1 - STRENGTH AND EFFECTS OF WIND ON BEAUFORT SCALE
Degree Class* Load (N/mq) Knots Km/h m/s Envir. conditions Effects of wind
0 0 < 40 0-1 0-1 < 0,3 Calm Smoke rises vertically
1 0 < 40 1-3 1-5 0,3-1,5 Light air Direction of wind shown by smoke drift, but not by weather vanes
2 0 < 40 4-6 6-11 1,6-3,3 Light breeze Wind felt on face, ordinary vanes moved by wind
3 0 < 40 7-10 12-19 3,4-5,4 Gentle breeze Leaves and small twigs in constant motion
4 1 40 11-16 20-28 5,5-7,9 Moderate breeze Raises dust and loose paper; small branches are moved
5 2 70 17-21 29-38 8-10,7 Fresh breeze Small trees begin to sway
6 3 110 22-27 39-49 10,8-13,8 Strong breeze Large branches in motion; umbrellas used with difficulty
7 > 3 > 110 28-33 50-61 13,9-17,1 Strong wind Whole trees in motion; inconvenience felt when walking against wind
8 > 3 > 110 34-40 62-74 17,2-20,7 Fresh gale Branches break off trees; generally impedes progress
9 > 3 > 110 41-47 75-88 20,8-24,4 Strong gale Tiles come off roofs
10 > 3 > 110 48-55 89-102 24,5-28,4 Whole gale Trees uprooted
11 > 3 > 110 56-63 103-117 28,5-32,6 Storm Serious damage to buildings
12 > 3 > 110 >64 >118 > 32,7 Hurricane Immense damage
* According to the UNI EN 13561 standard
TABLES
2 - 04.2011
CORRADI S.P.A. - USER MANUAL - EXYL
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