13
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 from trees.
Cars veer on road. Progress on foot is seriously
impeded
39 ~ 46 mph
34 ~ 40 knot
17.2 ~ 20.7 m/s
9
Strong gale
75 ~ 88 km/h
Some branches break off trees, and some small
trees blow over. Construction /temporary signs
and barricades blow over.
47 ~ 54 mph
41 ~ 47 knot
20.8 ~ 24.4 m/s
10
Storm
89 ~ 102 km/h
Trees are broken off or uprooted, structural
damage likely.
55 ~ 63 mph
48 ~ 55 knot
24.5 ~ 28.4 m/s
11
Violent storm
103 ~ 117 km/h
Widespread vegetation and structural damage
likely.
64 ~ 73 mph
56 ~ 63 knot
28.5 ~ 32.6 m/s
12
Hurricane force
≥ 118 km/h
Severe widespread damage to vegetation and
structures. Debris and unsecured objects are
hurled about.
≥ 74 mph
≥ 64 knot
≥ 32.7m/s
Summary of Contents for ESW5003
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