1
2
3
4
Moderate breeze
5
6
7
8
9
54
Light air
Light breeze
Gentle breeze
Fresh breeze
Strong breeze
High wind
Gale
Strong gale
1.1 - 5.5 km/h
1 - 3 mph
Smoke drift indicates wind direction. Leaves
1 - 3 knot
0.3 - 1.5 m/s
5.6 - 11 km/h
4 - 7 mph
Wind felt on exposed skin. Leaves rustle.
4 - 6 knot
1.6 - 3.3 m/s
12 - 19 km/h
8 - 12 mph
Leaves and small twigs constantly moving,
7 - 10 knot
3.4 - 5.4 m/s
20 - 28 km/h
13 - 17 mph
11 - 16 knot
5.5 - 7.9 m/s
29 - 38 km/h
18 - 24 mph
Branches of a moderate size move. Small
17 - 21 knot
8.0 - 10.7 m/s
39 - 49 km/h
Large branches in motion. Whistling heard
25 - 30 mph
in overhead wires. Umbrella use becomes
22 - 27 knot
10.8 - 13.8 m/s
50 - 61 km/h
31 - 38 mph
Whole trees in motion. Effort needed to walk
28 - 33 knot
13.9 - 17.1 m/s
62 - 74 km/h
39 - 46 mph
Some twigs broken from trees. Cars veer on
road. Progress on foot is seriously impeded.
34 - 40 knot
17.2 - 20.7 m/s
75 - 88 km/h
Some branches break off trees, and some
47 - 54 mph
small trees blow over. Construction /tempo-
41 - 47 knot
20.8 - 24.4 m/s
and wind vanes are stationary.
Wind vanes begin to move.
light flags extended.
Dust and loose paper raised. Small
branches begin to move.
trees in leaf begin to sway.
difficult. Empty plastic bins tip over.
against the wind.
rary signs and barricades blow over.