises vertically.
1 1 – 5 0.3 – 1.6 Gentle air Smoke drifts slightly, but wind vanes don’t move.
2 6 – 11 1.6 – 3.4 Light breeze
Rising smoke clearly shows the wind direction. Leaves rustle
and you can feel the wind on your face.
3 12 – 19 3.4 – 5.5 Gentle breeze Tree tops, leaves, and thin branches move softly.
4 20 – 28 5.5 – 8.0 Moderate breeze Branches move. Loose paper is swept up off the ground.
5 29 – 38 8.0 – 10.8 Fresh breeze
Larger branches and small trees start to sway in the wind.
The wind is distinctly audible.
6 39 – 49 10.8
–
13.9 Strong wind Thick branches move. Umbrellas are hard to use.
7 5
0 – 61 13.9 – 17.2 Stiff wind
Trees sway and you can feel resistance when walking into
the wind.
8 62 – 74 17.2 – 20.8 Stormy wind
Even large trees are moved around and leaves and branches
are torn from trees.
9 75 – 88 20.8 – 24.5 Storm Branches break. Bricks and chimneys are damaged
.
1
0 89
–
102 24.5 – 28.5 Heavy storm
Trees break or are even uprooted. Garden furniture is blown
away and severe damage is caused to houses.
11 103 – 117 28.5 – 32.7
Hurricane-like
storm
Severe damage to forests, roofs torn off, cars thrown out of
their lanes, thick walls damaged.
12 >
117 >
32.7 Hurricane
Most severe storm damage and devastation, especially near
the ocean.
The Beaufort Scale
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