The Beaufort Wind Scale
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The
Beaufort Wind Scale was originally devised by Sir Francis Beaufort to
describe wind speed in chart form. By watching the effect wind has on objects
in the outdoors, it is possible to estimate its speed. |
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# |
Title |
Wind Effect |
MPH |
|
0 |
Calm |
Smoke
rises vertically |
Less than
1 |
|
1 |
Light Air |
Smoke
drifts |
1 - 3 |
|
2 |
Light
Breeze |
Leaves
rustle |
4 - 7 |
|
3 |
Gentle
Breeze |
Flags fly |
8 - 12 |
|
4 |
Moderate
Breeze |
Dust,
loose paper raised |
13 - 18 |
|
5 |
Fresh
Breeze |
Small
trees sway |
19 - 24 |
|
6 |
Strong
Breeze |
Difficult
to use umbrellas |
25 - 31 |
|
7 |
Moderate
Gale |
Difficult
to walk |
32 - 38 |
|
8 |
Fresh
Gale |
Twigs
break off trees |
39 - 46 |
|
9 |
Strong
Gale |
Slight
damage to roofs |
47 - 54 |
|
10 |
Whole
Gale |
Trees
uprooted |
55 - 63 |
|
11 |
Storm |
Widespread
damage |
64 - 75 |
|
12 |
Hurricane |
Devastation |
Above 75 |