Wind strengths - and swell scale


wind strength

Beaufort
description
kt
m/s
km/h
mph
Petersen description

0
calm
no air movement, smoke rises vertically
0-1
0,0 - <0,3
0 - 2
0 - <1,2
completely smooth surface of lake

1
quieter train
imperceptibly, smoke drift away easily, wind vane and wind vanes unmoved
1-4
0,3 - <1,6
2 - 5
1,2 - <4,6
calm, ruffled lake

2
light breeze
Leaves rustle, wind felt on face
5-7
1,6 - <3,4
6 - 11
4,6 - <8,1
slightly moving lake

3
gentle breeze
Beginnings of foaming
8-11
3,4 - <5,5
12 - 19
8,1 - <12,7
Leaves and small twigs in constant motion, pennants are stretched

4
moderate breeze
Branches move, loose paper lifted from the ground
12-16
5,5 - <8,0
20 - 28
12,7 - <18,4
slightly rough sea

5
fresh breeze
larger branches and trees move, wind clearly audible
17-22
8,0 - <10,8
29 - 38
18,4 - <25,3
moderately rough sea

6
strong wind
thick branches move, audible whistling on wires, to phone lines
23-28
10,8 - <13,9
39 - 49
25,3 - <32,2
rough sea

7
stiff wind
Trees sway, resistance to walk against the wind
29-34
13,9 - <17,2
50 - 61
32,2 - <39,1
very rough sea

8
stormy wind
large trees move, shutters are opened, breaking branches of trees, walking significant impediment
35-41
17,2 - <20,8
62 - 74
39,1 - <47,2
moderately high seas

9
storm
Branches break, minor damage to homes, bricks and smoke hoods are lifted roofs, garden furniture to be knocked down and blown away, walking significant impediment
42-48
20,8 - <24,5
75 - 88
47,2 - <55,2
high seas

10
severe storm
Trees are uprooted, trees break, garden furniture are blown away, major damage to homes and rarely inland
49-56
24,5 - <28,5
89 - 102
55,2 - <64,4
very high sea

11
hurricane-like storm
violent gusts, heavy storm damage, serious damage to forests (windfall), roofs are covered, cars will be thrown off the track, thick walls are damaged, walking is impossible, very rare inland
57-64
28,5 - <32,7
103 - 117
64,4 - <73,6
heavy seas

12
hurricane
severe storm damage and devastation, very rare inland
65-
= 32,7
= 117
= 73,6
exceptionally heavy seas



HOME Disclaimer Inprint Contakt Sitemap
© (1998 - 2018) www.ketch.de