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Sheffield Weather Page

Weather Glossary

Beaufort Wind Scale
The Beaufort wind scale was defined in 1805 by Admiral Frances Beaufort to describe the wind effects on a fully rigged Man of War Frigate. Over the years the scale has been adapted to show the effects on land as well which is shown below. Originally to allow for estimation of wind speed without an instrument it’s now used as a basic scale to indicate the wind
Beaufort Wind Scale
Beaufort Force Number
Mean Wind speed (Mph)
Limits (MPH)
Description
Effects
0
0
0
Calm
Smoke Rises Vertically
1
2
1 - 3
Light Air
Smoke Drift indicating direction
2
5
4 - 7
Light Breeze
Wind Felt on Face, Leaves Rustle
3
10
8 - 12
Gentle Breeze
Leaves, Small twigs in constant motion
4
15
13 - 18
Moderate Breeze
Dust and Leaves Raised up, Branches move
5
21
19 - 24
Fresh Breeze
Small Trees begin to sway
6
28
24 - 31
Strong Breeze
Large Branches of Trees in Motion
7
35
32 - 38
Moderate Gale
Whole Trees in motion, resistance felt to walking against the wind
8
42
39 - 46
Fresh Gale
Twigs and small branches break from Tree
9
50
47 - 54
Strong Gale
Large branches break from tree
10
59
55 - 63
Whole Gale
Trees broken and uprooted
11
68
64 - 72
Storm
Widespread damage
12
78
73 - 82
Hurricane
Violence and Destruction
13
88
83 - 92
© Lorem ipsum dolor sit Nulla in mollit pariatur in, est ut dolor eu eiusmod lorem 2014
Sheffield Weather Page

Weather Glossary

Beaufort Wind Scale
The Beaufort wind scale was defined in 1805 by Admiral Frances Beaufort to describe the wind effects on a fully rigged Man of War Frigate. Over the years the scale has been adapted to show the effects on land as well which is shown below. Originally to allow for estimation of wind speed without an instrument it’s now used as a basic scale to indicate the wind
Beaufort Wind Scale
Beaufort Force Num- ber
Mean Wind speed (Mph)
Limits (MPH)
Description
Effects
0
0
0
Calm
Smoke Rises Vertically
1
2
1 - 3
Light Air
Smoke Drift indicating direction
2
5
4 - 7
Light Breeze
Wind Felt on Face, Leaves Rustle
3
10
8 - 12
Gentle Breeze
Leaves, Small twigs in constant motion
4
15
13 - 18
Moderate Breeze
Dust and Leaves Raised up, Branches move
5
21
19 - 24
Fresh Breeze
Small Trees begin to sway
6
28
24 - 31
Strong Breeze
Large Branches of Trees in Motion
7
35
32 - 38
Moderate Gale
Whole Trees in motion, resistance felt to walking against the wind
8
42
39 - 46
Fresh Gale
Twigs and small branches break from Tree
9
50
47 - 54
Strong Gale
Large branches break from tree
10
59
55 - 63
Whole Gale
Trees broken and uprooted
11
68
64 - 72
Storm
Widespread damage
12
78
73 - 82
Hurricane
Violence and Destruction
13
88
83 - 92
© Lorem ipsum dolor sit Nulla in mollit pariatur in, est ut dolor eu eiusmod lorem 2014
Sheffield Weather Page

Weather Glossary

Beaufort Wind Scale
The Beaufort wind scale was defined in 1805 by Admiral Frances Beaufort to describe the wind effects on a fully rigged Man of War Frigate. Over the years the scale has been adapted to show the effects on land as well which is shown below. Originally to allow for estimation of wind speed without an instrument it’s now used as a basic scale to indicate the wind
Beaufort Wind Scale
Beaufort Force Number
Mean Wind speed (Mph)
Limits (MPH)
Descrip- tion
Effects
0
0
0
Calm
Smoke Rises Vertically
1
2
1 - 3
Light Air
Smoke Drift indicating direction
2
5
4 - 7
Light Breeze
Wind Felt on Face, Leaves Rustle
3
10
8 - 12
Gentle Breeze
Leaves, Small twigs in constant motion
4
15
13 - 18
Moderate Breeze
Dust and Leaves Raised up, Branches move
5
21
19 - 24
Fresh Breeze
Small Trees begin to sway
6
28
24 - 31
Strong Breeze
Large Branches of Trees in Motion
7
35
32 - 38
Moderate Gale
Whole Trees in motion, resistance felt to walking against the wind
8
42
39 - 46
Fresh Gale
Twigs and small branches break from Tree
9
50
47 - 54
Strong Gale
Large branches break from tree
10
59
55 - 63
Whole Gale
Trees broken and uprooted
11
68
64 - 72
Storm
Widespread damage
12
78
73 - 82
Hurricane
Violence and Destruction
13
88
83 - 92