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The following table shows the Beafort scale and its wind speed ranges.
BEAUFORT SCALE
Symbol
Beaufort
force
Effect
Calm
0 - 0.2 0 - 1 0 Smoke rises vertically
Light air
0.3 - 1.5 1 - 5 1 Smoke drifts slightly
Light breeze
1.6 - 3.3 6 - 11 2
Leaves rustle
Wind vane moves
Gentle breeze
3.4 - 5.4 12 - 19 3
Leaves-constant motion
Light flag extended
Moderate breeze
5.5 - 7.9 20 - 28 4
Raises dust and papers
Small branches stir
Fresh breeze
8.0 - 10.7 29 - 38 5 Small trees sway
Strong breeze
10.8 - 13.8 39 - 49 6
Large branches move
Use of umbrella difficult
Moderate gale
13.9 - 17.1 50 - 61 7 Whole trees in motion
Fresh gale
17.2 - 20.7 62 - 74 8
Twigs broken off trees
Difficult to drive a car
Strong gale
20.8 - 24.4 75 - 88 9 Slight structure damage occurs
Whole gale
24.5 - 28.4 89 - 102 10
Trees uprooted
Severe structural damage
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