Beaufort Scale - Ambient Weather FALCON WS-8480 User Manual

5.1.17 Beaufort Scale

The Beaufort Scale is an international scale of wind velocities ranging from 0 (calm) to 12 (Hurricane
force).
The Beaufort Scale is defined as follows:
Beaufort Scale
0
1
2
3
4
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UV Exposure level
0 -
0.1 to 2.9 Low
3.0 to 5.9 Moderate
6.0 to 7.9 High
8.0 to 10.9 Very High
≥11.0 Extreme
Figure 27
Figure 28
Description
Calm
Light air
Light breeze
Gentle breeze
Moderate breeze
Color
-
Green
Yellow
Orange
Red
Purple
Wind Speed
< 1 km/h Calm. Smoke rises
vertically.
< 1 mph
< 1 knot
< 0.3 m/s
1.1 - 5.5 km/h Smoke drift indicates
wind direction.
1 - 3 mph
Leaves and wind vanes
1 - 3 knot
are stationary.
0.3 - 1.5 m/s
5.6 - 11 km/h Wind felt on exposed
skin. Leaves rustle.
4 - 7 mph
Wind vanes begin to
4 - 6 knot
move.
1.6 - 3.3 m/s
12 - 19 km/h Leaves and small twigs
constantly moving,
8 - 12 mph
light flags extended.
7 - 10 knot
3.4 - 5.4 m/s
20 - 28 km/h Dust and loose paper
Land Condition
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