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Beaufort Number
or Force
mph
0
<1
1-3
1
mph
4-7
2
mph
8-12
3
mph
13-18
4
mph
19-24
5
mph
25-31
6
mph
32-38
7
mph
39-46
8
mph
Wind Speed
km/hr
knots
<1
<1
1-5
1-3
kph
knots
6-11
4-6
kph
knots
12-19
7-10
kph
knots
20-28
11-16
kph
knots
29-38
17-21
kph
knots
39-49
22-27
kph
knots
50-61
28-33
kph
knots
62-74
34-40
kph
knots
13
Description
Effects Land / Sea
Still, calm air, smoke
will rise vertically.
Calm
Water is mirror-like.
Rising smoke drifts,
wind vane is inactive.
Light Air
Small ripples appear
on water surface.
Leaves rustle, can feel
wind on your face,
wind vanes begin to
move.
Light Breeze
Small wavelets
develop, crests are
glassy.
Leaves and small
twigs move, light
weight flags extend.
Gentle Breeze
Large wavelets, crests
start to break, some
whitecaps.
Small branches move,
raises dust, leaves
and paper.
Moderate Breeze
Small waves develop,
becoming longer,
whitecaps.
Small trees sway.
White crested
Fresh Breeze
wavelets (whitecaps)
form, some spray.
Large tree branches
move, telephone wires
begin to "whistle",
umbrellas are difficult
to keep under control.
Strong Breeze
Larger waves form,
whitecaps prevalent,
spray.
Large trees sway,
becoming difficult to
walk.
Moderate or Near Gale
Larger waves develop,
white foam from
breaking waves
begins to be blown.
Twigs and small
branches are broken
from trees, walking is
difficult.
Gale or Fresh Gale
Moderately large
waves with blown
foam.
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