The Beaufort Scale
The Beaufort scale is basically a wind speed scale and will come in handy when checking out the weather reports.
Beaufort Number
Description
Wind Speed (mph)

Observations

0
Calm
0

Tree leaves don't move, smoke rises vertically, sea is calm, mirror like.

1
Light Air
1-3

Tree leaves don't move, smoke drifts slowly, direction of wind shown by smoke, not by vane, sea a light ripple.

2
Slight Breeze
4-7

Tree leaves rustle, flagswave slightly, vanes show wind direction, small wavelets or scale waves.

3
Gentle Breeze
8-11

Leaves and twigs in constant motion, small flags extended, long unbreaking waves.

4
Moderate Breeze
13-18

Small branches move, flags flap, waves with whitecaps.

5
Fresh Breeze
19-24

Small trees sway, flags and ripple, moderate waves with many whitecaps.

6
Strong Breeze
25-31

Large branches sway, umbrellas used with difficulty, flags beat and pop, larger waves with regular whitecaps.

7
Moderate Gale
32-38

Sea heaps up, white foam streaks, whole trees sway, difficult to walk, large waves.

8
Fresh Gale
39-46

Twigs break off trees, moderately high sea with blowing foam.

9
Strong Gale
47-54

Branches break off trees, tiles blown from roofs, high crested waves.

10
Whole Gale
55-63

Some trees blown down, damage to buildings, high churning white seas and exceptionally high waves hiding ships from view.

11
Storm
64-74

Widespread damage to trees and buildings, mountainous waves, sea covered in white foam.

12
Hurricane
75+

Severe and extensive damage.

       
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