Scale
Wind Name
Speed kph
Decription
0
Calm
0
smoke rises
vertically
1
Light air
1-5
direction shown by smoke but
not by wind vanes
2
Light breeze
6-11
wind felt on face, leaves
rustle, wind vane moved by wind
3
Gentle breeze
12-19
leaves and small twigs in
constant motion; light flags extended
4
Moderate breeze
20-28
raises dust and loose paper,
small branches are moved
5
Fresh breeze
29-38
small trees in leaf begin to
sway; crests on inland water
6
Strong breeze
38-49
large branches in motion;
umbrellas used with difficulty, whistling in telegraph
wires
7
Moderate gale
50-61
whole trees in motion;
inconvenience felt when walking against wind
8
Fresh gale
62-74
twigs break off trees;
generally impedes progress
9
Strong gale
75-88
slight structural damage,
chimney-pots and slates removed
10
Whole gale
89-102
trees uprooted, considerable
structural damage
11
Storm
103-117
widespread damage, very
rarely experienced
12
Hurricane
118 plus
devastation