LEXIBOOK MeteoClock SM1960 Manuel D'instructions page 19

SM1960IM size : 110mm W x 105mm H
Beaufort Force Wind Speed Wind Speed
(KmPH) (MPH)
0 0-2 0-1
1 2-5 1-3
2 6-12 4-7
3 13-20 8-12
4 21-29 13-18
5 30-39 19-24
6 40-50 25-31
7 51-61 32-38
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Terms Indicators
used in
forecasts
Calm Calm; smoke rises vertically.
The sea is mirror-like.
Light Smoke drift indicates wind
direction.
Light Wind felt on face, leaves rustle.
Gentle Leaves and small twigs in
constant motion.
Moderate Raises dust, leaves and loose
paper; small branches move.
At sea, small waves 1-4ft
(up to 1.2m) take form.
Fresh Small trees in leaf begin to
sway; crested wavelets form
on inland waters. At sea, 4-8ft
(1 to 2.5m) waves.
Strong Large branches in motion;
whistling heard in wires;
umbrellas used with difficulty.
At sea, 8-13ft (2.5-4m) waves.
Strong Whole trees in motion;
inconvenience felt while
walking against the wind.
At sea, 13-20ft (4-6m) waves.
35
8 62-74 39-46
9 75-87 47-54
10 88-101 55-63
11 102-116 64-72
12 117 or more 73 or more
36
Gale Breaks twigs off trees;
generally impedes progress.
Gale Slight structural damage,
roofing dislodged, larger
branched break off. High waves
(20ft/6m), reduced visibility at
sea.
Storm Seldom experienced inland;
trees uprooted; considerable
structural damage occurs.
At sea, 20-30ft (6-9m) waves.
Storm Very rarely experienced inland;
accompanied by widespread
damage. Exceptionally high
waves 30-45ft (9-14m).
Hurricane Very rarely experienced;
accompanied by widespread
damage. At sea, waves over
45ft/14m, visibility greatly
reduced.