Beaufort

Wind

Scale

Beaufort

number

Wind

speed

(km/hour)

Description

Effect

0

under

1

Calm

Smoke

rises

vertically

1

1-5

Light

air

Smoke

drifts

2

6-11

Light

breeze

Leaves

rustle

3

12-19

Gentle

breeze

Leaves

and

twigs

move

4

20-28

Moderate

breeze

Small

branches

move

5

29-38

Fresh

breeze

Small

trees

move

6

39-49

Strong

breeze

Large

branches

move

7

50-61

Near

gale

Whole

trees

move

8

62-74

Gale

Twigs

break

9

75-88

Strong

gale

Branches

break

10

89-102

Storm

Trees

uprooted

11

103-117

Violent

storm

Widespread

damage

12

118 +

Cyclone

Extreme

damage

The

Beaufort

Wind

Scale,

adapted

for

use

on

land