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Beaufort Wind Speed Scale
See also Wind Chill
The Beaufort wind scale describes the strength of wind. You can use the descriptions below to estimate the wind speed.
| Scale |
Description |
Observable Effects |
Wind Speed (kph) |
| 0 |
calm |
smoke rises vertically |
1.6 |
| 1 |
light air |
smoke drifts slightly |
1.6-5 |
| 2 |
light breeze |
leaves rustle gently |
6-11 |
| 3 |
gentle breeze |
leaves and small twigs move |
13-20 |
| 4 |
moderate breeze |
small branches move, paper blown around |
20-30 |
| 5 |
fresh breeze |
smaller trees sway |
30-40 |
| 6 |
strong breeze |
large branches sway |
40-50 |
| 7 |
moderate gale |
trees start to sway |
50-60 |
| 8 |
fresh gale |
twigs/small branches broken, walking difficult |
60-75 |
| 9 |
strong gale |
loose exterior fixtures damaged |
75-85 |
| 10 |
whole gale |
trees blown down, significant damage |
85-100 |
| 11 |
storm |
much damage |
100-120 |
| 12 |
hurricane |
major natural disaster |
120+ |
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