Version 1.0
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Page 20
5.8.1
Average Wind Speed, Wind Gust and Beaufort Scale
To change the display between average wind speed, wind gust and Beaufort scale, press the
WIND
button on the front of the display.
The wind speed is the average calculated by the sensor array in the 12 second update period. The wind
gust is the maximum calculated by the sensor array in the 12 second update period, and then passed to
the console. Thus, you never miss a wind gust.
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
Description
Wind Speed
Land Condition
0
Calm
< 1 km/h
Calm. Smoke rises
vertically.
< 1 mph
< 1 knot
< 0.3 m/s
1
Light air
1.1 - 5.5 km/h
Smoke drift indicates
wind direction.
Leaves and wind vanes
are stationary.
1 - 3 mph
1 - 3 knot
0.3 - 1.5 m/s
2
Light breeze
5.6 - 11 km/h
Wind felt on exposed
skin. Leaves rustle.
Wind vanes begin to
move.
4 - 7 mph
4 - 6 knot
1.6 - 3.3 m/s
3
Gentle breeze
12 - 19 km/h
Leaves and small twigs
constantly moving,
light flags extended.
8 - 12 mph
7 - 10 knot
3.4 - 5.4 m/s
4
Moderate breeze
20 - 28 km/h
Dust and loose paper
raised. Small branches
begin to move.
13 - 17 mph
11 - 16 knot
5.5 - 7.9 m/s
5
Fresh breeze
29 - 38 km/h
Branches of a moderate
size move.
Small trees in leaf
begin to sway.
18 - 24 mph
17 - 21 knot
8.0 - 10.7 m/s
6
Strong breeze
39 - 49 km/h
Large branches in
motion. Whistling
heard in overhead
wires. Umbrella use
becomes difficult.
Empty plastic bins tip
over.
25 - 30 mph
22 - 27 knot
10.8 - 13.8 m/s
7
High wind
50 - 61 km/h
Whole trees in motion.
Effort needed to walk
against the wind.
31 - 38 mph
28 - 33 knot
13.9 - 17.1 m/s
8
Gale
62 - 74 km/h
Some twigs broken