Beaufort Scale

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The Beaufort Scale is also useful when judging the strength of the wind if you have nothing else.

A few blades of grass thrown in to the air can help with wind direction

 

Beaufort Wind Scale

Beaufort
Number

Description

mi/hr		 Wind Speed
knots

km/hr

Observations
0 Calm 0-1 0-1 0-2 Smoke rises vertically
1 Light air 1-3 1-3 2-6 Direction of wind shown by drifting smoke, but not by wind values
2 Slight breeze 4-7 4-6 7-11 Wind felt on face; leaves rustle; wind vanes moved by wind; flags stir
3 Gentle breeze 8-12 7-10 12-19 Leaves and small twigs move; wind will extend light flag
4 Moderate breeze 13-18 11-16 20-29 Wind raises dust and loose paper; small branches move; flags flap
5 Fresh breeze 19-24 17-21 30-39 Small trees with leaves begin to sway; flags ripple
6 Strong breeze 25-31 22-27 40-50 Large tree branches in motion; whistling heard in power lines; umbrellas used with difficulty
7 High wind 32-38 28-33 51-61 Whole trees in motion; inconvenience felt walking against wind; flags extend
8 Gale 39-46 34-40 62-74 Wind breaks twigs off trees; walking is difficult
9 Strong gale 47-54 41-47 75-87 Slight structural damage occurs (signs and antennas blown down)
10 Whole gale 55-63 48-55 88-101 Trees uprooted; considerable damage occurs
11 Storm 64-74 56-64 102-119 Winds produce widespread damage
12 Hurricane >=75 >=65 >=120 Winds produce extensive damage