Beaufort scale, an approximate estimate of wind speed. OBZhD

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Beaufort scale, an approximate estimate of wind speed. Basics of safe life

Fundamentals of Safe Life Activities (OBZhD)

Beaufort points	Verbal definition of wind strength	Average wind speed, m/s	Average wind speed, km/h	Average wind speed, knots	wind action
Beaufort points	Verbal definition of wind strength	Average wind speed, m/s	Average wind speed, km/h	Average wind speed, knots	on the land	on the sea
0	Lull	0 - 0,2	0 - 0,9	0 - 0,9	Calm. The smoke rises vertically, the leaves of the trees are still	Mirror-smooth sea
1	Quiet	0,3 - 1,5	1 - 5	1 - 3	The direction of the wind is noticeable by the drift of the smoke, but not by the weather vane	Ripples, no foam on the crests of the waves. Wave height up to 0,1 m
2	Easy	1,6 - 3,3	6 - 11	3,5 - 6,4	The movement of the wind is felt by the face, the leaves rustle, the weather vane is set in motion	Short waves with a maximum height of up to 0,3 m, the crests do not tip over and appear glassy
3	Weak	3,4 - 5,4	12 - 19	6,6 - 10,1	Leaves and thin branches of trees sway all the time, the wind waving light flags	Short, well defined waves. Combs, overturning, form vitreous foam. Occasionally, small lambs are formed. Average wave height 0,6 m
4	Moderate	5,5 - 7,9	20 - 28	10,3 - 14,4	The wind raises dust and debris, sets in motion the thin branches of trees	The waves are elongated, the lambs are visible in many places. Maximum wave height up to 1,5 m
5	Fresh	8,0 - 10,7	29 - 38	14,6 - 19,0	Thin tree trunks sway, the movement of the wind is felt by hand	Well developed in length, but not large waves, the maximum wave height is 2,5 m, the average is 2 m. White lambs are visible everywhere (splashes form in some cases)
6	Strong	10,8 - 13,8	39 - 49	19,2 - 24,1	Thick tree branches sway, telegraph wires hum	Large waves begin to form. White foamy ridges occupy large areas, splashing is likely. Maximum wave height - up to 4 m, average - 3 m
7	Strong	13,9 - 17,1	50 - 61	24,3 - 29,5	Tree trunks sway	The waves pile up, the crests of the waves break, the foam falls in strips in the wind. Maximum wave height up to 5,5 m
8	Very strong	17,2 - 20,7	62 - 74	29,7 - 35,4	The wind breaks the branches of trees, it is very difficult to go against the wind	Moderately high long waves. On the edges of the ridges, spray begins to take off. Stripes of foam lie in rows in the direction of the wind. Maximum wave height up to 7,5 m, average - 5,5 m
9	Storm	20,8 - 24,4	75 - 88	35,6 - 41,8	Minor damage, the wind begins to destroy the roofs of buildings	High waves (maximum height - 10 m, average - 7 m). Foam in wide dense stripes lays down in the wind. The crests of the waves begin to capsize and crumble into spray that impair visibility.
10	Heavy storm	24,5 - 28,4	89 - 102	42,0 - 48,8	Significant destruction of buildings, the wind uproots trees	Very high waves (maximum height - 12,5 m, average - 9 m) with long crests curving down. The resulting foam is blown by the wind in large flakes in the form of thick white stripes. The surface of the sea is white with foam. The strong roar of the waves is like blows
11	Violent storm	28,5 - 32,6	103 - 117	49,0 - 56,3	Large destruction over a large area	Visibility is poor. Exceptionally high waves (maximum height - up to 16 m, average - 11,5 m). Small to medium sized boats are sometimes out of sight. The sea is all covered with long white flakes of foam, spreading downwind. The edges of the waves are everywhere blown into foam
12	Urahan	> 32,6	> 117	> 56	Very large discrepancies over a large area	Exceptionally poor visibility. The air is filled with foam and spray. The sea is all covered with strips of foam

Authors: Grinin A.S., Novikov V.N.

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