0
0-2
0-1
Calm
Calm; smoke rises vertically.
The sea is mirror like.
1
2-5
1-3
Light
Smoke drift indicates wind
direction.
2
6-12
4-7
Light
Wind felt on face, leaves rustle
3
13-20
8-12
Gentle
Leaves and small twigs in
constant motion
4
21-29
13-18
Moderate
Raises dust, leaves and loose
paper; small branches move.
At sea, small waves 1-4ft (up to
(1.2m) take form.
5
30-39
19-24
Fresh
Small trees in leaf begin to
sway; crested wavelets form
on inland waters. At sea, 4-8ft
(1to 2.5m) waves
6
40-50
25-31
Strong
Large branches in motion;
Whistling heard in wires;
umbrellas used with difficulty.
At sea, 8-13ft (2.5-4m) waves
WIND SPEED DISPLAY
23
Beaufort Force Wind Speed
(KmPH)
Wind Speed
(MPH)
Terms used
in forecasts
Indicators